Cheap Flights from Seattle, WA to Washington D.C., DC from $126

On Cheapflightsplus.com you will find 12 direct and 28 connecting flights from Seattle to Washington D.C.. You can compare airfare deals from 5 airlines and multiple travel sites from $126, book and save on cheap plane tickets and last minute offers. Also check out SEA-WAS flight schedule to find best flight time, convenient departure and arrival airports.

Find One-Way and Round-Trip Seattle to Washington D.C. Flight Deals

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $126 (one-way), $216 (round-trip).
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Full flight schedule will help you in detecting at what time planes fly from Seattle to Washington D.C.. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.
Departure Arrival Flight Details Flight Duration Price
08:00 — 16:11
08:00 — 16:11 UA1873 United Airlines
Seattle — Washington D.C.
5h 11m
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from$213
08:34 — 16:43
08:34 — 16:43 AS4 Alaska Airlines
Seattle — Washington D.C.
5h 9m
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from$211
08:34 — 16:43
08:34 — 16:43 HA6704 Hawaiian Airlines
Seattle — Washington D.C.
5h 9m
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from$214
09:15 — 17:13
09:15 — 17:13 AS406 Alaska Airlines
Seattle — Washington D.C.
4h 58m
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from$206
13:00 — 20:57
13:00 — 20:57 UA2275 United Airlines
Seattle — Washington D.C.
4h 57m
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from$239
13:58 — 21:59
13:58 — 21:59 HA6702 Hawaiian Airlines
Seattle — Washington D.C.
5h 1m
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from$159
13:58 — 21:59
13:58 — 21:59 AS2 Alaska Airlines
Seattle — Washington D.C.
5h 1m
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from$164
15:59 — 23:59
15:59 — 23:59 AS348 Alaska Airlines
Seattle — Washington D.C.
5h
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from$140
22:05 — 06:02
+1 day
22:05 — 06:02 UA2402 United Airlines
Seattle — Washington D.C.
4h 57m
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from$213
23:20 — 07:17
+1 day
23:20 — 07:17 UA2211 United Airlines
Seattle — Washington D.C.
4h 57m
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from$211
23:30 — 07:27
+1 day
23:30 — 07:27 AS367 Alaska Airlines
Seattle — Washington D.C.
4h 57m
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from$163
23:30 — 07:27
+1 day
23:30 — 07:27 HA6718 Hawaiian Airlines
Seattle — Washington D.C.
4h 57m
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from$203
00:20 — 10:56
00:20 — 06:28 UA1832 United Airlines
Seattle — Chicago
1h 32m stop
08:00 — 10:56 UA1010 United Airlines
Chicago — Washington D.C.
7h 36m
including layover
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from$209
00:20 — 11:55
00:20 — 06:28 UA1832 United Airlines
Seattle — Chicago
2h 24m stop
08:52 — 11:55 UA2277 United Airlines
Chicago — Washington D.C.
8h 35m
including layover
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from$227
05:10 — 16:50
05:10 — 07:22 UA706 United Airlines
Seattle — San Francisco
1h 8m stop
08:30 — 16:50 UA1678 United Airlines
San Francisco — Washington D.C.
8h 40m
including layover
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from$230
05:25 — 16:02
05:20 — 06:17 HA6833 Hawaiian Airlines
Seattle — Portland
1h 40m stop
08:00 — 16:06 HA6710 Hawaiian Airlines
Portland — Washington D.C.
7h 37m
including layover
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from$187
06:00 — 16:18
06:00 — 12:07 AS408 Alaska Airlines
Seattle — Chicago
1h 15m stop
13:22 — 16:18 AS4384 Alaska Airlines
Chicago — Washington D.C.
7h 18m
including layover
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from$4915
06:25 — 21:57
06:25 — 10:16 F93406 Frontier Airlines
Seattle — Denver
6h 14m stop
16:25 — 21:59 F9690 Frontier Airlines
Denver — Washington D.C.
12h 32m
including layover
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from$126
10:56 — 21:02
10:56 — 17:05 UA265 United Airlines
Seattle — Chicago
55m stop
18:00 — 21:02 UA1269 United Airlines
Chicago — Washington D.C.
7h 6m
including layover
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from$346
10:56 — 20:55
10:56 — 17:05 UA265 United Airlines
Seattle — Chicago
51m stop
17:56 — 20:55 UA2677 United Airlines
Chicago — Washington D.C.
6h 59m
including layover
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from$529
12:49 — 00:45
+1 day
12:49 — 16:40 UA757 United Airlines
Seattle — Denver
2h 37m stop
19:17 — 00:45 UA1704 United Airlines
Denver — Washington D.C.
8h 56m
including layover
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from$285
14:24 — 00:45
+1 day
14:24 — 18:15 UA2859 United Airlines
Seattle — Denver
1h 2m stop
19:17 — 00:45 UA1704 United Airlines
Denver — Washington D.C.
7h 21m
including layover
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from$222
17:10 — 05:18
+1 day
17:10 — 19:26 UA2482 United Airlines
Seattle — San Francisco
1h 44m stop
21:10 — 05:18 UA2725 United Airlines
San Francisco — Washington D.C.
9h 8m
including layover
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from$328
09:12 — 09:23
+1 day
09:10 — 14:25 SY282 Sun Country Airlines
Seattle — Minneapolis
5h 20m stop
19:50 — 23:08 G4246 Allegiant Air
Minneapolis — Fletcher
8h 52m stop
08:00 — 09:23 G4217 Allegiant Air
Fletcher — Washington D.C.
21h 11m
including layover
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from$211
17:14 — 08:22
+1 day
17:14 — 20:05 UA2397 United Airlines
Seattle — Los Angeles
50m stop
20:55 — 05:08 UA2397 United Airlines
Los Angeles — Newark
1h 51m stop
07:29 — 08:51 UA4434 United Airlines
Newark — Washington D.C.
12h 8m
including layover
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from$630
*Departure and arrival times - local. Updated on July 25, 2025

