WestJet flights from Ontario, Los Angeles (ONT) to Seattle-Tacoma (SEA).

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FLIGHT SCHEDULE
Direct Codeshare Flights:
Tue 07:30 Ontario, Los Angeles (ONT) 2 10:36 Seattle-Tacoma (SEA) WestJet WS 5418 Non-stop Embraer EMB 175 (E7W) 3:06 Effective 2026-01-20 through 2026-02-10 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5486 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-15 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5488 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-22 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5547 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-08 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5547 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-29 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5556 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-01 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5569 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-25 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5571 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-04 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Wed 07:30 Ontario, Los Angeles (ONT) 2 10:36 Seattle-Tacoma (SEA) WestJet WS 5576 Non-stop Embraer EMB 175 (E7W) 3:06 Effective 2026-01-21 through 2026-02-11 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Sat 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 5576 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-11 through 2026-07-18 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Tue,Thu 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6313 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-08-11 through 2026-08-27 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6555 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-10 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Tue,Thu 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6556 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-06-30 through 2026-07-02 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6559 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-06-29 through 2026-07-06 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6559 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-08-17 through 2026-08-24 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Tue,Thu 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6579 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-08-04 through 2026-08-06 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Tue,Thu 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6626 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-07 through 2026-07-30 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Wed,Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6628 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-01 through 2026-07-05 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6628 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-27 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6648 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-06-28 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6665 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-13 through 2026-07-20 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6665 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-08-03 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Wed 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6710 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-08 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Wed 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6860 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-22 through 2026-07-29 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon,Fri-Sun 06:00 Ontario, Los Angeles (ONT) 2 08:55 Seattle-Tacoma (SEA) WestJet WS 6921 Non-stop Embraer EMB 175 (E7W) 2:55 Effective 2026-03-08 through 2026-04-12 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Mon,Fri-Sun 06:38 Ontario, Los Angeles (ONT) 2 09:45 Seattle-Tacoma (SEA) WestJet WS 6921 Non-stop Embraer EMB 175 (E7W) 3:07 Valid until 2026-01-04 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Daily 07:30 Ontario, Los Angeles (ONT) 2 10:36 Seattle-Tacoma (SEA) WestJet WS 6921 Non-stop Embraer EMB 175 (E7W) 3:06 Effective 2026-01-05 through 2026-01-19 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Mon,Thu-Sun 07:30 Ontario, Los Angeles (ONT) 2 10:36 Seattle-Tacoma (SEA) WestJet WS 6921 Non-stop Embraer EMB 175 (E7W) 3:06 Effective 2026-01-22 through 2026-02-09 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Daily 07:30 Ontario, Los Angeles (ONT) 2 10:34 Seattle-Tacoma (SEA) WestJet WS 6921 Non-stop Embraer EMB 175 (E7W) 3:04 Effective 2026-02-12 through 2026-03-07 Codeshare flight, operated by Delta Air Lines.(DL 4042)
Wed 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6933 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-15 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6961 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-26 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Wed 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 6993 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-08-05 through 2026-08-26 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Fri,Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 7013 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-08-14 through 2026-08-28 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Fri,Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 7092 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-08-07 through 2026-08-09 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Fri,Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 7110 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-31 through 2026-08-02 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Fri 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 7174 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-03 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Fri,Sun 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 7179 Non-stop Embraer EMB 175 (E7W) 3:00 Effective 2026-07-10 through 2026-07-19 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Fri 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA) WestJet WS 7250 Non-stop Embraer EMB 175 (E7W) 3:00 Operates only on 2026-07-24 Codeshare flight, operated by Delta Air Lines.(DL 3819)
Mon,Fri-Sun 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA) WestJet WS 7523 Non-stop Airbus A220-300 (223) 3:01 Effective 2026-04-13 through 2026-04-25 Codeshare flight, operated by Delta Air Lines.(DL 1071)
Mon,Tue,Thu,Sat 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA) WestJet WS 7523 Non-stop Airbus A220-300 (223) 3:01 Effective 2026-04-27 through 2026-05-05 Codeshare flight, operated by Delta Air Lines.(DL 1071)
Mon,Tue,Thu,Sat 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA) WestJet WS 7523 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-05-07 through 2026-05-14 Codeshare flight, operated by Delta Air Lines.(DL 3816)
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA) WestJet WS 7523 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-05-15 through 2026-10-05 Codeshare flight, operated by Delta Air Lines.(DL 3816)
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:05 Seattle-Tacoma (SEA) WestJet WS 7523 Non-stop Embraer EMB 175 (E7W) 3:05 Effective 2026-10-06 through 2026-10-26 Codeshare flight, operated by Delta Air Lines.(DL 3816)
Mon,Fri-Sun 07:00 Ontario, Los Angeles (ONT) 2 10:05 Seattle-Tacoma (SEA) WestJet WS 7523 Non-stop Embraer EMB 175 (E7W) 3:05 Effective from 2026-10-30 Codeshare flight, operated by Delta Air Lines.(DL 3816)
Wed,Fri,Sun 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA) WestJet WS 7819 Non-stop Airbus A220-300 (223) 3:01 Effective 2026-04-26 through 2026-05-06 Codeshare flight, operated by Delta Air Lines.(DL 1071)
Wed,Fri,Sun 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA) WestJet WS 7819 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-05-08 through 2026-05-13 Codeshare flight, operated by Delta Air Lines.(DL 3816)
Sat 11:42 Ontario, Los Angeles (ONT) 2 14:45 Seattle-Tacoma (SEA) WestJet WS 8396 Non-stop Embraer EMB 175 (E7W) 3:03 Valid until 2026-01-03 Codeshare flight, operated by Delta Air Lines.(DL 4070)
Mon,Fri-Sun 11:55 Ontario, Los Angeles (ONT) 2 14:56 Seattle-Tacoma (SEA) WestJet WS 8396 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-04-26 through 2026-10-05 Codeshare flight, operated by Delta Air Lines.(DL 4070)
Mon,Fri-Sun 11:55 Ontario, Los Angeles (ONT) 2 14:58 Seattle-Tacoma (SEA) WestJet WS 8396 Non-stop Embraer EMB 175 (E7W) 3:03 Effective 2026-10-09 through 2026-10-24 Codeshare flight, operated by Delta Air Lines.(DL 4070)

