IAD - SEA

£96 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 3/6. 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.
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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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Cheap Flight Deals from Washington, D.C. to Seattle (IAD-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return 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.

Recent return flight deals from Washington, D.C. to Seattle

KAYAK's recommended return flight deals from the most popular airlines that fly from Washington, D.C. to Seattle.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Alaska Airlines Logo
06:30 - 09:17IAD-SEA
5h 47mdirect
Alaska Airlines Logo
09:15 - 17:13SEA-IAD
4h 58mdirect
£126Alaska Airlines
Find Deal
Tue, 1 Jul - Tue, 8 Jul
Delta Logo
07:45 - 10:33IAD-SEA
5h 48mdirect
Delta Logo
21:55 - 05:59SEA-IAD
5h 04mdirect
£192Delta
Find Deal
Tue, 3 Jun - Tue, 10 Jun
Hawaiian Airlines Logo
06:30 - 09:13IAD-SEA
5h 43mdirect
Hawaiian Airlines Logo
23:30 - 07:36SEA-IAD
5h 06mdirect
£203Hawaiian Airlines
Find Deal
Wed, 14 May - Mon, 19 May
United Airlines Logo
15:30 - 21:57IAD-SEA
9h 27m1 stop
United Airlines Logo
05:15 - 15:36SEA-IAD
7h 21m1 stop
£207United Airlines
Find Deal
Wed, 14 May - Tue, 20 May
United Airlines Logo
17:26 - 20:18IAD-SEA
5h 52mdirect
United Airlines Logo
12:55 - 21:02SEA-IAD
5h 07mdirect
£218United Airlines
Find Deal
Tue, 20 May - Tue, 27 May
Hawaiian Airlines Logo
06:30 - 09:10IAD-SEA
5h 40mdirect
Hawaiian Airlines Logo
23:30 - 07:27SEA-IAD
4h 57mdirect
£237Hawaiian Airlines
Find Deal
Wed, 11 Jun - Wed, 25 Jun
Sun Country Air Logo
12:28 - 22:50IAD-SEA
13h 22m1 stop
Sun Country Air Logo
23:59 - 12:29SEA-IAD
9h 30m1 stop
£258Sun Country Air
Find Deal
Mon, 30 Jun - Thu, 17 Jul
Sun Country Air Logo
12:46 - 22:50IAD-SEA
13h 04m1 stop
Sun Country Air Logo
23:59 - 11:43SEA-IAD
8h 44m1 stop
£265Sun Country Air
Find Deal
Sat, 19 Jul - Fri, 25 Jul
Southwest Logo
05:45 - 15:10IAD-SEA
12h 25m2 stops
Southwest Logo
05:00 - 15:00SEA-IAD
7h 00m1 stop
£270Southwest
Find Deal
Tue, 19 Aug - Sat, 23 Aug
Southwest Logo
07:00 - 21:30IAD-SEA
17h 30m2 stops
Southwest Logo
06:45 - 22:05SEA-IAD
12h 20m2 stops
£279Southwest
Find Deal
Sat, 13 Sep - Wed, 17 Sep

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

 
Snippets provided in this section are AI-generated based on a summarisation 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
Alaska Airlines

Alaska's Premium Class offers priority boarding and complimentary drinks on flights over 350 miles.


Alaska's 20-minute baggage guarantee offers a discount or miles if bags are late.

Delta

Delta's Comfort Plus seats offer up to 3 inches extra legroom compared to Main Cabin.


Free Wi-Fi for SkyMiles members on domestic flights; sign up onboard if needed.

Read more about Deltaby Stefanie Waldek
United Airlines

United's Economy Plus offers up to 6 inches more legroom than standard economy seats.


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

Airports
IAD

Check the airport map before arriving at IAD to plan your route from check-in to gate, especially during busy evening departures.

Read more about IADby Stefanie Waldek
SEA

Use the Link light rail for a cost-effective 40-minute trip from SEA to downtown Seattle, avoiding high ride-hailing fares.

Read more about SEAby Harriet Baskas
Our travel experts
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, 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
Stefanie Waldek

Stefanie Waldek

Expert on Delta, 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 out at sea, likely en route to Antarctica or the Arctic.

Read more

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.

What is the cheapest month to fly from Washington, D.C. Dulles Intl 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. Dulles Intl 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. Dulles Intl Airport to Seattle is February, where tickets cost £259 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is £386 and £362 respectively.

Can I save money by flying with a stopover from Washington, D.C. Dulles Intl Airport to Seattle?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.
Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £512 on average.

How far in advance should I book a flight from Washington, D.C. Dulles Intl 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. Dulles Intl 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. Dulles Intl Airport to Seattle, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know - Cheap tickets from Washington, D.C. to Seattle

Low season

February

High season

July

Cheapest flight

£96
Best time to beat the crowds (17% less expensive on average)
Most popular time to fly (15% 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 return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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 
Verified travelerFlew with Alaska AirlinesIAD-SEASept 2024
Pay the money if can afford to upgrade your seats
Verified travelerFlew with Alaska AirlinesIAD-SEAJul 2024
Dulles, like Seattle has a tram. That can be surprising. The TSA at Seattle is notoriously LONG, however, both times in the last year that I have flown, that has not been the case. At Dulles, the TSA lines were efficient as well. The airport interior is well marked for getting around. I did note that the garbages were full in the Southwest and Alaska areas- as we were there 6 hours and had lots of time to notice nit-picky things that nobody else would care about :). It was convenient to have a "charging station" nearby the Alaska waiting area (right across from our gate). It had 3 ports, and I noticed that as soon as I unplugged mine, it was jumped right on. Suggestion- have Dulles add a few more for passengers who need to recharge phones. Great experience, thank you.
MarylinFlew with DeltaIAD-SEAMar 2024
Delta by far is a great airline, they’re fast and great staff. I just wish they had a little more snacks
Verified travelerFlew with Alaska AirlinesIAD-SEAMay 2024
Get to the airport early, especially on holidays

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

  • How can I get from the Sea-Tac Airport (SEA) to my hotel in downtown Seattle?

