$104 Cheap Frontier Airlines flights Seattle (SEA) to Washington (DCA)

Finding cheap one-way Frontier Airlines flights from SEA to DCA from $104 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $183 for your next getaway.**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.

Search for return or one-way flights to Washington in January or February. You could find cheaper fares with Frontier Airlines during these off-season months.

To find cheap Frontier Airlines fares from Seattle - Tacoma Intl. Airport (SEA) to Ronald Reagan Washington National Airport (DCA), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence what you pay. Sunday tends to be the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking on a Sunday.**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.

To find out if there’s a direct journey from SEA to DCA with Frontier Airlines or another airline, select the “Nonstop” filter when searching for flights.

Find Frontier Airlines’s earliest flights from SEA to DCA by selecting our “Early Morning” and “Morning” filters. Not only will you get to your destination sooner, early departures also experience 20% fewer 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.

Ronald Reagan Washington National Airport (DCA) is the main Washington hub for Frontier Airlines flights from Seattle - Tacoma Intl. Airport (SEA).

Travel from SEA to DCA with Frontier Airlines and enjoy a range of benefits including a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you can also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are usually free within 24 hours of booking, but your airline may charge a fee after that time. For more information about modifying your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to adjust your plans without additional costs, apply the “No cancel fee” or “Changes included” filter when organizing your next getaway.