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Flights from Denver to St. Louis Starting at $26

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

  • One way
  • Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to fly from Denver to St. Louis?

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Find cheap airlines flights from Denver to St. Louis

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines
From $26
Delta Air Lines
From $81
United Airlines
From $92
American Airlines
From $92
Southwest Airlines
From $104
Sun Country Airlines
From $140
Alaska Airlines
From $179
ANA airlines

Find more flights and airlines

Alternative Cheap Routes from Denver to St. Louis

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Denver to St. Louis.

  • Cheapest
    Frontier Airlines
    DEN
    06:41
    2h 6m
    Direct
    STL
    09:47
    Denver International Airport - St. Louis Lambert International Airport
    Wed, Apr 10Frontier Airlines
    $26
  • Frontier Airlines
    DEN
    06:41
    2h 6m
    Direct
    STL
    09:47
    Denver International Airport - St. Louis Lambert International Airport
    Wed, Apr 10Frontier Airlines
    $26
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from Denver (DEN) to St. Louis (STL) the cheapest?

    Airlines adjust prices for flights from Denver to St. Louis based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
  • How much do flights from Denver (DEN) to St. Louis (STL) cost?

    According to Trip.com's data, the lowest price is around $255.
  • How long does it take to fly from Denver (DEN) to St. Louis (STL) and what is the distance?

    It takes around 2 hours 25 minutes to fly from Denver (DEN) to St. Louis (STL).
  • What is the transportation method from the main airport to downtown in St. Louis?

    • The distance from St. Louis Lambert International Airport to downtown is about 20km. It takes about 40 minutes by taxi.
  • What are the most popular airlines that fly from Denver (DEN) to St. Louis (STL)?

    Airlines with flights from Denver (DEN) to St. Louis (STL): Southwest Airlines, Frontier Airlines, United Airlines and Volaris.

Travel Info | Denver to St. Louis

Cheapest nonstop flight price

$25

Cheapest round-trip ticket price

$55

Off-season for travel

January

Peak season for travel

September