Trip.com
>
Flights
>
Flights to United States
>
Flights to Washington
>
Flights to Seattle
>
Washington D.C. to Seattle flight
>
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 JPY 24,460 and round-trip from JPY 34,010. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        DCA 16:45
        5h 40m
        Nonstop
        SEA 19:25
        Washington D.C. - Seattle | Thu, Oct 8 | Delta Air Lines
        SEA 07:20
        5h 3m
        Nonstop
        DCA 15:23
        Seattle - Washington D.C. | Tue, Oct 13 | Delta Air Lines
        JPY 37,270 JPY 70,400
        47% off
        47% off
        JPY 70,400 JPY 37,270
      • DCA 16:45
        5h 50m
        Nonstop
        SEA 19:35
        Washington D.C. - Seattle | Tue, Nov 3 | Delta Air Lines
        SEA 11:58
        5h 8m
        Nonstop
        IAD 20:06
        Seattle - Washington D.C. | Tue, Nov 10 | Delta Air Lines
        JPY 43,760 JPY 70,400
        38% off
        38% off
        JPY 70,400 JPY 43,760
      • DCA 08:00
        5h 59m
        Nonstop
        SEA 10:59
        Washington D.C. - Seattle | Tue, Nov 3 | Alaska Airlines
        SEA 21:49
        4h 55m
        Nonstop
        IAD 05:44
        Seattle - Washington D.C. | Tue, Nov 10 | Alaska Airlines
        JPY 45,370 JPY 70,400
        36% off
        36% off
        JPY 70,400 JPY 45,370
      • DCA 16:45
        5h 50m
        Nonstop
        SEA 19:35
        Washington D.C. - Seattle | Wed, Nov 4 | Delta Air Lines
        SEA 11:58
        5h 8m
        Nonstop
        IAD 20:06
        Seattle - Washington D.C. | Mon, Nov 9 | Delta Air Lines
        JPY 46,660
        34% off
        JPY 70,400 JPY 46,660
      • DCA 17:00
        5h 55m
        Nonstop
        SEA 19:55
        Washington D.C. - Seattle | Thu, Oct 8 | Alaska Airlines
        SEA 15:56
        5h 3m
        Nonstop
        IAD 23:59
        Seattle - Washington D.C. | Tue, Oct 13 | Alaska Airlines
        JPY 50,080
        28% off
        JPY 70,400 JPY 50,080
      • 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
        JPY 34,010
        52% off
        JPY 70,400 JPY 34,010
      • 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
        JPY 41,090
        42% off
        JPY 70,400 JPY 41,090
      • 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 |
        JPY 43,360
        38% off
        JPY 70,400 JPY 43,360
      • 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
        JPY 45,020
        36% off
        JPY 70,400 JPY 45,020
      • 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
        JPY 46,850
        33% off
        JPY 70,400 JPY 46,850
      • 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
        JPY 51,230
        27% off
        JPY 70,400 JPY 51,230
      • 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
        JPY 51,390
        27% off
        JPY 70,400 JPY 51,390
      • WAS 13:00
        17h 25m
        1 stop
        SEA 14:00
        Washington D.C. - Seattle | Thu, Oct 8 | Normal Airline
        SEA 15:00
        6h
        Nonstop
        WAS 16:00
        Seattle - Washington D.C. | Sat, Oct 10 | Normal Airline
        More cheap flights
        More cheap flights
      • Cheapest nonstop
        DCA 17:00
        5h 55m
        Nonstop
        SEA 19:55
        Washington D.C. - Seattle | Fri, Oct 9 | Alaska Airlines
        JPY 31,620 JPY 43,420
        27% off
        27% off
        JPY 43,420 JPY 31,620
      • DCA 17:11
        6h 2m
        Nonstop
        SEA 20:13
        Washington D.C. - Seattle | Tue, Nov 10 | Alaska Airlines
        JPY 31,690 JPY 43,420
        27% off
        27% off
        JPY 43,420 JPY 31,690
      • DCA 13:00
        29h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Sun, Nov 8 | Frontier Airlines
        JPY 24,460 JPY 43,420
        44% off
        44% off
        JPY 43,420 JPY 24,460
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Wed, Nov 18 | Frontier Airlines
        JPY 25,420
        41% off
        JPY 43,420 JPY 25,420
      • DCA 07:00
        11h 40m
        1 stop
        SEA 15:40
        Washington D.C. - Seattle | Wed, Dec 2 | Frontier Airlines
        JPY 25,610
        41% off
        JPY 43,420 JPY 25,610
      • DCA 18:00
        24h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Tue, Nov 17 | Frontier Airlines
        JPY 26,000
        40% off
        JPY 43,420 JPY 26,000
      • DCA 18:00
        24h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Tue, Nov 10 | Frontier Airlines
        JPY 26,000
        40% off
        JPY 43,420 JPY 26,000
      • DCA 07:00
        29h 51m
        1 stop
        SEA 09:51
        Washington D.C. - Seattle | Sun, Nov 1 | Frontier Airlines
        JPY 26,500
        39% off
        JPY 43,420 JPY 26,500
      • DCA 18:00
        24h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Fri, Oct 16 | Frontier Airlines
        JPY 26,710
        38% off
        JPY 43,420 JPY 26,710
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Wed, Oct 28 | Frontier Airlines
        JPY 26,920
        38% off
        JPY 43,420 JPY 26,920
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Fri, Nov 13 | Frontier Airlines
        JPY 27,690
        36% off
        JPY 43,420 JPY 27,690
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Mon, Nov 16 | Frontier Airlines
        JPY 27,690
        36% off
        JPY 43,420 JPY 27,690
      • DCA 07:00
        11h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Wed, Nov 11 | Frontier Airlines
        JPY 27,690
        36% off
        JPY 43,420 JPY 27,690
      • DCA 13:00
        29h 12m
        1 stop
        SEA 15:12
        Washington D.C. - Seattle | Thu, Nov 5 | Frontier Airlines
        JPY 27,760
        36% off
        JPY 43,420 JPY 27,760
      • WAS 13:00
        17h 25m
        1 stop
        SEA 14:00
        Washington D.C. - Seattle | Thu, Oct 8 | Normal Airline
        More cheap flights
        More cheap flights

