DCA to SEA Flights: Guide to Transcontinental Travel
Cheapest flight found
$140
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the May 7, 2026 departure — the cheapest date we found.
Price Behavior: DCA → SEA
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$140
Highest Fare
$279
Median Fare
$264
Price Spread
$139
Prices vary significantly — hourly tracking is especially valuable here.
Cheapest month to fly: May 2026 (from $140)
Most expensive month: August 2026 (from $279)
Biggest price drop caught: $54 between consecutive checks
Most frequent cheapest airline: Frontier
What This Means for You
Flights from Washington DC to Seattle range from $140 to $279, a $139 spread across the months we track. If your dates are flexible, May 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up hourly price alerts gives you the best chance of catching a short-lived drop before it corrects. We have caught drops as large as $54 between hourly checks on this route.
Track this route and save
Get email alerts when DCA to SEA prices drop. We check every hour.
Start Tracking This FlightSearch this route
From
Washington DC (DCA)
To
Seattle (SEA)
Airport Information
Washington DC (DCA)
Ronald Reagan Washington National Airport (DCA) is the most convenient gateway for those staying in the heart of Washington, D.C., located just across the Potomac River in Arlington, Virginia. It is famous for its 'River Visual' approach, offering stunning views of national monuments during takeoff and landing. The airport features a modern Terminal 2 and offers a wide array of high-end dining and shopping options for travelers before their long flight to the West Coast.
Seattle (SEA)
Seattle-Tacoma International Airport (SEA), commonly referred to as Sea-Tac, serves as the primary international gateway for the Pacific Northwest region. Located approximately 14 miles south of downtown Seattle, it serves as a major hub for both Alaska Airlines and Delta Air Lines. The airport has recently undergone significant renovations, including an expanded International Arrivals Facility and a diverse range of local food vendors that showcase the unique culinary spirit of the Puget Sound.
Frequently Asked Questions
How long is the flight from DCA to SEA?
A direct flight typically takes between 5 hours and 45 minutes to 6 hours, depending on the strength of the jet stream and wind speeds.
Which airlines offer direct flights from DCA to SEA?
Alaska Airlines is the primary carrier offering non-stop service on this specific route due to strict federal slot regulations at DCA, though other airlines offer one-stop connections.
Is there a time difference between Washington DC and Seattle?
Yes, Seattle is in the Pacific Time Zone, which is exactly three hours behind the Eastern Time Zone used in Washington, D.C.
What is the best way to get from SEA airport to downtown Seattle?
The Sound Transit Link Light Rail is an affordable and efficient option that runs directly from the airport station to various stops in the city center, taking about 40 minutes.
Learn More About Price Tracking
Flight Price Tracker
How Trip Manta monitors prices hourly vs Google Flights, Hopper, and Kayak.
Best Flight Price Trackers
Compare the top 7 trackers side by side — features, pricing, and check frequency.
Trip Manta vs Google Flights
How hourly tracking compares for catching short-lived price drops.
Our Methodology
How we track prices, trigger alerts, and what our data covers.
How Often Do Prices Drop?
Data study: drop frequency, average savings, and how long drops last.
Flight Price Alerts
Get email alerts when DCA to SEA prices drop — free.