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Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport flight

Explore the cheapest one-way and round-trip flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport over the next 90 days, with one-way fares from S$ 171 and round-trip from S$ 278. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        DCA 16:45
        5h 40m
        Direct
        SEA 19:25
        Washington D.C. - Seattle | Thu, Oct 8 | Delta Air Lines
        SEA 07:20
        5h 3m
        Direct
        DCA 15:23
        Seattle - Washington D.C. | Tue, Oct 13 | Delta Air Lines
        S$ 305 S$ 576
        47% off
        47% off
        S$ 576 S$ 305
      • DCA 16:45
        5h 50m
        Direct
        SEA 19:35
        Washington D.C. - Seattle | Tue, Nov 3 | Delta Air Lines
        SEA 11:58
        5h 8m
        Direct
        IAD 20:06
        Seattle - Washington D.C. | Tue, Nov 10 | Delta Air Lines
        S$ 358 S$ 576
        38% off
        38% off
        S$ 576 S$ 358
      • DCA 08:00
        5h 59m
        Direct
        SEA 10:59
        Washington D.C. - Seattle | Tue, Nov 3 | Alaska Airlines
        SEA 21:49
        4h 55m
        Direct
        IAD 05:44
        Seattle - Washington D.C. | Tue, Nov 10 | Alaska Airlines
        S$ 371 S$ 576
        36% off
        36% off
        S$ 576 S$ 371
      • DCA 16:45
        5h 50m
        Direct
        SEA 19:35
        Washington D.C. - Seattle | Wed, Nov 4 | Delta Air Lines
        SEA 11:58
        5h 8m
        Direct
        IAD 20:06
        Seattle - Washington D.C. | Mon, Nov 9 | Delta Air Lines
        S$ 381
        34% off
        S$ 576 S$ 381
      • DCA 17:00
        5h 55m
        Direct
        SEA 19:55
        Washington D.C. - Seattle | Thu, Oct 8 | Alaska Airlines
        SEA 15:56
        5h 3m
        Direct
        IAD 23:59
        Seattle - Washington D.C. | Tue, Oct 13 | Alaska Airlines
        S$ 409
        28% off
        S$ 576 S$ 409
      • DCA 10:13
        8h 30m
        1 stop
        SEA 15:43
        Washington D.C. - Seattle | Tue, Nov 3 | American Airlines
        SEA 10:47
        7h 5m
        1 stop
        DCA 20:52
        Seattle - Washington D.C. | Tue, Nov 10 | American Airlines
        S$ 278
        52% off
        S$ 576 S$ 278
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Tue, Nov 3 | Frontier Airlines
        SEA 16:27
        26h 23m
        1 stop
        DCA 21:50
        Seattle - Washington D.C. | Tue, Nov 10 | Frontier Airlines
        S$ 336
        42% off
        S$ 576 S$ 336
      • DCA 18:30
        9h 10m
        1 stop
        SEA 00:40
        Washington D.C. - Seattle | Wed, Nov 4 | Hahn Air
        SEA 00:15
        12h
        1 stop
        DCA 15:15
        Seattle - Washington D.C. | Mon, Nov 9 |
        S$ 354
        39% off
        S$ 576 S$ 354
      • DCA 17:10
        8h 49m
        1 stop
        SEA 22:59
        Washington D.C. - Seattle | Thu, Oct 8 | American Airlines
        SEA 23:59
        8h
        1 stop
        DCA 10:59
        Seattle - Washington D.C. | Tue, Oct 13 | American Airlines
        S$ 368
        36% off
        S$ 576 S$ 368
      • DCA 13:00
        29h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Sat, Oct 24 | Frontier Airlines
        SEA 16:27
        16h 37m
        1 stop
        DCA 12:04
        Seattle - Washington D.C. | Tue, Oct 27 | Frontier Airlines
        S$ 383
        34% off
        S$ 576 S$ 383
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Mon, Oct 26 | Frontier Airlines
        SEA 21:16
