Direct (nonstop) flights from Seattle to Dulles
3 airlines fly nonstop from Seattle Tacoma International (SEA) to Washington Dulles International (IAD). It's 2,305 miles (3,710 km), about 5h 2m in the air. Operated by Alaska Airlines, Delta Air Lines, United Airlines.
Alaska Airlines
Delta Air Lines
United Airlines
Route data last updated: May 26, 2026
Airlines with non-stop flights
AS
Alaska Airlines
DL
Delta Air Lines
UA
United Airlines
Alternative Routes
Other ways to fly from Seattle to Dulles with one stop · direct emits 390 kg CO₂ per passenger
Looking for the return flight?
IAD → SEA: Flights from Dulles to SeattleOther direct flights from Seattle
Direct flights from Dulles (IAD)
Frequently Asked Questions
How long is the direct flight from Seattle to Dulles?
A nonstop flight from Seattle (SEA) to Dulles (IAD) takes approximately 5 hours and 2 minutes. The distance is 2,305 miles (3,710 km).
Which airlines fly nonstop from Seattle to Dulles?
3 airlines: Alaska Airlines, Delta Air Lines, United Airlines.
Is there a nonstop flight from Seattle to Dulles?
Yes. 3 airlines: Alaska Airlines, Delta Air Lines, United Airlines.
How far is Seattle from Dulles?
The flight distance from Seattle to Dulles is 2,305 miles (3,710 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as New York to Los Angeles.
What type of aircraft flies from Seattle to Dulles?
At 5h 2m, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Seattle to Dulles?
Roughly 390 kg CO2 per passenger one-way. That's about the same as driving 1,950 km.
Is the return flight from Dulles to Seattle also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Seattle to Dulles?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Seattle Tacoma International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.