$28 Cheap flight deals from Fort Collins (DEN) to St. Louis (STL)

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This Weekend's Flight Deals from Fort Collins to St. Louis

This weekend's flight prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Mar 1 - Tue, Mar 10
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$183 Roundtrip, found 4 days ago
$183
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sun, Mar 1 from Denver Intl. to Lambert-St. Louis Intl., returning Tue, Mar 10, priced at $183 found 4 days ago

Airfares from $28 One Way, $57 Round Trip from Fort Collins to St. Louis

Prices starting at $57 for return flights and $28 for one-way flights to St. Louis were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Apr 18 - Sat, Apr 25
DEN
Denver
STL
St. Louis
$57 Roundtrip, found 1 day ago
$57
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Apr 18 from Denver to St. Louis, returning Sat, Apr 25, priced at $57 found 1 day ago
Wed, Mar 18 - Sat, May 9
DEN
Denver
STL
St. Louis
$63 Roundtrip, found 1 day ago
$63
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Mar 18 from Denver to St. Louis, returning Sat, May 9, priced at $63 found 1 day ago
Thu, May 7 - Sat, May 9
DEN
Denver
STL
St. Louis
$70 Roundtrip, found 20 hours ago
$70
Roundtrip
found 20 hours ago
Select Frontier Airlines flight, departing Thu, May 7 from Denver to St. Louis, returning Sat, May 9, priced at $70 found 20 hours ago
Mon, Apr 20 - Sat, Apr 25
DEN
Denver
STL
St. Louis
$175 Roundtrip, found 3 days ago
$175
Roundtrip
found 3 days ago
Select United flight, departing Mon, Apr 20 from Denver to St. Louis, returning Sat, Apr 25, priced at $175 found 3 days ago
Mon, Apr 20 - Sat, Apr 25
DEN
Denver
STL
St. Louis
$195 Roundtrip, found 3 days ago
$195
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Apr 20 from Denver to St. Louis, returning Sat, Apr 25, priced at $195 found 3 days ago

St. Louis economy flight packages

Price found within the past 48 hours. Click for updated prices.
The Wildwood Hotel
3.5-star property

The Wildwood Hotel

9.2/10 Wonderful! (1,600 reviews)

Mar 27 - Mar 29

2 night stay

Denver (DEN) to St. Louis (STL)

United • Roundtrip • Coach
Price was $601, price is now $409 per person
$409
per person
found 23 hours ago
This hotel was fantastic! Check in was easy with friendly staff, the room was beautiful and well appointed. Breakfast was advertised as a Continental, however they had hot options as well, which was great. Every staff member we saw in the hotel said hi and was friendly. I would definitely stay here again!

Reviewed on Oct 16, 2025

Landing Apartments - Eureka
4.0-star property

Landing Apartments - Eureka

No reviews

Mar 27 - Mar 29

2 night stay

Denver (DEN) to St. Louis (STL)

United • Roundtrip • Coach
Price was $804, price is now $664 per person
$664
per person
found 23 hours ago
21C Museum Hotel St Louis
4.5-star property

21C Museum Hotel St Louis

9/10 Wonderful! (1,458 reviews)

Mar 27 - Mar 29

2 night stay

Denver (DEN) to St. Louis (STL)

United • Roundtrip • Coach
Price was $802, price is now $666 per person
$666
per person
found 23 hours ago
The cafe that sold breakfast ran out of healthy options each morning (yogurt parfait cup/ overnight oats & quinoa $8 each) They had other plates, egg with meat, etc that looked nice fwiw. Cute gift shop in the cafe. Fashionable hotel with no real 'front desk' just a checkin counter, but volunteers were staffing a St. Louis info table in the lobby while we were there- very friendly. The bar/tapas restaurant across the lobby was fun, $$, and kitchen closed at 10 or so when our events got out so I didn't get to try it. LOVED the historic building, originally a YMCA, the handsome billiards room and the terrific tiled pool with vaulted ceiling- they don't make them like that anymore. Steam room, sauna, showers were great- bring a room towel in case the spa runs short! Open til 10:30p or 11p fyi. Art Museum on the 2nd floor is free to visitors, and had some challenging, gorgeous, funny, and thought-provoking art. Historic Campbell Mansion next door was a neat contrast and a quick peek into the high Victorian era. Glad I went, would stay again

Reviewed on Jan 14, 2026

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More About Flying To St. Louis from Fort Collins

Route Information for Flights from Fort Collins to St. Louis

Origin Airport IATA Code
DEN
Destination Airport IATA Code
STL
Distance
Direct Flight Airlines
Earliest Flight Arrival
Latest Flight Arrival

Fort Collins to St. Louis

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Frequently asked questions

Are there non-stop flights from Fort Collins to St. Louis?
You'll find 3 airlines that fly nonstop from DIA airport to Lambert Field, so get ready to hit that "book" button. One of these carriers will have your ideal flight:

  • Southwest Airlines
  • United Airlines
  • Frontier Airlines

What is the shortest flight from Fort Collins to St. Louis?
It can zip by in as little as 1 hour and 55 minutes. If you're of the opinion that your vacation hours should be spent 'vacationing' rather than flying, you'll enjoy the journey from Fort Collins to St. Louis.
What airlines fly from Fort Collins to St. Louis most frequently?
Southwest Airlines (WN) is one of the carriers with the most flights from Denver, CO (DEN-Denver Intl.) to Lambert Field. It offers 160 flights on this route every month. Taking off on a vacation is one of life's greatest pleasures, and this airline will get you to your destination quickly and safely. United Airlines (UA) will also take you to your destination in comfort. Offering 121 flights every month between Fort Collins and St. Louis, it's another quality airline to look into.
What is the cheapest day of the week to fly?
Consider flying out early in the week to save on your airfare. Orbitz data from 2021 shows that Monday is the cheapest day to depart, followed by Tuesday. Saturday showed the highest average ticket prices likely because many travelers prefer to start their vacation on a weekend.
What is the cheapest month to fly?
We won't keep you guessing, according to Orbitz data from 2021, the cheapest month to fly is February. Perfect for those who need a weekend getaway, or just a break from it all in the shortest month of the year. Be aware that the most expensive time to fly is during the height of summer in July, and in the holiday month of December.*According to flight demand on Orbitz.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

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Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.