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 $76
Frontier Nonstop 3 hr Sat, Nov 15 — Sun, Nov 16
The cheapest round-trip flight from St. Louis to Denver is currently $76
Cheapest one-way flight $34
Frontier Nonstop 3 hr Wed, Oct 29
The cheapest one-way flight from St. Louis to Denver is currently $34
Last-minute weekend getaway $197
Frontier Nonstop 3 hr Fri, Oct 17 — Mon, Oct 20
The cheapest last-minute weekend getaway from St. Louis to Denver is currently $197
Cheapest business class flights $467
United Nonstop 3 hr Thu, Nov 6 — Mon, Nov 10
The cheapest business class round-trip flight from St. Louis to Denver is currently $467
Fastest flight 2 hr 15 min The fastest nonstop flight from St. Louis to Denver takes 2 hr 15 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 January. The most expensive month to fly is typically June.
January
Cheapest
Typical prices: $85–220
June
Most expensive
Typical prices: $165–305

Popular airlines from St. Louis to Denver

  • Southwest
    Nonstop
    from $177
    Typical price: $195–385
    42 weekly nonstop flights
    STL - DEN Every day
    972 weekly connecting flights
    STL - DEN Every day
  • United
    Nonstop
    from $177
    Typical price: $215–435
    28 weekly nonstop flights
    STL - DEN Every day
    328 weekly connecting flights
    STL - DEN Every day
  • Frontier
    Nonstop
    from $76
    Typical price: $105–300
    7 weekly nonstop flights
    STL - DEN Every day
    24 weekly connecting flights
    STL - DEN Every Mon, Thu, Fri, Sat, Sun
  • American
    from $202
    Typical price: $220–475
    280 weekly connecting flights
    STL - DEN Every day
  • Delta
    from $207
    Typical price: $230–530
    241 weekly connecting flights
    STL - DEN Every day
  • Alaska
    from $314
    Typical price: $450–920
    21 weekly connecting flights
    STL - DEN Every day

Popular airports near St. Louis

  • St. Louis Lambert International Airport (STL)
    St. Louis United States 22 min 12 mi
  • General Wayne A. Downing Peoria International Airport (PIA)
    Peoria United States 2 hr 35 min 143 mi
  • Indianapolis International Airport (IND)
    Indianapolis United States 3 hr 28 min 222 mi
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 3 min 109 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 25 min 66 mi
  • Centennial Airport (APA)
    Denver United States 26 min 14 mi
  • Eagle County Regional Airport (EGE)
    Vail United States 2 hr 15 min 103 mi

Frequently asked questions about flying from St. Louis to Denver

When are the cheapest days to fly from St. Louis to Denver?
The cheapest flights from St. Louis to Denver are usually in January. Typical ticket prices in January range from $85 to $220.
Which airlines provide the cheapest flights from St. Louis to Denver?
The cheapest round-trip flight from St. Louis to Denver recently found on Google Flights was with Frontier from $76. The cheapest one-way flight was with Frontier from $34.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Denver is $177, flying from Dec 6 to Dec 8.
  • The cheapest United flight from St. Louis to Denver is $177, flying from Dec 13 to Dec 15.
  • The cheapest Frontier flight from St. Louis to Denver is $76, flying from Nov 15 to Nov 16.
  • The cheapest American flight from St. Louis to Denver is $202, flying from Nov 15 to Nov 16.
  • The cheapest Delta flight from St. Louis to Denver is $207, flying from Dec 6 to Dec 8.
  • The cheapest Alaska flight from St. Louis to Denver is $314, flying from Nov 15 to Nov 17.
What are the cheapest flights from St. Louis to Denver?
The cheapest round-trip flight from St. Louis to Denver starts at $76 from Sat, Nov 15 to Sun, Nov 16. The cheapest one-way flight starts at $34 and departs on Wed, Oct 29.
How long does it take to fly from St. Louis to Denver?
2 hr 15 min is the shortest flight time from St. Louis to Denver.
When should you fly to Denver, United States?
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.
How do I find cheap dates to fly from St. Louis to Denver?
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 is the best airline to fly from St. Louis to Denver?
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 42 nonstop flights and 972 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 28 nonstop flights and 328 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Frontier offers 7 nonstop flights and 24 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • American offers 280 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Denver International Airport (DEN) .
  • Delta offers 241 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.
Which airlines provide the cheapest flights from St. Louis to Denver?
The cheapest round-trip flight from St. Louis to Denver recently found on Google Flights was with Frontier from $76. The cheapest one-way flight was with Frontier from $34.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Denver is $177, flying from Dec 6 to Dec 8.
  • The cheapest United flight from St. Louis to Denver is $177, flying from Dec 13 to Dec 15.
  • The cheapest Frontier flight from St. Louis to Denver is $76, flying from Nov 15 to Nov 16.
  • The cheapest American flight from St. Louis to Denver is $202, flying from Nov 15 to Nov 16.
  • The cheapest Delta flight from St. Louis to Denver is $207, flying from Dec 6 to Dec 8.
  • The cheapest Alaska flight from St. Louis to Denver is $314, flying from Nov 15 to Nov 17.
Which airlines have direct flights from St. Louis to Denver?
Southwest, United and Frontier fly direct from St. Louis to Denver.
  • There are 42 Southwest direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 28 United direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 7 Frontier direct flights from St. Louis to Denver per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
Which airline provides the cheapest last-minute getaway flight from St. Louis to Denver?
The cheapest last-minute deal between St. Louis and Denver at price $197 is offered by Frontier from Fri, Oct 17 to Mon, Oct 20.
Which airlines have direct flights from St. Louis to Denver?
Southwest, United and Frontier fly direct from St. Louis to Denver.
  • There are 42 Southwest direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 28 United direct flights from St. Louis to Denver per week. Flights are available every day.
  • There are 7 Frontier direct flights from St. Louis to Denver per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
When are direct flights from St. Louis to Denver available?
There are direct flights from St. Louis to Denver on a daily basis.
What are the cheapest direct flights from St. Louis to Denver?
The cheapest direct (nonstop) round-trip flights between St. Louis and Denver start at $76 from Sat, Nov 15 to Sun, Nov 16 with Frontier.
How can I find nonstop flights from St. Louis to Denver?
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.
What are the cheapest business class flights from St. Louis to Denver?
The cheapest business class round-trip flights between St. Louis and Denver start at $467 from Thu, Nov 6 to Mon, Nov 10 with United.
What are the cheapest economy class flights from St. Louis to Denver?
The cheapest economy class round-trip flights between St. Louis and Denver start at $76 from Sat, Nov 15 to Sun, Nov 16.
How can I book business class trips from St. Louis to Denver?
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.
Are there any last-minute deals from St. Louis to Denver next weekend?
The best last-minute getaway deal for the next weekend between St. Louis and Denver starts at $197 from Fri, Oct 17 to Mon, Oct 20 with Frontier.
Which airline provides the cheapest last-minute getaway flight from St. Louis to Denver?
The cheapest last-minute deal between St. Louis and Denver at price $197 is offered by Frontier from Fri, Oct 17 to Mon, Oct 20.
How can I find last-minute flight deals from St. Louis to Denver?
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

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