DCA - SEA

C$ 220 Find Cheap Flights from Washington, D.C. to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Seattle departing on 26/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Seattle, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
C$ 445
Typical prices: C$ 860-C$ 498
Southwest
Tue 21/7Wed 29/7
DCA - SEA • 1 stop
Cheapest direct flights
C$ 473
Typical prices: C$ 880-C$ 540
Alaska Airlines
Sat 4/7Wed 12/8
DCA - SEA • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
DCA is easier than IAD and worth the higher fare for central Washington, D.C. trips.
On Alaska, pack light: overhead bin space fills fast on DCA-Seattle flights.
Expert advice
Expert advice
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Expert advice
Expert advice
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Direct flights
You can fly direct with Alaska Airlines and Delta. Average duration is 5h 57m
Direct flights
Direct flights
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Direct flights
Direct flights
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When to book
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 31% price drop
Most popular
Good to know
Good to know
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Good to know
Good to know
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Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Washington, D.C. to Seattle (DCA-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington, D.C. to Seattle

Tue, 21 Jul - Wed, 29 Jul
Southwest Logo
6:55 p.m. - 12:25 a.m.
DCA
-
SEA
8h 30m
1 stop
Southwest Logo
6:15 a.m. - 8:55 p.m.
SEA
-
DCA
11h 40m
2 stops
C$ 445Southwest
Tue, 14 Jul - Wed, 29 Jul
Southwest Logo
4:25 p.m. - 12:25 a.m.
DCA
-
SEA
11h 00m
1 stop
Southwest Logo
9:30 a.m. - 6:55 p.m.
SEA
-
DCA
6h 25m
1 stop
C$ 447Southwest
Wed, 22 Jul - Wed, 29 Jul
Southwest Logo
4:25 p.m. - 12:25 a.m.
DCA
-
SEA
11h 00m
1 stop
Southwest Logo
6:15 a.m. - 8:55 p.m.
SEA
-
DCA
11h 40m
2 stops
C$ 454Southwest
Wed, 14 Oct - Thu, 22 Oct
JetBlue Logo
3:45 p.m. - 10:38 p.m.
DCA
-
SEA
9h 53m
1 stop
JetBlue Logo
11:55 p.m. - 11:20 a.m.
SEA
-
DCA
8h 25m
1 stop
C$ 456JetBlue
Sat, 29 Aug - Wed, 2 Sep
Alaska Airlines Logo
5:00 p.m. - 7:51 p.m.
DCA
-
SEA
5h 51mdirect
Alaska Airlines Logo
7:40 a.m. - 9:00 p.m.
SEA
-
DCA
10h 20m
1 stop
C$ 459Alaska Airlines
Mon, 27 Jul - Mon, 3 Aug
Southwest Logo
7:05 p.m. - 12:35 a.m.
DCA
-
SEA
8h 30m
1 stop
Southwest Logo
11:05 p.m. - 11:25 a.m.
SEA
-
DCA
9h 20m
1 stop
C$ 466Southwest
Mon, 24 Aug - Fri, 28 Aug
Southwest Logo
4:55 p.m. - 12:40 a.m.
DCA
-
SEA
10h 45m
2 stops
Southwest Logo
5:15 a.m. - 4:50 p.m.
SEA
-
DCA
8h 35m
1 stop
C$ 467Southwest
Tue, 18 Aug - Sat, 22 Aug
Southwest Logo
6:40 p.m. - 11:35 p.m.
DCA
-
SEA
7h 55m
1 stop
Southwest Logo
5:30 a.m. - 8:05 p.m.
SEA
-
DCA
11h 35m
2 stops
C$ 473Southwest
Fri, 14 Aug - Sun, 23 Aug
Southwest Logo
4:35 p.m. - 12:20 a.m.
DCA
-
SEA
10h 45m
1 stop
Southwest Logo
9:25 p.m. - 2:50 p.m.
SEA
-
DCA
14h 25m
2 stops
C$ 476Southwest
Sat, 4 Jul - Sat, 11 Jul
Southwest Logo
6:10 a.m. - 3:55 p.m.
DCA
-
SEA
12h 45m
2 stops
Southwest Logo
5:00 a.m. - 7:00 p.m.
SEA
-
DCA
11h 00m
2 stops
C$ 480Southwest
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Seattle flights

Get data-powered insights and trends into flights from Washington, D.C. to Seattle to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Washington, D.C. Reagan-National Airport to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Reagan-National Airport to Seattle departing in July.

