Cheap flights from St Louis to Denver (STL - DEN)

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The best prices from St Louis to Denver are usually found in September or October, booked 60 days in advance, depart on a Wednesday or Tuesday and return on a Saturday

Home North America USA Colorado Denver Cheap flights from St Louis to Denver

How to find the cheapest flight from
St Louis (STL) to Denver (DEN)

All the information you need to plan the best STL to DEN flight in 2021: compare St Louis to Denver flight prices with the expected peak season, weather and rainfall in Denver.
STL - DEN
Price
$127 - $218
DEN
Temperature
44.6 - 89.6 °F
DEN
Rainfall
0.5 - 2.7 inches

Popular in

December

High demand for flights, 26% potential price rise

Cheapest in

September

Best time to find cheap flights, 21% potential price drop

Round-trip from

$127

From St Louis to Denver

One-way from

$76

One-way flight from St Louis to Denver

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from St Louis to Denver?

Saturday flights are found to be more expensive to fly from St Louis to Denver. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Denver.

How far in advance should I book a flight from St Louis to Denver?

Find a great deal and save up to 12% by booking at least 14 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St Louis to Denver within the next two weeks, with the cheapest ticket starting at $88.

What is the cheapest month to fly from St Louis to Denver?

Our data shows that August tends to be the cheapest month to fly to Denver from St Louis. Users have commonly found prices around $98 for the month, but tickets can be as low as $36. Due to multiple factors, prepare for potentially higher prices in December.

When is the cheapest time to fly from St Louis to Denver (STL - DEN)?

One of the essential ways to save on airfare from St Louis to Denver is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 41% on airfare.

Cheap flights from St Louis to Denver in May, June 2021

The best prices found for STL to DEN flights for May, June
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

St Louis to Denver 2021 flight deals

Cheap flights to Denver from St Louis found for this year
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

Non-stop flights to Denver from St Louis

Save time with St Louis to Denver direct flight deals
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

Last minute flights from St Louis to Denver

Late deals on round-trip flights to Denver from St Louis, departing today and this week
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

One-way flights to Denver from St Louis

The cheapest one-way flights from St Louis to Denver
2:00 am - 5:53 am
American Airlines
1 Stop
4h 53m
STL - DEN
American Airlines
$76
7:00 am - 1:12 pm
Spirit Airlines
1 Stop
7h 12m
STL - DEN
Spirit Airlines
$87
Expedia
3:55 am - 9:24 am
Delta
1 Stop
6h 29m
STL - DEN
Delta
$89
Delta

Related info for your journey

Useful info, stats and facts about <span class="emphasized">St Louis</span> to <span class="emphasized">Denver</span> flights.

Flight FAQs

From St Louis to Denver

Are flight prices decreasing from St Louis to Denver due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both St Louis and Denver for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Which airlines flying from Lambert-St Louis to Denver Intl have flexible cancellations due to COVID-19?

Some of the carriers operating flights from Lambert-St Louis to Denver Intl that may be offering flexible cancellation policies are Frontier, United Airlines, and American Airlines. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.

What airports do I use to fly from St. Louis to Denver?

You will need to book a flight from Lambert-St Louis to Denver Intl if you want to fly from St. Louis to Denver. At least 6 different airlines have flights from Lambert-St Louis (STL) to Denver Intl (DEN) on a regular basis. There are 10 flights to Denver from the St. Louis airport per day. If you manage to book one that is nonstop, then you can expect the flight time from STL to DEN to be around 2h 17m.

Can I find flights from St Louis to Denver for under $100 on Cheapflights?

Yes, there are multiple flights from St Louis to Denver for under $100. The cheapest flight booked recently is on Frontier for just $62, but on average you can expect to pay $85.

Are there nonstop flights from St Louis to Denver for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from St Louis to Denver under $100. A good price for a nonstop flight from St Louis to Denver is less than $85.

Are there last-minute flights available from St Louis to Denver for under $100?

There are currently 20+ open flights from St Louis to Denver within the next 7 days for less than $100.

How popular is this flight route?

Flights from Lambert-St Louis to Denver Intl have been viewed 358 times in the past calendar month.

Does it rain more in St Louis or Denver?

When traveling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in St Louis is roughly greater than that of Denver. You can assume this to be the case over the next 18 days.

Is St Louis weather warmer or cooler than Denver?

Temperatures around the 90 °F's can be experienced in July. The weather in Denver is the same as in St Louis. Plan for potential changes in flight availability as peak weather approaches in this location.

How long is the flight from St Louis to Denver?

Departing from St Louis to Denver will take you 2h 21m. Most flights are nonstop.

What is the cheapest airline to fly from St Louis to Denver round-trip?

Frontier, at $62, was found to be the cheapest airline from St Louis to Denver.. You may be able to fly from St Louis to Denver for 61% less than the average price by searching for this airline.

What are the cheapest airlines to fly from St Louis to Denver one-way?

The cheapest airlines for a one-way flight from St Louis to Denver are Frontier ($33), American Airlines ($76), and Delta ($79).

Related searches

Flights to Denver from St Louis
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Alternative routes for St Louis to Denver

See prices for flight routes from nearby airports that may be better suited for you.
Joplin to Colorado Springs from $246 pp
Columbia to Colorado Springs from $259 pp
Springfield to Colorado Springs from $361 pp
Kansas City to Cortez from $568 pp

Destination information for Denver

Things to know before you go - useful duration and weather info for your trip from St Louis to Denver.
Flight duration
2h 18m
Average temperature for May in Denver
73.4 °F
Avg rainfall for May in Denver
1.9 ″

Airports servicing St. Louis

St Louis (STL)

Airports servicing Denver

Denver (DEN)

Top 5 airlines flying from St Louis to Denver

The chart below displays the airlines Cheapflights users traveling from St Louis to Denver choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier 		$57 $140 No cancel fee 62%
American Airlines 		$57 $159 No cancel fee 71%
Delta 		$77 $176 No cancel fee N/A
United Airlines 		$97 $244 No cancel fee 69%
Southwest 		$69 $285 No cancel fee 63%

Popular flight searches

Check out other popular destinations found by fellow travelers in 2021.

Hourly flight availability from St Louis to Denver

See what time of day planes typically take off from St Louis towards Denver.
Morning 6 AM to noon 48% of STL to DEN departures
Afternoon Noon to 6 PM 40% of STL to DEN departures
Early morning Midnight to 6 AM 7% of STL to DEN departures
Evening 6 PM to midnight 5% of STL to DEN departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from St Louis to Denver
See how many times per day planes take to the skies headed from St Louis to Denver.
Sunday
11 daily flights
Monday
12 daily flights
Tuesday
11 daily flights
Wednesday
11 daily flights
Thursday
12 daily flights
Friday
12 daily flights
Saturday
6 daily flights
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