Direct (nonstop) flights from Seattle to Saint Louis
2 airlines fly nonstop from Seattle Tacoma International (SEA) to Saint Louis Airport (STL). It's 1,708 miles (2,749 km), about 3h 59m 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 Seattle to Saint Louis with one stop · direct emits 289 kg CO₂ per passenger
Looking for the return flight?
STL → SEA: Flights from Saint Louis to SeattleOther direct flights from Seattle
Direct flights from Saint Louis (STL)
Frequently Asked Questions
How long is the direct flight from Seattle to Saint Louis?
A nonstop flight from Seattle (SEA) to Saint Louis (STL) takes approximately 3 hours and 59 minutes. The distance is 1,708 miles (2,749 km).
Which airlines fly nonstop from Seattle to Saint Louis?
2 airlines: Alaska Airlines, Southwest Airlines.
Is there a nonstop flight from Seattle to Saint Louis?
Yes. 2 airlines: Alaska Airlines, Southwest Airlines.
How far is Seattle from Saint Louis?
The flight distance from Seattle to Saint Louis is 1,708 miles (2,749 km), measured as the great-circle (shortest air) distance.
What type of aircraft flies from Seattle to Saint Louis?
At 3h 59m, 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 Saint Louis?
Roughly 289 kg CO2 per passenger one-way. That's about the same as driving 1,445 km.
Is the return flight from Saint Louis 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 Saint Louis?
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.