What is the cheapest month to fly from Washington, D.C. Reagan-National Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Reagan-National Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Reagan-National Airport to Seattle is February, where tickets cost C$ 408 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is C$ 760 and C$ 736 respectively.

Can I save money by flying with a layover from Washington, D.C. Reagan-National Airport to Seattle?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of C$ 249, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Washington, D.C. Reagan-National Airport to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Reagan-National Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. Reagan-National Airport to Seattle, you should book around 4 weeks before departure, which saves you about 36% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Expert advice

Expert advice for your flight from Washington, D.C. to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on DCA

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Harriet Baskas

Harriet Baskas

Expert on SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flightC$ 220
Best time to beat the crowds (27% less expensive on average)
Most popular time to fly (21% more expensive on average)
Flight from Washington, D.C. to Seattle

When to book flights from Washington, D.C. to Seattle

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Washington, D.C. to Seattle: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Washington, D.C. to Seattle 
NguyenFlew with Delta
DCA
-
SEA
Dec 2025
DCA airport is much easier to navigate (security, getting to gate, proximity to DC city center) than IAD
ManojFlew with Alaska Airlines
DCA
-
SEA
Nov 2025
Don’t bring carry on roller luggage if you can avoid it. Overhead space runs out real quick.
PaulFlew with Alaska Airlines
DCA
-
SEA
Jun 2024
It's pricier to fly into Reagan (DCA), but if your destination is core DC area, it is well worth it. I used Ubers and Metro; no need to rent a car.
Verified travelerFlew with Alaska Airlines
DCA
-
SEA
Jul 2024
Be prepared Seattle is a mess as far as the overwhelming crowds when you land . The bus line to get your rental car is unbelievably long almost 100 people so be prepared once you arrive .

FAQs for booking Washington, D.C. to Seattle flights

  • What is the cheapest flight from Washington, D.C. Reagan-National Airport to Seattle?

    In the last 5 days, the lowest price for a flight from Washington, D.C. Reagan-National Airport to Seattle was C$ 220 for a one-way ticket and C$ 445 for a round-trip.

  • Which airlines offer Wi-Fi service onboard planes from Washington, D.C. to Seattle?

    Alaska Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Washington, D.C. to Seattle flight route.

  • Which aircraft models fly most regularly from Washington, D.C. to Seattle?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Washington, D.C. to Seattle flight route.

  • On which days can I fly direct from Washington, D.C. to Seattle?

    There are direct flights from Washington, D.C. to Seattle on a daily basis.

  • How does KAYAK find such low prices on flights from Washington, D.C. to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington, D.C. to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington, D.C. to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Washington, D.C. is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington, D.C. to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Washington, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from Washington, D.C. to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Reagan-National to Seattle/Tacoma Intl.
Find which airlines fly direct from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Reagan-National to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta

Alaska Airlines,Delta

Tuesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Wednesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Thursday

Alaska Airlines,Delta

Alaska Airlines,Delta

Friday

Alaska Airlines,Delta

Alaska Airlines,Delta

Saturday

Alaska Airlines,Delta

Alaska Airlines,Delta

Sunday

Alaska Airlines,Delta

Alaska Airlines,Delta

See more nonstop flights

Direct returns

Seattle/Tacoma Intl to Washington, D.C. Reagan-National

Monday

Alaska Airlines,Delta

Alaska Airlines,Delta

Tuesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Wednesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Thursday

Alaska Airlines,Delta

Alaska Airlines,Delta

Friday

Alaska Airlines,Delta

Alaska Airlines,Delta

Saturday

Alaska Airlines,Delta

Alaska Airlines,Delta

Sunday

Alaska Airlines,Delta

Alaska Airlines,Delta

See more nonstop flights

Everything you need to know for your flight from Washington, D.C. to Seattle

Information on your arrival and departure airports