United Airlines flights from Washington Dulles (IAD) to Seattle-Tacoma (SEA).

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FLIGHT SCHEDULE
Direct Flights:
Daily 17:35 Washington Dulles (IAD) 20:10 Seattle-Tacoma (SEA) United Airlines UA 326 Non-stop Boeing 737-900 (739) 5:35 Effective from 2026-05-21
Daily 17:55 Washington Dulles (IAD) 20:57 Seattle-Tacoma (SEA) United Airlines UA 326 Non-stop Boeing 737 MAX 9 (7M9) 6:02 Valid until 2026-01-05
Daily 17:55 Washington Dulles (IAD) 20:56 Seattle-Tacoma (SEA) United Airlines UA 326 Non-stop Boeing 737 MAX 8 (7M8) 6:01 Effective 2026-02-12 through 2026-03-04
Daily 17:55 Washington Dulles (IAD) 20:52 Seattle-Tacoma (SEA) United Airlines UA 326 Non-stop Boeing 737 MAX 9 (7M9) 5:57 Effective 2026-03-29 through 2026-05-20
Daily 22:10 Washington Dulles (IAD) 00:45 Seattle-Tacoma (SEA) United Airlines UA 653 Non-stop Boeing 737-900 (739) 5:35 Effective 2026-05-21 through 2026-08-17 The flight arrives 1 day after departure.
Daily 12:37 Washington Dulles (IAD) 15:18 Seattle-Tacoma (SEA) United Airlines UA 788 Non-stop Boeing 737-900 (739) 5:41 Effective 2026-04-30 through 2026-05-20
Daily 13:00 Washington Dulles (IAD) 15:35 Seattle-Tacoma (SEA) United Airlines UA 788 Non-stop Boeing 737-900 (739) 5:35 Effective 2026-05-21 through 2026-10-24
Daily 17:55 Washington Dulles (IAD) 20:57 Seattle-Tacoma (SEA) United Airlines UA 1159 Non-stop Boeing 737-900 (739) 6:02 Effective 2026-01-06 through 2026-02-11
Mon-Thu 17:55 Washington Dulles (IAD) 20:56 Seattle-Tacoma (SEA) United Airlines UA 1303 Non-stop Boeing 737 MAX 8 (7M8) 6:01 Effective 2026-03-05 through 2026-03-26
Fri,Sat 17:55 Washington Dulles (IAD) 20:56 Seattle-Tacoma (SEA) United Airlines UA 1303 Non-stop Boeing 737-800 (738) 6:01 Effective 2026-03-06 through 2026-03-28
Sun 17:55 Washington Dulles (IAD) 20:56 Seattle-Tacoma (SEA) United Airlines UA 1303 Non-stop Boeing 737-900 (739) 6:01 Effective 2026-03-08 through 2026-03-22
Mon-Fri,Sun 08:26 Washington Dulles (IAD) 11:27 Seattle-Tacoma (SEA) United Airlines UA 1366 Non-stop Boeing 737 MAX 8 (7M8) 6:01 Valid until 2026-01-05
Sat 08:26 Washington Dulles (IAD) 11:27 Seattle-Tacoma (SEA) United Airlines UA 1366 Non-stop Boeing 737-800 (738) 6:01 Valid until 2026-01-03
Daily 08:40 Washington Dulles (IAD) 11:15 Seattle-Tacoma (SEA) United Airlines UA 2101 Non-stop Boeing 737-900 (739) 5:35 Effective 2026-05-21 through 2026-08-17
Daily 09:00 Washington Dulles (IAD) 11:47 Seattle-Tacoma (SEA) United Airlines UA 2101 Non-stop Boeing 737 MAX 8 (7M8) 5:47 Effective 2026-04-30 through 2026-05-20
Non-Direct Flights:
Daily 15:35 Washington Dulles (IAD) 22:18 Seattle-Tacoma (SEA) United Airlines UA 684 1-stop Boeing 737-900 (739) 9:43 Effective 2026-05-21 through 2026-08-17
Daily 08:15 Washington Dulles (IAD) 13:14 Seattle-Tacoma (SEA) United Airlines UA 1424 1-stop Airbus A321neo (32Q) 7:59 Effective 2026-03-29 through 2026-04-29
Daily 08:15 Washington Dulles (IAD) 13:20 Seattle-Tacoma (SEA) United Airlines UA 1424 1-stop Boeing 757-300 (753) 8:05 Effective 2026-04-30 through 2026-05-20
Daily 08:15 Washington Dulles (IAD) 13:20 Seattle-Tacoma (SEA) United Airlines UA 1424 1-stop Boeing 737-900 (739) 8:05 Effective from 2026-05-21
Daily 12:35 Washington Dulles (IAD) 20:58 Seattle-Tacoma (SEA) United Airlines UA 1434 1-stop Boeing 737-900 (739) 11:23 Effective 2026-03-05 through 2026-03-28
Mon,Thu,Fri,Sun 17:17 Washington Dulles (IAD) 22:43 Seattle-Tacoma (SEA) United Airlines UA 2497 1-stop Boeing 737-900 (739) 8:26 Effective 2026-01-08 through 2026-02-09
Mon-Fri 08:00 Washington Dulles (IAD) 19:25 Seattle-Tacoma (SEA) United Airlines UA 683 2-stop Boeing 737-900 (739) 14:25 Effective 2026-03-05 through 2026-03-27

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Parallax here IAD-SEA

A domestic route departing from the Washington Dulles airport (IAD) and arriving at Seattle-Tacoma airport (SEA).
The flight distance is 2299 miles, or 3699 km.
The timezone of the departure airport is UTC-5 , and the timezone of the arrival airport is UTC-8 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 5:35 and 6:02.

