$34 Cheap Flights from St. Louis to Denver

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly from Lambert-St. Louis Intl. to Denver Intl.

Amazing STL to DEN Flight Deals

The cheapest flights to Denver Intl. found within the past 7 days were $68 round trip and $34 one way. Prices and availability subject to change. Additional terms may apply.

Flight Schedule for STL to DEN

CarrierFlightDepart STLArrive DENWed
11/30
Thu
12/1
Fri
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Sat
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Mon
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Tue
12/6
Stops
UA154806:10 am11:51 amCheck FareCheck FareCheck FareCheck Fare
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1 Stops
UA537107:15 am08:50 amCheck Fare
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F969900:58 pm02:27 pmCheck FareCheck FareCheck Fare
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UA176201:27 pm02:51 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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UA522104:25 pm05:54 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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UA156107:15 am08:43 am
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F970110:19 pm11:52 pm
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Best Denver Intl. Flight and Hotel Packages

Denver Intl. flight + hotel packages - economy flights

Courtyard by Marriott Denver North/Westminster
DoubleTree by Hilton Denver Central Park
DoubleTree by Hilton Hotel Denver
Hilton Denver Inverness
Staybridge Suites Denver Downtown, an IHG Hotel
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Frequently asked questions

Can I catch a flight from STL to Denver Intl. Airport (DEN) right now?
It’s always wise to find out about any travel advice reports and quarantine requirements in effect in your destination. Make sure you check out the Covid-19 Travel Advisor for up-to-date info on catching a flight to Denver Intl. Airport (DEN).
Are there direct flights from Lambert-St. Louis Intl. Airport (STL) to Denver Airport?
If you’re hoping to travel from Lambert Field to DEN as speedily as possible, you’ll be pleased to know multiple airlines operate direct flights. Select your favorite seat with Southwest Airlines or United Airlines.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Denver Airport, please visit our Customer Service Portal.
How long is the flight from STL to DEN?
On average, flying from Lambert-St. Louis Intl. Airport (STL) to DIA airport takes just 2 hours and 22 minutes. Use the short flight to close your eyes or listen to a podcast before the next step of your journey begins.
What is the flight distance from STL to DEN?
The flight distance from Lambert-St. Louis Intl. Airport (STL) to Denver Intl. Airport (DEN) is a short 770 mi. You’ll be filing off the plane at your destination before you can say “bon voyage.”
What airlines fly from Lambert Field to DIA airport?
If you’re planning a trip to Denver from St. Louis, you’ll find a few airlines that offer direct flights. One of the most reputable carriers is Southwest Airlines (WN), which has 160 flights every month. Don’t forget to also look up the deals available through United Airlines (UA). Another leading airline, it operates 121 flights every month on the St. Louis to Denver route. Compare the two to find your perfect fare.
What airlines have practices regarding COVID-19 in place and use social distancing?
From the moment you enter the departure terminal to when you leave the arrivals terminal, if you’re flying with United Airlines, Southwest Airlines or Frontier Airlines you can be sure that COVID-19 measures and social distancing rules have been adhered to. Many airlines have introduced capped capacity flights and keeping the middle seat empty.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

 

Traveling From Lambert-St. Louis Intl.
Traveling To Denver Intl.
Shortest Flight Time 2 hours 24 mins
Earliest Departure Time 6:00AM CST
Latest Departure Time 10:05PM CST
Lowest Flight Price $68

Route Info

Flight path for flights from Lambert-St. Louis International Airport to Denver International Airport

Distance:
772.00 miles

Airlines & Aircraft Used on STL to DEN Flight Routes

Airline Carrier
Aircraft
American Airlines
Airbus A340-300
American Airlines
Boeing 737-800 pax
United Airlines
Boeing 737-300 pax
United Airlines
Boeing 737-800 (winglets) pax
United Airlines
Boeing 777-200 pax

Discover our best flights from St. Louis STL to Denver DEN. 

With 20 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 

 

Find our best return flights from St. Louis STL to Denver DEN at the right price  

Airfares to Denver DEN from St. Louis STL currently cost between $68 and $128. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way flights from St. Louis STL to Denver DEN 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from St. Louis STL to Denver DEN on Travelocity starting at $34. Prices and availability subject to change. Additional terms may apply. 

 

Get to Denver DEN from St. Louis STL quicker with direct flights. 

Get to Denver faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to DEN from STL to take around 2 hour(s) 24 min(s).  

 

Find our cheapest airfares for flights from St. Louis STL to Denver DEN

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to DEN from STL. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  

 

Get our best airfare deals for your flight from St. Louis STL to Denver DEN today 

If you’re flexible about when you travel, January is usually the cheapest month to fly from St. Louis STL to Denver DEN. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 

 

Book flexible airline tickets for flights to Denver DEN from St. Louis STL 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to DEN from STL have this option.  

 

Travel with confidence when you book flights to Denver DEN from St. Louis STL with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.