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Dulles International Airport to Seattle-Tacoma International Airport flight
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Cheap Flights from Dulles International Airport to Seattle-Tacoma International Airport

Search for flights from Washington D.C. to Seattle. Find affordable one-way or round-trip flights.

  • One way
  • Round-trip
sortSort by: Lowest Price
  • Sort by: Lowest Price
  • Sort by: Earliest Flight
      • IAD19:09
        5h 51m
        Direct
        SEA22:00
        Washington D.C. - Seattle|Wed, May 15|Alaska Airlines
        US$123US$177
        30% OFF
        30% OFF
        US$177US$123
      • IAD19:09
        5h 51m
        Direct
        SEA22:00
        Washington D.C. - Seattle|Mon, May 6|Alaska Airlines
        US$127US$177
        28% OFF
        28% OFF
        US$177US$127
      • IAD07:10
        10h 17m
        1 stop
        SEA14:27
        Washington D.C. - Seattle|Tue, Apr 30|Alaska Airlines
        US$128US$177
        27% OFF
        27% OFF
        US$177US$128
      • IAD17:45
        5h 53m
        Direct
        SEA20:38
        Washington D.C. - Seattle|Tue, Apr 30|Delta Air Lines
        US$130
        US$130
      • IAD07:40
        5h 40m
        Direct
        SEA10:20
        Washington D.C. - Seattle|Sat, Apr 27|Alaska Airlines
        US$130
        US$130
      • IAD07:40
        5h 40m
        Direct
        SEA10:20
        Washington D.C. - Seattle|Tue, May 7|Alaska Airlines
        US$131
        US$131
      • IAD07:30
        5h 50m
        Direct
        SEA10:20
        Washington D.C. - Seattle|Sat, May 4|Delta Air Lines
        US$131
        US$131
      • IAD18:05
        22h 20m
        1 stop
        SEA13:25
        Washington D.C. - Seattle|Sat, May 18|Alaska Airlines
        US$134
        US$134
      • IAD17:45
        5h 53m
        Direct
        SEA20:38
        Washington D.C. - Seattle|Sat, Apr 27|Delta Air Lines
        US$136
        US$136
      • IAD19:09
        5h 51m
        Direct
        SEA22:00
        Washington D.C. - Seattle|Wed, May 8|Alaska Airlines
        US$136
        US$136
      • IAD13:00
        3h 5m
        Direct
        SEA14:00
        Washington D.C. - Seattle|Fri, May 3|Alaska Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Selected Airlines from Dulles International Airport to Seattle-Tacoma International Airport

View airlines operating flights from Washington D.C. to Seattle. Compare prices and find the airline that meets your travel needs to enjoy a comfortable journey.

Alaska Airlines
From US$123
Delta Air Lines
From US$130
Sun Country Airlines
From US$140
American Airlines
From US$151
United Airlines
From US$152
Southwest Airlines
From US$153
Southern Airways Express
From US$177
ANA airlines
Find more flights and airlines
Flight Schedule from Dulles International Airport to Seattle-Tacoma International Airport

Check on the flight schedule from Washington D.C. to Seattle to find the flight that matches your travel plan.

Flight info.
Departure
Arrival
Weekly Schedule

  1. AS499

    Alaska Airlines

    07:02

    IAD

    5.7h

    Direct

    09:44

    SEA

    SMTWTFS
    Search

  2. AS277

    Alaska Airlines

    07:10

    IAD

    5.4h

    09:33

    LAX

    SM-WTFS
    Search

  3. AS1219

    Alaska Airlines

    11:10

    LAX

    2.8h

    14:00

    SEA

    SMTWTFS

  4. DL748

    Delta Air Lines

    07:30

    IAD

    5.8h

    Direct

    10:20

    SEA

    SMTWTF-
    Search

  5. SY224

    Sun Country Airlines

    11:20

    IAD

    2.9h

    13:11

    MSP

    S--W--S
    Search

  6. SY285

    Sun Country Airlines

    14:14

    MSP

    3.9h

    16:06

    SEA

    S-TWT--

  7. AS507

    Alaska Airlines

    16:16

    IAD

    5.3h

    18:34

    SAN

    SMTWTFS
    Search

  8. AS1199

    Alaska Airlines

    20:50

    SAN

    2.9h

    23:44

    SEA

    S-TWTFS

  9. AS507

    Alaska Airlines

    16:16

    IAD

    5.3h

    18:34

    SAN

    SMTWTFS
    Search

  10. AS1071

    Alaska Airlines

    18:49

    SAN

    2.9h

    21:44

    SEA

    S--WTFS

  11. AA2414

    American Airlines

    17:14

    IAD

    3.7h

    19:55

    DFW

    SMTWTFS
    Search

  12. AA2927

    American Airlines

    21:22

    DFW

    4.5h

    23:49

    SEA

    SMTWTFS

  13. DL952

    Delta Air Lines

    17:45

    IAD

    5.9h

    Direct

    20:38

    SEA

    SMTWTFS
    Search

  14. AS396

    Alaska Airlines

    17:55

    IAD

    5.8h

    Direct

    20:46

    SEA

    -----F-
    Search

  15. AS406

    Alaska Airlines

    18:37

    IAD

    5.9h

    Direct

    21:30

    SEA

    SMTWTFS
    Search
Find more flights and airlines

Dulles International Airport to Seattle-Tacoma International Airport Flights Info

Flight distance3,705.38km
Cheapest one-way ticket price$123
Cheapest return ticket price$152

FAQs for Dulles International Airport to Seattle-Tacoma International Airport Flights

  • How long is a flight from Dulles International Airport to Seattle-Tacoma International Airport?

    It takes around 5 hours 46 minutes to fly from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA).

  • How many daily flights are there from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA)?

    There are around 7 daily flights from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA).

  • When are flight tickets from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA) the cheapest?

    Tickets cost around $215 in June, making it the cheapest month to book. Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA) is a popular route, so don't forget to book your tickets in advance.

  • When are flight tickets from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA) most expensive?

    The route from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA) is quite popular. Without considering departure times or holidays, tickets cost around $365 in April, the most expensive month to book this route.

  • What time does the earliest flight from Dulles International Airport to Seattle-Tacoma International Airport depart?

    The earliest flight departs from Dulles International Airport (IAD) at 07:00 and arrives in Seattle-Tacoma International Airport (SEA) at 09:30.

  • What time does the latest flight from Dulles International Airport to Seattle-Tacoma International Airport depart?

    The latest flight departs from Dulles International Airport (IAD) at 19:09 and arrives in Seattle-Tacoma International Airport (SEA) at 22:00.

  • What is the transportation method from the main airport to downtown in Seattle?

    • The distance from Seattle-Tacoma International Airport to downtown is about 17km. It takes about 30 minutes by taxi.

  • Which airline operates the most direct flights from Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA)?

    Alaska Airlines is a very popular airline operating an average of 2821 flights per month.

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