Displayed flight fares from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

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

Which month offers the lowest one-way fares when flying from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport?

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

Based on Trip.com data from the past 12 months, for cheaper one-way flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport, it is best to book in February, when average fares are JPY 10,590. Try to avoid November, as fares peak at around JPY 66,690.

JPY 66,690
JPY 38,640
JPY 10,590
0
  • JPY 10,590
    Feb
  • JPY 45,070
    Mar
  • JPY 42,100
    Apr
  • JPY 52,280
    May
  • JPY 43,240
    Jun
  • JPY 50,980
    Jul
  • JPY 60,870
    Aug
  • JPY 50,480
    Sep
  • JPY 47,720
    Oct
  • JPY 66,690
    Nov
  • JPY 39,960
    Dec
  • JPY 22,240
    Jan

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

Data is based on the past 12 months. It shows the average fares by day of the week for flights from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport on Trip.com.

Based on Trip.com data from the past 12 months, the cheapest day to depart from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport is Saturday, when average fares are usually lower than other days. Avoid departing on Thursday, as fares are typically the highest.

JPY 59,770
JPY 42,325
JPY 24,880
JPY 7,435
    Cheapest
  • JPY 48,220
    Mon
  • JPY 53,540
    Tue
  • JPY 50,050
    Wed
  • JPY 59,770
    Thu
  • JPY 47,420
    Fri
  • JPY 24,880
    Sat
  • JPY 37,440
    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 JPY 20,850) among 8 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Frontier Airlines
From JPY 20,850
American Airlines
From JPY 28,560
Alaska Airlines
From JPY 29,310
Hahn Air
From JPY 32,750
Air Canada
From JPY 33,260
Delta Air Lines
From JPY 36,100
United Airlines
From JPY 39,990
Jetblue Airways
From JPY 56,050

Find more flights and airlines

What is the flight schedule from Ronald Reagan Washington National 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. F9685

    Ronald Reagan Washington National Airport

    07:00

    DCA

    4h 16m

    Nonstop

    09:16

    DEN

    S M T W T F S
    Search

  2. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Nonstop

    15:12

    SEA

    S M T W T F S

  3. F9689

    Ronald Reagan Washington National Airport

    18:00

    DCA

    4h 3m

    Nonstop

    20:03

    DEN

    S M - W T F S
    Search

  4. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Nonstop

    15:12

    SEA

    S M T W T F S

  5. F9687

    Ronald Reagan Washington National Airport

    13:00

    DCA

    4h 4m

    Nonstop

    15:04

    DEN

    S - T W T F S
    Search

  6. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Nonstop

    15:12

    SEA

    S M T W T F S
Find more flights and airlines

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 3,741.3 km
Cheapest one-way ticket price JPY 24,460
Cheapest return ticket price JPY 34,010

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 2 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 JPY 79,660 in October, the most expensive month to book this route.
  • The earliest flight departs from Ronald Reagan Washington National Airport at 08:00 and arrives in Seattle-Tacoma International Airport at 10:57.
  • The latest flight departs from Ronald Reagan Washington National Airport at 17:03 and arrives in Seattle-Tacoma International Airport at 19:58.
    • The distance from Seattle-Tacoma International Airport to downtown is about 17 km, 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 JPY 24,460, and round-trip fares start from JPY 34,010. The current lowest fare is a Frontier Airlines flight departing on Sun, Nov 8; 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 JPY 49,480. 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.

Popular Destinations

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

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before you pay. Charges for checked baggage, onboard meals, Wi‑Fi, and other optional services are also included where applicable in the flight cards.

Real-time pricing updates

Prices, availability, and travel details on this page have been updated within the last 24 hours, and for many routes are refreshed in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
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.
Cancellation/change due to a flight schedule change:
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.