Direct (nonstop) flights from Dulles to Seattle
3 airlines fly nonstop from Washington Dulles International (IAD) to Seattle Tacoma International (SEA). It's 2,305 miles (3,710 km), about 5h 48m 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 Dulles to Seattle with one stop · direct emits 390 kg CO₂ per passenger
Looking for the return flight?
SEA → IAD: Flights from Seattle to DullesOther direct flights from Dulles
Direct flights from Seattle (SEA)
Frequently Asked Questions
How long is the direct flight from Dulles to Seattle?
A nonstop flight from Dulles (IAD) to Seattle (SEA) takes approximately 5 hours and 48 minutes. The distance is 2,305 miles (3,710 km).
Which airlines fly nonstop from Dulles to Seattle?
3 airlines: Alaska Airlines, Delta Air Lines, United Airlines.
Is there a nonstop flight from Dulles to Seattle?
Yes. 3 airlines: Alaska Airlines, Delta Air Lines, United Airlines.
How far is Dulles from Seattle?
The flight distance from Dulles to Seattle 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 Dulles to Seattle?
At 5h 48m, 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 Dulles to Seattle?
Roughly 390 kg CO2 per passenger one-way. That's about the same as driving 1,950 km.
Is the return flight from Seattle to Dulles 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 Dulles to Seattle?
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 Washington Dulles International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.