3 airlines fly nonstop from Seattle-Tacoma International Airport to Washington Dulles International Airport. Seattle-Tacoma International Airport (Seattle) to Washington Dulles International Airport (Washington, D.C.).
Checking today’s fares with the airlines.
| Airline | From | To |
|---|---|---|
| Alaska Airlines | SEA Seattle-Tacoma International Airport | IAD Washington Dulles International Airport |
| Delta Air Lines | SEA Seattle-Tacoma International Airport | IAD Washington Dulles International Airport |
| United Airlines | SEA Seattle-Tacoma International Airport | IAD Washington Dulles International Airport |
Nonstop service as of October 2026. Airlines change schedules seasonally.
26 miles (42 km) from the city centre. 29 million passengers in 2025
| How | Route | Time | Cost |
|---|---|---|---|
| Subway | Metro Silver Line from Dulles Airport station to Metro Center | about 53m | standard distance-based Metro fare, no airport surcharge |
This is domestic travel for US citizens: no passport or visa is needed, but travelers 18 and over need a REAL ID-compliant license or another accepted ID to fly.
Washington, D.C. is 3 hours ahead of Seattle. Washington, D.C. uses the US dollar (USD).
Read the Washington, D.C. guide: when to go, weather, airports and tips
Nonstop flight times vary by airline and season; flights with a connection take longer.
As of October 2026, Alaska Airlines, Delta Air Lines and United Airlines fly this route nonstop.
About 2,300 miles (3,702 km) between the airports.
Washington, D.C. is 3 hours ahead of Seattle.
This is domestic travel for US citizens: no passport or visa is needed, but travelers 18 and over need a REAL ID-compliant license or another accepted ID to fly.
Metro Silver Line from Dulles Airport station to Metro Center, about 53 minutes, standard distance-based Metro fare, no airport surcharge.
Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.