2 airlines fly nonstop from Seattle-Tacoma International Airport to Baltimore/Washington International Thurgood Marshall Airport. Seattle-Tacoma International Airport (Seattle) to Baltimore/Washington International Thurgood Marshall Airport (Washington, D.C.).
Checking today’s fares with the airlines.
| Airline | From | To |
|---|---|---|
| Alaska Airlines | SEA Seattle-Tacoma International Airport | BWI Baltimore/Washington International Thurgood Marshall Airport |
| Southwest AirlinesSeasonal | SEA Seattle-Tacoma International Airport | BWI Baltimore/Washington International Thurgood Marshall Airport |
Nonstop service as of October 2026. Airlines change schedules seasonally.
31 miles (50 km) from the city centre. 27.1 million passengers in 2024
| How | Route |
|---|---|
| Train | MARC Penn Line or Amtrak from BWI Rail Station (free shuttle bus from terminal) to Washington Union Station |
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 and Southwest Airlines fly this route nonstop, some of them seasonally.
About 2,329 miles (3,748 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.
MARC Penn Line or Amtrak from BWI Rail Station (free shuttle bus from terminal) to Washington Union Station.
Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.