Domestic route
Cheap flights from Denver to St. Louis
Denver International Airport (DEN) to St. Louis Lambert International Airport (STL). 767 miles, 2h nonstop.
DEN to STL 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 Sunday
- Time difference
- 1h aheadSt. Louis vs Denver
Denver to St. Louis
Round trips from $63
Per traveler, taxes and fees included. Lowest fare we found departs Sat, Jan 9.
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 WhatsAppDenver to St. Louis 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 Denver to St. Louis
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 DEN to STL 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.
- January 2027 is the cheapest month to fly over the next six months, with round trips from $63; September 2026 is the most expensive at $89 and up, a difference of $26 per traveler.
- Departing on a Tuesday averages 19% less than a Sunday 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.
Ready to compare live fares?
See every airline on DEN–STL side by side with bags and seat rules spelled out.
Search Denver to St. LouisDenver to St. Louis: common questions
How long is the flight from Denver to St. Louis?
A nonstop flight from Denver (DEN) to St. Louis (STL) 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 DEN to STL?
American Airlines, United Airlines, Southwest Airlines, Frontier Airlines, Sun Country Airlines and Breeze Airways operate nonstop flights from Denver (DEN) to St. Louis (STL), with 26 nonstop departures a day between them. One-stop options connect through MSP and DFW.
What is the cheapest month to fly from Denver to St. Louis?
Over the next six months, January 2027 has the lowest round-trip fares from Denver (DEN) to St. Louis (STL), 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 Denver to St. Louis 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 Denver and St. Louis?
St. Louis is 1 hour ahead of Denver. DEN is on America/Denver time and STL on America/Chicago time. Departure and arrival times in search results are always shown in local time at each airport.
Related routes
Other popular city pairs from the same departure city and to the same destination, with the lowest round-trip fares we found.