Cheap Flights from St. Louis (STL) to Denver (DEN)

View AU$256 flight on Mon, 11 Aug. 2025Opens in a new window

Popular airlines from Lambert-St. Louis International Airport (STL) to Denver International Airport (DEN)

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Cheap Flights from St. Louis (STL) to Denver (DEN)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Find the cheapest month to fly from St. Louis (STL) to Denver (DEN)

October is typically the cheapest month to fly

From AU$74 - AU$206 per traveller.

Graph displaying average flight prices per month

Flight from St. Louis to Denver route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Denver Intl.
Distance
1228 km
Average flight time
1 hour 19 mins

Your quick guide to flights from St. Louis to Denver

Pick up great flights from St. Louis to Denver

With Expedia, you have your pick of 15 flights a day with 13 airlines covering flights from St. Louis to Denver. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from St. Louis to Denver that take around 2 hours.

Find cheap flights from St. Louis to Denver

From the great flight deals with prices currently ranging from to , you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from St. Louis to Denver around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Denver is normally in .

Reasons to book your flight from St. Louis to Denver with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from St. Louis to Denver across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Denver right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Frequently asked questions

How much is a flight from St. Louis Lambert International Airport to DIA airport?
Pack your bags, because round-trip flights from Lambert Field to DIA airport start from . That's based on fares advertised within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from St. Louis Lambert International Airport to Denver Intl. Airport (DEN)?
Every air carrier has its own terms and conditions. If you do decide to cancel, follow the simple instructions on our Customer Service Portal.
How do I find cheap flights from Lambert Field to DIA airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for St. Louis Lambert International Airport to DIA airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Lambert Field to Denver Intl. Airport (DEN)?
That new movie you've been eager to see will have to wait — the flight distance between Lambert Field and Denver Airport is only 1 250 kilometres. The captain will be instructing you to put your seat upright for landing before you know it.
Which airlines fly direct from STL to DEN?
Southwest Airlines (WN) is one of the top choices for many travellers flying between Lambert Field and DEN. Select from the 178 flights it operates on this route each month. You could also take a look at fares with United Airlines (UA). This carrier operates 121 flights a month between St. Louis and Denver.
Are St. Louis Lambert International Airport to Denver Airport flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from St. Louis Lambert International Airport to Denver Airport can be hit-or-miss. It is possible to find a bargain, but then again, you could miss out entirely! If you'd prefer to play it safe and start your trip planning early on, Expedia compares flight deals up to 12 months in advance. Just keep in mind that not all airlines release their prices so far in advance. Our top tip? Check back often as prices are updated frequently.

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