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Parallax here ONT-SEA

A domestic route departing from the Ontario, Los Angeles airport (ONT) and arriving at Seattle-Tacoma airport (SEA).
The flight distance is 956 miles, or 1539 km.
The timezone of both the departure and the arrival airports is UTC-8 . Current time at both airports is (loading...).
For direct flights, the flight time varies between 2:55 and 3:07.

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WestJet flights from Ontario, Los Angeles (ONT) to Seattle-Tacoma (SEA).

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FLIGHT SCHEDULE

Direct Codeshare Flights:

WestJet WS5418

07:30

Ontario, Los Angeles (ONT) 2

10:36

Seattle-Tacoma (SEA)

Effective 2026-01-20 through 2026-02-10

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 3:06, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5486

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5488

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-22

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5547

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-08

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5547

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-29

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5556

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5569

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-25

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5571

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-04

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5576

07:30

Ontario, Los Angeles (ONT) 2

10:36

Seattle-Tacoma (SEA)

Effective 2026-01-21 through 2026-02-11

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 3:06, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS5576

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-11 through 2026-07-18

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6313

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-08-11 through 2026-08-27

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6555

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-10

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6556

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-06-30 through 2026-07-02

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6559

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-06-29 through 2026-07-06

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6559

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-08-17 through 2026-08-24

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6579

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-08-04 through 2026-08-06

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6626

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-07 through 2026-07-30

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6628

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-01 through 2026-07-05

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6628

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-27

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6648

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-06-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6665

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-13 through 2026-07-20

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6665

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-08-03

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6710

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-08

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6860

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-22 through 2026-07-29

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6921

06:00

Ontario, Los Angeles (ONT) 2

08:55

Seattle-Tacoma (SEA)

Effective 2026-03-08 through 2026-04-12

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 2:55, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6921

06:38

Ontario, Los Angeles (ONT) 2

09:45

Seattle-Tacoma (SEA)

Valid until 2026-01-04

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 3:07, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6921

07:30

Ontario, Los Angeles (ONT) 2

10:36

Seattle-Tacoma (SEA)

Effective 2026-01-05 through 2026-01-19

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 3:06, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6921

07:30

Ontario, Los Angeles (ONT) 2

10:36

Seattle-Tacoma (SEA)

