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

FLIGHT SCHEDULE
Direct Flights:
Daily 23:00 Seattle-Tacoma (SEA) 07:08 Washington Dulles (IAD) United Airlines UA 264 Non-stop Boeing 737 MAX 9 (7M9) 5:08 Effective 2026-04-30 through 2026-05-20 The flight arrives 1 day after departure.
Daily 23:20 Seattle-Tacoma (SEA) 07:13 Washington Dulles (IAD) United Airlines UA 264 Non-stop Boeing 737-900 (739) 4:53 Effective 2026-05-21 through 2026-08-17 The flight arrives 1 day after departure.
Daily 22:10 Seattle-Tacoma (SEA) 06:03 Washington Dulles (IAD) United Airlines UA 1355 Non-stop Boeing 737-900 (739) 4:53 Effective 2026-05-21 through 2026-10-24 The flight arrives 1 day after departure.
Fri 23:39 Seattle-Tacoma (SEA) 07:35 Washington Dulles (IAD) United Airlines UA 1483 Non-stop Boeing 737-800 (738) 4:56 Valid until 2026-01-02 The flight arrives 1 day after departure.
Daily 08:00 Seattle-Tacoma (SEA) 16:11 Washington Dulles (IAD) United Airlines UA 1523 Non-stop Boeing 737 MAX 9 (7M9) 5:11 Effective 2026-03-29 through 2026-04-29
Daily 08:00 Seattle-Tacoma (SEA) 16:11 Washington Dulles (IAD) United Airlines UA 1523 Non-stop Boeing 737-900 (739) 5:11 Effective 2026-04-30 through 2026-05-20
Daily 08:00 Seattle-Tacoma (SEA) 15:53 Washington Dulles (IAD) United Airlines UA 1523 Non-stop Boeing 737-900 (739) 4:53 Effective from 2026-05-21
Daily 23:15 Seattle-Tacoma (SEA) 07:11 Washington Dulles (IAD) United Airlines UA 2019 Non-stop Boeing 737 MAX 9 (7M9) 4:56 Valid until 2026-01-05 The flight arrives 1 day after departure.
Daily 12:45 Seattle-Tacoma (SEA) 20:38 Washington Dulles (IAD) United Airlines UA 2131 Non-stop Boeing 737-900 (739) 4:53 Effective 2026-05-21 through 2026-08-17
Daily 13:10 Seattle-Tacoma (SEA) 21:18 Washington Dulles (IAD) United Airlines UA 2131 Non-stop Boeing 737 MAX 8 (7M8) 5:08 Effective 2026-04-30 through 2026-05-20
Thu 08:00 Seattle-Tacoma (SEA) 16:06 Washington Dulles (IAD) United Airlines UA 2217 Non-stop Boeing 737-800 (738) 5:06 Valid until 2026-01-01
Mon-Wed,Fri,Sun 08:00 Seattle-Tacoma (SEA) 16:06 Washington Dulles (IAD) United Airlines UA 2217 Non-stop Boeing 737 MAX 8 (7M8) 5:06 Valid until 2026-01-05
Daily 08:10 Seattle-Tacoma (SEA) 16:16 Washington Dulles (IAD) United Airlines UA 2217 Non-stop Boeing 737-900 (739) 5:06 Effective 2026-01-06 through 2026-02-03
Daily 08:10 Seattle-Tacoma (SEA) 16:16 Washington Dulles (IAD) United Airlines UA 2217 Non-stop Boeing 737-900 (739) 5:06 Effective 2026-02-05 through 2026-02-11
Daily 08:17 Seattle-Tacoma (SEA) 16:19 Washington Dulles (IAD) United Airlines UA 2217 Non-stop Boeing 737-900 (739) 5:02 Effective 2026-02-12 through 2026-03-04
Wed 08:20 Seattle-Tacoma (SEA) 16:26 Washington Dulles (IAD) United Airlines UA 2217 Non-stop Boeing 737-900 (739) 5:06 Operates only on 2026-02-04
Tue-Fri 08:00 Seattle-Tacoma (SEA) 16:02 Washington Dulles (IAD) United Airlines UA 2474 Non-stop Boeing 737 MAX 8 (7M8) 5:02 Effective 2026-03-05 through 2026-03-27
Sat,Sun 08:00 Seattle-Tacoma (SEA) 16:02 Washington Dulles (IAD) United Airlines UA 2474 Non-stop Boeing 737-800 (738) 5:02 Effective 2026-03-07 through 2026-03-28
Mon 08:00 Seattle-Tacoma (SEA) 16:02 Washington Dulles (IAD) United Airlines UA 2474 Non-stop Boeing 737-900 (739) 5:02 Effective 2026-03-09 through 2026-03-23
Non-Direct Flights:
Thu 12:12 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737 MAX 8 (7M8) 8:09 Operates only on 2026-02-12
Sun 12:12 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737-900 (739) 8:09 Operates only on 2026-02-15
Sun 12:18 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737-900 (739) 8:03 Effective 2026-02-22 through 2026-03-01
Fri 12:25 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737-900 (739) 7:56 Effective 2026-02-13 through 2026-02-27
Sat 12:42 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737-900 (739) 7:39 Effective 2026-02-14 through 2026-02-28
Mon-Thu 12:43 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737-900 (739) 7:38 Effective 2026-02-16 through 2026-02-26
Mon 12:43 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737 MAX 9 (7M9) 7:38 Operates only on 2026-03-02
Tue,Wed 12:43 Seattle-Tacoma (SEA) 23:21 Washington Dulles (IAD) United Airlines UA 1784 1-stop Boeing 737-900 (739) 7:38 Effective 2026-03-03 through 2026-03-04

A domestic route departing from the Seattle-Tacoma airport (SEA) and arriving at Washington Dulles airport (IAD).
The flight distance is 2299 miles, or 3699 km.
The timezone of the departure airport is UTC-8 , and the timezone of the arrival airport is UTC-5 . 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 4:53 and 5:11.

