Saint Louis (STL) to Denver (DEN) flights
3 airlines fly nonstop from Saint Louis (STL) to Denver (DEN): Frontier Airlines, Southwest Airlines and United Airlines. The two airports are 767 miles (1,235 km) apart. United Airlines is in Star Alliance. There are also 19 ways to fly it with one stop, through Kansas City, Omaha and Minneapolis and more.
Airlines flying nonstop from STL to DEN
- Frontier AirlinesNot in an allianceWho books it
- Southwest AirlinesNot in an allianceWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book STL to DEN with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Air Canada AeroplanBooks United Airlines
- Air New Zealand AirpointsBooks United Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- JetBlue TrueBlueBooks United Airlines
- Lufthansa Miles & MoreBooks United Airlines
- Singapore Airlines KrisFlyerBooks United Airlines
- TAP Miles&GoBooks United Airlines
- Thai Royal Orchid PlusBooks United Airlines
- Turkish Airlines Miles&SmilesBooks United Airlines
- United MileagePlusBooks United Airlines
STL to DEN with one stop
19 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Kansas City (MCI)Southwest Airlines the whole way+1
- Via Omaha (OMA)Southwest Airlines the whole way
- Via Minneapolis (MSP)Delta Air Lines and Southwest Airlines the whole way
+2
- Via Chicago (ORD)American Airlines and United Airlines the whole way
- Via Chicago (MDW)Southwest Airlines the whole way
- Via Dallas (DFW)American Airlines and Frontier Airlines the whole way
- Via Dallas (DAL)Southwest Airlines the whole way
- Via Milwaukee (MKE)Southwest Airlines the whole way
- Via Nashville (BNA)Southwest Airlines the whole way
- Via Austin (AUS)Southwest Airlines the whole way+1
- Via Houston (IAH)United Airlines the whole way
- Via Salt Lake City (SLC)Delta Air Lines the whole way+1
- Via Detroit (DTW)Delta Air Lines and Southwest Airlines the whole way+1
- Via Columbus (CMH)Southwest Airlines the whole way
- Via Houston (HOU)Southwest Airlines the whole way
STL to DEN: common questions
Which airlines fly nonstop from STL to DEN?
Frontier Airlines, Southwest Airlines and United Airlines (Star Alliance) fly nonstop from Saint Louis (STL) to Denver (DEN).
How far is Saint Louis from Denver by plane?
Saint Louis (STL) and Denver (DEN) are 767 miles (1,235 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book STL to DEN award flights?
13 programs can book at least one of the nonstop airlines: Air Canada Aeroplan, Air New Zealand Airpoints, ANA Mileage Club, Avianca LifeMiles, Emirates Skywards, EVA Air Infinity MileageLands, JetBlue TrueBlue, Lufthansa Miles & More and 5 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does STL to DEN cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for STL to DEN with taxes and fees.
Where can I connect between Saint Louis and Denver?
The most direct connections are through Kansas City (MCI), Omaha (OMA), Minneapolis (MSP), Chicago (ORD) and Chicago (MDW). On 19 of them the same airline flies both flights, for example Southwest Airlines through Kansas City.
More routes
Routes are scheduled nonstop flights. The route data is refreshed monthly; this list was last checked November 11, 2026. Seasonal routes and new launches can be missing or end early, so confirm with the airline before you book. Distances are great-circle, the shortest path between the two airports.