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Cheap Flights from St Louis to Denver, CO, United States - STL to DEN

Popular flights from St Louis to Denver

We’ve got the inside scoop on finding the best time to fly for the best price. Not sure when to travel for your next vacation? Find details below on when-to-fly and when-to-buy.

Alaska Airlines
Departure Date Return Date Lowest Price
Aug 29, 2016 Aug 31, 2016 $301
American Airlines
Departure Date Return Date Lowest Price
Aug 6, 2016 Aug 13, 2016 $194
Aug 8, 2016 Aug 10, 2016 $194
Aug 15, 2016 Aug 20, 2016 $194
Aug 17, 2016 Aug 24, 2016 $194
Aug 20, 2016 Aug 24, 2016 $194
Frontier Airlines
Departure Date Return Date Lowest Price
May 9, 2016 May 11, 2016 $108
United Airlines
Departure Date Return Date Lowest Price
Aug 23, 2016 Aug 30, 2016 $231

How Much Does it Cost to Fly from St Louis to Denver (STL to DEN)?

We have collected flight cost data from across the web for travel from St Louis to Denver, and have found the average flight price for this trip to be $147.

When Can I Buy the Cheapest Flight from St Louis to Denver (STL to DEN)?

Airlines can adjust prices for plane tickets from St Louis to Denver based on the day and time that you decide to book your flight. We have collected data from all airlines, and have discovered that the best days to book flights are Tuesdays, Wednesdays, and Saturdays. Read our article to find more information about the best time to buy airline tickets.

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

The chart below shows up-to-date information regarding how far in advance a flight from St Louis to Denver should be booked.

Non Stop versus 1-Stop
Advanced PurchaseNon StopOne Stop
< 7 days $253 $294
7-14 days $108 $269
14-21 days $158 $229
21-30 days $283 $332
30-60 days $154 $209
60-90 days $134 $214
90+ days $118 $194

Cheapest Day To Fly from St Louis to Denver

The chart below shows up-to-date information regarding the cheapest days to fly from St Louis to Denver.

Monday Tuesday Wednesday Thursday Friday Saturday Sunday
$108 $134 $171 $154 $154 $154 $154

Lowest Fares Chart By Month from St Louis to Denver

The chart below shows the lowest fare by month when flying from St Louis to Denver.

Month Origin Destination Carrier Depart Date Return Date Stops Price
May St Louis Denver Frontier 5/9/16 5/11/16 0 $108
June St Louis Denver Frontier 6/16/16 6/21/16 0 $154
July St Louis Denver Frontier 7/26/16 8/2/16 0 $134
August St Louis Denver Frontier 8/20/16 8/24/16 0 $118
September St Louis Denver Frontier 9/10/16 9/17/16 0 $118
October St Louis Denver Frontier 10/1/16 10/4/16 0 $118
November St Louis Denver American 11/9/16 11/13/16 1 $194
December St Louis Denver American 12/8/16 12/15/16 1 $194

Cheapest Weekend Non-Stop Flights for the Next 30 Days from St Louis to Denver

If you're ready to take a trip in the next 30 days and want to fly on the weekend, you might be wondering which weekend is the cheapest to fly. The chart below shows up-to-date data regarding weekend flight prices from St Louis to Denver.

Next 30 Days

SunMonTueWedThuFriSat
1 2 3 4 5 6 7
$303
8 9 10 11 12 13 14
$303
15 16 17 18 19 20 21
$158
22 23 24 25 26 27 28
$158 $283
29 30 31 1 2 3 4
$283 $183
5 6 7 8 9 10 11
$183

Non-Stop vs Connecting Flights from St Louis to Denver (STL to DEN)

Your St Louis to Denver flight can be significantly cheaper by choosing a multi-stop airline ticket. Although these connecting flights sacrifice some convenience, on average, travelers save 20%-60% when they choose to fly multi-stop versus a direct flight.

The average price for connecting flights from St Louis to Denver is $291.

The average price for non-stop flights from St Louis to Denver is $206.

