SEA - DCA

C$ 237 Find Cheap Flights from Seattle to Reagan Washington National Airport – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 402
Typical prices: C$ 442-C$ 847
Delta
Sat 17/11Thu 22/11
SEA - DCA • 1 stop
Cheapest direct flights
C$ 460
Typical prices: C$ 455-C$ 864
Delta
Tue 30/10Thu 1/11
SEA - DCA • Direct
Direct flights
Every day
You can fly direct with Alaska Airlines and Delta. Average duration is 5h 07m
Direct flights
+1
Direct flights
+1
When to book
21 weeks
in advance
Our data shows that travellers who book at least 21 weeks in advance save around 56% compared to booking last minute.
Insights
Insights
When to travel
February
Cheapest • 31% price drop
November
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Denver Intl (DEN)
Cheapest • Avg C$ 451 (round-trip)
Minneapolis St Paul (MSP)
Shortest trip • 7h 26m (one-way)
Insights
Insights
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We hope you enjoy your trip to Washington, D.C. Reagan-National Airport!
Flight Deals
Booking Insights
Flight Deals

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

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

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

Tue, 17 Nov - Fri, 4 Dec
Delta Logo
1:35 p.m. - 11:26 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
6h 51m1 stop Detroit Metropolitan Wayne County
Delta Logo
4:25 p.m. - 7:46 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
6h 21mdirect
C$ 402Delta
Fri, 23 Oct - Sat, 24 Oct
Delta Logo
11:50 p.m. - 11:00 a.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
8h 10m1 stop Minneapolis St Paul
Delta Logo
3:00 p.m. - 8:50 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
8h 50m1 stop Minneapolis St Paul
C$ 408Delta
Wed, 11 Nov - Sun, 15 Nov
Delta Logo
11:15 p.m. - 8:40 a.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
6h 25m1 stop Detroit Metropolitan Wayne County
Delta Logo
6:05 a.m. - 12:29 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
9h 24m1 stop Minneapolis St Paul
C$ 416Delta
Wed, 18 Nov - Sat, 5 Dec
Southwest Logo
6:10 a.m. - 6:55 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
9h 45m2 stops Denver Intl Lambert-St Louis
Southwest Logo
9:25 a.m. - 4:45 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
10h 20m1 stop Chicago Midway
C$ 423Southwest
Mon, 16 Nov - Wed, 18 Nov
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
Southwest Logo
2:40 p.m. - 10:50 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
11h 10m2 stops Lambert-St Louis Denver Intl
C$ 430Southwest
Mon, 19 Oct - Wed, 28 Oct
Southwest Logo
12:10 a.m. - 2:20 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
11h 10m1 stop Chicago Midway
Southwest Logo
11:40 a.m. - 7:05 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
10h 25m2 stops Columbus Denver Intl
C$ 432Southwest
Tue, 27 Oct - Wed, 28 Oct
Southwest Logo
12:10 a.m. - 12:50 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
9h 40m2 stops Chicago Midway Nashville Intl
Southwest Logo
6:35 p.m. - 7:25 a.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
15h 50m2 stops Chicago Midway Oakland
C$ 439Southwest
Fri, 11 Dec - Mon, 14 Dec
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
Southwest Logo
6:50 p.m. - 8:35 a.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
16h 45m2 stops Chicago Midway Oakland
C$ 447Southwest
Mon, 19 Oct - Wed, 21 Oct
Southwest Logo
6:50 p.m. - 8:30 a.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
10h 40m2 stops Phoenix Sky Harbor Intl Nashville Intl
Southwest Logo
4:00 p.m. - 11:55 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
10h 55m2 stops Nashville Intl Phoenix Sky Harbor Intl
C$ 454Southwest
Fri, 30 Oct - Sun, 1 Nov
Delta Logo
7:20 a.m. - 3:23 p.m.SEA  Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National
5h 03mdirect
Delta Logo
4:45 p.m. - 7:35 p.m.DCA  Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl
5h 50mdirect
C$ 460Delta
Booking Insights

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

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

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

Round-trip flights from Seattle to Washington, D.C. Reagan-National Airport start at C$ 402. Prices are below average for this route right now, with typical round-trip fares ranging from C$ 442 to C$ 847. The lowest price found in the past 5 days was C$ 402 on Delta.

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

Thursday is the cheapest day of the week to fly from Seattle to Washington, D.C. Reagan-National Airport and is 11% cheaper than the average day. Monday is the most expensive day with flight prices 31% 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. Reagan-National Airport?

•February is the cheapest month to fly from Seattle to Washington, D.C. Reagan-National Airport at C$ 412 round-trip.
•June (C$ 861) and November (C$ 705) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 108% 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. Reagan-National Airport the cheapest?

