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

Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 17:15 Dulles, Washington (IAD) 20:20 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-900 (739) 6:05 Effective 2024-10-27 through 2024-11-27
Daily 17:15 Dulles, Washington (IAD) 20:20 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-900 (739) 6:05 Effective 2024-11-29 through 2024-12-18
Daily 17:20 Dulles, Washington (IAD) 20:08 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737 MAX 9 (7M9) 5:48 Effective 2024-09-26 through 2024-10-26
Daily 17:26 Dulles, Washington (IAD) 20:14 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737 MAX 9 (7M9) 5:48 Valid until 2024-09-25
Mon,Thu,Fri,Sun 17:28 Dulles, Washington (IAD) 20:31 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-800 (738) 6:03 Effective 2024-12-19 through 2024-12-23
Mon,Sun 17:28 Dulles, Washington (IAD) 20:31 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-800 (738) 6:03 Effective 2025-01-05 through 2025-01-06
Daily 17:33 Dulles, Washington (IAD) 20:36 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-800 (738) 6:03 Effective 2024-12-24 through 2025-01-04
Sat 17:35 Dulles, Washington (IAD) 20:38 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-800 (738) 6:03 Operates only on 2024-12-21
Daily 17:35 Dulles, Washington (IAD) 20:36 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-900 (739) 6:01 Effective 2025-01-07 through 2025-02-12
Daily 17:35 Dulles, Washington (IAD) 20:10 Seattle-Tacoma (SEA)
United Airlines UA 326 Non-stop Boeing 737-900 (739) 5:35 Effective from 2025-02-13
Daily 12:40 Dulles, Washington (IAD) 15:28 Seattle-Tacoma (SEA)
United Airlines UA 1932 Non-stop Boeing 737-800 (738) 5:48 Valid until 2024-09-25
Mon,Tue,Thu 08:30 Dulles, Washington (IAD) 11:18 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-800 (738) 5:48 Effective 2024-09-26 through 2024-10-24
Fri 08:30 Dulles, Washington (IAD) 11:18 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-900 (739) 5:48 Operates only on 2024-09-27
Fri-Sun 08:30 Dulles, Washington (IAD) 11:19 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Airbus A319 (319) 5:49 Effective 2024-09-28 through 2024-10-26
Wed 08:30 Dulles, Washington (IAD) 11:18 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-700 (73G) 5:48 Effective 2024-10-02 through 2024-10-23
Mon,Wed,Fri-Sun 08:35 Dulles, Washington (IAD) 11:35 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-700 (73G) 6:00 Effective 2024-10-27 through 2024-12-02
Tue,Thu 08:35 Dulles, Washington (IAD) 11:35 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-800 (738) 6:00 Effective 2024-10-29 through 2024-11-26
Thu 08:35 Dulles, Washington (IAD) 11:35 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-900 (739) 6:00 Operates only on 2024-11-28
Mon-Fri 08:35 Dulles, Washington (IAD) 11:32 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-800 (738) 5:57 Effective 2024-12-19 through 2025-01-06
Sat 08:35 Dulles, Washington (IAD) 11:33 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Airbus A319 (319) 5:58 Effective 2024-12-21 through 2025-01-04
Sun 08:35 Dulles, Washington (IAD) 11:33 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Airbus A320 (320) 5:58 Effective 2024-12-22 through 2025-01-05
Daily 08:35 Dulles, Washington (IAD) 11:26 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737-900 (739) 5:51 Effective from 2025-02-13
Wed,Sun 08:55 Dulles, Washington (IAD) 11:44 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Airbus A320 (320) 5:49 Valid until 2024-09-25
Mon,Tue,Thu-Sat 08:55 Dulles, Washington (IAD) 11:43 Seattle-Tacoma (SEA)
United Airlines UA 1964 Non-stop Boeing 737 MAX 9 (7M9) 5:48 Valid until 2024-09-24
Non-Direct Flights:
Daily 12:35 Dulles, Washington (IAD) 19:05 Seattle-Tacoma (SEA)
United Airlines UA 1657 1-stop Boeing 737 MAX 9 (7M9) 9:30 Effective 2024-12-19 through 2025-01-06


United Airlines flights from Dulles, Washington (IAD) to Seattle-Tacoma (SEA).
Select flight date:
FLIGHT SCHEDULE
Direct Flights:

Effective 2024-10-27 through 2024-11-27
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:05, non-stop
Boeing 737-900 (739)

Effective 2024-11-29 through 2024-12-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:05, non-stop
Boeing 737-900 (739)

Effective 2024-09-26 through 2024-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:48, non-stop
Boeing 737 MAX 9 (7M9)

Valid until 2024-09-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:48, non-stop
Boeing 737 MAX 9 (7M9)

Effective 2024-12-19 through 2024-12-23
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 6:03, non-stop
Boeing 737-800 (738)

Effective 2025-01-05 through 2025-01-06
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 6:03, non-stop
Boeing 737-800 (738)

Effective 2024-12-24 through 2025-01-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:03, non-stop
Boeing 737-800 (738)

Operates only on 2024-12-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 6:03, non-stop
Boeing 737-800 (738)

Effective 2025-01-07 through 2025-02-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:01, non-stop
Boeing 737-900 (739)

Effective from 2025-02-13
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:35, non-stop
Boeing 737-900 (739)

Valid until 2024-09-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:48, non-stop
Boeing 737-800 (738)

Effective 2024-09-26 through 2024-10-24
Mon
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 5:48, non-stop
Boeing 737-800 (738)

Operates only on 2024-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 5:48, non-stop
Boeing 737-900 (739)

Effective 2024-09-28 through 2024-10-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
Sun
Duration: 5:49, non-stop
Airbus A319 (319)

Effective 2024-10-02 through 2024-10-23
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 5:48, non-stop
Boeing 737-700 (73G)

Effective 2024-10-27 through 2024-12-02
Mon
Tue
-
Wed
Thu
-
Fri
Sat
Sun
Duration: 6:00, non-stop
Boeing 737-700 (73G)

Effective 2024-10-29 through 2024-11-26
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 6:00, non-stop
Boeing 737-800 (738)

Operates only on 2024-11-28
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 6:00, non-stop
Boeing 737-900 (739)

Effective 2024-12-19 through 2025-01-06
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 5:57, non-stop
Boeing 737-800 (738)

Effective 2024-12-21 through 2025-01-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 5:58, non-stop
Airbus A319 (319)

Effective 2024-12-22 through 2025-01-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 5:58, non-stop
Airbus A320 (320)

Effective from 2025-02-13
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:51, non-stop
Boeing 737-900 (739)

Valid until 2024-09-25
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
Duration: 5:49, non-stop
Airbus A320 (320)

Valid until 2024-09-24
Mon
Tue
Wed
-
Thu
Fri
Sat
Sun
-
Duration: 5:48, non-stop
Boeing 737 MAX 9 (7M9)

Non-Direct Flights:

Effective 2024-12-19 through 2025-01-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:30, 1-stop
Boeing 737 MAX 9 (7M9)
  • A domestic route departing from the Dulles, Washington 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 6:05.