Cheap flights from St. Louis to Denver

Flights overview

Useful information for finding cheap flights from St. Louis to Denver and booking your next trip
Cheapest round-trip flights $79
Frontier Nonstop 3 hr Sat, Apr 25 — Mon, Apr 27
The cheapest round-trip flight from St. Louis to Denver is currently $79
Cheapest one-way flight $33
Frontier Nonstop 3 hr Sat, Apr 25
The cheapest one-way flight from St. Louis to Denver is currently $33
Last-minute weekend getaway $173
Frontier Nonstop 3 hr Sat, Mar 14 — Mon, Mar 16
The cheapest last-minute weekend getaway from St. Louis to Denver is currently $173
Cheapest business class flights $293
Frontier Nonstop 3 hr Sat, Apr 25 — Mon, Apr 27
The cheapest business class round-trip flight from St. Louis to Denver is currently $293
Fastest flight 2 hr 10 min The fastest nonstop flight from St. Louis to Denver takes 2 hr 10 min
Nonstop flights Every day There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from St. Louis to Denver is typically November. The most expensive month to fly is typically June.
November
Cheapest
Typical prices: $90–270
June
Most expensive
Typical prices: $165–305

Popular airlines from St. Louis to Denver

  • Southwest
    Nonstop
    from $189
    Typical price: $200–400
    44 weekly nonstop flights
    STL - DEN Every day
    979 weekly connecting flights
    STL - DEN Every day
  • United
    Nonstop
    from $189
    Typical price: $205–450
    26 weekly nonstop flights
    STL - DEN Every day
    410 weekly connecting flights
    STL - DEN Every day
  • American
    from $217
    Typical price: $225–495
    258 weekly connecting flights
    STL - DEN Every day
  • Delta
    from $209
    Typical price: $225–570
    252 weekly connecting flights
    STL - DEN Every day
  • Frontier
    Nonstop
    from $79
    Typical price: $110–285
    4 weekly nonstop flights
    STL - DEN Every Mon, Wed, Fri, Sat
    24 weekly connecting flights
    STL - DEN Every day
  • Alaska
    from $383
    Typical price: $415–890
    21 weekly connecting flights
    STL - DEN Every day

Popular airports near St. Louis

  • St. Louis Lambert International Airport (STL)
    St. Louis United States 21 min 12 mi
  • General Wayne A. Downing Peoria International Airport (PIA)
    Peoria United States 2 hr 35 min 143 mi
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 7 min 109 mi
  • MidAmerica St. Louis Airport (BLV)
    Belleville United States 34 min 20 mi

Popular airports near Denver

  • Denver International Airport (DEN)
    Denver United States 38 min 19 mi
  • Colorado Springs Airport (COS)
    Colorado Springs United States 1 hr 27 min 66 mi
  • Eagle County Regional Airport (EGE)
    Vail United States 2 hr 19 min 103 mi
  • Centennial Airport (APA)
    Denver United States 27 min 14 mi

Frequently asked questions about flying from St. Louis to Denver

The cheapest flights from St. Louis to Denver are usually in November. Typical ticket prices in November range from $90 to $270.
The cheapest round-trip flight from St. Louis to Denver recently found on Google Flights was with Frontier from $79. The cheapest one-way flight was with Frontier from $33.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Denver is $189, flying from Apr 25 to Apr 27.
  • The cheapest United flight from St. Louis to Denver is $189, flying from May 9 to May 11.
  • The cheapest American flight from St. Louis to Denver is $217, flying from Apr 25 to Apr 26.
  • The cheapest Delta flight from St. Louis to Denver is $209, flying from Apr 18 to Apr 20.
  • The cheapest Frontier flight from St. Louis to Denver is $79, flying from Apr 25 to Apr 27.
  • The cheapest Alaska flight from St. Louis to Denver is $383, flying from Apr 23 to Apr 27.
The cheapest round-trip flight from St. Louis to Denver starts at $79 from Sat, Apr 25 to Mon, Apr 27. The cheapest one-way flight starts at $33 and departs on Sat, Apr 25.
2 hr 10 min is the shortest flight time from St. Louis to Denver.
Denver’s mild summer months (Jun–Aug) are a popular time for visitors exploring the city and nearby national parks. The ski season runs through winter (Nov–Mar). Major events include the National Western Stock Show & Rodeo (Jan) and A Taste of Colorado (Sep) food and arts festival.
It's easy to use Google Flights to find the cheapest days to fly from St. Louis to Denver.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from St. Louis to Denver really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from St. Louis to Denver.

