All airlines flying 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 06:30 Washington Dulles (IAD) 09:10 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 5:40 Effective 2026-05-13 through 2026-06-09
Daily 06:30 Washington Dulles (IAD) 09:19 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 5:49 Effective from 2026-06-10
Wed 07:00 Washington Dulles (IAD) 09:45 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 5:45 Operates only on 2026-03-18
Daily 07:00 Washington Dulles (IAD) 09:54 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 5:54 Effective 2026-03-19 through 2026-05-12
Mon,Tue,Fri-Sun 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 MAX 9 (7M9) 6:00 Effective 2026-02-13 through 2026-02-28
Wed 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737-800 (73H) 6:00 Operates only on 2026-02-18
Wed,Thu 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 6:00 Effective 2026-02-19 through 2026-02-26
Tue-Thu,Sun 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 6:00 Effective 2026-03-01 through 2026-03-08
Mon,Fri,Sat 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 MAX 9 (7M9) 6:00 Effective 2026-03-02 through 2026-03-07
Mon,Tue,Fri,Sat 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 MAX 9 (7M9) 6:00 Effective 2026-03-09 through 2026-03-17
Wed,Thu,Sun 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 6:00 Effective 2026-03-11 through 2026-03-15
Daily 07:33 Washington Dulles (IAD) 10:20 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 MAX 9 (7M9) 5:47 Valid until 2026-01-04
Mon,Tue 07:33 Washington Dulles (IAD) 10:20 Seattle-Tacoma (SEA) Alaska Airlines AS 351 Non-stop Boeing 737 (73J) 5:47 Effective 2026-01-05 through 2026-01-06
Daily 09:00 Washington Dulles (IAD) 11:39 Seattle-Tacoma (SEA) Alaska Airlines AS 375 Non-stop Boeing 737 (73J) 5:39 Effective 2026-05-13 through 2026-06-09
Daily 09:00 Washington Dulles (IAD) 11:50 Seattle-Tacoma (SEA) Alaska Airlines AS 375 Non-stop Boeing 737 (73J) 5:50 Effective from 2026-06-10
Daily 10:00 Washington Dulles (IAD) 12:54 Seattle-Tacoma (SEA) Alaska Airlines AS 375 Non-stop Boeing 737 (73J) 5:54 Effective 2026-04-22 through 2026-05-12
Wed 18:04 Washington Dulles (IAD) 21:08 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 MAX 8 (7M8) 6:04 Operates only on 2026-01-07
Daily 18:04 Washington Dulles (IAD) 21:08 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 MAX 9 (7M9) 6:04 Effective 2026-01-08 through 2026-02-11
Mon,Thu,Sun 18:27 Washington Dulles (IAD) 21:35 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 (73J) 6:08 Effective 2026-02-12 through 2026-02-19
Fri 18:27 Washington Dulles (IAD) 21:35 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 MAX 9 (7M9) 6:08 Operates only on 2026-02-13
Mon,Thu,Fri,Sun 18:27 Washington Dulles (IAD) 21:35 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 (73J) 6:08 Effective 2026-02-20 through 2026-03-16
Wed 18:55 Washington Dulles (IAD) 21:40 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 (73J) 5:45 Operates only on 2026-03-18
Daily 19:01 Washington Dulles (IAD) 22:00 Seattle-Tacoma (SEA) Alaska Airlines AS 406 Non-stop Boeing 737 (73J) 5:59 Effective 2026-03-19 through 2026-04-21
Mon,Thu 18:43 Washington Dulles (IAD) 21:32 Seattle-Tacoma (SEA) Alaska Airlines AS 409 Non-stop Boeing 737 MAX 9 (7M9) 5:49 Valid until 2026-01-05
Tue,Fri-Sun 18:43 Washington Dulles (IAD) 21:32 Seattle-Tacoma (SEA) Alaska Airlines AS 409 Non-stop Boeing 737 (73J) 5:49 Valid until 2026-01-06
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 19:01 Washington Dulles (IAD) 22:00 Seattle-Tacoma (SEA) Alaska Airlines AS 737 Non-stop Boeing 737 (73J) 5:59 Effective 2026-04-22 through 2026-05-12
Daily 19:15 Washington Dulles (IAD) 22:00 Seattle-Tacoma (SEA) Alaska Airlines AS 737 Non-stop Boeing 737 (73J) 5:45 Effective 2026-05-13 through 2026-06-09
Daily 19:18 Washington Dulles (IAD) 22:06 Seattle-Tacoma (SEA) Alaska Airlines AS 737 Non-stop Boeing 737 (73J) 5:48 Effective from 2026-06-10
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 07:00 Washington Dulles (IAD) 10:01 Seattle-Tacoma (SEA) Delta Air Lines DL 1015 Non-stop Airbus A220-300 (223) 6:01 Effective 2026-03-08 through 2026-03-14
Daily 07:00 Washington Dulles (IAD) 10:03 Seattle-Tacoma (SEA) Delta Air Lines DL 1015 Non-stop Airbus A220-300 (223) 6:03 Effective 2026-03-15 through 2026-04-12
Daily 07:05 Washington Dulles (IAD) 10:05 Seattle-Tacoma (SEA) Delta Air Lines DL 1015 Non-stop Airbus A220-300 (223) 6:00 Effective from 2026-10-06
Daily 07:10 Washington Dulles (IAD) 10:03 Seattle-Tacoma (SEA) Delta Air Lines DL 1015 Non-stop Airbus A220-300 (223) 5:53 Effective 2026-04-13 through 2026-10-05
Daily 07:30 Washington Dulles (IAD) 10:29 Seattle-Tacoma (SEA) Delta Air Lines DL 1015 Non-stop Airbus A220-300 (223) 5:59 Effective 2026-01-05 through 2026-03-07
Mon,Tue,Fri-Sun 07:05 Washington Dulles (IAD) 10:02 Seattle-Tacoma (SEA) Delta Air Lines DL 1084 Non-stop Airbus A220-300 (223) 5:57 Valid until 2026-01-04
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

