$109 Cheap Flights from Washington (DCA) to Seattle (SEA)

View $109 flight on Fri, Jan 9, 2026Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to Seattle-Tacoma International Airport (SEA)

Cheap Flights from Washington to Seattle (DCA-SEA)

Prices were available within the past 7 days and start at $109 for one-way flights and $158 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Jan 24 - Thu, Feb 5
DCA
Washington
SEA
Seattle
$158 Roundtrip, found 13 hours ago
$158
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Sat, Jan 24 from Washington to Seattle, returning Thu, Feb 5, priced at $158 found 13 hours ago
Delta
Sun, Jan 11 - Sat, Jan 17
DCA
Washington
SEA
Seattle
$159 Roundtrip, found 4 days ago
$159
Roundtrip
found 4 days ago
Select Delta flight, departing Sun, Jan 11 from Washington to Seattle, returning Sat, Jan 17, priced at $159 found 4 days ago
Southwest Airlines
Tue, Jan 20 - Thu, Jan 22
DCA
Washington
SEA
Seattle
$162 Roundtrip, found 5 days ago
$162
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Tue, Jan 20 from Washington to Seattle, returning Thu, Jan 22, priced at $162 found 5 days ago
Southwest Airlines
Wed, Feb 4 - Wed, Feb 11
DCA
Washington
SEA
Seattle
$166 Roundtrip, found 4 days ago
$166
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Wed, Feb 4 from Washington to Seattle, returning Wed, Feb 11, priced at $166 found 4 days ago
Frontier Airlines
Sat, Jan 24 - Mon, Feb 2
DCA
Washington
SEA
Seattle
$175 Roundtrip, found 13 hours ago
$175
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Sat, Jan 24 from Washington to Seattle, returning Mon, Feb 2, priced at $175 found 13 hours ago
Southwest Airlines
Wed, Jan 21 - Sat, Jan 24
DCA
Washington
SEA
Seattle
$176 Roundtrip, found 5 days ago
$176
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Jan 21 from Washington to Seattle, returning Sat, Jan 24, priced at $176 found 5 days ago
Southwest Airlines
Mon, Jan 26 - Wed, Jan 28
DCA
Washington
SEA
Seattle
$179 Roundtrip, found 5 days ago
$179
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Mon, Jan 26 from Washington to Seattle, returning Wed, Jan 28, priced at $179 found 5 days ago
Southwest Airlines
Sun, Jan 11 - Sat, Jan 17
DCA
Washington
SEA
Seattle
$184 Roundtrip, found 4 days ago
$184
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Sun, Jan 11 from Washington to Seattle, returning Sat, Jan 17, priced at $184 found 4 days ago
American Airlines
Thu, Feb 5 - Fri, Feb 6
DCA
Washington
SEA
Seattle
$193 Roundtrip, found 5 days ago
$193
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Feb 5 from Washington to Seattle, returning Fri, Feb 6, priced at $193 found 5 days ago
Alaska Airlines
Tue, Jan 20 - Sat, Jan 24
DCA
Washington
SEA
Seattle
$199 Roundtrip, found 1 hour ago
$199
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Jan 20 from Washington to Seattle, returning Sat, Jan 24, priced at $199 found 1 hour ago

Find the cheapest month to fly from Washington (DCA) to Seattle (SEA)

May is typically the cheapest month to fly

From $160 - $491 per traveler.

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $460
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $460
Flights from Washington (DCA) to Seattle (SEA)
Origin airport
Ronald Reagan Washington National
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, JetBlue Airways, Southwest Airlines, United
Roundtrip price
$158
Distance
2322 mi
Average flight time
3 hours 5 mins

Washington to Seattle Flights

The cheapest times to fly from Washington to Seattle

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 Washington to Seattle are during the month of January. You can find some of the cheapest flights from Washington to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Seattle

Sunday is one of the best days to book for cheap flights from Washington to Seattle: 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 Washington to Seattle

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 Washington to Seattle in 2026. You can also book with separate airlines for your outbound and return journeys, from $109 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 Washington to Seattle 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 Washington to Seattle 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 much does a flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) cost?
Secure a cheap one-way flight from $109 or cheap return flight from $158 from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from DCA to SEA is January, when there's less demand. Off-peak season is generally when airlines offer better prices between these airports.
Which airlines fly direct from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
When departing from Ronald Reagan Washington National Airport (DCA), you can hop on a nonstop flight to Seattle - Tacoma Intl. Airport (SEA) with Alaska Airlines.
What is the cheapest airline that flies from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll fly you from DCA to SEA. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
With an average of 2 nonstop flights departing from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) daily, you'll be up in the air in no time.
What are the most popular departure times for flights from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
The 8 AM departures from DCA to SEA are typically the busiest. Greater demand means you'll likely pay more for these departures. If you want to save on your trip, book during off-peak hours.
What day of the week has the most flights from DCA to SEA?
If you depart on a Friday, you'll get the biggest range of choices for flights from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Ronald Reagan Washington National Airport (DCA)'s first flight to Seattle - Tacoma Intl. Airport (SEA) departs at approximately 8:00AM UTC-5. With a flight time of 6h 4m, you'll arrive at around 11:04AM UTC-8.
How long does it take to fly from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Typically, it takes 6 hours and 4 minutes to cover the 2,300 mi from DCA to SEA.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Select a flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seattle from Ronald Reagan Washington National Airport (DCA)?
Seattle - Tacoma Intl. Airport (SEA) is the only airport in Seattle with direct flights from Ronald Reagan Washington National Airport (DCA). Check out the available options and find cheap fares on Expedia.
Is it cheaper to buy a plane ticket from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until right before your break to book your flight from DCA to SEA generally means paying more. While it's possible to find some last-minute discounts, they're not always guaranteed. Be flexible with your itinerary to maximize your chances of scoring a bargain.
Is it cheaper to book a DCA to SEA flight and hotel package?
You'll typically save money by securing a DCA to SEA flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. After choosing your ideal accommodations and flights, consider adding extras including tours, activities and car rentals.
Can I cancel or change the date of my flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Generally, it's possible to reschedule or cancel your DCA to SEA flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.