WAS - SEA

$104 Find Cheap Flights from Washington, D.C. to Seattle - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$292
Typical prices: $344-$595
United Airlines
Tue 1/23Fri 1/26
IAD - SEA • 1 stop
Cheapest non-stop
$297
Typical prices: $349-$610
Delta
Wed 12/19Wed 1/3
IAD - SEA • Non-stop
Advice from real travelers
Delta Comfort Plus adds legroom; United Economy Plus offers up to six inches more.
Delta has free Wi-Fi; Alaska Premium Class adds priority boarding and drinks.
Expert advice
+1
Expert advice
+1
Nonstop flights
You can fly direct with Alaska Airlines, Delta and United Airlines. Average duration is 6h 01m
Direct flights
+1
Direct flights
+1
Top routes
Cheapest • 2% average savings
Most popular
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 12 weeks in advance save around 50% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 41% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg $354 (round-trip)
Shortest trip • 7h 32m (one-way)
Insights
Insights
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We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Sat, Jan 23 - Tue, Jan 26
United Airlines Logo
3:15 pm - 9:59 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
9h 44m1 stop Los Angeles
United Airlines Logo
8:30 am - 7:31 pmSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
8h 01m1 stop Denver Intl
$292United Airlines
Sat, Jan 9 - Mon, Jan 11
United Airlines Logo
3:15 pm - 9:59 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
9h 44m1 stop Los Angeles
United Airlines Logo
8:30 am - 7:31 pmSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
8h 01m1 stop Denver Intl
$292United Airlines
Wed, Oct 28 - Sun, Nov 1
Frontier Logo
12:31 pm - 9:45 amIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
24h 14m2 stops Dallas/Fort Worth Las Vegas Harry Reid Intl
Frontier Logo
10:50 am - 11:36 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
21h 46m2 stops Ontario Dallas/Fort Worth
$293Frontier
Thu, Nov 12 - Wed, Nov 18
Frontier Logo
6:00 pm - 3:12 pmDCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
24h 12m1 stop Denver Intl
Frontier Logo
4:27 pm - 12:09 pmSEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
16h 42m1 stop Denver Intl
$293Frontier
Thu, Nov 5 - Mon, Nov 9
Delta Logo
12:30 pm - 8:09 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
10h 39m1 stop New York John F Kennedy Intl
Delta Logo
11:40 pm - 11:37 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
8h 57m1 stop Atlanta Hartsfield-Jackson
$297Delta
Thu, Nov 5 - Sun, Nov 8
Delta Logo
12:30 pm - 8:09 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
10h 39m1 stop New York John F Kennedy Intl
Delta Logo
11:18 pm - 11:52 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
9h 34m1 stop New York John F Kennedy Intl
$297Delta
Tue, Nov 10 - Sun, Nov 15
American Airlines Logo
7:18 am - 1:15 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
8h 57m1 stop Dallas/Fort Worth
American Airlines Logo
9:45 pm - 10:11 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
9h 26m1 stop Charlotte Douglas
$297American Airlines
Fri, Oct 30 - Tue, Nov 3
American Airlines Logo
6:15 am - 12:18 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
9h 03m1 stop Charlotte Douglas
American Airlines Logo
9:45 pm - 10:11 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
9h 26m1 stop Charlotte Douglas
$297American Airlines
Fri, Feb 5 - Mon, Feb 8
Southwest Logo
4:55 pm - 12:20 amDCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
10h 25m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:30 am - 4:55 pmSEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
8h 25m1 stop Chicago Midway
$297Southwest
Sat, Nov 21 - Fri, Nov 27
Southwest Logo
6:40 pm - 12:45 amDCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
9h 05m1 stop Chicago Midway
Southwest Logo
5:30 am - 3:15 pmSEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
6h 45m1 stop Chicago Midway
$297Southwest
Booking Insights

Price, demand and travel trends for Washington, D.C. to Seattle flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

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

Round-trip flights from Washington, D.C. to Seattle typically range from $344 to $595. The lowest price found in the past 5 days was $292, on United Airlines.

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

There's little price difference between Washington, D.C. to Seattle routes. They average around $458 round-trip, based on KAYAK data over the past 12 months.

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

Based on deals KAYAK users found in the last 12 months, Wednesday is the cheapest day of the week to fly from Washington, D.C. to Seattle. It’s 7% cheaper than the average day, while Sunday is the most expensive, with prices 17% higher.

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

•January is the cheapest month to fly from Washington, D.C. to Seattle at $270 round-trip.
•July ($531) and June ($525) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 96% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from Washington, D.C. to Seattle the cheapest?

Flights from Washington, D.C. to Seattle are cheapest 12 weeks before departure. Booking in this window typically costs about 50% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Expert advice

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

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and 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.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines, Delta and IAD

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.

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.

