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

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

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
30.2 - 73.4 °F
DEN
Precipitation
0.5 - 2.3 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 Lambert-St Louis to Denver Intl

One-way from

$76

One-way flight from Lambert-St Louis to Denver Intl

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
When is the cheapest time to fly from St. Louis to Denver (STL - DEN)?

It’s optimal to fly from St. Louis to Denver in the evening. By choosing this option you can save up to 41% on the cost of your flight, compared to a flight in the afternoon.

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

Find a great deal and save up to 14% by booking at least 61 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 $142.

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

September can be a great time to fly to Denver from St. Louis with a flight ticket averaging about $160. Cheapflights users have found deals in the month of September for as cheap as $82. The most expensive prices can be found in the month of December.

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

Saturday flights are generally found to be more expensive for flights 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.

Cheap flights from St. Louis to Denver in October, November 2021

The best prices found for STL to DEN flights for October, November
13 Nov - 16 Nov
$61pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
13 Nov - 16 Nov
$64pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
11 Nov - 13 Nov
$68pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

Lambert-St Louis to Denver 2021 flight deals

Cheap flights to Denver from St. Louis found for this year
13 Nov - 16 Nov
$61pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
10 Dec - 13 Dec
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
3 Dec - 6 Dec
$64pp
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
13 Nov - 16 Nov
$61pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
10 Dec - 13 Dec
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
3 Dec - 6 Dec
$64pp
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
6 Nov - 10 Nov
$92pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
3 Nov - 9 Nov
$93pp
STL
Lambert-St Louis
Frontier
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
4 Nov - 10 Nov
$94pp
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 Intl from St. Louis

The cheapest one-way flights from St. Louis to Denver
1:30 am - 5:19 am
Delta
1 Stop
4h 49m
STL - DEN
Delta
$76
Delta
12:25 am - 2:08 am
United Airlines
Nonstop
2h 43m
STL - DEN
United Airlines
$79
United
2:45 pm - 4:17 pm
Frontier
Nonstop
2h 32m
STL - DEN
Frontier
$84
JustFly

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

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 14 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 20m.

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.

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 $61, but on average you can expect to pay $82.

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.

What days are nonstop flights available from St. Louis to Denver?

Days when nonstop flights are available for this flight are: Thursday, Friday, Saturday.

How popular is this St. Louis to Denver flight route?

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

How many flights depart from St. Louis to Denver on average per day?

14 flight departures from St. Louis to Denver per day on average.
Early Morning (Midnight to 6am) - 7% of flight departures
Morning (6am - Noon) - 57% of flight departures
Afternoon (Noon - 6pm) - 14% of flight departures
Evening (6pm - Midnight) - 21% of flight departures

How long is the flight from St. Louis to Denver?

Departing from St. Louis to Denver will take you 2h 30m. Airlines will cover a distance of 772 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from St. Louis to Denver round-trip?

Frontier, at $61, was found to be the cheapest airline from St. Louis to Denver. An alternate airline flying to your destination would be Spirit Airlines. Users have found that Frontier is 61% cheaper than the other options available to this destination.

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

One-way options have recently been found by users for as low as $31 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $50 and United Airlines from $59 one-way.

What are the most reliable airlines from St. Louis to Denver?

No one likes to see their flight delayed. When booking a flight from St. Louis to Denver consider choosing Frontier (86%), SkyWest Airlines (86%) or Air Canada (85%) as they are the most reliable in getting you off to your destination on time.

What are the cheapest flights from St. Louis to Denver?

Looking for the cheapest flight from St. Louis to Denver? While on average our users pay $412, our data indicates the cheapest price to be $38. The most popular route (Lambert-St Louis - Denver Intl), is priced around $68.

What are the most popular airlines that fly from St. Louis to Denver?

When booking a flight from St. Louis to Denver, you may want to consider flying on Major Airline, American Airlines or Delta as they are the most popular for this route.

COVID Restrictions

View COVID Travel Restrictions for Denver, CO

Do I need a COVID test to fly to Denver from St. Louis?

Information is based on travel restrictions for travel to Denver Intl within the United States

Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter Denver Intl.

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Denver Intl.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Denver Intl.

Do I need a test to fly back to St. Louis from Denver?

Returning to Lambert-St Louis from Denver Intl

COVID-19 testing requirements
Visitors from Denver Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from Denver Intl are not required to quarantine after entering Lambert-St Louis.

Hide COVID Travel Restrictions for Denver, CO

Alternative routes for St. Louis to Denver

See prices for flight routes from nearby airports that may be better suited for you.

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 from STL to DEN
2h 19m
Average temperature for October in Denver
66.2 °F
Avg rainfall for October in Denver
0.9 ″

Airports servicing St. Louis

Airports servicing Denver

Top 5 airlines flying from Lambert-St Louis to Denver Intl

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%
Southwest
$69 $285 No cancel fee 63%
Delta
$77 $176 No cancel fee N/A
United Airlines
$97 $244 No cancel fee 69%

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 55% of STL to DEN departures
Afternoon Noon to 6 PM 31% of STL to DEN departures
Early morning Midnight to 6 AM 10% of STL to DEN departures
Evening 6 PM to midnight 4% 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
4 daily flights
Monday
18 daily flights
Tuesday
18 daily flights
Wednesday
18 daily flights
Thursday
18 daily flights
Friday
17 daily flights
Saturday
8 daily flights
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