Direct (nonstop) flights from Saint Louis to Seattle
2 airlines fly nonstop from Saint Louis Airport (STL) to Seattle Tacoma International (SEA). It's 1,708 miles (2,749 km), about 4h 33m in the air. Operated by Alaska Airlines, Southwest Airlines.
Alaska Airlines
Southwest Airlines
Route data last updated: May 27, 2026
Airlines with non-stop flights
AS
Alaska Airlines
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Saint Louis to Seattle with one stop · direct emits 289 kg CO₂ per passenger
Looking for the return flight?
SEA → STL: Flights from Seattle to Saint LouisOther direct flights from Saint Louis
Direct flights from Seattle (SEA)
Frequently Asked Questions
How long is the direct flight from Saint Louis to Seattle?
A nonstop flight from Saint Louis (STL) to Seattle (SEA) takes approximately 4 hours and 33 minutes. The distance is 1,708 miles (2,749 km).
Which airlines fly nonstop from Saint Louis to Seattle?
2 airlines: Alaska Airlines, Southwest Airlines.
Is there a nonstop flight from Saint Louis to Seattle?
Yes. 2 airlines: Alaska Airlines, Southwest Airlines.
How far is Saint Louis from Seattle?
The flight distance from Saint Louis to Seattle is 1,708 miles (2,749 km), measured as the great-circle (shortest air) distance.
What type of aircraft flies from Saint Louis to Seattle?
At 4h 33m, 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 Saint Louis to Seattle?
Roughly 289 kg CO2 per passenger one-way. That's about the same as driving 1,445 km.
Is the return flight from Seattle to Saint Louis 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 Saint Louis 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 Saint Louis Airport for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.