SEA - WAS

$110 Find Cheap Flights from Seattle to Washington, D.C. - Compare and Save

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Everything you should know

Cheapest round-trip
$290
Typical prices: $323-$599
Frontier
Wed 9/19Sat 9/22
SEA - DCA • 2 stops
Cheapest non-stop
$345
Typical prices: $330-$608
Alaska Airlines
Mon 9/17Sun 9/23
SEA - IAD • Non-stop
Advice from real travelers
Delta Comfort Plus and United Economy Plus add extra legroom on this long flight.
Delta offers free Wi-Fi; Alaska Premium Class adds drinks and faster bag claim.
Expert advice
+1
Expert advice
+1
Nonstop flights
You can fly direct with Alaska Airlines, Delta and United Airlines. Average duration is 5h 08m
Direct flights
+1
Direct flights
+1
Top routes
Cheapest • 1% average savings
Most popular
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 7 weeks in advance save around 54% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 24% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg $334 (round-trip)
Shortest trip • 7h 33m (one-way)
Insights
Insights
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We hope you love your trip to Washington, D.C.!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

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

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

Sat, Sep 19 - Tue, Sep 22
Frontier Logo
8:15 pm - 12:11 pmSEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
36h 56m2 stops Los Angeles Denver Intl
Frontier Logo
7:00 am - 3:08 pmDCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
11h 08m1 stop Denver Intl
$290Frontier
Mon, Oct 5 - Mon, Oct 26
Frontier Logo
4:27 pm - 4:59 pmSEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
21h 32m1 stop Denver Intl
Frontier Logo
7:00 am - 6:26 pmDCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
38h 26m2 stops Denver Intl Los Angeles
$290Frontier
Tue, Sep 8 - Mon, Sep 14
Multiple Airlines Logo
8:48 pm - 6:20 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
30h 32m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
7:00 am - 9:37 amIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 37mnonstop
$321Multiple Airlines
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
9:45 pm - 6:20 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
29h 35m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
5:57 pm - 8:44 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 47mnonstop
$321Multiple Airlines
Thu, Sep 17 - Wed, Sep 23
Alaska Airlines Logo
9:35 pm - 5:40 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
5h 05mnonstop
Alaska Airlines Logo
5:57 pm - 8:44 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 47mnonstop
$345Alaska Airlines
Sat, Sep 19 - Fri, Sep 25
Alaska Airlines Logo
3:56 pm - 11:59 pmSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
5h 03mnonstop
Alaska Airlines Logo
7:00 am - 9:37 amIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 37mnonstop
$347Alaska Airlines
Fri, Oct 16 - Sun, Oct 18
Delta Logo
2:50 pm - 10:49 pmSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
4h 59mnonstop
Delta Logo
7:05 am - 9:56 amIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 51mnonstop
$377Delta
Thu, Oct 22 - Sun, Oct 25
Delta Logo
2:50 pm - 10:49 pmSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
4h 59mnonstop
Delta Logo
7:05 am - 9:56 amIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 51mnonstop
$377Delta
Thu, Sep 17 - Sun, Sep 20
United Airlines Logo
8:10 am - 4:16 pmSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
5h 06mnonstop
United Airlines Logo
5:33 pm - 8:18 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 45mnonstop
$377United Airlines
Fri, Sep 25 - Sat, Sep 26
United Airlines Logo
11:14 pm - 7:17 amSEA  Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl
5h 03mnonstop
United Airlines Logo
5:45 pm - 8:37 pmIAD  Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl
5h 52mnonstop
$377United Airlines
Booking Insights

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

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

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

Round-trip flights from Seattle to Washington, D.C. start at $290. Prices are below average for this route right now, with typical round-trip fares ranging from $323 to $599. The lowest price found in the past 5 days was $290 on Frontier.

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

There's little price difference between Seattle to Washington, D.C. routes. They average around $432 round-trip, based on KAYAK data over the past 12 months.

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

Thursday is the cheapest day of the week to fly from Seattle to Washington, D.C., it is 9% cheaper than the average day. Monday is the most expensive day with flight prices 24% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • January is the cheapest month to fly from Seattle to Washington, D.C. at $330 round-trip.
  • June ($553) and July ($483) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 67% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

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

Flights from Seattle to Washington, D.C. are cheapest 7 weeks before departure. Booking in this window typically costs about 54% 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 Seattle to Washington, D.C.

 
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 Delta, United Airlines, DCA 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.

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

Low season

February

Cheapest flight

$110
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 27% increase in price.
Flight from Seattle to Baltimore

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

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

Insights shared by verified travelers who flew the route from Seattle to Washington, D.C. 
Putri ArumFlew with Japan Airlines-Mar 2026
Bring your own foods. There should also be a disclaimer on the ticket that foods will not be provided although this is a relatively long flight.
SuzetteFlew with Alaska Airlines-May 2025
Take a shower before arriving at airport and don't wear perfume at all! Pack bags tight, so boarding is smooth and quick.
DanielFlew with Alaska Airlines-May 2025
Seatac has gnarly traffic right now, took 35min to get from highway exit to the terminal

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

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Does IAD have an on-site hotel?

    IAD has one on-site hotel. Referred to as Sleepbox Lounge, this hotel is between Gates A6 and A14, near the AeroTrain in Concourse A. You'll have a good rest at this hotel, as it features comfortable rooms.

  • Is there an on-site restaurant at DCA?

    If you're hungry, you can order food before exiting DCA, as this airport is full of restaurants. Some notable restaurants at this airport include Matsutake Sushi, American Tap Room, District Bar, Custom Burger, Cava Mezze Grill, and Grille District. If you just want snacks, you can visit the retail stores located throughout the airport.

  • Can I rent a car at BWI?

