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 $154
Frontier Nonstop 3 hr Sat, Jun 6 — Mon, Jun 8
The cheapest round-trip flight from St. Louis to Denver is currently $154
Cheapest one-way flight $64
Frontier Nonstop 3 hr Tue, Jun 2
The cheapest one-way flight from St. Louis to Denver is currently $64
Cheapest nonstop flights $154
Frontier Nonstop 3 hr Thu, May 28 — Mon, Jun 1
The cheapest nonstop round-trip flight from St. Louis to Denver is currently $154
Last-minute weekend getaway $256
Frontier 1 stop 23 hr Thu, May 7 — Mon, May 11
The cheapest last-minute weekend getaway from St. Louis to Denver is currently $256
Cheapest business class flights $402
Frontier Nonstop 3 hr Sat, Jun 6 — Mon, Jun 8
The cheapest business class round-trip flight from St. Louis to Denver is currently $402
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: $165–300

Popular airlines from St. Louis to Denver

  • Southwest
    Nonstop
    from $309
    Typical price: $200–410
    43 weekly nonstop flights
    STL - DEN Every day
    845 weekly connecting flights
    STL - DEN Every day
  • United
    Nonstop
    from $309
    Typical price: $210–450
    19 weekly nonstop flights
    STL - DEN Every day
    449 weekly connecting flights
    STL - DEN Every day
  • American
    from $329
    Typical price: $225–510
    312 weekly connecting flights
    STL - DEN Every day
  • Frontier
    Nonstop
    from $154
    Typical price: $110–270
    5 weekly nonstop flights
    STL - DEN Every Mon, Thu, Fri, Sat, Sun
    19 weekly connecting flights
    STL - DEN Every day
  • Delta
    from $329
    Typical price: $230–590
    239 weekly connecting flights
    STL - DEN Every day
  • Alaska
    from $603
    Typical price: $420–930
    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 36 min 143 mi
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 8 min 109 mi
  • Indianapolis International Airport (IND)
    Indianapolis United States 3 hr 30 min 222 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
  • Centennial Airport (APA)
    Denver United States 27 min 14 mi
  • Eagle County Regional Airport (EGE)
    Vail United States 2 hr 19 min 103 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 $154. The cheapest one-way flight was with Frontier from $64.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Denver is $309, flying from May 28 to Jun 1.
  • The cheapest United flight from St. Louis to Denver is $309, flying from May 28 to Jun 1.
  • The cheapest American flight from St. Louis to Denver is $329, flying from Jun 4 to Jun 8.
  • The cheapest Frontier flight from St. Louis to Denver is $154, flying from Jun 6 to Jun 8.
  • The cheapest Delta flight from St. Louis to Denver is $329, flying from Jun 4 to Jun 8.
  • The cheapest Alaska flight from St. Louis to Denver is $603, flying from Jun 5 to Jun 7.
The cheapest round-trip flight from St. Louis to Denver starts at $154 from Sat, Jun 6 to Mon, Jun 8. The cheapest one-way flight starts at $64 and departs on Tue, Jun 2.
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 43 nonstop flights and 845 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 19 nonstop flights and 449 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • American offers 312 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Frontier offers 5 nonstop flights and 19 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Delta offers 239 connecting flights per week. Delta 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 $154. The cheapest one-way flight was with Frontier from $64.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Denver is $309, flying from May 28 to Jun 1.
  • The cheapest United flight from St. Louis to Denver is $309, flying from May 28 to Jun 1.
  • The cheapest American flight from St. Louis to Denver is $329, flying from Jun 4 to Jun 8.
  • The cheapest Frontier flight from St. Louis to Denver is $154, flying from Jun 6 to Jun 8.
  • The cheapest Delta flight from St. Louis to Denver is $329, flying from Jun 4 to Jun 8.
  • The cheapest Alaska flight from St. Louis to Denver is $603, flying from Jun 5 to Jun 7.
Southwest, United and Frontier fly direct from St. Louis to Denver.
  • There are 43 Southwest direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 19 United direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 5 Frontier direct flights from St. Louis to Denver per week. Flights are available on Monday, Thursday, Friday, Saturday and Sunday.
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 $256 is offered by Frontier from Thu, May 7 to Mon, May 11.
Southwest, United and Frontier fly direct from St. Louis to Denver.
  • There are 43 Southwest direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 19 United direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 5 Frontier direct flights from St. Louis to Denver per week. Flights are available on Monday, Thursday, Friday, Saturday and Sunday.
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 $154 from Thu, May 28 to Mon, Jun 1 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 $402 from Sat, Jun 6 to Mon, Jun 8 with Frontier.
The cheapest economy class round-trip flights between St. Louis and Denver start at $154 from Sat, Jun 6 to Mon, Jun 8.
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 $256 from Thu, May 7 to Mon, May 11 with Frontier.
The cheapest last-minute deal between St. Louis and Denver at price $256 is offered by Frontier from Thu, May 7 to Mon, May 11.
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. Denver
    $108
    Aug 13 — Aug 17
    Nonstop 2 hr 36 min Frontier
  2. London
    $997
    Oct 29 — Nov 2
    1 stop 10 hr 30 min American, British Airways
  3. Seattle
    $345
    May 30 — Jun 1
    1 stop 7 hr 50 min United
  4. Atlanta
    $56
    Jun 4 — Jun 8
    Nonstop 1 hr 50 min Frontier

Find cheap flights from St. Louis to anywhere

Find cheap flights on popular routes