In terms of nonstop flights, Southwest is the most popular. Southwest offers 44 nonstop flights and 979 connecting flights per week. Southwest flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .

Other popular airlines flying from St. Louis to Denver are:
  • United offers 26 nonstop flights and 410 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • American offers 258 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Delta offers 252 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Frontier offers 4 nonstop flights and 24 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Alaska offers 21 connecting flights per week. Alaska flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
The number of connecting flights refers to distinct flights with at least one stop between St. Louis and Denver.
The cheapest round-trip flight from St. Louis to Denver recently found on Google Flights was with Frontier from $79. The cheapest one-way flight was with Frontier from $33.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Denver is $189, flying from Apr 25 to Apr 27.
  • The cheapest United flight from St. Louis to Denver is $189, flying from May 9 to May 11.
  • The cheapest American flight from St. Louis to Denver is $217, flying from Apr 25 to Apr 26.
  • The cheapest Delta flight from St. Louis to Denver is $209, flying from Apr 18 to Apr 20.
  • The cheapest Frontier flight from St. Louis to Denver is $79, flying from Apr 25 to Apr 27.
  • The cheapest Alaska flight from St. Louis to Denver is $383, flying from Apr 23 to Apr 27.
Southwest, United and Frontier fly direct from St. Louis to Denver.
  • There are 44 Southwest direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 26 United direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 4 Frontier direct flights from St. Louis to Denver per week. Flights are available on Monday, Wednesday, Friday and Saturday.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between St. Louis and Denver at price $173 is offered by Frontier from Sat, Mar 14 to Mon, Mar 16.
Southwest, United and Frontier fly direct from St. Louis to Denver.
  • There are 44 Southwest direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 26 United direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 4 Frontier direct flights from St. Louis to Denver per week. Flights are available on Monday, Wednesday, Friday and Saturday.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are direct flights from St. Louis to Denver on a daily basis.
The cheapest direct (nonstop) round-trip flights between St. Louis and Denver start at $79 from Sat, Apr 25 to Mon, Apr 27 with Frontier.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from St. Louis to Denver, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between St. Louis and Denver start at $293 from Sat, Apr 25 to Mon, Apr 27 with Frontier.
The cheapest economy class round-trip flights between St. Louis and Denver start at $79 from Sat, Apr 25 to Mon, Apr 27.
To book business class trips from St. Louis to Denver, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between St. Louis and Denver starts at $173 from Sat, Mar 14 to Mon, Mar 16 with Frontier.
The cheapest last-minute deal between St. Louis and Denver at price $173 is offered by Frontier from Sat, Mar 14 to Mon, Mar 16.
To find last-minute flight deals from St. Louis to Denver, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

Search more flights

Popular trips from St. Louis

  1. London
    $779
    May 1 — May 3
    1 stop 11 hr 30 min Air Canada, Lufthansa, Lufthansa City Airlines
  2. Denver
    $79
    Apr 18 — Apr 20
    Nonstop 2 hr 33 min Frontier
  3. Atlanta
    $92
    Apr 18 — Apr 20
    Nonstop 1 hr 46 min Frontier
  4. Seattle
    $297
    Apr 9 — Apr 12
    Nonstop 4 hr 35 min Alaska

Find cheap flights from St. Louis to anywhere

Find cheap flights on popular routes