    If you want to rent a car once you disembark from your flight at BWI, you'll be able to do so. This is because BWI is connected to an off-site car rental facility that houses branches for reliable car rental agencies like Budget, Hertz, National, Alamo, Avis, Thrifty, and Enterprise. To board the shuttle, you'll use to travel to the airport's car rental facility, and head to the lower level of BWI's main terminal.

  • Does SEA have a children's play area?

    SEA has a children's play area. Located between the Central Terminal and Gates A, across from Seattle Taproom, this children's play area features several toys and soft playgrounds. Daily, it operates round-the-clock.

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

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

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

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

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

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

  • Which airlines include bags at no extra cost on Seattle to Washington, D.C. 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 travelers should check the fare details before booking.

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

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

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

    Prices vary by airline.

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

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $334 round-trip via Denver Intl (DEN), compared to $444 for nonstop.

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

    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.

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

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

    • Denver Intl (DEN) - 37% of one-stop connections
    • Chicago O'Hare Intl (ORD) - 23% of one-stop connections
    • Chicago Midway (MDW) - 14% of one-stop connections
    • Charlotte Douglas (CLT) - 7% of one-stop connections

    Denver Intl (DEN) handles the largest share of one-stop connections on this route.

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

    Yes. Being flexible with your travel dates can save you up to 27% on the Seattle to Washington, D.C. route. Thursday is the cheapest departure day at $399 round-trip on average, while Monday is the most expensive at $543, a difference of $144. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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

    Morning is the busiest departure period on Seattle to Washington, D.C. flights, with 45% of flights leaving in that window. Afternoon departures account for 22%, night flights for 22%, and evening flights for 11%.

  • What popular places can I visit in Washington, D.C.?

    Some of the most popular sights in Washington, D.C. are Walter E. Washington Convention Center, National Mall and Capital One Arena. These are among the most viewed places in Washington, D.C. on KAYAK.

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

    A nonstop flight from Seattle to Washington, D.C. takes 5h 08m, covering 2,319 miles.

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

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

    • Earliest: departs at 7:20 am and lands at 12:28 pm
    • Latest: departs at 11:14 pm and lands at 4:22 am.

    The flight takes about 5h 08m.

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

    Last-minute fares on this route - booked within 2 weeks of departure - run 81% above the route average of $435. Book 7 weeks before departure for the lowest fares.

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

    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.

  • Have flight prices from Seattle to Washington, D.C. 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 $290 to $2,249. That means the highest observed fare was about 8x higher than the lowest one.

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

    One-way fares from Seattle to Washington, D.C. are currently lower than usual. Average one-way flight prices are about $178, which is 40% below the typical average for this route.

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

    Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 7h 33m, compared with 7h 42m via Lambert-St Louis (STL) and 7h 50m via Chicago O'Hare Intl (ORD).

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

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

  • What car rental options are available in Washington, D.C.?

    Since Washington, D.C. is served by multiple airports, car rental options and rates can vary depending on which one you fly into.
    Near Washington, D.C. Reagan-National Airport (DCA) — daily rates from around $23:

    · Sixt
    · Dollar
    · Thrifty
    · Alamo
    · Budget

    Near Washington, D.C. Dulles Intl Airport (IAD) — daily rates from around $24:

    · Dollar
    · Budget
    · Hertz
    · Sixt
    · Thrifty

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

    Round-trip flights from Seattle to Washington, D.C. range from $323 to $599, with an average of $435 over the past 12 months. Anything below $323 counts as a good deal.

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

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

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

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Thursday departure instead of Monday. On this route, Thursday flights average $399 - about $144 less than Monday (27% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 7 weeks before you fly. On this route, that window historically saves about 54% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Seattle to Washington, D.C. trip for January. Fares historically average $330 round-trip in that month - typically $223 less than the most expensive month, which is June (based on the last 12 months).
  • If you have the time, taking a 1-stop flight through Denver Intl Airport (DEN) can be cheaper than flying direct. The cheapest layover option averages $334 round-trip on this route - about $110 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 Washington, D.C. Reagan-National Airport.
    - Hyatt House Washington DC The Wharf
    - Canopy by Hilton Washington D.C - The Wharf
    - Intercontinental Hotels Washington D.C. - The Wharf By IHG
  • To travel from Seattle's city center to Seattle-Tacoma International Airport (SEA), you can board a King County Metro bus, a private taxi, or a LINK Light Rail train. You should board a taxi if you're in a rush, a metro bus if you'd like to travel cheaply, and a train if you want to balance speed and cost.
  • In case you need help at SEA, you'll be able to easily get it, as this airport features several staff members mandated with the responsibility of assisting passengers at the airport. Given that they all wear distinct blue vests, you'll be able to spot one without hassle.
  • If you've got time to spare, while waiting for your flight to Washington at SEA, you can enjoy relaxing spa services at the outstanding Terminal Gateway Spa. This spa, situated a short distance from gate A5, is normally open from 7 am to 10 pm. It features adequately experienced professionals, state-of-the-art spa equipment, and high-quality spa oils.
  • In Washington, you can land at Baltimore/Washington International Thurgood Marshall Airport (BWI), Dulles International Airport (IAD), or Ronald Reagan Washington National Airport (DCA). When booking your flight to Washington, you should book one that lands at DCA. This is because, among the three Washington airports, it is the closest to Washington's city center. Given that it also has the least passenger traffic, you won't encounter massive queues at DCA.
  • If you've traveled to Washington with your pet, you can let it relieve itself in one of DCA's designated pet relief areas once you land at the airport. These pet relief areas are opposite Doors 1 and 5 in Terminal A, opposite the South Metrorail station entrance in Terminal B, and across from the North Metrorail Station Entrance in Terminal C.

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 direct 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 direct flights

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

Information on your arrival and departure airports