The chart below shows up to date information regarding non-stop flights from St Louis to Denver.

Nonstop Flight Details from St Louis to Denver
CarrierMonTueWedThuFriSatSunEarliest FlightLatest Flight
Frontier 1 1 1 1 1 1 1 17:05 17:05
United 5 4 4 5 5 3 2 05:46 19:38

Round Trip vs One Way Flights from St Louis to Denver (STL to DEN)

We have found that there is often no price difference between buying a round trip flight versus a one way flight. Increased flexibility is the main benefit when it comes to buying a one way flight from St Louis to Denver. However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison.

The average price for one way flights from St Louis to Denver is $128.

The average price for round trip flights from St Louis to Denver is $250.

More Cheap Flights

FlightsAirlineLowest Price
Bloomington - Normal to Denver American $350
Springfield to Denver American, United $449
Moline to Denver American, Alaska, United $428
Peoria to Denver American, United $272
Evansville to Denver American, United $409
Champaign to Denver American $311
Springfield to Denver American, United $402
St Louis to Colorado Springs American, Alaska, Frontier, United $300
St Louis to Dallas - Ft Worth American, Alaska, United $203
St Louis to Chicago American, Alaska, United $213
St Louis to Las Vegas American, Alaska, Frontier, United $123
St Louis to Phoenix American, Alaska, Frontier, United $261
St Louis to Los Angeles American, Alaska, Frontier, United $261
St Louis to Atlanta American, Alaska, Frontier, United $88
Springfield to Colorado Springs American, United $504
St Louis to Aspen American, Alaska, United $542
St Louis to Hayden - Steamboat American, United $502
Moline to Colorado Springs American, United $448
St Louis to New York American, Alaska, United $253
Evansville to Colorado Springs American, United $414
Peoria to Colorado Springs American, United $451
St Louis to Salt Lake City American, Alaska, Frontier, United $236
St Louis to Vail American, Alaska, United $542
Bloomington - Normal to Colorado Springs American $494
Springfield to Colorado Springs American, United Check Dates
St Louis to Houston American, Alaska, United $278
St Louis to San Francisco American, Alaska, Frontier, United $261
Moline to Dallas - Ft Worth American, United $403
St Louis to Albuquerque American, Alaska, United $346
St Louis to Seattle American, Alaska, Frontier, United $264

Airlines Flying from St Louis to Denver (STL to DEN)

Below are the different airlines that fly from St Louis to Denver with the average price of their plane tickets. Just remember that different airlines offer different levels of comfort and service, so consider convenience when choosing your airline.

Below is the full flight schedule summary of the next 30 days for flights from St Louis to Denver.

St Louis to Denver
Airline Connections Mon Tue Wed Thu Fri Sat Sun
American PHX X X X X X X X
Alaska SEA X X X X X X X
Delta SLC X X X X X X X
Frontier - X X X X X X X
United - X X X X X X X
United ORD X X X X X X X
Southwest - X X X X X X X
Southwest MSP X X X X X X X

Airports for Your Route

These pages contain information about the major airports in St Louis and Denver, so you can feel comfortable knowing how to get around whether you are about to take off or you just landed.

St Louis to Denver Flight Questions

Below are some common questions that asked about this flight route:

Question: How long is a direct flight from St Louis to Denver?
Answer: The average St Louis to Denver flight time is 2 hours and 28 minutes.
Question: How many miles are there between St Louis and Denver?
Answer: The distance from St Louis to Denver is 767 miles.
Question: How common are direct flights from St Louis to Denver?
Answer: There are 34 direct flights from St Louis to Denver.
Question: What is the most popular airline for non-stop flights from St Louis to Denver?
Answer: United Airlines provides 79% of the non-stop flights between St Louis and Denver.
Question: What are the most popular connecting cities when flying from St Louis to Denver?
Answer: Minneapolis - St Paul, MN
St Louis (STL) To Denver, CO (DEN) Flights: Cheap Flights From St Louis To Denver | FareCompare.