$19 Cheap Flights from Denver to St. Louis (DEN to STL)

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Cheap flight deals from Denver to St. Louis Starting at $19

Whether you’re going for a one-way or round-trip to St. Louis, we’ve got you covered! Check out these different flight options from Denver below.

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?

Explore the best time to buy affordable tickets to St. Louis with our price trend chart, which predicts how flight prices will change in the coming weeks from previous data.

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

Which airline provides the cheapest flights from Denver to St. Louis? Discover the option that best suits your travel needs before embarking on your journey.

Frontier Airlines

From $19

American Airlines

From $68

Delta Air Lines

From $78

United Airlines

From $83

Southwest Airlines

From $128

Alaska Airlines

From $165

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? There are a few alternative ways to get to St. Louis from Denver which could help you save money and time.

Cheapest
DEN
05:05
2h 8m
Nonstop
STL
08:13
Denver International Airport - St.Louis Lambert International Airport
Sat, Dec 7Frontier Airlines
$19
DEN
05:05
2h 8m
Nonstop
STL
08:13
Denver International Airport - St.Louis Lambert International Airport
Sat, Dec 7Frontier Airlines
$19
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 $199.
How long does it take to fly from Denver (DEN) to St. Louis (STL) and what is the distance?
It takes around 2 hours 41 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 20 km. 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.

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

If you don’t know some of the key things to look out for when buying flight tickets, prices can often end up sky high or, worse, sold out! We’ve carefully compiled our six most important steps to help ensure you’re getting the best deals when planning your next journey.

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

Save up to £10 per person when booking your flights on Trip.com

Flight Info | Denver to St. Louis

Cheapest nonstop flight price	$18
Cheapest round-trip ticket price	$45
Off-season for travel	October
Peak season for travel	January
Flight distance	1,253.6 km
Average flight time	2 hours 41 minutes
Popular airline	American Airlines