SEA - WAS

C$ 178 Find Cheap Flights from Seattle to Washington, D.C.

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Washington, D.C. departing on 21/5. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C.

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Washington, D.C., 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 Seattle to Washington, D.C., as well as popular online travel agencies
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Cheap Flight Deals from Seattle to Washington, D.C. (SEA-WAS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Washington, D.C. 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.

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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Washington, D.C..
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Frontier Logo
6:00 a.m. - 12:07 p.m.SEA-DCA
27h 07m1 stop
Frontier Logo
7:00 a.m. - 12:44 a.m.DCA-SEA
20h 44m1 stop
C$ 289Frontier
Find Deal
Sun, 4 May - Thu, 8 May
Hawaiian Airlines Logo
1:48 p.m. - 9:59 p.m.SEA-DCA
5h 11mdirect
Hawaiian Airlines Logo
8:00 a.m. - 10:39 a.m.DCA-SEA
5h 39mdirect
C$ 347Hawaiian Airlines
Find Deal
Tue, 3 Jun - Wed, 4 Jun
Delta Logo
7:35 a.m. - 3:49 p.m.SEA-DCA
5h 14mdirect
Delta Logo
4:40 p.m. - 7:38 p.m.DCA-SEA
5h 58mdirect
C$ 355Delta
Find Deal
Sat, 7 Jun - Tue, 10 Jun
Delta Logo
9:50 p.m. - 5:52 a.m.SEA-IAD
5h 02mdirect
Delta Logo
7:40 a.m. - 10:28 a.m.IAD-SEA
5h 48mdirect
C$ 355Delta
Find Deal
Sat, 7 Jun - Tue, 10 Jun
Alaska Airlines Logo
8:25 a.m. - 9:05 p.m.SEA-DCA
9h 40m1 stop
Alaska Airlines Logo
5:00 p.m. - 7:56 p.m.DCA-SEA
5h 56mdirect
C$ 369Alaska Airlines
Find Deal
Tue, 20 May - Tue, 27 May
Alaska Airlines Logo
11:30 p.m. - 7:36 a.m.SEA-IAD
5h 06mdirect
Alaska Airlines Logo
7:15 a.m. - 1:44 p.m.IAD-SEA
9h 29m1 stop
C$ 369Alaska Airlines
Find Deal
Sat, 7 Jun - Tue, 10 Jun
United Airlines Logo
11:59 p.m. - 9:58 a.m.SEA-DCA
6h 59m1 stop
United Airlines Logo
1:00 p.m. - 6:53 p.m.DCA-SEA
8h 53m1 stop
C$ 383United Airlines
Find Deal
Tue, 20 May - Tue, 27 May
United Airlines Logo
12:55 p.m. - 9:03 p.m.SEA-IAD
5h 08mdirect
United Airlines Logo
5:48 p.m. - 8:41 p.m.IAD-SEA
5h 53mdirect
C$ 393United Airlines
Find Deal
Sat, 17 May - Sat, 24 May
Sun Country Air Logo
11:55 p.m. - 12:33 p.m.SEA-IAD
9h 38m1 stop
Sun Country Air Logo
11:24 a.m. - 10:58 a.m.IAD-SEA
26h 34m1 stop
C$ 456Sun Country Air
Find Deal
Thu, 28 Aug - Mon, 1 Sep
Sun Country Air Logo
6:36 p.m. - 12:25 p.m.SEA-IAD
14h 49m1 stop
Sun Country Air Logo
7:45 a.m. - 10:50 p.m.IAD-SEA
18h 05m1 stop
C$ 470Sun Country Air
Find Deal
Thu, 12 Jun - Sun, 15 Jun

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

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are specific to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

Opt for Economy Plus for 15 cm more legroom than standard economy seats.


Purchase Priority Boarding to ensure overhead bin space, placing you in Zone 2.

Alaska Airlines

Alaska's 20-minute baggage guarantee offers a discount or 2,500 miles if delayed.


Enjoy free wine tastings in Washington with your boarding pass and Mileage Plan membership.

Airports
SEA

Use the SEA Spot Saver for expedited security screening without a paid program. Book online or via the flySEA app.

Read more about SEAby Harriet Baskas
IAD

The Silver Line Metro connects IAD to downtown D.C. in about 50 minutes, offering a convenient and cost-effective option.

Read more about IADby Stefanie Waldek
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and SEA

Harriet Baskas

Harriet Baskas

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.

Read more

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

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

What is the cheapest Seattle to Washington, D.C. flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Seattle to Washington, D.C..
Our data shows that the cheapest route for a return flight from Seattle to Washington, D.C. cost C$ 264 and was between Seattle (SEA) and Washington, D.C. Dulles Intl Airport (IAD). On average, the best prices are found if you fly from Seattle (SEA) to Baltimore (BWI). The average price for a return flight for this route is C$ 264.

What’s the cheapest day of the week to fly from Seattle to Washington, D.C.?

The average price of all round-trip flights from Seattle to Washington, D.C. clicked on KAYAK for each day over the last 12 months.
When flying from Seattle to Washington, D.C., you should consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Thursdays and the most expensive ones on Saturdays.

