DCA - SEA

C$ 297 Find Cheap Flights from Washington, D.C. to Seattle – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 535
Typical prices: C$ 476-C$ 870
Delta
Sun 21/1Wed 24/1
DCA - SEA • Direct
Cheapest one-way flights
C$ 297
Typical prices: C$ 272-C$ 646
Delta
Sat 17/11
DCA - SEA • Direct
Advice from real travellers
DCA is easier than IAD and worth the higher fare for central Washington, D.C. trips.
On Alaska, pack light: overhead bin space fills fast on DCA-Seattle flights.
Expert advice
+1
Expert advice
+1
Direct flights
You can fly direct with Alaska Airlines and Delta. Average duration is 6h 06m
Direct flights
+1
Direct flights
+1
When to book
in advance
Our data shows that travellers who book at least 9 weeks in advance save around 56% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 43% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg C$ 516 (round-trip)
Shortest trip • 7h 32m (one-way)
Insights
Insights
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We hope you enjoy your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Washington, D.C. to Seattle (DCA-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

Thu, 21 Jan - Sun, 24 Jan
Delta Logo
4:40 p.m. - 7:45 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
6h 05mdirect
Delta Logo
7:23 a.m. - 3:34 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
5h 11mdirect
C$ 535Delta
2 days ago
Thu, 21 Jan - Wed, 27 Jan
Alaska Airlines Logo
8:00 a.m. - 11:03 a.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
6h 03mdirect
Alaska Airlines Logo
8:15 a.m. - 8:00 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
8h 45m1 stop Los Angeles
C$ 550Alaska Airlines
3+ days ago
Fri, 22 Jan - Wed, 27 Jan
Delta Logo
4:40 p.m. - 7:45 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
6h 05mdirect
Delta Logo
7:23 a.m. - 3:34 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
5h 11mdirect
C$ 564Delta
2 days ago
Fri, 13 Nov - Tue, 17 Nov
Southwest Logo
6:30 p.m. - 12:45 a.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
9h 15m1 stop Chicago Midway
Southwest Logo
11:20 a.m. - 11:20 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
9h 00m1 stop Chicago Midway
C$ 571Southwest
2 days ago
Fri, 8 Jan - Tue, 12 Jan
Southwest Logo
3:55 p.m. - 10:35 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
9h 40m1 stop Las Vegas Harry Reid Intl
Southwest Logo
6:35 a.m. - 6:30 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
8h 55m2 stops Chicago Midway Lambert-St Louis
C$ 578Southwest
1 day ago
Thu, 12 Nov - Wed, 18 Nov
Southwest Logo
2:40 p.m. - 12:45 a.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
13h 05m1 stop Chicago Midway
Southwest Logo
9:10 a.m. - 11:50 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
11h 40m2 stops Austin Bergstrom Dallas Love Field
C$ 579Southwest
3+ days ago
Fri, 13 Nov - Thu, 19 Nov
Southwest Logo
2:40 p.m. - 11:05 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
11h 25m2 stops Lambert-St Louis Denver Intl
Southwest Logo
6:30 a.m. - 4:15 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
6h 45m1 stop Chicago Midway
C$ 585Southwest
2 days ago
Thu, 12 Nov - Tue, 17 Nov
Southwest Logo
2:40 p.m. - 12:45 a.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
13h 05m1 stop Chicago Midway
Southwest Logo
9:10 a.m. - 9:55 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
9h 45m2 stops Austin Bergstrom Atlanta Hartsfield-Jackson
C$ 586Southwest
1 day ago
Thu, 21 Jan - Mon, 25 Jan
Delta Logo
4:40 p.m. - 7:45 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
6h 05mdirect
Delta Logo
7:23 a.m. - 3:34 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
5h 11mdirect
C$ 592Delta
2 days ago
Wed, 11 Nov - Thu, 12 Nov
Southwest Logo
6:50 p.m. - 11:35 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
7h 45m1 stop Chicago Midway
Southwest Logo
5:30 a.m. - 10:55 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
14h 25m2 stops Chicago Midway Kansas City
C$ 594Southwest
2 days ago
Booking Insights

Price, demand, and travel trends for Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to Seattle?

Round-trip flights from Washington, D.C. Reagan-National Airport to Seattle typically range from C$ 476 to C$ 870. The lowest price found in the past 5 days was C$ 535, on Delta.

What's the cheapest day of the week to fly from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to Seattle. It’s 8% cheaper than the average day, while Sunday is the most expensive, with prices 23% higher.

What is the cheapest month to fly from Washington, D.C. Reagan-National Airport to Seattle?

•January is the cheapest month to fly from Washington, D.C. Reagan-National Airport to Seattle at C$ 375 round-trip.
•July (C$ 798) and June (C$ 768) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 112% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from Washington, D.C. Reagan-National Airport to Seattle the cheapest?

Flights from Washington, D.C. Reagan-National Airport to Seattle are cheapest 9 weeks before departure. Booking in this window typically costs about 56% 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
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.

Harriet Baskas

Harriet Baskas

Expert on 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.

Key details for Washington, D.C. Reagan-National Airport to Seattle flights

Low season

February

Cheapest flight

C$ 297
Beat the crowds with an average 27% drop in traveller numbers.
The most popular month to fly with an average 65% increase in traveller numbers.
One-way flight from Washington, D.C. Reagan-National Airport 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 travellers 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
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.
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 .

Your Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to Seattle?

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

    • Earliest: departs at 8:00 am and lands at 2:06 pm
    • Latest: departs at 5:11 pm and lands at 11:17 pm.