Flight Information

Below we will explain in detail what the flights cost on the destination from Seattle to Washington D.C. depends on and how to choose the most interesting flight option for you.

Distance between Seattle and Washington D.C. is 3735 miles. Time difference between the cities is 3h. Airplanes depart 00:20 to 23:59 from 3 Seattle airports and arrive 00:20 to 23:59 to 2 Washington D.C. airports. Average flight time is 4h 59m.

  • The fastest flight 4h 57m
  • Average flight time 4h 59m
  • The earliest flight 00:20
  • The latest flight 23:59
  • Distance 2321 ml

The cheapest months to travel to Washington D.C. are june (from 113 $), may (from 121 $), july (from 124 $).

The most expensive months are september (from 140 $), august (from 126 $), july (from 124 $).

What is the lowest airfare Seattle to Washington D.C.?

The cheapest plane ticket found by our users is $126. This airfare is for economy class on one-way F93406 flight by Frontier Airlines for August 15, 2025 which leaves Seattle-Tacoma Intl in Seattle at 06:25 am and arrives at Washington D.C. Ronald Reagan at 21:57.

Economy class
$126
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Business class
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First class
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Popular Airlines on the Route

The flight Seattle — Washington D.C. is served by 5 regular airlines and 2 low-cost airlines. Most of the flights on this route are operated by Alaska Airlines - 9 departures per week at the price of from $ 140 . And the most expensive tickets are offered by Alaska Airlines airline - from $ 5050.

Direct flights

There are 12 nonstop flights on the route. The fastest direct flight is AS367 by Alaska Airlines takes 4h 57m and the cheapest is F93406 by Frontier Airlines for $140.

  • AS - Alaska Airlines
    from $140
    Find
  • HA - Hawaiian Airlines
    from $159
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  • UA - United Airlines
    from $211
    Find
See more direct flights

Connecting Flights

There are 28 flights with layovers on the route. The fastest connecting flight is AS429 by Alaska Airlines takes 6h 52m and the cheapest is F93406 by Frontier Airlines for $126.

  • AS - Alaska Airlines
    from $389
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  • F9 - Frontier Airlines
    from $126
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  • SY - Sun Country Airlines
    from $211
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  • HA - Hawaiian Airlines
    from $187
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  • UA - United Airlines
    from $209
    Find
See more connecting flights

Airports

You can fly from Seattle to Washington D.C. from 3 airports (Boeing Field International Airport, Seattle-Tacoma Intl, Kenmore Air Harbor SPB).

Seattle airports

  • Boeing Field International Airport-BFI
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  • Seattle-Tacoma Intl-SEA
    from $126
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  • Kenmore Air Harbor SPB-LKE
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Washington D.C. airports

  • Dulles International-IAD
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  • Ronald Reagan-DCA
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How to book a plane ticket yourself?

How to book an air ticket yourself?
  • Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
  • Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
  • Click «Buy» when you are ready — our system will redirect you to the site that sells the selected flight ticket.
  • Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
  • That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.

    To find a plane ticket, please select dates.

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