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IAD - SEA

Find cheap flights from Washington, D.C. to Seattle from £111

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 4/6. 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.
1 adult
0 bags
Fri 31/5
Fri 7/6

Search 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
In the last 7 days, travellers have searched 43,740,974 times on KAYAK, and here's why:

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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 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 and deals for you by selecting your travel dates.
Choose your dates
07:00 - 09:30IAD-SEA
5h 30mdirect
16:00 - 23:59SEA-IAD
4h 59mdirect
£221Alaska Airlines
Find Deal
Tue, 4 Jun - Wed, 5 Jun
07:00 - 09:30IAD-SEA
5h 30mdirect
23:28 - 07:40SEA-IAD
5h 12mdirect
£226Alaska Airlines
Find Deal
Wed, 29 May - Sun, 2 Jun
19:20 - 17:10IAD-SEA
24h 50m1 stop
23:59 - 16:31SEA-IAD
13h 32m1 stop
£228Sun Country Air
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Fri, 24 May - Sun, 2 Jun
16:19 - 20:14IAD-SEA
30h 55m1 stop
23:28 - 07:40SEA-IAD
5h 12mdirect
£229Alaska Airlines
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Wed, 29 May - Thu, 30 May
17:40 - 20:27IAD-SEA
5h 47mdirect
08:35 - 16:45SEA-IAD
5h 10mdirect
£234Delta
Find Deal
Sat, 1 Jun - Tue, 4 Jun
12:30 - 07:55IAD-SEA
22h 25m1 stop
23:59 - 13:02SEA-IAD
10h 03m1 stop
£236Sun Country Air
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Sun, 26 May - Mon, 27 May
07:31 - 10:20IAD-SEA
5h 49mdirect
22:22 - 06:26SEA-IAD
5h 04mdirect
£239Delta
Find Deal
Sat, 1 Jun - Sat, 1 Jun
19:20 - 07:40IAD-SEA
15h 20m1 stop
16:00 - 23:59SEA-IAD
4h 59mdirect
Fri, 24 May - Thu, 30 May
22:15 - 00:59IAD-SEA
5h 44mdirect
23:59 - 09:55SEA-IAD
6h 56m1 stop
£345United Airlines
Find Deal
Fri, 24 May - Mon, 27 May
22:15 - 00:59IAD-SEA
5h 44mdirect
23:35 - 07:34SEA-IAD
4h 59mdirect
£358United Airlines
Find Deal
Sat, 22 Jun - Mon, 1 Jul

Flights from Washington, D.C. to Seattle - Travel Insights & Trends

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 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 January, where tickets cost £205 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is £469 and £430 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Seattle, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 26 days before departure.

Which airlines provide the cheapest flights from Washington, D.C. to Seattle?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the best return deals on flights connecting Washington, D.C. to Seattle were found on Alaska Airlines (£221) and Sun Country Air (£228). Alaska Airlines proposed the cheapest one-way flight at £111.

Which airlines fly most frequently between Washington, D.C. and Seattle?

In normal times, Alaska Airlines flies from Washington, D.C. to Seattle up to 6 times per day, United Airlines up to 5 times per day, and Delta up to 2 times per day.

How many flights are there between Washington, D.C. Dulles Intl Airport and Seattle per day?

Each day, there are between 12 and 15 nonstop flights that take off from Washington, D.C. Dulles Intl Airport and land in Seattle, with an average flight time of 5h 42m. The most common departure time is 17:00 and most flights take off in the morning. Each week, there are 95 flights. The most frequent day of departure is Saturday, when 16% of all weekly flights depart. The fewest flights depart on a Tuesday.

Which cabin class options are there for flights between Washington, D.C. Dulles Intl Airport and Seattle?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There are 2 cabin class options for the route. These are Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Washington, D.C. to Seattle take?

Direct flights from Washington, D.C. generally make it to Seattle in 5h 30m. The flying distance between the two cities is 2,299 miles.

What’s the earliest departure time from Washington, D.C. to Seattle?

Early birds can take the earliest flight from Washington, D.C. Dulles Intl Airport at 07:00 and will be landing in Seattle at 09:30.

What’s the latest departure time from Washington, D.C. to Seattle?

If you prefer to fly at night, the latest flight from Washington, D.C. Dulles Intl Airport to Seattle jets off at 22:15 and lands at 00:59.

