Cheap Flight Tickets from St. Louis (STL) to Denver (DEN)

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Flights from St. Louis to Denver Starting at AU$ 30

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

One way
Return

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

Find the best time to fly from St. Louis to Denver

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.

Airlines Flying from St. Louis to Denver

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

Frontier Airlines

From AU$ 30

Sun Country Airlines

From AU$ 143

Delta Air Lines

From AU$ 145

American Airlines

From AU$ 149

United Airlines

From AU$ 176

Southwest Airlines

From AU$ 225

Alaska Airlines

From AU$ 268

ANA airlines

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Alternative Routes from St. Louis to Denver

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

Cheapest
STL
20:04
2h 31m
Direct
DEN
21:35
St. Louis Lambert International Airport - Denver International Airport
Wed, May 1Frontier Airlines
AU$ 30
STL
20:04
2h 31m
Direct
DEN
21:35
St. Louis Lambert International Airport - Denver International Airport
Wed, May 1Frontier Airlines
AU$ 30
Find More Flights

How do I find the cheapest flights?

When are flight from St. Louis (STL) to Denver (DEN) the cheapest?
Airlines adjust prices for flights from St. Louis to Denver based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much are flights from St. Louis (STL) to Denver (DEN) cost?
According to Trip.com's data, the lowest price is around AU$ 399.
How long is the flights from St. Louis (STL) to Denver (DEN)?
It takes about 3 hours 20 minutes to fly from St. Louis (STL) to Denver (DEN).
What are the most popular airlines that fly from St. Louis (STL) to Denver (DEN)?
Airlines with flights from St. Louis (STL) to Denver (DEN): United Airlines, Frontier Airlines, Volaris and Southwest Airlines.
What's the most popular airline for direct flights from St. Louis (STL) to Denver (DEN)?
Frontier Airlines operates 1 direct flights from St. Louis (STL) to Denver (DEN).
How many airports in Denver (DEN)?
There are 4 airport(s) in Denver (DEN): Denver Arapahoe County Airport, Denver Buckley Angb, Rocky Mountain Metropolitan Airport and Denver International Airport.

How to find a cheap flight from St. Louis to Denver

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Denver. Book your flights at the right time and save more.

Book Early

Once prices are gone, they're gone. Lock in deals while you can!

Compare Flight Prices

Compare prices on travel agency and airline websites.

Look Out for Deals

Check airline and travel agency websites for latest flight deals

Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

Flying during the week, early in the morning, or late at night can help save money.

Use the Trip.com App

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Flight Information from St. Louis to Denver

Cheapest direct flight price	AU$ 29
Cheapest return ticket price	AU$ 71
Off-season for travel	February
Peak season for travel	October
Flight distance	1,253.6km
Average flight time	3 hours 20 minutes
Popular airline	Delta Air Lines