    The flight takes about 6h 06m.

  • Which cabin classes can I book on flights from Washington, D.C. Reagan-National Airport to Seattle?

    Two cabin classes are available on flights from Washington, D.C. Reagan-National Airport to Seattle:

    • Economy Class
    • First Class

  • How long does a flight from Washington, D.C. Reagan-National Airport to Seattle take?

    A direct flight from Washington, D.C. Reagan-National Airport to Seattle takes 6h 06m, covering 6,012 km.

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

    No, a passport is not required for this domestic route, but you will need another form of identification, such as a driver's licence.

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

    Round-trip flights from Washington, D.C. Reagan-National Airport to Seattle range from C$ 476 to C$ 870, with an average of C$ 660 over the past 12 months. Anything below C$ 476 counts as a good deal.

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

    Last-minute fares on this route (booked within two weeks of departure) run 66% above the C$ 660 route average. Book 9 weeks before departure for the lowest fares.

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

    On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 516 round-trip via Denver Intl (DEN), compared to C$ 704 for direct.

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

    There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 50–C$ 128 for the first checked bag in economy. Premium fares and elite status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from Washington, D.C. Reagan-National Airport to Seattle?

    The Boeing 737-800 Passenger/BBJ2 (winglets) family is used most often on this route, operated mainly by Alaska Airlines. Other aircraft seen on the route include Airbus A321neo variants.

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

    Morning is the busiest departure period on Washington, D.C. Reagan-National Airport to Seattle flights, with 34% leaving in that window. Afternoon departures account for 33%, Evening flights for 33%, and Night flights for 0%.

  • Have flight prices from Washington, D.C. Reagan-National Airport 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 C$ 535 to C$ 2,476. That means the highest observed fare was about 5x higher than the lowest one.

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

    Two airlines offer in-flight Wi-Fi on Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to Seattle looking right now?

    One-way fares from Washington, D.C. Reagan-National Airport to Seattle are currently lower than usual. Average one-way flight prices are about C$ 328, which is 17% 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 C$ 5 for economy cars. Top options include:

    • Fox
    • Europcar
    • Thrifty
    • Budget
    • Hertz

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

    Flights from Washington, D.C. Reagan-National Airport to Seattle usually depart from Washington, D.C. Reagan-National (DCA) and arrive at Seattle/Tacoma Intl (SEA).

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

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

    • Chicago O'Hare Intl (ORD) – 40% of one-stop connections
    • Denver Intl (DEN) – 36% of one-stop connections
    • Chicago Midway (MDW) – 16% of one-stop connections
    • Charlotte Douglas (CLT) – 3% of one-stop connections

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

    Yes. Flexible dates can save you up to 25% on flights from Washington, D.C. Reagan-National Airport to Seattle. Wednesday is the cheapest departure day at C$ 611 round-trip on average, while Sunday is the most expensive at C$ 814, a difference of C$ 203.

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

  • Which airlines fly from Washington, D.C. Reagan-National Airport to Seattle?

    2 airlines operate flights between Washington, D.C. Reagan-National Airport and Seattle. The airlines offering direct flights on this route include:

    • Alaska Airlines
    • Delta

  • How much time can I save by choosing a different layover airport when travelling from Washington, D.C. Reagan-National Airport 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 8h 18m via Charlotte Douglas (CLT).

  • What is the time difference between Washington, D.C. Reagan-National Airport and Seattle?

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

  • Which popular places can I visit in Seattle?

    Some of the most popular sights in Seattle are Lumen Field, T-Mobile Park, and Seattle Waterfront. These are among the most viewed places in Seattle on KAYAK.

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

    Among airlines operating Washington, D.C. Reagan-National Airport to Seattle flights:

    • Alaska Airlines: offers extra legroom; offers free seat selection
    • Delta: offers extra legroom; 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. Reagan-National Airport to Seattle flights?

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

    • Alaska Airlines: a carry-on bag and a checked bag in Economy Class
    • Delta: a carry-on bag and a checked bag in First Class

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

Your guide to booking Washington, D.C. Reagan-National Airport 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 C$ 611, about C$ 203 less than Sunday fares (25% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 9 weeks before you fly. On this route, that window historically saves about 56% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Washington, D.C. Reagan-National Airport to Seattle trip for January. Fares historically average C$ 375 round-trip in that month – typically C$ 423 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 Denver Intl Airport (DEN) can be cheaper than flying direct. The cheapest layover option averages C$ 516 round-trip on this route – about C$ 188 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

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

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

Direct departures

Washington, D.C. Reagan-National to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta

Alaska Airlines,Delta

Tuesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Wednesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Thursday

Alaska Airlines,Delta

Alaska Airlines,Delta

Friday

Alaska Airlines,Delta

Alaska Airlines,Delta

Saturday

Alaska Airlines,Delta

Alaska Airlines,Delta

Sunday

Alaska Airlines,Delta

Alaska Airlines,Delta

See more nonstop flights

Direct returns

Seattle/Tacoma Intl to Washington, D.C. Reagan-National

Monday

Alaska Airlines,Delta

Alaska Airlines,Delta

Tuesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Wednesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Thursday

Alaska Airlines,Delta

Alaska Airlines,Delta

Friday

Alaska Airlines,Delta

Alaska Airlines,Delta

Saturday

Alaska Airlines,Delta

Alaska Airlines,Delta

Sunday

Alaska Airlines,Delta

Alaska Airlines,Delta

See more nonstop flights

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

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