Southwest Airlines Seattle to Washington D.C. Flights

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Cheapflightsplus.com will find cheap Southwest Airlines flights from Seattle to Washington D.C.. Compare airline ticket prices and book air tickets starting from $165 from trusted online travel agencies, web sites and directly from airlines. Check flights schedule of Southwest Airlines, arrivals and departure details below.

Find Cheap Airfare Seattle (WA) — Washington D.C. (DC) by Southwest Airlines

To find cheap tickets choose a day of your departure with attractive price on the graph below and click «Find flights». For round trip flights please click «Check prices for return flight». The cheapest airfare is in may: one-way - $165, two-way – $283.

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Cheap Flights from Seattle to Washington D.C. by Southwest Airlines

Look at the list of plane tickets for the most connecting flights by Southwest Airlines, their prices start from $165. There’re no direct flights. The fastest connecting flight – 6h 20m.

Price	Departure	Arrival	Flight Time	Airline	Flight
from $165 Find flight	6:05 am Seattle Seattle-Tacoma Intl	6:25 pm Washington D.C. Dulles International	9h 20m layover 3h 30m - Denver	Southwest Airlines	WN1222 WN1855
from $165 Find flight	7:30 am Seattle Seattle-Tacoma Intl	6:25 pm Washington D.C. Dulles International	7h 55m layover 2h 5m - Denver	Southwest Airlines	WN2492 WN1855
from $249 Find flight	6:55 am Seattle Seattle-Tacoma Intl	6:20 pm Washington D.C. Ronald Reagan	8h 25m layover 2h 40m - Chicago	Southwest Airlines	WN2485 WN199
from $249 Find flight	9:25 am Seattle Seattle-Tacoma Intl	6:45 pm Washington D.C. Ronald Reagan	6h 20m layover 0h 35m - Lake Saint Louis	Southwest Airlines	WN1866 WN309
from $249 Find flight	11:45 am Seattle Seattle-Tacoma Intl	10:40 pm Washington D.C. Dulles International	7h 55m layover 2h 5m - Denver	Southwest Airlines	WN1591 WN2330

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*Departure and arrival times are local. Prices are for one-way flights. Information refreshed on 04/24/2025

Southwest Airlines Flight Schedule Seattle to Washington D.C.

Below is a detailed 2025 flight schedule for today, tomorrow and all other days. It may vary depending on season and a day of the week of your desired trip. We recommend booking your itinerary at least 2 weeks prior your travel to get the best price and availability by the airline.

Departure	Flight Details	Flight Time	Price
11:45 am — 10:40 pm	11:45 am — 3:25 pm WN1591 Southwest Airlines Seattle — Denver 2h 5m stop 5:30 pm — 10:40 pm WN2330 Southwest Airlines Denver — Washington D.C.	7h 55m including layover	Find flight from$249
6:05 am — 6:25 pm	6:05 am — 9:40 am WN1222 Southwest Airlines Seattle — Denver 3h 30m stop 1:10 pm — 6:25 pm WN1855 Southwest Airlines Denver — Washington D.C.	9h 20m including layover	Find flight from$165
6:05 am — 4:00 pm	6:05 am — 9:40 am WN1222 Southwest Airlines Seattle — Denver 55m stop 10:35 am — 4:00 pm WN2513 Southwest Airlines Denver — Washington D.C.	6h 55m including layover	Find flight from$249
6:55 am — 6:20 pm	6:55 am — 1:00 pm WN2485 Southwest Airlines Seattle — Chicago 2h 40m stop 3:40 pm — 6:20 pm WN199 Southwest Airlines Chicago — Washington D.C.	8h 25m including layover	Find flight from$249
7:30 am — 6:25 pm	7:30 am — 11:05 am WN2492 Southwest Airlines Seattle — Denver 2h 5m stop 1:10 pm — 6:25 pm WN1855 Southwest Airlines Denver — Washington D.C.	7h 55m including layover	Find flight from$165
9:25 am — 6:45 pm	9:25 am — 3:15 pm WN1866 Southwest Airlines Seattle — Lake Saint Louis 35m stop 3:50 pm — 6:45 pm WN309 Southwest Airlines Lake Saint Louis — Washington D.C.	6h 20m including layover	Find flight from$249

Departure	Arrival	Flight Details	Flight Time	Price
		stop stop	including layover	Find flight from$

*Departure and arrival times are local. Last updated on 04/24/2025

Flight Information

There are 7 flights by Southwest Airlines from Seattle to Washington D.C. every week with departures from Seattle-Tacoma Intl, Boeing Field International Airport, Kenmore Air Harbor SPB. All flights arrive at Ronald Reagan and Dulles International.

Departures start from 11:45 am to 9:25 am. Nonstop flight is 6h 20m. The time difference between Seattle and Washington D.C. is 3h.

The fastest flight 6h 20m
Average flight time 7h 55m
The earliest flight 11:45 am
The latest flight 9:25 am
Distance 2321 ml

The cheapest flight by Southwest Airlines that our users were able to find is $165. This airfare is economy class on one-way WN1222 flight for October 3, 2018 leaving Seattle-Tacoma Intl in Seattle at 6:05 am, it includes all taxes and additional fees.

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Southwest Airlines Airplanes on the Route

List of the most popular Southwest Airlines airplanes flying from Seattle to Washington D.C.:

Other Popular Airlines on the Route

Besides Southwest Airlines there are other 1 airline carriers between Seattle and Washington D.C.. Please review schedules and prices from the most popular airlines to find the best airfare deals from Seattle to Washington D.C..

Nonstop flights

There are 1 direct flights every day from Seattle. Airlines and fares are below:

AS - Alaska Airlines

from $160

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Connecting Flights

List of flights with layovers (1 and more stops):

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How to book an air ticket yourself?

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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.
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