DCA to SEA Flights: Guide to Transcontinental Travel
Cheapest flight found
$144.58
Last updated Feb 16, 2026
Prices by Month
Price History
Tracking the May 7, 2026 departure — the cheapest date we found.
Search this route
From
Washington DC (DCA)
To
Seattle (SEA)
Track this route and save
Get email alerts when DCA to SEA prices drop. We check every hour.
Search FlightsTraveling from the nation’s capital to the Emerald City represents a massive cross-country leap from the Atlantic coast to the Pacific Northwest, covering roughly 2,300 miles of diverse American landscape. This route connects the political heart of the United States at Ronald Reagan Washington National Airport (DCA) with the booming tech and coffee hub of Seattle-Tacoma International Airport (SEA). Whether you are flying for a high-stakes government meeting or to explore the lush greenery and iconic Space Needle, the journey offers a fascinating transition from the neoclassical architecture of the East Coast to the rugged, evergreen landscapes of Washington State. This flight is a staple for business travelers and tourists alike, bridging two of the most influential metropolitan areas in the country with daily service.
Travel Tips
Book a window seat on the right side of the aircraft when flying westbound to potentially catch stunning views of the Cascade Mountains and Mount Rainier as you descend into the Seattle area.DCA is known for its incredible proximity to downtown DC, so utilize the Metro's Blue or Yellow lines to arrive at the terminal quickly and avoid expensive rideshare surges during the notorious DC rush hour.Because this is a long-haul domestic flight lasting nearly six hours, ensure you pack a portable power bank and download offline entertainment, as Wi-Fi availability and power outlets can vary depending on the specific aircraft equipment used by the carrier.Prepare for the 'Seattle Mist' by keeping a lightweight, waterproof shell in your carry-on, as the weather in the Pacific Northwest can shift rapidly from sunshine to drizzle regardless of the season you arrive.
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.
Seasonal Pricing Patterns
Airfare between DCA and SEA tends to fluctuate significantly based on the season and local events. The most expensive time to fly is typically during the summer months of July and August when the weather in Seattle is most reliable and tourism peaks. Conversely, you can often find the lowest fares during the rainy late autumn or mid-winter months, specifically January and February, excluding the major holiday season. Booking at least six to eight weeks in advance is highly recommended to secure competitive pricing for this popular transcontinental route.
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.