Cheap flights from St. Louis to Denver

Round-trip
Economy
St. Louis (STL)
Denver (DEN)
Sat 6/5
Sat 6/12
Any month
Compare vs. momondo |

Flight information for St. Louis to Denver
(STL to DEN)

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Denver
Best Price Found$74The best flight deal from St. Louis to Denver found on momondo in the last 72 hours is $74
Fastest flight time2h 20mThe fastest flight from St. Louis to Denver takes 2h 20m
Direct flightsMo, Fr, Sa and SuDirect flights go from St. Louis to Denver on Monday, Friday, Saturday and Sunday. The only airline offering direct flights is Frontier.
Airports in Denver2 airportsThere are 2 airports near Denver: Denver Arapahoe Co (APA), Denver Intl (DEN)

How to get the cheapest flight ticket from St. Louis to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

September
The cheapest time of year to fly to Denver from St. Louis is September. Most expensive is December

What is the cheapest day to depart St. Louis for Denver?

Wednesday
The cheapest day of the week is typically Wednesday. The most expensive is typically Sunday

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

in the evening
St. Louis to Denver flights are approximately 41% more expensive in the afternoon than in the evening

What is the cheapest airline that flies to Denver from St. Louis?

Frontier
Frontier, American Airlines, and Delta are the most popular carriers operating from St. Louis to Denver

What is the cheapest St. Louis to Denver flight route?

Lambert-St Louis - Denver Intl
Fly from Lambert-St Louis to Denver Intl for the best St. Louis - Denver flight prices
STL
Lambert-St Louis
DEN
Denver Intl

How far in advance should you book St. Louis to Denver flights?

60 days before
The cheapest time to buy a flight from St. Louis to Denver is approximately 60 days to departure
60
Days before departure
0

Easily compare round-trip flights from St. Louis to Denver

Below you can see the best fares for your round-trip flight route over the next three months. All fares were found on momondo this week. Browse the quickest and cheapest flights from St. Louis to Denver by changing tabs
Multiple Airlines
May 20
STL6:50 pmLambert-St Louis
2h 29m
DEN9:19 pmDenver Intl
May 24
DEN2:42 pmDenver Intl
2h 03m
STL4:45 pmLambert-St Louis
Frontier
May 13
STL6:50 pmLambert-St Louis
2h 29m
DEN9:19 pmDenver Intl
May 16
DEN2:10 amDenver Intl
2h 06m
STL4:16 amLambert-St Louis
Frontier
May 13
STL6:50 pmLambert-St Louis
2h 29m
DEN9:19 pmDenver Intl
May 16
DEN2:10 amDenver Intl
2h 06m
STL4:16 amLambert-St Louis

Find the cheapest one-way flights from St. Louis to Denver

If you're looking for one-way flights from St. Louis to Denver, view some of our deals below provided by Frontier
Frontier
Jun 6
STL6:03 amLambert-St Louis
2h 21m
DEN8:24 amDenver Intl
Frontier
Jun 12
STL5:39 amLambert-St Louis
2h 24m
DEN8:03 amDenver Intl
Frontier
Jun 13
STL5:39 amLambert-St Louis
2h 24m
DEN8:03 amDenver Intl

Best airlines flying from St. Louis to Denver

Compare and see reviews for airlines that fly from St. Louis to Denver with momondo
AirlineRatingFree CancellationPrice
Frontier
PriceFrom $57
Free Cancellation
Rating
7.5
8.0

Boarding

7.1

Comfort

8.1

Crew

6.6

Entertainment

6.9

Food

Reviews

Cons: Everything is ok

1 / 10
American Airlines
PriceFrom $57
Free Cancellation
Rating
7.2
7.4

Boarding

7.1

Comfort

7.9

Crew

7.0

Entertainment

6.8

Food

Reviews

Pros: Yes made sure mask was in place

Cons: No

1 / 10
Southwest
PriceFrom $69
Free Cancellation
Rating
8.4
8.6

Boarding

8.5

Comfort

8.8

Crew

7.6

Entertainment

7.8

Food

Reviews

Pros: The plane was new and the seats were nice.

1 / 10
Delta
PriceFrom $77
Free Cancellation
Rating
8.1
8.2

Boarding

8.4

Comfort

8.2

Crew

7.8

Entertainment

8.0

Food

Reviews

Cons: Wouldn't let us on the flight when there was plenty of time to get there. Manager was arrogant and slow - didn't care. Poor policies at that airport.

1 / 10
United Airlines
PriceFrom $97
Free Cancellation
Rating
6.8
7.2

Boarding

6.6

Comfort

7.5

Crew

6.6

Entertainment

6.0

Food

Reviews

Pros: It was meh....

Cons: I got no notification that the flight was going to be 1 hour earlier

1 / 10

Which airlines flying from Lambert-St Louis to Denver Intl have COVID-19 safety policies in place?

Delta has implemented additional safety measures to accommodate travelers. Usage of HEPA filters, scheduled sanitation, enhanced cleaning of aircrafts, pre-flight testing, and mask policies are some of the implemented practices made by airlines to help keep you safe as you depart from Lambert-St Louis to Denver Intl. Keep in mind that policies will vary by airline.

Are airlines flying from Lambert-St Louis to Denver Intl offering flexible cancellation due to COVID-19?

Due to the global impact of COVID-19, some of our airline partners operating flights from Lambert-St Louis to Denver Intl, such as Frontier, United Airlines, and American Airlines may have put in place flexible cancellation policies. Use our site to search for all of the airlines offering this flexibility to you.


Alternative routes for St. Louis to Denver

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Kansas City to Denver Flights
Fastest flight time
1h 51m
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Joplin to Denver Flights
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2h 10m
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Kansas City to Colorado Springs Flights
Fastest flight time
3h 48m
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$213
St. Louis to Colorado Springs Flights
Fastest flight time
5h 00m
Cheapest price
$232
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