What is the cheapest airline that flies from Lambert-St Louis to Denver Intl?

United Airlines, Delta, and Southwest are the most popular carriers operating from Lambert-St Louis to Denver Intl

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

73 flights are operational weekly from St. Louis to Denver as of November 2026. The most popular departure day for this route is Fri, with 19% of flights per week taking off on this day.

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

As of November 2026, there are 10 flights per day flying from St. Louis to Denver. The most common time of day flights depart is 8:00, with 49% of flights taking off in the afternoon.

When did momondo last update prices for flights from Lambert-St Louis Airport to Denver Intl Airport?

Prices for flights from Lambert-St Louis Airport to Denver Intl Airport are updated daily.

How old do you have to be to fly from Lambert-St Louis Airport to Denver Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Denver Intl Airport.

What documentation or ID do you need to fly to Denver Intl Airport?

The travel and health documents required for your trip to Denver Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Denver Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

R1 464 Cheap Flights from St. Louis to Denver in 2026/27

Find the cheapest flights from St. Louis to Denver

Return

One-way

Last minute

Direct

Cheap return flights

Enter your travel dates to find the best prices.

14:50 - 16:21STL Lambert-St Louis-DEN Denver Intl

2h 31mdirect

17:49 - 20:57DEN Denver Intl-STL Lambert-St Louis

2h 08mdirect

R2 911United Airlines

Thu, Dec 3 - Thu, Dec 10

13:20 - 19:20STL Lambert-St Louis-DEN Denver Intl

7h 00m1 stop Las Vegas Harry Reid Intl

17:25 - 20:25DEN Denver Intl-STL Lambert-St Louis

2h 00mdirect

R3 075Southwest

Sat, Dec 5 - Sat, Dec 12

17:16 - 23:15STL Lambert-St Louis-DEN Denver Intl

6h 59m1 stop Minneapolis St Paul

15:50 - 23:28DEN Denver Intl-STL Lambert-St Louis

6h 38m1 stop Minneapolis St Paul

R3 240Delta

Wed, Dec 23 - Tue, Dec 29

8:55 - 10:20STL Lambert-St Louis-DEN Denver Intl

2h 25mdirect

6:45 - 9:50DEN Denver Intl-STL Lambert-St Louis

2h 05mdirect

R3 272Southwest

Sat, Dec 5 - Sat, Dec 12

14:50 - 16:21STL Lambert-St Louis-DEN Denver Intl

2h 31mdirect

15:50 - 22:59DEN Denver Intl-STL Lambert-St Louis

6h 09m1 stop Chicago O'Hare Intl

R3 338United Airlines

Thu, Dec 3 - Thu, Dec 10

17:25 - 18:50STL Lambert-St Louis-DEN Denver Intl

2h 25mdirect

14:50 - 19:05DEN Denver Intl-STL Lambert-St Louis

3h 15m1 stop Omaha Eppley Airfield

R3 371Southwest

Sat, Dec 12 - Sat, Dec 19

8:40 - 10:11STL Lambert-St Louis-DEN Denver Intl

2h 31mdirect

6:00 - 12:24DEN Denver Intl-STL Lambert-St Louis

5h 24m1 stop Chicago O'Hare Intl

R3 437United Airlines

Sat, Dec 5 - Sat, Dec 12

9:35 - 15:15STL Lambert-St Louis-DEN Denver Intl

6h 40m1 stop Las Vegas Harry Reid Intl

14:50 - 19:05DEN Denver Intl-STL Lambert-St Louis

3h 15m1 stop Omaha Eppley Airfield

R3 519Southwest

Wed, Dec 16 - Sat, Dec 19

12:36 - 20:20STL Lambert-St Louis-DEN Denver Intl

8h 44m1 stop Atlanta Hartsfield-Jackson

14:31 - 0:05DEN Denver Intl-STL Lambert-St Louis

8h 34m1 stop Atlanta Hartsfield-Jackson

R3 601Delta

Sat, Dec 12 - Tue, Dec 15

16:15 - 20:55STL Lambert-St Louis-DEN Denver Intl

5h 40m1 stop Dallas Love Field

15:40 - 18:35DEN Denver Intl-STL Lambert-St Louis

1h 55mdirect

R3 667Southwest

Tue, Dec 1 - Wed, Dec 2

Cheap last-minute flights

Enter your travel dates to find the best prices.

