Cheap flights from St. Louis to Denver

Round-trip
Economy
St. Louis (STL)
Denver (DEN)
Fri 11/20
Fri 11/27
Any month
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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 $57 The best flight deal from St. Louis to Denver found on momondo in the last 72 hours is $57
Fastest flight time 2h 27m The fastest flight from St. Louis to Denver takes 2h 27m.
Direct flights Tu and Su Direct flights go from St. Louis to Denver on Tuesday and Sunday. Airlines offering direct flights are: United Airlines, Air Canada and Frontier.
Airports in Denver 2 airports There 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 to Denver?
April
The cheapest time of year to fly to Denver from St. Louis is April. Most expensive is December
What is the cheapest day to fly to Denver?
Wednesday
The cheapest day of the week is typically Wednesday. The most expensive is typically Sunday
When is the cheapest time to fly to Denver?
in the evening
St. Louis to Denver flights are approximately 37% more expensive at noon than in the evening
What is the cheapest airline that flies to Denver?
Frontier
Frontier, American Airlines, and Delta are the most popular carriers operating from St. Louis to Denver
What is the cheapest 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
When is the cheapest time to book a flight to Denver?
42 days before
The cheapest time to buy a flight from St. Louis to Denver is approximately 42 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
Cheapest
Best
Quickest
Frontier
Nov 3
STL
Lambert-St Louis
2h 31m
DEN
Denver Intl
Nov 13
DEN
Denver Intl
1h 58m
STL
Lambert-St Louis
Multiple Airlines
Nov 2
STL
Lambert-St Louis
2h 27m
DEN
Denver Intl
Nov 12
DEN
Denver Intl
5h 28m
1 stop
STL
Lambert-St Louis
Frontier
Nov 2
STL
Lambert-St Louis
2h 27m
DEN
Denver Intl
Nov 13
DEN
Denver Intl
1h 58m
STL
Lambert-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 and United Airlines
Cheapest
Best
Quickest
Frontier
Nov 8
STL
Lambert-St Louis
2h 27m
DEN
Denver Intl
United Airlines
Nov 19
STL
Lambert-St Louis
2h 33m
DEN
Denver Intl
Delta
Nov 14
STL
Lambert-St Louis
5h 40m
1 stop
DEN
Denver Intl

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

Southwest and Delta have 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 49m
Cheapest price
$77
St. Louis to Colorado Springs Flights
Fastest flight time
4h 05m
Cheapest price
$188
Kansas City to Colorado Springs Flights
Fastest flight time
7h 19m
Cheapest price
$216
Joplin to Denver Flights
Fastest flight time
4h 21m
Cheapest price
$292
View more

Flights from St. Louis to:

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