Seattle-Tacoma International Airport
14 miles (23 km) from the city centre. 52.7 million passengers in 2025
| How | Route | Time | Cost |
|---|---|---|---|
| Train | Sound Transit Link 1 Line from SeaTac/Airport station to Westlake in downtown Seattle | about 38m | $3.00 one way |
Flights from IAD to SEA
3 airlines fly nonstop from Washington Dulles International Airport to Seattle-Tacoma International Airport. Washington Dulles International Airport (Washington, D.C.) to Seattle-Tacoma International Airport (Seattle).
- Distance
- 2,300 mi
- Nonstop flight
- Varies
- Time difference
- −3h
- Nonstop airlines
- 3
Fares from IAD to SEA
Checking today’s fares with the airlines.
Nonstop flights
| Airline | From | To |
|---|---|---|
| Alaska Airlines | IAD Washington Dulles International Airport | SEA Seattle-Tacoma International Airport |
| Delta Air Lines | IAD Washington Dulles International Airport | SEA Seattle-Tacoma International Airport |
| United Airlines | IAD Washington Dulles International Airport | SEA Seattle-Tacoma International Airport |
Nonstop service as of October 2026. Airlines change schedules seasonally.
Getting from the airport into Seattle
Before you go
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.
Seattle is 3 hours behind Washington, D.C.. Seattle uses the US dollar (USD).
Read the Seattle guide: when to go, weather, airports and tips
Frequently asked questions
How long is the flight from IAD to SEA?
Nonstop flight times vary by airline and season; flights with a connection take longer.
Which airlines fly nonstop from IAD to SEA?
As of October 2026, Alaska Airlines, Delta Air Lines and United Airlines fly this route nonstop.
How far is SEA from IAD?
About 2,300 miles (3,702 km) between the airports.
What is the time difference?
Seattle is 3 hours behind Washington, D.C..
What ID do I need to fly to 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.
How do I get from Seattle-Tacoma International Airport into Seattle?
Sound Transit Link 1 Line from SeaTac/Airport station to Westlake in downtown Seattle, about 38 minutes, $3.00 one way.
Related pages
Sources
Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.