16:39 - 18:10STL Lambert-St Louis-DEN Denver Intl

2h 31mdirect

17:52 - 20:59DEN Denver Intl-STL Lambert-St Louis

2h 07mdirect

R11 215United Airlines

Mon, Nov 16 - Mon, Nov 23

8:30 - 12:45STL Lambert-St Louis-DEN Denver Intl

5h 15m1 stop Chicago O'Hare Intl

13:55 - 16:57DEN Denver Intl-STL Lambert-St Louis

2h 02mdirect

R11 379United Airlines

Sat, Nov 14 - Fri, Nov 20

8:30 - 12:45STL Lambert-St Louis-DEN Denver Intl

5h 15m1 stop Chicago O'Hare Intl

13:55 - 16:57DEN Denver Intl-STL Lambert-St Louis

2h 02mdirect

R11 445United Airlines

Sat, Nov 14 - Fri, Nov 20

16:39 - 18:10STL Lambert-St Louis-DEN Denver Intl

2h 31mdirect

13:55 - 16:57DEN Denver Intl-STL Lambert-St Louis

2h 02mdirect

R12 399United Airlines

Sat, Nov 14 - Fri, Nov 20

8:50 - 10:21STL Lambert-St Louis-DEN Denver Intl

2h 31mdirect

13:55 - 16:56DEN Denver Intl-STL Lambert-St Louis

2h 01mdirect

R12 448United Airlines

Thu, Nov 12 - Sun, Nov 15

8:30 - 12:45STL Lambert-St Louis-DEN Denver Intl

5h 15m1 stop Chicago O'Hare Intl

13:55 - 16:57DEN Denver Intl-STL Lambert-St Louis

2h 02mdirect

R12 563United Airlines

Sat, Nov 14 - Fri, Nov 20

8:30 - 12:45STL Lambert-St Louis-DEN Denver Intl

5h 15m1 stop Chicago O'Hare Intl

13:55 - 16:56DEN Denver Intl-STL Lambert-St Louis

2h 01mdirect

R12 613United Airlines

Thu, Nov 12 - Sun, Nov 15

18:30 - 19:55STL Lambert-St Louis-DEN Denver Intl

2h 25mdirect

12:25 - 15:20DEN Denver Intl-STL Lambert-St Louis

1h 55mdirect

R14 833Southwest

Fri, Nov 13 - Tue, Nov 17

8:30 - 12:45STL Lambert-St Louis-DEN Denver Intl

5h 15m1 stop Chicago O'Hare Intl

13:55 - 16:57DEN Denver Intl-STL Lambert-St Louis

2h 02mdirect

R14 898United Airlines

Sat, Nov 14 - Fri, Nov 20

8:30 - 12:45STL Lambert-St Louis-DEN Denver Intl

5h 15m1 stop Chicago O'Hare Intl

13:55 - 16:56DEN Denver Intl-STL Lambert-St Louis

2h 01mdirect

R14 997United Airlines

Thu, Nov 12 - Sun, Nov 15

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

United Airlines flights from St. Louis to Denver

Our best United Airlines deals on St. Louis to Denver flight tickets

United Airlines

Dec 3

STL14:50Lambert-St Louis

2h 31m

DEN16:21Denver Intl

Dec 10

DEN17:49Denver Intl

2h 08m

STL20:57Lambert-St Louis

R2 911

United Airlines

Dec 3

STL14:50Lambert-St Louis

2h 31m

DEN16:21Denver Intl

Dec 10

DEN15:50Denver Intl

6h 09m

1 stop

STL22:59Lambert-St Louis

R3 338

United Airlines

Dec 5

STL8:40Lambert-St Louis

2h 31m

DEN10:11Denver Intl

Dec 12

DEN6:00Denver Intl

5h 24m

1 stop

STL12:24Lambert-St Louis

R3 437

Alaska Airlines flights from St. Louis to Denver

Our best Alaska Airlines deals on St. Louis to Denver flight tickets

Alaska Airlines

Nov 23

STL6:00Lambert-St Louis

15h 57m

1 stop

DEN20:57Denver Intl

Nov 27

DEN7:29Denver Intl

15h 30m

2 stops

STL23:59Lambert-St Louis

R16 674

Alaska Airlines

Nov 19

STL15:23Lambert-St Louis

27h 30m

1 stop

DEN17:53Denver Intl

Nov 26

DEN7:29Denver Intl

29h 53m

2 stops

STL14:22Lambert-St Louis

R17 661

Alaska Airlines

Nov 19

STL6:00Lambert-St Louis

16h 26m

2 stops

DEN21:26Denver Intl

Nov 23

DEN6:01Denver Intl

16h 58m

1 stop

STL23:59Lambert-St Louis

R17 760

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Thu 3/12

14:50-16:21

Nonstop2h 31m

Denver Intl

Thu 10/12

17:49-20:57

Nonstop2h 08m

R2 911

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Sat 5/12

13:20-19:20

1 stop7h 00m

Denver Intl

Sat 12/12

17:25-20:25

Nonstop2h 00m

R3 075

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Wed 23/12

17:16-23:15

1 stop6h 59m

Denver Intl

Tue 29/12

15:50-23:28

1 stop6h 38m

R3 240

Fastest return journey

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Sat 5/12

8:55-10:20

Nonstop2h 25m

Denver Intl

Sat 12/12

6:45-9:50

Nonstop2h 05m

R3 272

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Thu 3/12

14:50-16:21

Nonstop2h 31m

Denver Intl

Thu 10/12

15:50-22:59

1 stop6h 09m

R3 338

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Sat 12/12

17:25-18:50

Nonstop2h 25m

Denver Intl

Sat 19/12

14:50-19:05

1 stop3h 15m

R3 371