Flights from Seattle to Washington, D.C. Reagan-National Airport are cheapest 21 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.

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

Low season

September

Cheapest flight

C$ 237
Best time to beat the crowds (2% less expensive on average)
Most popular time to fly (18% more expensive on average)
Flights from Seattle to Washington, D.C. Reagan-National Airport

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

Your Seattle to Washington, D.C. Reagan-National Airport flight questions, answered

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

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

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

    • Earliest: departs at 7:20 am and lands at 12:27 pm
    • Latest: departs at 2:02 pm and lands at 7:09 pm.

    The flight takes about 5h 07m.

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

    Only Economy Class is available on flights from Seattle to Washington, D.C. Reagan-National Airport.

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

    A direct flight from Seattle to Washington, D.C. Reagan-National Airport takes 5h 07m, covering 6,012 km.

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

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

    Round-trip flights from Seattle to Washington, D.C. Reagan-National Airport range from C$ 442 to C$ 847, with an average of C$ 598 over the past 12 months. Anything below C$ 442 counts as a good deal.

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

    Last-minute fares on this route – booked within 2 weeks of departure – run 76% above the route average of C$ 598. Book 21 weeks before departure for the lowest fares.

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

    On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 451 round-trip via Denver Intl (DEN), compared to C$ 621 for direct.

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

    There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 49–C$ 140 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 Seattle to Washington, D.C. Reagan-National Airport?

    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 Seattle to Washington, D.C. Reagan-National Airport spread across the day?

    Morning is the busiest departure period on Seattle to Washington, D.C. Reagan-National Airport flights, with 67% leaving in that window. Afternoon departures account for 33%, Evening flights for 0%, and Night flights for 0%.

  • Have flight prices from Seattle to Washington, D.C. Reagan-National Airport 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$ 402 to C$ 2,744. That means the highest observed fare was about 7x higher than the lowest one.

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

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

    One-way fares from Seattle to Washington, D.C. Reagan-National Airport are currently lower than usual. Average one-way flight prices are about C$ 275, which is 35% below the typical average for this route.

  • What car rental options are available at Washington, D.C. Reagan-National Airport (DCA)?

    Washington, D.C. Reagan-National Airport (DCA) hosts 5 major car rental companies, with daily rates starting from around C$ 32 for economy cars. Top options include:
    • Sixt
    • Dollar
    • Thrifty
    • Alamo
    • Budget

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

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

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

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

    • Denver Intl (DEN) – 43% of one-stop connections
    • Chicago O'Hare Intl (ORD) – 26% of one-stop connections
    • Chicago Midway (MDW) – 17% of one-stop connections
    • Boston Logan Intl (BOS) – 5% 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. Reagan-National Airport?

    Yes. Being flexible with your travel dates can save you up to 33% on the Seattle to Washington, D.C. Reagan-National Airport route. Thursday is the cheapest departure day at C$ 534 round-trip on average, while Monday is the most expensive at C$ 789, a difference of C$ 255. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • Which airlines are available on the route from Seattle to Washington, D.C. Reagan-National Airport?

    2 airlines operate flights between Seattle and Washington, D.C. Reagan-National Airport. 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 Seattle to Washington, D.C. Reagan-National Airport?

    Flying via Minneapolis St Paul (MSP) gives the shortest average 1-stop total travel time at 7h 26m, compared with 7h 31m via Detroit Metropolitan Wayne County (DTW) and 7h 42m via Lambert-St Louis (STL).

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

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

  • Which popular places can I visit in Washington, D.C. Reagan-National Airport?

    Some of the most popular sights in Washington, D.C. Reagan-National Airport are National Mall, Capital One Arena, and Kennedy Center. These are among the most viewed places in Washington, D.C. Reagan-National Airport on KAYAK.

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

    Among airlines operating Seattle to Washington, D.C. Reagan-National Airport 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 Seattle to Washington, D.C. Reagan-National Airport 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 Economy Class

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

Your guide to booking Seattle to Washington, D.C. Reagan-National Airport 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 Thursday departure instead of Monday. On this route, Thursday flights average C$ 534 – about C$ 255 less than Monday (32% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 21 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 Seattle to Washington, D.C. Reagan-National Airport trip for February. Fares historically average C$ 412 round-trip in that month – typically C$ 448 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 C$ 451 round-trip on this route – about C$ 171 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
    - Intercontinental Hotels Washington D.C. - The Wharf By IHG
    - Canopy by Hilton Washington D.C - The Wharf

Prefer to fly direct from Seattle to Reagan Washington National Airport?

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

Direct departures

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

Direct returns

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

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

Complete your trip to Washington, D.C. with a hotel stay or car rental

Car rentals in Washington, D.C.
Hotels in Washington, D.C.
Vacations in Washington, D.C.