Domestic route
Cheap flights from St. Louis to Denver
St. Louis Lambert International Airport (STL) to Denver International Airport (DEN). 767 miles, 2h nonstop.
STL to DEN at a glance
Computed from airline schedules and the fares we track for this route. Refreshed several times a day.
- Distance
- 767 milesgreat-circle
- Typical flight time
- 2hnonstop, gate to gate
- Nonstop airlines
- AAUAWNF96 airlinesAmerican, United, Southwest
- Nonstop flights per day
- 26all airlines combined
- Cheapest month
- January 2027over the next six months
- Best day to fly
- Tuesday19% less than Friday
- Time difference
- 1h behindDenver vs St. Louis
St. Louis to Denver
Round trips from $63
Per traveler, taxes and fees included. Lowest fare we found departs Wed, Jan 13.
Cheapest month: January 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppSt. Louis to Denver fares by month
Lowest round-trip economy fare per traveler in each of the next six months, taxes and fees included. Select a month to search that date.
Airlines flying St. Louis to Denver
6 airlines fly nonstop with 26 departures a day combined, plus 2 more with one stop.
- WNSouthwest AirlinesLow-costNonstop · 10 flights a day · first checked bag from $35
- UAUnited AirlinesStar AllianceNonstop · 7 flights a day · first checked bag from $40
- F9Frontier AirlinesLow-costNonstop · 3 flights a day · first checked bag from $55
- AAAmerican AirlinesoneworldNonstop · 2 flights a day · first checked bag from $40
- MXBreeze AirwaysLow-costNonstop · 2 flights a day · first checked bag from $45
- SYSun Country AirlinesLow-costNonstop · 2 flights a day · first checked bag from $45
- DLDelta Air LinesSkyTeamConnecting via MSP · first checked bag from $35
- NKSpirit AirlinesLow-costConnecting via DFW · first checked bag from $55
Connecting options
Hubs where one airline can carry you on both legs, most choices first.
- Minneapolis (MSP)DL1 airline
- Dallas (DFW)NK1 airline
Tips for this route
- American, United, Southwest and Frontier all fly STL to DEN nonstop, so compare the total with bags before picking the lowest base fare: the difference between a basic and a standard economy ticket is often less than one checked bag each way.
- Departing on a Tuesday averages 19% less than a Friday on this route. If your dates are flexible, shift the outbound by a day or two and check the calendar view before you book.
- Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks.
Destination guide
Denver: Mile-high base camp for the Rockies
Denver International is the third-busiest airport in the country and a hub for United, Southwest and Frontier, which keeps fares low from every direction. The city itself is a lively base for the Rockies, with ski resorts 90 minutes away.
Best time to visit: June–September for hiking and Red Rocks concerts; December–March for skiing. Spring can swing from snow to 70°F in a week; September is dependably dry and golden.
Flying the other way? Denver to St. LouisFares, airlines and tips for DEN to STL.Ready to compare live fares?
See every airline on STL–DEN side by side with bags and seat rules spelled out.
Search St. Louis to DenverSt. Louis to Denver: common questions
How long is the flight from St. Louis to Denver?
A nonstop flight from St. Louis (STL) to Denver (DEN) takes about 2h gate to gate, covering 767 miles. Connecting itineraries add the layover, typically 1 to 3 hours more in total.
Which airlines fly nonstop from STL to DEN?
American Airlines, United Airlines, Southwest Airlines, Frontier Airlines, Sun Country Airlines and Breeze Airways operate nonstop flights from St. Louis (STL) to Denver (DEN), with 26 nonstop departures a day between them. One-stop options connect through MSP and DFW.
What is the cheapest month to fly from St. Louis to Denver?
Over the next six months, January 2027 has the lowest round-trip fares from St. Louis (STL) to Denver (DEN), starting at $63 per traveler including taxes and fees. Within any month, Tuesday departures average the lowest prices.
How far in advance should I book St. Louis to Denver flights?
Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks. Air1 Tickets includes free cancellation within 24 hours of booking on every fare, so you can lock in a good price and keep looking.
What is the time difference between St. Louis and Denver?
Denver is 1 hour behind St. Louis. STL is on America/Chicago time and DEN on America/Denver time. Departure and arrival times in search results are always shown in local time at each airport.
Related routes
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