Flight Routes from St. Louis to Denver

Compare cheap outbound and return flights from St. Louis (STL) to Denver (DEN) and find the best offer from numerous airlines and travel agencies.

Trip type
Fastest flight
non-stop flights
123x / week
Flight distance
1,237 km
Time difference

Flight schedule from St. Louis (STL) to Denver (DEN)

Select a travel date in the flight schedule for the route from St. Louis (STL) to Denver (DEN) and compare affordable flight deals.

offers
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Matching outbound flightsSTL–DEN · 34 of 34
fromto
dep.arr.
durationstopovers
  1. September 13 – 19, 2026
  2. September 20 – 26, 2026
  3. Sep 27 – Oct 3, 2026
    1. STLDEN
      nonstop
      1. United Airlines
    2. STLDEN
      nonstop
      1. Southwest Airlines
    3. STLDEN
      nonstop
      1. Southwest Airlines
    4. STLDEN
      nonstop
      1. Southwest Airlines
    5. STLDEN
      nonstop
      1. Southwest Airlines
    6. STLDEN
      nonstop
      1. Southwest Airlines
    7. STLDEN
      nonstop
      1. Southwest Airlines
    8. STLDEN
      nonstop
      1. Southwest Airlines
    9. STLDEN
      nonstop
      1. Southwest Airlines
    10. STLDEN
      nonstop
      1. Southwest Airlines
    11. STLDEN
      nonstop
      1. Southwest Airlines
    12. STLDEN
      nonstop
      1. United Airlines
    13. STLDEN
      nonstop
      1. United Airlines
    14. STLDEN
      nonstop
      1. Southwest Airlines
    15. STLDEN
      nonstop
      1. Southwest Airlines

      Tips and tricks to help you find cheap flights from St. Louis to Denver

      Favorite airline: Frontier Airlines
      100 % of bookings on this flight route are made with Frontier Airlines, United Airlines and Delta.
      Frontier Airlines
      55 %
      United Airlines
      36 %
      Delta
      9 %
      Direct flights are cheaper
      Direct flights on this route are $162.00 cheaper on average than flights with a stopover.
      non stop flight
      1 stop
      02h 28min
      08h 30min
      117 $
      279 $
      The favorite connection is non-stop
      Non-stop flights are especially popular on this route. 88 % of travelers will book a direct flight.
      Route
      bookings
      Direct flights
      02h 28min, from 117 $
      88 %
      1 stopover Detroit Metropolitan Wayne County Airport, MI
      08h 30min, from 279 $
      12 %

      Important flight information

      Discover more flights around St. Louis and Denver

      Departure airport Airport St. Louis - Lambert International Airport (STL)
      Arrival airport Airport Denver International Airport, CO (DEN)
      Destination country Flights to United States
      Departure airport - Destination country St. Louis - Lambert International Airport - United States
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