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Cheap Flights from St Louis to Denver International

Compare St Louis to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

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Flight deals from St Louis to Denver International

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Denver International Airport? If you want to travel next month, return fares start from Rs27,138. Find the lowest prices on one-way and return tickets right here.
Denver.Rs13,523 per passenger.Departing Thu, 15 Oct.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Thu, 15 Oct, arriving in Denver International.Price includes taxes and charges.From Rs13,523, select.
Denver.Rs13,533 per passenger.Departing Mon, 14 Sep.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Mon, 14 Sep, arriving in Denver International.Price includes taxes and charges.From Rs13,533, select.
Denver.Rs13,561 per passenger.Departing Mon, 17 Aug.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Mon, 17 Aug, arriving in Denver International.Price includes taxes and charges.From Rs13,561, select.
Denver.Rs24,446 per passenger.Departing Tue, 10 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 10 Nov, arriving in Denver International.Price includes taxes and charges.From Rs24,446, select.
Denver.Rs25,786 per passenger.Departing Wed, 4 Nov.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Wed, 4 Nov, arriving in Denver International.Price includes taxes and charges.From Rs25,786, select.
Denver.Rs25,871 per passenger.Departing Mon, 7 Dec.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Mon, 7 Dec, arriving in Denver International.Price includes taxes and charges.From Rs25,871, select.
Denver.Rs28,007 per passenger.Departing Mon, 11 Jan.One-way flight with United.Outbound direct flight with United departs from St Louis on Mon, 11 Jan, arriving in Denver International.Price includes taxes and charges.From Rs28,007, select.
Denver.Rs52,605 per passenger.Departing Thu, 30 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 30 Jul, arriving in Denver International.Price includes taxes and charges.From Rs52,605, select.
Denver.Rs54,906 per passenger.Departing Thu, 15 Apr.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 15 Apr, arriving in Denver International.Price includes taxes and charges.From Rs54,906, select.
Denver.Rs55,380 per passenger.Departing Thu, 30 Jul.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Thu, 30 Jul, arriving in Denver International.Price includes taxes and charges.From Rs55,380, select.
Denver.Rs87,454 per passenger.Departing Thu, 15 Apr.One-way flight with United.Outbound direct flight with United departs from St Louis on Thu, 15 Apr, arriving in Denver International.Price includes taxes and charges.From Rs87,454, select.

Find the cheapest month to fly from St Louis to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Denver International flights are currently cheapest in October.
Jul
from Rs52,605
Aug
from Rs13,561
Sep
from Rs13,533
Oct
from Rs13,523
Nov
from Rs24,446
Dec
from Rs25,871
Jan
from Rs28,007
Feb
Find prices
Mar
Find prices
Apr
from Rs54,906
May
Find prices
Jun
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Direct flights from St Louis to Denver International

St Louis to Denver International: Alternative routes

Compare routes from St Louis to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Denver International

30km from central Denver
ClosestCheapest
from Rs13,523
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St Louis to Denver: Flight information

The things to know before you go.
Cheapest flight foundRs13,523
Cheapest month to flyOctober
Average flight time2 hrs, 23 mins
Most popular airlineSouthwest Airlines
Average flights per week92

Finding cheap flights from St Louis to Denver International: Frequently asked questions

The best price we found for a return flight from St Louis to Denver International is Rs27,120. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 23 minutes is the average flight time from St Louis to Denver International.
Southwest Airlines, United and Air Canada fly direct from St Louis to Denver International.
As of July 2026, there are 92 flights per week flying from St Louis to Denver International.
The cheapest month to fly from St Louis to Denver International is usually October.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Denver International Airport on Wednesday, 14 October 2026.
Yes – the average flight time is 2 hours and 23 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Currently, Frontier Airlines offers the cheapest flight tickets to Denver International.