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Parallax here IAD-SEA

1 2 3 4 5 6

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 6:08.

Return (SEA-IAD) flights

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All airlines flying 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:

Alaska Airlines AS351

06:30

Washington Dulles (IAD)

09:10

Seattle-Tacoma (SEA)

Effective 2026-05-13 through 2026-06-09

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:40, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

06:30

Washington Dulles (IAD)

09:19

Seattle-Tacoma (SEA)

Effective from 2026-06-10

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:49, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

07:00

Washington Dulles (IAD)

09:45

Seattle-Tacoma (SEA)

Operates only on 2026-03-18

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 5:45, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

07:00

Washington Dulles (IAD)

09:54

Seattle-Tacoma (SEA)

Effective 2026-03-19 through 2026-05-12

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:54, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Effective 2026-02-13 through 2026-02-28

Mon

Tue

Wed
-

Thu
-

Fri

Sat

Sun

Duration: 6:00, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Operates only on 2026-02-18

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 6:00, non-stop
Boeing 737-800 (73H)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Effective 2026-02-19 through 2026-02-26

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 6:00, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Effective 2026-03-01 through 2026-03-08

Mon
-

Tue

Wed

Thu

Fri
-

Sat
-

Sun

Duration: 6:00, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

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

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Duration: 6:00, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Effective 2026-03-09 through 2026-03-17

Mon

Tue

Wed
-

Thu
-

Fri

Sat

Sun
-

Duration: 6:00, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS351

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Effective 2026-03-11 through 2026-03-15

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun

Duration: 6:00, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS351

07:33

Washington Dulles (IAD)

10:20

Seattle-Tacoma (SEA)

Valid until 2026-01-04

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:47, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS351

07:33

Washington Dulles (IAD)

10:20

Seattle-Tacoma (SEA)

Effective 2026-01-05 through 2026-01-06

Mon

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 5:47, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS375

09:00

Washington Dulles (IAD)

11:39

Seattle-Tacoma (SEA)

Effective 2026-05-13 through 2026-06-09

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:39, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS375

09:00

Washington Dulles (IAD)