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Sat 5/12

8:40-10:11

Nonstop2h 31m

Denver Intl

Sat 12/12

6:00-12:24

1 stop5h 24m

R3 437

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Wed 16/12

9:35-15:15

1 stop6h 40m

Denver Intl

Sat 19/12

14:50-19:05

1 stop3h 15m

R3 519

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Sat 12/12

12:36-20:20

1 stop8h 44m

Denver Intl

Tue 15/12

14:31-0:05

1 stop8h 34m

R3 601

St. LouisDenver

STL Lambert-St Louis - DEN Denver Intl

STLDEN

Lambert-St Louis

Tue 1/12

16:15-20:55

1 stop5h 40m

Denver Intl

Wed 2/12

15:40-18:35

Nonstop1h 55m

R3 667

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

What is the typical price of a round-trip flight between St. Louis and Denver?

Prices are currently typical for flights on this route.

Typical prices usually range from R2 911 to R6 068.
The lowest price recently found on this route was R2 911.

What is the cheapest month to fly to Denver?

The cheapest month to fly to Denver from St. Louis is in January. Flight prices, which tend to average around R3 519, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in January, then you should wait until February to fly from St. Louis, when ticket prices are also cheap, with an average price of R3 947.

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

You are more likely to see cheaper flights to Denver from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around R4 615 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from St. Louis for as low as R3 980 on momondo.

How have St. Louis to Denver flight prices changed over time?

As of November 2026, prices for St. Louis to Denver flights are approximately 17% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Denver

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Denver according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap St. Louis to Denver (STL to DEN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Denver

Best price found	R1 464
Direct flights	Every day
Airports in Denver	1 airport

The best one-way flight to Denver from St. Louis in the past 72 hours is R1 464. The best return flight deal from St. Louis to Denver found on momondo in the last 72 hours is R2 911.

Direct flights go from St. Louis to Denver every day.

There is 1 airport in Denver. From St. Louis there are direct flights to Denver Intl (DEN).

Search flight deals

Frequently asked questions about flying from St. Louis to Denver

How far is Lambert-St Louis to Denver Intl by plane?
A flight from Lambert-St Louis to Denver Intl will travel around 1278,1 km.
When did momondo last update prices for flights from Lambert-St Louis Airport to Denver Intl Airport?
Prices for flights from Lambert-St Louis Airport to Denver Intl Airport are updated daily.
How old do you have to be to fly from Lambert-St Louis Airport to Denver Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Denver Intl Airport.
What documentation or ID do you need to fly to Denver Intl Airport?
The travel and health documents required for your trip to Denver Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Denver Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from St. Louis to Denver?
Based on momondo bookings for flights between St. Louis and Denver, the leading plane model is Boeing 737 MAX 8, making up 18,38% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 16,96%, Boeing 737-800 with 11,53%, and Airbus A320-100/200 with 9,60%.

Black Hawk

Manitou Springs

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Denver?

Finding the right flight to Denver from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Denver quick and easy, saving you time and money.

Can I find flights from St. Louis to Denver with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Denver from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Denver?

momondo provides multiple filters to help you find the best flight to Denver from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to Denver right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Denver flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.