Effective 2026-01-22 through 2026-02-09

Mon

Tue
-

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 3:06, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6921

07:30

Ontario, Los Angeles (ONT) 2

10:34

Seattle-Tacoma (SEA)

Effective 2026-02-12 through 2026-03-07

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4042)

Duration: 3:04, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6933

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-15

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6961

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-26

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS6993

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-08-05 through 2026-08-26

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7013

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-08-14 through 2026-08-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7092

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-08-07 through 2026-08-09

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7110

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-31 through 2026-08-02

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7174

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7179

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Effective 2026-07-10 through 2026-07-19

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7250

14:00

Ontario, Los Angeles (ONT) 2

17:00

Seattle-Tacoma (SEA)

Operates only on 2026-07-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3819)

Duration: 3:00, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7523

07:00

Ontario, Los Angeles (ONT) 2

10:01

Seattle-Tacoma (SEA)

Effective 2026-04-13 through 2026-04-25

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 1071)

Duration: 3:01, non-stop
Airbus A220-300 (223)

Direct Codeshare Flights:

WestJet WS7523

07:00

Ontario, Los Angeles (ONT) 2

10:01

Seattle-Tacoma (SEA)

Effective 2026-04-27 through 2026-05-05

Mon

Tue

Wed
-

Thu

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 1071)

Duration: 3:01, non-stop
Airbus A220-300 (223)

Direct Codeshare Flights:

WestJet WS7523

07:00

Ontario, Los Angeles (ONT) 2

10:01

Seattle-Tacoma (SEA)

Effective 2026-05-07 through 2026-05-14

Mon

Tue

Wed
-

Thu

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 3816)

Duration: 3:01, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7523

07:00

Ontario, Los Angeles (ONT) 2

10:01

Seattle-Tacoma (SEA)

Effective 2026-05-15 through 2026-10-05

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3816)

Duration: 3:01, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7523

07:00

Ontario, Los Angeles (ONT) 2

10:05

Seattle-Tacoma (SEA)

Effective 2026-10-06 through 2026-10-26

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3816)

Duration: 3:05, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7523

07:00

Ontario, Los Angeles (ONT) 2

10:05

Seattle-Tacoma (SEA)

Effective from 2026-10-30

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3816)

Duration: 3:05, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS7819

07:00

Ontario, Los Angeles (ONT) 2

10:01

Seattle-Tacoma (SEA)

Effective 2026-04-26 through 2026-05-06

Mon
-

Tue
-

Wed

Thu
-

Fri

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 1071)

Duration: 3:01, non-stop
Airbus A220-300 (223)

Direct Codeshare Flights:

WestJet WS7819

07:00

Ontario, Los Angeles (ONT) 2

10:01

Seattle-Tacoma (SEA)

Effective 2026-05-08 through 2026-05-13

Mon
-

Tue
-

Wed

Thu
-

Fri

Sat
-

Sun

Codeshare flight, operated by Delta Air Lines. (DL 3816)

Duration: 3:01, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS8396

11:42

Ontario, Los Angeles (ONT) 2

14:45

Seattle-Tacoma (SEA)

Valid until 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by Delta Air Lines. (DL 4070)

Duration: 3:03, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS8396

11:55

Ontario, Los Angeles (ONT) 2

14:56

Seattle-Tacoma (SEA)

Effective 2026-04-26 through 2026-10-05

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4070)

Duration: 3:01, non-stop
Embraer EMB 175 (E7W)

Direct Codeshare Flights:

WestJet WS8396

11:55

Ontario, Los Angeles (ONT) 2

14:58

Seattle-Tacoma (SEA)

Effective 2026-10-09 through 2026-10-24

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun

Codeshare flight, operated by Delta Air Lines. (DL 4070)

Duration: 3:03, non-stop
Embraer EMB 175 (E7W)

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Parallax here ONT-SEA

A domestic route departing from the Ontario, Los Angeles airport (ONT) and arriving at Seattle-Tacoma airport (SEA).
The flight distance is 956 miles, or 1539 km.
The timezone of both the departure and the arrival airports is UTC-8 . Current time at both airports is (loading...).
For direct flights, the flight time varies between 2:55 and 3:07.

All ONT-SEA flights

All WestJet flights

Return (SEA-ONT) flights

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