Key details for Washington, D.C. to Seattle flights

Low season

January

Cheapest flight

$104
Beat the crowds with an average 59% drop in travelers.
The most popular month to fly with an average 114% increase in travelers.
One-way flight from Baltimore 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

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

Insights shared by verified travelers who flew the route from Washington, D.C. to Seattle 
ZacharyFlew with Alaska Airlines-Sep 2026
Loud boarding area, congested, try to get close to podium otherwise impossible to tell what boarding group is being called
Verified travelerFlew with Alaska Airlines-Jun 2026
If you have a layover in Washington DC, check out any of the Smithsonian museums which are free.
NguyenFlew with Delta-Dec 2025
DCA airport is much easier to navigate (security, getting to gate, proximity to DC city center) than IAD
ManojFlew with Alaska Airlines-Nov 2025
Don’t bring carry on roller luggage if you can avoid it. Overhead space runs out real quick.
Verified travelerFlew with Alaska Airlines-Sep 2024
Pay the money if can afford to upgrade your seats
Verified travelerFlew with Alaska Airlines-Jul 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.
PaulFlew with Alaska Airlines-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-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 .
Verified travelerFlew with Alaska Airlines-May 2024
Get to the airport early, especially on holidays

Your Washington, D.C. to Seattle flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What are the earliest and latest flights from Washington, D.C. to Seattle?

    These are the earliest and latest flight times available from Washington, D.C. to Seattle:

    • Earliest: departs at 7:00 am and lands at 1:01 pm
    • Latest: departs at 5:55 pm and lands at 11:56 pm.

    The flight takes about 6h 01m.

  • What cabin classes can I book on flights from Washington, D.C. to Seattle?

    Four cabin classes are available on flights from Washington, D.C. to Seattle:

    • Economy Class
    • Premium Economy Class
    • Business Class
    • First Class

    Prices vary by airline.

  • How long is a flight from Washington, D.C. to Seattle?

    A nonstop flight from Washington, D.C. to Seattle takes 6h 01m, covering 2,319 miles.

  • Do I need a passport to fly from Washington, D.C. to Seattle?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Washington, D.C. to Seattle flight?

    Round-trip flights from Washington, D.C. to Seattle range from $344 to $595, with an average of $454 over the past 12 months. Anything below $344 counts as a good deal.

  • How expensive are last-minute Washington, D.C. to Seattle flights?

    Last-minute fares on this route (booked within two weeks of departure) run 75% above the $454 route average. Book 12 weeks before departure for the lowest fares.

  • How much can I save by taking a layover when flying from Washington, D.C. to Seattle?

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $354 round-trip via San Diego (SAN), compared to $460 for nonstop.

  • What is the standard checked-bag allowance on flights from Washington, D.C. to Seattle?

    There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $35–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

  • How are flight departures from Washington, D.C. to Seattle spread across the day?

    Morning is the busiest departure period on Washington, D.C. to Seattle flights, with 43% of flights leaving in that window. Evening departures account for 42%, afternoon flights for 15%, and night flights for 0%.

  • Have flight prices from Washington, D.C. to Seattle changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $292 to $1,763. That means the highest observed fare was about 6x higher than the lowest one.

  • Which airlines offer Wi-Fi on Washington, D.C. to Seattle flights?

    Two airlines offer in-flight Wi-Fi on Washington, D.C. to Seattle flights:

    • Alaska Airlines
    • Delta

    Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

  • How are flight prices from Washington, D.C. to Seattle looking right now?

    One-way fares from Washington, D.C. to Seattle are currently lower than usual. Average one-way flight prices are about $119, which is 60% below the typical average for this route.

  • What car rental options are available at Seattle/Tacoma Intl Airport (SEA)?

    Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around $4 for economy cars. Top options include:

    • Fox
    • Europcar
    • Thrifty
    • Budget
    • Hertz

  • Which airports can I use when flying from Washington, D.C. to Seattle?

    Flights from Washington, D.C. to Seattle may depart from several airports in Washington, D.C. area, including Washington, D.C. Reagan-National (DCA) and Washington, D.C. Dulles Intl (IAD). Flights usually arrive at Seattle/Tacoma Intl (SEA).

  • Which airports do connecting flights from Washington, D.C. to Seattle pass through?

    One-stop flights from Washington, D.C. to Seattle most commonly connect through:

    • Chicago O'Hare Intl (ORD) - 34% of one-stop connections
    • Denver Intl (DEN) - 31% of one-stop connections
    • Chicago Midway (MDW) - 13% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 8% of one-stop connections

  • Can I save money by using flexible dates for flights from Washington, D.C. to Seattle?

    Yes. Flexible dates can save you up to 21% on flights from Washington, D.C. to Seattle. Wednesday is the cheapest departure day at $425 round-trip on average, while Sunday is the most expensive at $535, a difference of $110.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What airlines fly from Washington, D.C. to Seattle?

    3 airlines operate flights between Washington, D.C. and Seattle. The airlines offering nonstop flights on this route include:

    • Alaska Airlines
    • Delta
    • United Airlines

  • How much time can I save by choosing a different layover airport from Washington, D.C. to Seattle?

    Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 7h 32m, compared with 7h 54m via Chicago O'Hare Intl (ORD) and 7h 55m via Minneapolis St Paul (MSP).

  • What is the time difference between Washington, D.C. and Seattle?

    Seattle is 3 hours behind Washington, D.C. (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Seattle?

    Some of the most popular sights in Seattle are Pike Place Market, Lumen Field and Space Needle. These are among the most viewed places in Seattle on KAYAK.

  • Which airlines offer extra legroom and free seat selection on Washington, D.C. to Seattle flights?

    Among airlines operating Washington, D.C. to Seattle flights:

    • Alaska Airlines: offers extra legroom; offers free seat selection
    • United Airlines: offers extra legroom; offers free seat selection
    • Delta: offers extra legroom; offers free seat selection
    • American Airlines: offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • Which airlines include bags at no extra cost on Washington, D.C. to Seattle flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • Alaska Airlines: a cabin bag and a checked bag in Economy Class
    • United Airlines: a cabin bag and a checked bag in Economy Class
    • Delta: a cabin bag and a checked bag in Economy Class

    Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

  • Do all three Washington airports have a USO?

    Yes. IAD, DCA, and BWI each have a USO lounge with complimentary amenities for active-duty US service members, US military retirees, members of the National Guard, and Reservists, and all their families.

  • Do all three Washington airports have a place to pray?

    Yes. IAD provides its passengers and staff with an Inter-faith Chapel that provides a quiet place for prayer and meditation. DCA also has an Inter-faith Chapel that serves as a quiet place for reflection, meditation, and sanctuary for anyone who wants it. BWI has a Meditation Room, which is also a quiet place of reflection and sanctuary.

  • How do I get from SEA into the city center of Seattle?

    The easiest and most convenient way to get from SEA into Seattle is to take the Light Rail #1 from the Light Rail Station at SEA, which is located on the 4th floor near the Parking Garage. This train will take you to many locations throughout the Seattle metropolitan area.

  • How can I fly from each Washington airport into SEA?

    Several airlines operate non-stop flights from an airport in Washington to Seattle-Tacoma International Airport SEA. Alaska Airlines, Delta, and United Airlines are among the carriers that depart from IAD and fly non-stop to SEA. Alaska Airlines is one carrier that departs from DCA and BWI and flies non-stop to SEA. Airlines such as Delta, Frontier, and American Airlines operate flights from WAS to SEA with one stop. You can get a one-stop flight to Seattle that departs from IAD, DCA, or BWI. Some layover cities include Chicago (ORD), New York (JFK), and Detroit (DTW).

Your guide to booking Washington, D.C. to Seattle flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Wednesday departure and avoid flying on Sunday. On this route, Wednesday flights average $425, about $110 less than Sunday fares (21% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 12 weeks before you fly. On this route, that window historically saves about 50% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Washington, D.C. to Seattle trip for January. Fares historically average $270 round-trip in that month - typically $261 less than the most expensive month, which is July (based on the last 12 months).
  • If you have the time, taking a 1-stop flight through San Diego Airport (SAN) can be cheaper than flying direct. The cheapest layover option averages $354 round-trip on this route - about $106 less than direct flights (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Seattle/Tacoma Intl Airport.

    • Coast Gateway Hotel
    • Seattle Airport Marriott
    • Fairfield by Marriott Inn & Suites Seattle Sea-Tac Airport
  • All three major Washington DC airports fly into Seattle-Tacoma International Airport (SEA). Washington Dulles International Airport (IAD) serves as a hub for United Airlines. Ronald Reagan Washington National Airport (DCA) is a hub for American Airlines. Baltimore Washington Airport (BWI) is the primary hub of Southwest Airlines.
  • You can find helpful volunteers to answer any of your questions about travel at all three Washington airports. The Airport Ambassadors at DCA wear bright blue shirts. The Airport Pathfinders at BWI are recognizable in their navy blue shirts. The Airport Ambassadors at IAD stand out in their bright yellow shirts or hoodies. If you see any of these volunteers in the terminals or at the information desks, don't hesitate to ask them for assistance if you need it.
  • All three Washington airports provide animal relief stations for those traveling with a service animal or pet. DCA has four pet relief stations Landside and two Airside. BWI has two relief areas Landside and two Airside. IAD has three animal relief stations Landside, outside the terminal, and two stations Airside.
  • If you need to wait for a ride when you land at SEA and you are traveling with children, feel free to take advantage of the play area for kids that SEA has installed between Concourses A and B. Children can play with the oversized toys inspired by airplanes and airports as parents watch from the nearby seating.
  • At SEA, you can take advantage of the relaxation and massage services at Spa Terminal Getaway. This retail spa outlet is located at Gate A5 on Concourse A.

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

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

Direct departures

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 direct flights

Direct returns

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 direct flights

More options for your flight from Washington, D.C. to Seattle

Complete your trip to Seattle with a hotel stay or car rental