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FLIGHT SCHEDULE

Direct Flights:

United Airlines UA264

23:00

Seattle-Tacoma (SEA)

07:08(+1)

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:08, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

Direct Flights:

United Airlines UA264

23:20

Seattle-Tacoma (SEA)

07:13(+1)

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 4:53, non-stop
Boeing 737-900 (739)
The flight arrives 1 day after departure.

Direct Flights:

United Airlines UA1355

22:10

Seattle-Tacoma (SEA)

06:03(+1)

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 4:53, non-stop
Boeing 737-900 (739)
The flight arrives 1 day after departure.

Direct Flights:

United Airlines UA1483

23:39

Seattle-Tacoma (SEA)

07:35(+1)

Washington Dulles (IAD)

Valid until 2026-01-02

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 4:56, non-stop
Boeing 737-800 (738)
The flight arrives 1 day after departure.

Direct Flights:

United Airlines UA1523

08:00

Seattle-Tacoma (SEA)

16:11

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:11, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

United Airlines UA1523

08:00

Seattle-Tacoma (SEA)

16:11

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:11, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA1523

08:00

Seattle-Tacoma (SEA)

15:53

Washington Dulles (IAD)

Effective from 2026-05-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 4:53, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2019

23:15

Seattle-Tacoma (SEA)

07:11(+1)

Washington Dulles (IAD)

Valid until 2026-01-05

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 4:56, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

Direct Flights:

United Airlines UA2131

12:45

Seattle-Tacoma (SEA)

20:38

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 4:53, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2131

13:10

Seattle-Tacoma (SEA)

21:18

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:08, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA2217

08:00

Seattle-Tacoma (SEA)

16:06

Washington Dulles (IAD)

Valid until 2026-01-01

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 5:06, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA2217

08:00

Seattle-Tacoma (SEA)

16:06

Washington Dulles (IAD)

Valid until 2026-01-05

Mon

Tue

Wed

Thu
-

Fri

Sat
-

Sun

Duration: 5:06, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA2217

08:10

Seattle-Tacoma (SEA)

16:16

Washington Dulles (IAD)

Effective 2026-01-06 through 2026-02-03

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:06, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2217

08:10

Seattle-Tacoma (SEA)

16:16

Washington Dulles (IAD)

Effective 2026-02-05 through 2026-02-11

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:06, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2217

08:17

Seattle-Tacoma (SEA)

16:19

Washington Dulles (IAD)

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

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 5:02, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2217

08:20

Seattle-Tacoma (SEA)

16:26

Washington Dulles (IAD)

Operates only on 2026-02-04

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 5:06, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA2474

08:00

Seattle-Tacoma (SEA)

16:02

Washington Dulles (IAD)

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

Mon
-

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 5:02, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA2474

08:00

Seattle-Tacoma (SEA)

16:02

Washington Dulles (IAD)

Effective 2026-03-07 through 2026-03-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun

Duration: 5:02, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA2474

08:00

Seattle-Tacoma (SEA)

16:02

Washington Dulles (IAD)

Effective 2026-03-09 through 2026-03-23

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 5:02, non-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1784

12:12

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Operates only on 2026-02-12

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 8:09, 1-stop
Boeing 737 MAX 8 (7M8)

Non-Direct Flights:

United Airlines UA1784

12:12

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Operates only on 2026-02-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 8:09, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1784

12:18

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Effective 2026-02-22 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 8:03, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1784

12:25

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Effective 2026-02-13 through 2026-02-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 7:56, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1784

12:42

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Effective 2026-02-14 through 2026-02-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 7:39, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1784

12:43

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Effective 2026-02-16 through 2026-02-26

Mon

Tue

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 7:38, 1-stop
Boeing 737-900 (739)

Non-Direct Flights:

United Airlines UA1784

12:43

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

Operates only on 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 7:38, 1-stop
Boeing 737 MAX 9 (7M9)

Non-Direct Flights:

United Airlines UA1784

12:43

Seattle-Tacoma (SEA)

23:21

Washington Dulles (IAD)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 7:38, 1-stop
Boeing 737-900 (739)

A domestic route departing from the Seattle-Tacoma airport (SEA) and arriving at Washington Dulles airport (IAD).
The flight distance is 2299 miles, or 3699 km.
The timezone of the departure airport is UTC-8 , and the timezone of the arrival airport is UTC-5 . 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 4:53 and 5:11.

All SEA-IAD flights

All United Airlines flights

Return (IAD-SEA) flights

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