    There are a few options to get you from the airport to your hotel in downtown Seattle. One option is the subway system that picks up passengers on the 4th floor of the parking garage. There are a couple of bus services at the Sea-Tac Airport. King County Metro travels to various parts of the city of Seattle while Sound Transit takes passengers to the outlining cities of Bellevue and Renton. The buses pick up by the subway station.

  • Where can I park my car long-term at the Washington Dulles Airport?

    Very close to the terminal, there is a parking garage and a terminal parking lot. There is also an economy lot a little further away. A shuttle service will take you from the economy lot to the main terminal of the airport.

  • What restaurants are at the Washington Dulles Airport?

    There are a couple of bars, a pizzeria, and a burger place where you can dine. Some well-known restaurants in this airport include Auntie Anne's, Carrabba's Italian Grill, Chick-Fil-A, and Jersey Mike's Subs.

  • What lounges are at these two airports?

    Both airports have lounges where you can enjoy some quiet time. These lounges also offer complimentary drinks and snacks. They are sponsored by airlines, credit card companies, or the airport. At the Washington Dulles Airport, there is a United Airlines, British Airways, and an Air France lounge. The Sea-Tac Airport has lounges affiliated with United Airlines, American Express, Delta Airlines, and Alaska Airlines.

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Seattle was £129 for a one-way ticket and £169 for a return.

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

    On your way to Seattle, you’ll fly out from Washington, D.C. Dulles Intl. You’ll be landing at Seattle/Tacoma Intl.

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

    Alaska Airlines, Hawaiian 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.

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

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

See more FAQs

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

  • You can book a nonstop flight from Washington Dulles Airport (IAD) to the Seattle-Tacoma International Airport (SEA). However, there are some flight routes that will require you to switch planes in either Salt Lake City, Dallas-Fort Worth, or San Francisco.
  • The Washington Dulles International Airport (IAD) has a simple layout. It has one main terminal that connects to four concourses from which departure and arrival flights are managed. To assist passengers with getting around, the airport is equipped with moving walkways, escalators, and elevators. It also has a people mover system that is known as the AeroTrain, it goes from one side of the airport to another.
  • The SEA underground makes it easy to get around the Seattle-Tacoma International Airport (SEA). This is a people mover system or tram that goes around the airport including the main terminal, the north terminal, the south terminal, and the four concourses.
  • There is lots to do and see at the Seattle-Tacoma International Airport. You can explore African culture in the Africa Lounge. Here you can enjoy African-inspired drinks and food. Throughout the year, the airport hosts live musical concerts. These concerts take place in the central terminal, in front of Sub Pop Records, and close to the children's play area.
  • Numerous rental car agencies have offices at the Sea-Tac Airport. This includes Budget, Dollar, Hertz, and Thrifty just to name a few. The rental car center is located offsite. However, there is a shuttle bus that will take you from the airport to the car rental lot.
See more tips

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

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

Direct departures

Washington, D.C. Dulles Intl to Seattle/Tacoma Intl

Monday

Air Tahiti Nui, Alaska Airlines, American Airlines, +14 more

Air Tahiti Nui, Alaska Airlines, +15 more

Tuesday

Air Tahiti Nui, Alaska Airlines, American Airlines, +14 more

Air Tahiti Nui, Alaska Airlines, +15 more

Wednesday

Air Tahiti Nui, Alaska Airlines, American Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

Thursday

Air Tahiti Nui, Alaska Airlines, American Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

Friday

Air Tahiti Nui, Alaska Airlines, American Airlines, +14 more

Air Tahiti Nui, Alaska Airlines, +15 more

Saturday

Air Tahiti Nui, Alaska Airlines, American Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

Sunday

Air Tahiti Nui, Alaska Airlines, American Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to Washington, D.C. Dulles Intl

Monday

ANA, Air Tahiti Nui, Alaska Airlines, +14 more

ANA, Air Tahiti Nui, +15 more

Tuesday

ANA, Air Tahiti Nui, Alaska Airlines, +15 more

ANA, Air Tahiti Nui, +16 more

Wednesday

ANA, Air Tahiti Nui, Alaska Airlines, +14 more

ANA, Air Tahiti Nui, +15 more

Thursday

ANA, Air Tahiti Nui, Alaska Airlines, +15 more

ANA, Air Tahiti Nui, +16 more

Friday

ANA, Air Tahiti Nui, Alaska Airlines, +15 more

ANA, Air Tahiti Nui, +16 more

Saturday

ANA, Air Tahiti Nui, Alaska Airlines, +15 more

ANA, Air Tahiti Nui, +16 more

Sunday

ANA, Air Tahiti Nui, Alaska Airlines, +15 more

ANA, Air Tahiti Nui, +16 more

See more direct flights
See more direct flights

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

Information on your arrival and departure airports

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