What is the cheapest month to fly from Seattle to Washington, D.C.?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Washington, D.C., 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 Seattle to Washington, D.C. is September, where tickets cost C$ 445 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is C$ 709 and C$ 672 respectively.

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

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$ 772, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Washington, D.C., 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 Seattle to Washington, D.C., you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low season

February

High season

April

Cheapest flight

C$ 178
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly and prices are also 3% lower on average.
Flight from Seattle to Reagan Washington National Airport

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

Are your dates flexible? Find out the best times to travel from Seattle to Washington, D.C. 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 Seattle to Washington, D.C.: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Seattle to Washington, D.C. 
StacieFlew with Alaska AirlinesSEA-IADJun 2024
Watch your dates that you book. Don’t forget about the Alaska cruises. Sunday everyone flying home after cruise. Flights booked!
Verified travelerFlew with Alaska AirlinesSEA-IADMay 2024
Fly a larger carrier with the usual amenities: Delta, United, American.

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

  • What is the cheapest flight from Seattle to Washington, D.C.?

    In the last 3 days, the lowest price for a flight from Seattle to Washington, D.C. was C$ 129 for a one-way ticket and C$ 209 for a round-trip.

  • Which airports will I be using when flying from Seattle to Washington, D.C.?

    On your way to Washington, D.C., you’ll fly out from Seattle/Tacoma Intl. You’ll be landing in one of Washington, D.C.’s 2 airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

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

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

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

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

  • Which airline alliances offer flights from Seattle to Washington, D.C.?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Seattle and Washington, D.C., with Star Alliance being the most commonly used for this route.

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

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

  • Which is the best airline for flights from Seattle to Washington, D.C., Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Seattle to Washington, D.C. are Alaska Airlines and Delta. With an average price for the route of C$ 440 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of C$ 334 and an overall rating of 8.0.

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

    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 Seattle to Washington, D.C..

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

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

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

    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 Washington, D.C. with an airline and back to Seattle with another airline.

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

    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 Washington, D.C. from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Seattle to Washington, D.C.

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 331 or less one-way and C$ 396 or less round-trip.

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

Find which airlines fly direct from Seattle/Tacoma Intl Airport to Washington, D.C., which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to Washington, D.C.

Monday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Tuesday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Wednesday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Thursday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Friday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Saturday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Sunday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

See more nonstop flights

Direct returns

Washington, D.C. to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Tuesday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Wednesday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Thursday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Friday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Saturday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

Sunday

Alaska Airlines,Delta,United Airlines

Alaska Airlines,Delta, +1 more

See more nonstop flights
See more nonstop flights

Top airlines flying from Seattle to Washington, D.C.

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Washington, D.C.? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9911 reviews
7.9Comfort
7.1Entertainment
8.2Boarding
8.5Crew
7.1Food
Airline reviews

An uneventful flight is a good experience although one of the pilots gauges wasn’t working right so we had a half hour delay—no one can foresee that.

10.0 ExcellentAldo, Apr 2025SEA - TPA
Read more Alaska Airlines reviews

An uneventful flight is a good experience although one of the pilots gauges wasn’t working right so we had a half hour delay—no one can foresee that.

Plane was delayed and got me in past bedtime. But more importantly, my tsa precheck number wasn’t on my ticket so had to deal with the general line. Oh well, guess the delay helped that situation.

It was as good as flying can be, which is still very uncomfortable. Clean new aircraft, great crew.

Everything was good. The flight attendants were great. I was disappointed that there wasn’t any screens on the back of the seats to watch movies, tv, etc. I only had my phone to watch movies on.

Flight delayed due to engine issue. For 3+ hours still not on flight

Could have had more of a beverage selection than water and apple juice.

They only had one flight to my destination for the entire day. Six hour layover. Coming from their sister airline we didn't have any boarding grouping on our boarding tickets. Had to ask where we were within the grouping.

Flight was over an hour late, and we got notified every 15 minutes, beginning right at boarding, that it would only be 15 more minutes until we finally left about 75 minutes late. Of course, no compensation was offered.

Just in first class they offer blanquets, for main cabin there was no blanquets even if I would buy them

The flight was delayed and then it was very short. The crew was nice. The seats weren't as comfortable on this particular craft.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

The Dekta Rep that checked us in was great. She's very personable, pleasant, and can tell she enjoys her job.

The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.

Terrible and im avoiding them in the future. My initial flight was delayed causing me to rebook my flight and when speaking with the representative to rebook I explained this is the second time my flights were delayed and they did nothing to help me. I wasn't booked to comfort plus or given a voucher or anything. I was almost late for my meeting that I needed to attend on Monday because of the games delta played delaying my flights even more and putting me in the very back of the plane next to an extremely intoxicated passenger

Flights on time. .Ride was as comfortable as can be expected in steerage. Luggage arrived at destination. Attendants were fairly friendly.

Great staff. Wifi is terrible. Signing up for skylines is a painstaking process. Had to call customer service just to get my flight itinerary and confirmation sent to me. Consistent delays. A well staffed company that is run so poorly. Upper management needs to be renewed.

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

Information on your arrival and departure airports

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