$159 Cheap Delta flights Washington (DCA) to Seattle (SEA)

View $159 flight on Wed, Sep 17, 2025Opens in a new window

$159 Cheap Delta flights Washington (DCA) to Seattle (SEA)

Prices were available within the past 7 days and start at $159 for one-way flights and $277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Dec 3 - Sat, Dec 6
DCA
Washington
SEA
Seattle
$277 Roundtrip, just found
$277
Roundtrip
just found
Select Delta flight, departing Wed, Dec 3 from Washington to Seattle, returning Sat, Dec 6, priced at $277 just found
Delta
Sat, Aug 30 - Wed, Sep 3
DCA
Washington
SEA
Seattle
$307 Roundtrip, found 2 hours ago
$307
Roundtrip
found 2 hours ago
Select Delta flight, departing Sat, Aug 30 from Washington to Seattle, returning Wed, Sep 3, priced at $307 found 2 hours ago
Delta
Thu, Oct 2 - Sat, Oct 4
DCA
Washington
SEA
Seattle
$308 Roundtrip, found 3 hours ago
$308
Roundtrip
found 3 hours ago
Select Delta flight, departing Thu, Oct 2 from Washington to Seattle, returning Sat, Oct 4, priced at $308 found 3 hours ago
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, JetBlue Airways, Southwest Airlines, United
Popular airline
Alaska Airlines
Distance
2322 mi
Average flight time
2 hours 56 mins

Frequently asked questions

How much is a Delta Air Lines flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
You can find cheap return Delta Air Lines flights from $277 from DCA to SEA by sorting your results from "Price (lowest to highest)" on Expedia. Or search for options from $159 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from DCA to SEA with Delta Air Lines?
Look for one-way or return flights to Seattle in January or February. You could find a cheap fare with Delta Air Lines during these quieter months.
What is the cheapest time to book flights from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) with Delta Air Lines?
Search for cheap Delta Air Lines flights from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) one to three months before your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the best day to book a domestic flight is generally Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
To find out if there's a direct trip from DCA to SEA with Delta Air Lines or other carriers, use our "Nonstop" filter when looking for tickets.
What is the earliest Delta Air Lines flight from DCA to SEA?
To find the earliest departures from DCA to SEA with Delta Air Lines, filter your results by "Early Morning" and "Morning." Choosing an early flight generally means you're less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Seattle?
Delta Air Lines flights from Ronald Reagan Washington National Airport (DCA) to Seattle touch down at Seattle - Tacoma Intl. Airport (SEA). This is the main entry point here.
Why fly with Delta Air Lines from DCA to SEA?
Heading from DCA to SEA with Delta Air Lines means enjoying a variety of perks, such as a rewarding loyalty program and an excellent in-flight experience. Plus, when booking through Expedia, One Key™ members can earn OneKeyCash™* to use on select future travel purchases. That's on top of the Delta SkyMiles points you can earn with Delta Air Lines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Depending on the type of fare you purchased, a fee will generally apply if you change or cancel your booking more than 24 hours after it's been confirmed. To secure flexible plane tickets, select our "Changes included" and "No cancel fee" boxes when you look for flights. For more information on modifying or canceling your reservation, head to "Trips," select your flight and tick "Manage Booking."

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*Available to One Key members.