Direct (nonstop) flights from Saint Louis to Denver
3 airlines fly nonstop from Saint Louis Airport (STL) to Denver International (DEN). It's 769 miles (1,237 km), about 2h 25m in the air. Operated by Frontier Airlines, United Airlines, Southwest Airlines.
Frontier Airlines
United Airlines
Southwest Airlines
Route data last updated: May 29, 2026
Airlines with non-stop flights
F9
Frontier Airlines
UA
United Airlines
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Saint Louis to Denver with one stop · direct emits 142 kg CO₂ per passenger
Looking for the return flight?
DEN → STL: Flights from Denver to Saint LouisOther direct flights from Saint Louis
Direct flights from Denver (DEN)
Frequently Asked Questions
How long is the direct flight from Saint Louis to Denver?
A nonstop flight from Saint Louis (STL) to Denver (DEN) takes approximately 2 hours and 25 minutes. The distance is 769 miles (1,237 km).
Which airlines fly nonstop from Saint Louis to Denver?
3 airlines: Frontier Airlines, United Airlines, Southwest Airlines.
Is there a nonstop flight from Saint Louis to Denver?
Yes. 3 airlines: Frontier Airlines, United Airlines, Southwest Airlines.
How far is Saint Louis from Denver?
The flight distance from Saint Louis to Denver is 769 miles (1,237 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as London to Madrid.
What type of aircraft flies from Saint Louis to Denver?
At 2h 25m, 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 Denver?
Roughly 142 kg CO2 per passenger one-way. That's about the same as driving 710 km.
Is the return flight from Denver 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 Denver?
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.