Find cheap one-way flights from St. Louis to Denver starting at US$19.

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

Round-trip
One way

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

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

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

Cheapest flights

From price

9 16
16 23
23 30
Apr

30 6
6 13
13 20
20 27
May

27 4
4 11
11 18
18 25
Jun

25 1

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

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

Airlines adjust prices for flights from St. Louis to Denver 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 St. Louis (STL) to Denver (DEN) cost?

According to Trip.com's data, the lowest price is around $368.
How long does it take to fly from St. Louis (STL) to Denver (DEN) and what is the distance?

It takes around 6 hours 19 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, Southwest Airlines and Volaris.

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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St. Louis to Denver Flight Information

Cheapest nonstop flight price	$19
Cheapest round-trip ticket price	$57
Off-season for travel	March
Peak season for travel	June
Flight distance	1,253.6 km
Average flight time	6 hours 19 minutes
Popular airline	Delta Air Lines