$104 Cheap Flights from Seattle (SEA) to Washington (DCA)

View $104 flight on Tue, May 20, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Seattle to Washington (SEA-DCA)

Prices were available within the past 7 days and start at $104 for one-way flights and $188 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, May 13 - Tue, May 20
SEA
Seattle
DCA
Washington
$188 Roundtrip, found 7 hours ago
$188
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Tue, May 13 from Seattle to Washington, returning Tue, May 20, priced at $188 found 7 hours ago
Frontier Airlines
Fri, May 30 - Sat, Jun 7
SEA
Seattle
DCA
Washington
$198 Roundtrip, found 8 hours ago
$198
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Fri, May 30 from Seattle to Washington, returning Sat, Jun 7, priced at $198 found 8 hours ago
Frontier Airlines
Wed, May 28 - Sat, May 31
SEA
Seattle
DCA
Washington
$208 Roundtrip, just found
$208
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, May 28 from Seattle to Washington, returning Sat, May 31, priced at $208 just found
Frontier Airlines
Fri, Jun 6 - Sat, Jun 7
SEA
Seattle
DCA
Washington
$218 Roundtrip, just found
$218
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Jun 6 from Seattle to Washington, returning Sat, Jun 7, priced at $218 just found
Frontier Airlines
Tue, May 6 - Wed, May 21
SEA
Seattle
DCA
Washington
$228 Roundtrip, just found
$228
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, May 6 from Seattle to Washington, returning Wed, May 21, priced at $228 just found
Frontier Airlines
Sat, May 24 - Wed, May 28
SEA
Seattle
DCA
Washington
$233 Roundtrip, found 1 hour ago
$233
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, May 24 from Seattle to Washington, returning Wed, May 28, priced at $233 found 1 hour ago
Alaska Airlines
Sat, May 17 - Sat, May 31
SEA
Seattle
DCA
Washington
$247 Roundtrip, found 2 days ago
$247
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, May 17 from Seattle to Washington, returning Sat, May 31, priced at $247 found 2 days ago
American Airlines
Fri, May 16 - Tue, May 20
SEA
Seattle
DCA
Washington
$253 Roundtrip, found 9 hours ago
$253
Roundtrip
found 9 hours ago
Select American Airlines flight, departing Fri, May 16 from Seattle to Washington, returning Tue, May 20, priced at $253 found 9 hours ago
Delta
Tue, May 27 - Wed, May 28
SEA
Seattle
DCA
Washington
$257 Roundtrip, just found
$257
Roundtrip
just found
Select Delta flight, departing Tue, May 27 from Seattle to Washington, returning Wed, May 28, priced at $257 just found
United
Wed, May 21 - Sat, May 31
SEA
Seattle
DCA
Washington
$261 Roundtrip, found 4 hours ago
$261
Roundtrip
found 4 hours ago
Select United flight, departing Wed, May 21 from Seattle to Washington, returning Sat, May 31, priced at $261 found 4 hours ago
Flights from Seattle (SEA) to Washington (DCA)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Ronald Reagan Washington National
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, JetBlue Airways, Southwest Airlines, United
Roundtrip price
$182
Distance
2322 mi

Seattle to Washington Flights

The cheapest times to fly from Seattle to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Washington are during the month of May. You can find some of the cheapest flights from Seattle to Washington with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Seattle to Washington

Sunday is one of the best days to book for cheap flights from Seattle to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Seattle to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $104 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How long does it take to fly from Seattle - Tacoma Intl. Airport (SEA) to National Airport?
Alaska Airlines has a direct flight leaving from Sea-Tac Airport at 8:43AM and landing at Ronald Reagan Washington National Airport (DCA) at 4:50PM — a total flight time of 5 hours and 7 minutes. Pick the best available seat, bring your headphones to keep you amused and the time will pass by quickly.
Is it cheaper to buy a plane ticket from Sea-Tac Airport to National Airport last minute?
Being a spontaneous soul is a fantastic way to discover the world, but it isn’t always the smartest method to land a bargain plane ticket. Think about booking your Sea-Tac Airport to Ronald Reagan Washington National Airport (DCA) trip well in advance rather than leaving it to the last minute. Based on flight pricing and demand studies in 2022, we have found that the best time to book domestic flights is between 28 – 35 days ahead of the departure date, and international flights three to four months in advance. Leave your spontaneity for when you’re discovering Ronald Reagan Washington National Airport (DCA)!
What airline has the least delays from Sea-Tac Airport to Ronald Reagan Washington National Airport (DCA)?
With an on-time performance score of 83%, Alaska Airlines is the carrier that’s likelier to fly you from Sea-Tac Airport to National Airport without any hiccups. Flight delays can be a nice excuse to relax in the airport lounge. However, they can also lead to a missed connection that ruins your entire vacation. You can keep updated by checking your flight status through the Expedia App before you even reach the airport. If you’re already at your gate and you’re worried about how the disruption will affect your trip, head to the customer service desk to find out your next steps.
What airports do you fly into for Washington from Seattle?
With Ronald Reagan Washington National Airport (DCA), Washington Dulles Intl. Airport (IAD) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to select from, making your way from Seattle to Washington is a breeze. The city’s main terminal, Ronald Reagan Washington National Airport (DCA), is approximately 4 mi south of the downtown area. As well as the price of fares, consider factors like public transportation options from the airport and the distance to your hotel when deciding where to touch down. Get your Washington trip off to a flying start by checking out White House and United States Capitol.
What are the most popular departure times for flights from Sea-Tac Airport to National Airport?
Between 8:00 AM - 9:00 AM is when you’ll find many Alaska Airlines flights jetting off from Seattle - Tacoma Intl. Airport (SEA) to Ronald Reagan Washington National Airport (DCA). Our advice? Get up and away in the morning. With air traffic yet to build up, your chances of traveling on a delay-free flight are higher.
Can I change the date of my flight from SEA to National Airport?
Plans can change, so Expedia is here to help make amending your flight as easy as possible. To start, access your SEA to National Airport itinerary through the Expedia Trips portal and look up the fare conditions and rules about what changes can be made. If you booked your ticket in the last 24 hours, some carriers will let you cancel for free and organize new flights. If you bought your ticket more than 24 hours ago, get in touch with us via our Customer Service portal so we can help you further.

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*Available to One Key members.