Flying from St Louis Airport (STL) to Denver International Airport (DEN): what you need to know

  • The average time for a direct flight from St Louis Airport to Denver International Airport is 2 hours 20 minutes.

  • Denver is one hour behind St Louis and observes the UTC-7 timezone.

  • Take your pick of 51 weekly St Louis Airport to Denver International Airport flights. The 05:15 departure with United Airlines is the earliest flight available. Southwest Airlines operates the last service of the day at 22:45.

  • Your STL to DEN flight won't wait if you're late, so don't forget to check in on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • During popular months like July, you'll want to get to the airport even earlier. Arrive two hours before domestic departures and four hours ahead for an international flight whenever you're flying during a peak period in general.

  • With direct flights from St Louis Airport to Denver International Airport available through a range of airlines, flying to Denver (and then other destinations in the United States) is a cinch. You can travel nonstop with these carriers:

  • Most travellers choose to fly with Southwest Airlines on this route.

  • Frontier Airlines is the most punctual carrier offering STL to DEN flights. A reliable 88.89% of its departures on this route arrive as planned.

  • We make it simple to book a flight with a stopover. To see your options for tickets from St Louis Airport to Denver International Airport, deselect 'Direct flights only.' Then, choose a flight that has a stop long enough to tour the city of your choice. Some great stopovers between STL and DEN include:

    • Minneapolis St Paul Airport

    • Kansas City International Airport

    • Dallas Love Field Airport

How to find the cheapest flights from St Louis Airport (STL) to Denver International Airport (DEN)

  • Rs13,523 is currently the lowest price for a one-way St Louis Airport to Denver International Airport flight. Return flights start from Rs27,120. These prices may change depending on availability.

  • Don't leave everything to the last moment. You're more likely to find cheap tickets from STL to DEN if you book ahead. Airlines often have some great early bird discounts.

  • May is the cheapest month for flights from St Louis Airport to Denver International Airport. If you need to travel during a different time of year, the 'Whole month' tool will show you the lowest airfares for every month.

  • Getting your hands on cheap flights from STL to DEN is a breeze with Price Alerts. Simply create one of these automatic alerts and we'll let you know when a new discounted fare appears.

  • Tailor your flights using filters. Select your ideal departure and arrival times, total journey duration and airlines. You can also sort the results by 'Cheapest,' 'Fastest' or 'Best' flights from St Louis Airport to Denver International Airport.

Handy information about St Louis Airport (STL)

Arriving at Denver International Airport (DEN)

  • Once your St Louis Airport to Denver International Airport flight has landed, unwind at a hotel close by. Baymont by Wyndham Denver International Airport is a comfortable option within easy reach of DEN.

  • Travel at your own pace with a Denver International Airport rental car. Book your wheels from Routes Car Rentals, Dollar or Budget and see more of Denver and beyond.

  • For the lowest price, reserve your ride from Denver International Airport about one week in advance.

When to fly to Denver International Airport (DEN)

  • It's time to choose your travel dates for your flight from St Louis Airport to Denver International Airport. July is the most popular month to head to Denver. If you like a quieter vibe, go in January.

  • When reserving your flight from St Louis Airport to Denver International Airport, think about the kind of weather you enjoy. July is the warmest month in Denver, with temperatures ranging from 14ºC to 32ºC.

  • If you like travelling in cooler conditions, look for a cheap ticket from STL to DEN in January. Average temperatures are between -9ºC and 7ºC then.

Explore more of the United States

  • You've visited Denver, now it's time to explore more of the United States. Journey around 105 kilometres south to Colorado Springs to tick off its popular sights. From Garden of the Gods to Pikes Peak Region Attractions and Red Rock Canyon, you've got a jam-packed schedule ahead.

  • Aurora is another standout destination in the United States and is around 13 kilometres east of Denver. No trip is complete without dropping by Plains Conservation Centre, DeLaney Homestead Historic District and Aircraft viewing.

Plan the rest of your trip from St Louis to Denver

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.