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United Airlines flights from Washington Dulles (IAD) to Seattle-Tacoma (SEA).

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FLIGHT SCHEDULE

Direct Flights:

United Airlines UA326

17:35

Washington Dulles (IAD)

20:10

Seattle-Tacoma (SEA)

Effective from 2026-05-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA326

17:55

Washington Dulles (IAD)

20:57

Seattle-Tacoma (SEA)

Valid until 2026-01-05

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:02, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

United Airlines UA326

17:55

Washington Dulles (IAD)

20:56

Seattle-Tacoma (SEA)

Effective 2026-02-12 through 2026-03-04

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:01, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA326

17:55

Washington Dulles (IAD)

20:52

Seattle-Tacoma (SEA)

Effective 2026-03-29 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:57, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

United Airlines UA653

22:10

Washington Dulles (IAD)

00:45(+1)

Seattle-Tacoma (SEA)

Effective 2026-05-21 through 2026-08-17

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:35, non-stop
Boeing 737-900 (739)
The flight arrives 1 day after departure.

Direct Flights:

United Airlines UA788

12:37

Washington Dulles (IAD)

15:18

Seattle-Tacoma (SEA)

Effective 2026-04-30 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:41, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA788

13:00

Washington Dulles (IAD)

15:35

Seattle-Tacoma (SEA)

Effective 2026-05-21 through 2026-10-24

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA1159

17:55

Washington Dulles (IAD)

20:57

Seattle-Tacoma (SEA)

Effective 2026-01-06 through 2026-02-11

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:02, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA1303

17:55

Washington Dulles (IAD)

20:56

Seattle-Tacoma (SEA)

Effective 2026-03-05 through 2026-03-26

Mon

Tue

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 6:01, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA1303

17:55

Washington Dulles (IAD)

20:56

Seattle-Tacoma (SEA)

Effective 2026-03-06 through 2026-03-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Duration: 6:01, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1303

17:55

Washington Dulles (IAD)

20:56

Seattle-Tacoma (SEA)

Effective 2026-03-08 through 2026-03-22

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 6:01, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA1366

08:26

Washington Dulles (IAD)

11:27

Seattle-Tacoma (SEA)

Valid until 2026-01-05

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun

Duration: 6:01, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA1366

08:26

Washington Dulles (IAD)

11:27

Seattle-Tacoma (SEA)

Valid until 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 6:01, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA2101

08:40

Washington Dulles (IAD)

11:15

Seattle-Tacoma (SEA)

Effective 2026-05-21 through 2026-08-17

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2101

09:00

Washington Dulles (IAD)

11:47

Seattle-Tacoma (SEA)

Effective 2026-04-30 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:47, non-stop
Boeing 737 MAX 8 (7M8)

Non-Direct Flights:

United Airlines UA684

15:35

Washington Dulles (IAD)

22:18

Seattle-Tacoma (SEA)

Effective 2026-05-21 through 2026-08-17

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 9:43, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1424

08:15

Washington Dulles (IAD)

13:14

Seattle-Tacoma (SEA)

Effective 2026-03-29 through 2026-04-29

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 7:59, 1-stop
Airbus A321neo (32Q)

Non-Direct Flights:

United Airlines UA1424

08:15

Washington Dulles (IAD)

13:20

Seattle-Tacoma (SEA)

Effective 2026-04-30 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 8:05, 1-stop
Boeing 757-300 (753)

Non-Direct Flights:

United Airlines UA1424

08:15

Washington Dulles (IAD)

13:20

Seattle-Tacoma (SEA)

Effective from 2026-05-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 8:05, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1434

12:35

Washington Dulles (IAD)

20:58

Seattle-Tacoma (SEA)

Effective 2026-03-05 through 2026-03-28

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 11:23, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA2497

17:17

Washington Dulles (IAD)

22:43

Seattle-Tacoma (SEA)

Effective 2026-01-08 through 2026-02-09

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 8:26, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA683

08:00

Washington Dulles (IAD)

19:25

Seattle-Tacoma (SEA)

Effective 2026-03-05 through 2026-03-27

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 14:25, 2-stop
Boeing 737-900 (739)

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Parallax here IAD-SEA

A domestic route departing from the Washington Dulles airport (IAD) and arriving at Seattle-Tacoma airport (SEA).
The flight distance is 2299 miles, or 3699 km.
The timezone of the departure airport is UTC-5 , and the timezone of the arrival airport is UTC-8 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 5:35 and 6:02.

All IAD-SEA flights

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