        30h 4m
        1 stop
        IAD 06:20
        Seattle - Washington D.C. | Wed, Oct 28 | Frontier Airlines
        S$ 419
        27% off
        S$ 576 S$ 419
      • DCA 13:06
        29h 2m
        1 stop
        SEA 15:08
        Washington D.C. - Seattle | Thu, Oct 8 | Frontier Airlines
        SEA 21:45
        29h 35m
        1 stop
        IAD 06:20
        Seattle - Washington D.C. | Sat, Oct 10 | Frontier Airlines
        S$ 420
        27% off
        S$ 576 S$ 420
      • WAS 13:00
        17h 25m
        1 stop
        SEA 14:00
        Washington D.C. - Seattle | Thu, Oct 8 | Normal Airline
        SEA 15:00
        6h
        Direct
        WAS 16:00
        Seattle - Washington D.C. | Sat, Oct 10 | Normal Airline
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      • Cheapest nonstop
        DCA 17:00
        5h 55m
        Direct
        SEA 19:55
        Washington D.C. - Seattle | Fri, Oct 9 | Alaska Airlines
        S$ 259 S$ 355
        27% off
        27% off
        S$ 355 S$ 259
      • DCA 17:11
        6h 2m
        Direct
        SEA 20:13
        Washington D.C. - Seattle | Tue, Nov 10 | Alaska Airlines
        S$ 259 S$ 355
        27% off
        27% off
        S$ 355 S$ 259
      • DCA 18:00
        18h 51m
        1 stop
        SEA 09:51
        Washington D.C. - Seattle | Mon, Oct 19 | Frontier Airlines
        S$ 171 S$ 355
        52% off
        52% off
        S$ 355 S$ 171
      • DCA 13:00
        29h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Tue, Oct 13 | Frontier Airlines
        S$ 185
        48% off
        S$ 355 S$ 185
      • DCA 18:00
        24h 8m
        1 stop
        SEA 15:08
        Washington D.C. - Seattle | Fri, Oct 9 | Frontier Airlines
        S$ 191
        46% off
        S$ 355 S$ 191
      • DCA 13:00
        29h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Wed, Nov 11 | Frontier Airlines
        S$ 200
        44% off
        S$ 355 S$ 200
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Sat, Nov 21 | Frontier Airlines
        S$ 208
        41% off
        S$ 355 S$ 208
      • DCA 07:00
        11h 40m
        1 stop
        SEA 15:40
        Washington D.C. - Seattle | Sat, Dec 5 | Frontier Airlines
        S$ 209
        41% off
        S$ 355 S$ 209
      • DCA 18:00
        24h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Fri, Nov 13 | Frontier Airlines
        S$ 213
        40% off
        S$ 355 S$ 213
      • DCA 13:00
        29h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Sun, Oct 25 | Frontier Airlines
        S$ 213
        40% off
        S$ 355 S$ 213
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Tue, Oct 27 | Frontier Airlines
        S$ 213
        40% off
        S$ 355 S$ 213
      • DCA 07:00
        29h 51m
        1 stop
        SEA 09:51
        Washington D.C. - Seattle | Wed, Nov 4 | Frontier Airlines
        S$ 217
        39% off
        S$ 355 S$ 217
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Sat, Oct 31 | Frontier Airlines
        S$ 220
        38% off
        S$ 355 S$ 220
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Mon, Nov 16 | Frontier Airlines
        S$ 227
        36% off
        S$ 355 S$ 227
      • WAS 13:00
        17h 25m
        1 stop
        SEA 14:00
        Washington D.C. - Seattle | Thu, Oct 8 | Normal Airline
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Flight prices from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport are based on the average fares across airlines for the next three months, based on Trip.com’s latest data.