11:50

Seattle-Tacoma (SEA)

Effective from 2026-06-10

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:50, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS375

10:00

Washington Dulles (IAD)

12:54

Seattle-Tacoma (SEA)

Effective 2026-04-22 through 2026-05-12

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:54, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS406

18:04

Washington Dulles (IAD)

21:08

Seattle-Tacoma (SEA)

Operates only on 2026-01-07

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 6:04, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Alaska Airlines AS406

18:04

Washington Dulles (IAD)

21:08

Seattle-Tacoma (SEA)

Effective 2026-01-08 through 2026-02-11

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:04, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS406

18:27

Washington Dulles (IAD)

21:35

Seattle-Tacoma (SEA)

Effective 2026-02-12 through 2026-02-19

Mon

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun

Duration: 6:08, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS406

18:27

Washington Dulles (IAD)

21:35

Seattle-Tacoma (SEA)

Operates only on 2026-02-13

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 6:08, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS406

18:27

Washington Dulles (IAD)

21:35

Seattle-Tacoma (SEA)

Effective 2026-02-20 through 2026-03-16

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 6:08, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS406

18:55

Washington Dulles (IAD)

21:40

Seattle-Tacoma (SEA)

Operates only on 2026-03-18

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 5:45, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS406

19:01

Washington Dulles (IAD)

22:00

Seattle-Tacoma (SEA)

Effective 2026-03-19 through 2026-04-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:59, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS409

18:43

Washington Dulles (IAD)

21:32

Seattle-Tacoma (SEA)

Valid until 2026-01-05

Mon

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 5:49, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS409

18:43

Washington Dulles (IAD)

21:32

Seattle-Tacoma (SEA)

Valid until 2026-01-06

Mon
-

Tue

Wed
-

Thu
-

Fri

Sat

Sun

Duration: 5:49, non-stop
Boeing 737 (73J)

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:

Alaska Airlines AS737

19:01

Washington Dulles (IAD)

22:00

Seattle-Tacoma (SEA)

Effective 2026-04-22 through 2026-05-12

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:59, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS737

19:15

Washington Dulles (IAD)

22:00

Seattle-Tacoma (SEA)

Effective 2026-05-13 through 2026-06-09

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:45, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS737

19:18

Washington Dulles (IAD)

22:06

Seattle-Tacoma (SEA)

Effective from 2026-06-10

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:48, non-stop
Boeing 737 (73J)

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:

Delta Air Lines DL1015

07:00

Washington Dulles (IAD)

10:01

Seattle-Tacoma (SEA)

Effective 2026-03-08 through 2026-03-14

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:01, non-stop
Airbus A220-300 (223)

Direct Flights:

Delta Air Lines DL1015

07:00

Washington Dulles (IAD)

10:03

Seattle-Tacoma (SEA)

Effective 2026-03-15 through 2026-04-12

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:03, non-stop
Airbus A220-300 (223)

Direct Flights:

Delta Air Lines DL1015

07:05

Washington Dulles (IAD)

10:05

Seattle-Tacoma (SEA)

Effective from 2026-10-06

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:00, non-stop
Airbus A220-300 (223)

Direct Flights:

Delta Air Lines DL1015

07:10

Washington Dulles (IAD)

10:03

Seattle-Tacoma (SEA)

Effective 2026-04-13 through 2026-10-05

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:53, non-stop
Airbus A220-300 (223)

Direct Flights:

Delta Air Lines DL1015

07:30

Washington Dulles (IAD)

10:29

Seattle-Tacoma (SEA)

Effective 2026-01-05 through 2026-03-07

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:59, non-stop
Airbus A220-300 (223)

Direct Flights:

Delta Air Lines DL1084

07:05

Washington Dulles (IAD)

10:02

Seattle-Tacoma (SEA)

Valid until 2026-01-04

Mon

Tue

Wed
-

Thu
-

Fri

Sat

Sun

Duration: 5:57, non-stop
Airbus A220-300 (223)

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)

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Parallax here IAD-SEA

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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 6:08.

Return (SEA-IAD) flights

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