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

Low season

January

High season

August

Cheapest flight

£111
Best time to beat the crowds (36% less expensive on average)
Most popular time to fly (5% 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.

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 £139 for a one-way ticket and £277 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, American Airlines, Delta, and JetBlue 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 MAX 9 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

Top tips for finding a cheap flight from Washington, D.C. to Seattle

  • Looking for a cheap flight from Seattle to Washington, D.C.? 25% of our users found flights on this route for Seattle or less round-trip.
  • 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 Dulles Intl to Seattle/Tacoma Intl, 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, Austrian Airlines, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

Tuesday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Wednesday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

Thursday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Friday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

Saturday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Sunday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

See more direct flights

Direct returns

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

Monday

ANA, Air Tahiti Nui, Alaska Airlines, +13 more

ANA, Air Tahiti Nui, +14 more

Tuesday

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

ANA, Air Tahiti Nui, +16 more

Wednesday

ANA, Air Tahiti Nui, Alaska Airlines, +13 more

ANA, Air Tahiti Nui, +14 more

Thursday

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

ANA, Air Tahiti Nui, +16 more

Friday

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

ANA, Air Tahiti Nui, +15 more

Saturday

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

ANA, Air Tahiti Nui, +16 more

Sunday

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

ANA, Air Tahiti Nui, +15 more

See more direct flights
See more direct flights

Book cheap flights from Washington, D.C. to Seattle

Cheapest flights to Seattle from Washington, D.C. found in 2024

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Washington, D.C. to Seattle found on KAYAK in the last 72 hours.
4/6Tue
directAlaska Airlines
5h 30mIAD-SEA
£111
29/5Wed
directDelta
5h 45mIAD-SEA
£115
31/5Fri
directAlaska Airlines
5h 30mIAD-SEA
£116
26/5Sun
directDelta
5h 45mIAD-SEA
£120
22/7Mon
1 stopSun Country Air
24h 54mIAD-SEA
£122
4/6Tue
1 stopAlaska Airlines
8h 54mIAD-SEA
£127
30/5Thu
1 stopAlaska Airlines
8h 54mIAD-SEA
£128
26/5Sun
1 stopSun Country Air
22h 25mIAD-SEA
£130
28/5Tue
directUnited Airlines
5h 47mIAD-SEA
£155
15/8Thu
directUnited Airlines
5h 44mIAD-SEA
£156

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Last minute flights from Washington, D.C. to Seattle

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Washington, D.C. to Seattle that are departing in the next 10 days.
4/5Sat
directDelta
5h 53mIAD-SEA
14/5Tue
directDelta
5h 03mSEA-IAD
£485
4/5Sat
multi-stopDelta
7h 32mIAD-SEA
14/5Tue
directDelta
5h 03mSEA-IAD
£493
4/5Sat
directDelta
5h 53mIAD-SEA
13/5Mon
multi-stopDelta
7h 25mSEA-IAD
£524
4/5Sat
multi-stopDelta
7h 32mIAD-SEA
13/5Mon
multi-stopDelta
7h 25mSEA-IAD
£532
3/5Fri
directAlaska Airlines
5h 51mIAD-SEA
9/5Thu
directAlaska Airlines
5h 04mSEA-IAD
£553
6/5Mon
directDelta
5h 53mIAD-SEA
12/5Sun
directDelta
5h 03mSEA-IAD
£556
4/5Sat
directAlaska Airlines
5h 40mIAD-SEA
11/5Sat
multi-stopAlaska Airlines
10h 32mSEA-IAD
£560
6/5Mon
multi-stopDelta
10h 16mIAD-SEA
11/5Sat
directDelta
5h 09mSEA-IAD
£564
2/5Thu
directUnited Airlines
5h 48mIAD-SEA
7/5Tue
multi-stopUnited Airlines
19h 45mSEA-IAD
£603
3/5Fri
multi-stopAlaska Airlines
10h 17mIAD-SEA
3/5Fri
multi-stopAlaska Airlines
9h 26mSEA-IAD
£607

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Washington, D.C. - Seattle Flights

Departure:

Washington, D.C. (IAD)United States

Destination:

Seattle (SEA)United States

Cabin classes:

£383

Browse origins:

  • Flights » 
  • Washington Dulles Airport

Browse destinations:

  • Flights » 
  • Worldwide » 
  • Seattle