Trip.com Price Insights: Flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport

Which month has the cheapest one-way flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport?

The data is based on Trip.com data from the past 12 months and shows the average one-way fares by month from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport.

Based on Trip.com data from the past 12 months, the cheapest one-way flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport are usually in February, with an average price of S$ 87. November sees the highest fares, around S$ 545.

S$ 545
S$ 316
S$ 87
0
  • S$ 87
    Feb
  • S$ 368
    Mar
  • S$ 344
    Apr
  • S$ 427
    May
  • S$ 353
    Jun
  • S$ 417
    Jul
  • S$ 497
    Aug
  • S$ 413
    Sep
  • S$ 390
    Oct
  • S$ 545
    Nov
  • S$ 327
    Dec
  • S$ 182
    Jan

Which day of the week has the cheapest flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport?

The data is based on Trip.com data from the past 12 months and shows the average fares by each day of the week from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport.

Based on Trip.com data from the past 12 months, the cheapest day for flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport is Saturday, with average prices lower than other days. Try to avoid departing on Thursday, as fares are typically the highest.

S$ 488
S$ 346
S$ 204
S$ 62
    Cheapest
  • S$ 394
    Mon
  • S$ 438
    Tue
  • S$ 409
    Wed
  • S$ 488
    Thu
  • S$ 388
    Fri
  • S$ 204
    Sat
  • S$ 306
    Sun

Which airline offers the cheapest flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport?

The cheapest airline flying from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport is Frontier Airlines (from S$ 171) among 8 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Frontier Airlines
From S$ 171
American Airlines
From S$ 234
Alaska Airlines
From S$ 240
Hahn Air
From S$ 268
Air Canada
From S$ 272
Delta Air Lines
From S$ 295
United Airlines
From S$ 327
Jetblue Airways
From S$ 458

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What is the flight schedule from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport?

Check the schedule for flights from Washington D.C. to Seattle and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. F9685

    Ronald Reagan Washington National Airport

    07:00

    DCA

    4h 16m

    Direct

    09:16

    DEN

    S M T W T F S
    Search

  2. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Direct

    15:12

    SEA

    S M T W T F S

  3. F9689

    Ronald Reagan Washington National Airport

    18:00

    DCA

    4h 3m

    Direct

    20:03

    DEN

    S M - W T F S
    Search

  4. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Direct

    15:12

    SEA

    S M T W T F S

  5. F9687

    Ronald Reagan Washington National Airport

    13:00

    DCA

    4h 4m

    Direct

    15:04

    DEN

    S - T W T F S
    Search

  6. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Direct

    15:12

    SEA

    S M T W T F S
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About Ronald Reagan Washington National Airport and Seattle-Tacoma International Airport

Learn about Ronald Reagan Washington National Airport (DCA) and Seattle-Tacoma International Airport (SEA) — including location, terminals, transportation, and travel tips.

Flight distance 3,741.3km
Cheapest one-way ticket price S$ 171
Cheapest return ticket price S$ 278

FAQs for Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport Flights

  • How long is the flight from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport?

    Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport takes about 5 hours 25 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 1 daily flights from Ronald Reagan Washington National Airport (DCA) to Seattle-Tacoma International Airport (SEA).
  • The earliest flight from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport departs at 08:00, and the last departs at 17:00, with about 3 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Ronald Reagan Washington National Airport (DCA) to Seattle-Tacoma International Airport (SEA) is quite popular. Without considering departure times or holidays, tickets cost around S$ 651 in October, the most expensive month to book this route.
  • The earliest flight departs from Ronald Reagan Washington National Airport (DCA) at 08:00 and arrives in Seattle-Tacoma International Airport (SEA) at 10:53.
  • The latest flight departs from Ronald Reagan Washington National Airport (DCA) at 17:06 and arrives in Seattle-Tacoma International Airport (SEA) at 19:56.
    • The distance from Seattle-Tacoma International Airport to downtown is about 17km, by taxi about 30 minutes.
  • Delta Air Lines is a very popular airline operating an average of 755 flights per month.
  • One-way flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport currently start from S$ 171, and round-trip fares start from S$ 278. The current lowest fare is a Frontier Airlines flight departing on Mon, Oct 19; prices may vary depending on availability.
  • Yes. Alaska Airlines and Delta Air Lines operate direct flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport, with an average flight time of 5 hours 20 minutes, and around 21 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport is S$ 404. Prices may vary depending on the departure date, airline, and availability.
  • Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport operates around 21 weekly flights, mainly by Alaska Airlines and Delta Air Lines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Ronald Reagan Washington National Airport and Seattle-Tacoma International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

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Note: Prices shown on this page are the lowest estimated prices found in the last 24 hours and include all taxes and fees.

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Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are shown before payment. Charges for checked baggage, meals, Wi-Fi, and other optional services may also appear in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and with many routes refreshed in real time. The more popular the route, the more accurate the data.

Change & Cancellation Policy

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Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
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If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.