$40+ Cheap flights from Denver to St. Louis (DEN - STL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Mar 5 — Mar 121
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Denver to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Denver Intl to Lambert-St Louis are usually found in January or August, booked 74 days in advance, depart on a Friday or Saturday and return on a Wednesday
Cheap flight deals from Denver to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Denver to St. LouisExplore the most affordable flight options available from Denver to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
Explore the most affordable flight options available from Denver to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
This Super.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2512:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Sat 2/282:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 2/1![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2010:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Wed 2/254:51 pm
STL
- DEN
Nonstop2h 34m
Frontier
Deal found 2/1![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/212:59 am
DEN
- STL
1 stop28h 52m
Frontier
Sat 3/78:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 2/1![Frontier logo]()
$84
This Super.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/276:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Mon 3/308:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/31![Frontier logo]()
$88
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/286:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Sat 4/48:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 2/1![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/412:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Wed 3/1111:32 am
STL
- DEN
1 stop12h 32m
Frontier
Deal found 2/2![Frontier logo]()
$106
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
Mon 2/238:47 pm
STL
- DEN
1 stop12h 07m
Frontier
Deal found 2/1![Frontier logo]()
$107
This Mytrip deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/2411:59 pm
DEN
- STL
1 stop21h 28m
Frontier
Fri 2/271:59 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 2/1![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1812:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Sat 2/212:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 1/31![Frontier logo]()
$111
This Cheapflightsfares deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2010:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Thu 2/2610:11 pm
STL
- DEN
1 stop21h 09m
Frontier
Deal found 2/2![Frontier logo]()
$113
Best flights from Denver to St. LouisDiscover carefully curated flight deals from Denver to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
Discover carefully curated flight deals from Denver to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
This Frontier deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/236:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Fri 3/278:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 2/2![Frontier logo]()
$114
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:10 am
DEN
- STL
Nonstop2h 10m
Southwest
Sat 3/76:30 pm
STL
- DEN
Nonstop2h 25m
Southwest
Deal found 2/1![Southwest logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/1611:25 pm
DEN
- STL
2 stops30h 26m
Multiple Airlines
Fri 2/208:20 pm
STL
- DEN
1 stop17h 18m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$232
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:45 pm
DEN
- STL
Nonstop2h 09m
United Airlines
Wed 4/292:40 pm
STL
- DEN
Nonstop2h 34m
United Airlines
Deal found 2/2![United Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/254:00 pm
DEN
- STL
1 stop7h 21m
Delta
Fri 3/276:12 pm
STL
- DEN
1 stop5h 19m
Delta
Deal found 1/31![Delta logo]()
$268
This Cheapflightsfares deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:24 pm
DEN
- STL
1 stop10h 38m
Frontier
Sat 3/77:47 am
STL
- DEN
1 stop15h 37m
Frontier
Deal found 2/2![Frontier logo]()
$197
This Southwest deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
DEN
- STL
Nonstop2h 10m
Southwest
Fri 3/276:15 am
STL
- DEN
Nonstop2h 25m
Southwest
Deal found 1/31![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:40 pm
DEN
- STL
Nonstop2h 10m
Southwest
Mon 4/135:15 pm
STL
- DEN
Nonstop2h 20m
Southwest
Deal found 2/1![Southwest logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/162:02 pm
DEN
- STL
2 stops15h 48m
Frontier
Sun 4/199:55 pm
STL
- DEN
1 stop7h 04m
Frontier
Deal found 2/2![Frontier logo]()
$278
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:00 am
DEN
- STL
1 stop5h 12m
Frontier
Sun 4/1911:21 am
STL
- DEN
2 stops20h 39m
Frontier
Deal found 2/2![Frontier logo]()
$281
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/56:25 am
DEN
- STL
Nonstop2h 10m
Southwest
Sat 3/76:30 pm
STL
- DEN
Nonstop2h 25m
Southwest
Deal found 2/1![Southwest logo]()
$282
This Southwest deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/288:40 am
DEN
- STL
1 stop3h 20m
Southwest
Wed 4/295:45 am
STL
- DEN
1 stop5h 25m
Southwest
Deal found 2/2![Southwest logo]()
$282
Last-minute flights from Denver to St. LouisDiscover last-minute flight deals from Denver to St. Louis. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to St. Louis. Data last updated February 3, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1812:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Sat 2/212:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 1/31![Frontier logo]()
$111
This Frontier deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2010:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Wed 2/254:51 pm
STL
- DEN
Nonstop2h 34m
Frontier
Deal found 2/1![Frontier logo]()
$80
This Cheapflightsfares deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2010:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Thu 2/2610:11 pm
STL
- DEN
1 stop21h 09m
Frontier
Deal found 2/2![Frontier logo]()
$113
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
Mon 2/238:47 pm
STL
- DEN
1 stop12h 07m
Frontier
Deal found 2/1![Frontier logo]()
$107
This Mytrip deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/2411:59 pm
DEN
- STL
1 stop21h 28m
Frontier
Fri 2/271:59 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 2/1![Frontier logo]()
$110
This Super.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2512:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Sat 2/282:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 2/1![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/212:59 am
DEN
- STL
1 stop28h 52m
Frontier
Sat 3/78:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 2/1![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/412:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Wed 3/1111:32 am
STL
- DEN
1 stop12h 32m
Frontier
Deal found 2/2![Frontier logo]()
$106
This Super.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/276:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Mon 3/308:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/31![Frontier logo]()
$88
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/286:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Sat 4/48:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 2/1![Frontier logo]()
$93
One-way flights from Denver to St. LouisSearch for one-way flight options from Denver to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
Search for one-way flight options from Denver to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This Mytrip deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/136:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 2/3![Frontier logo]()
$40
This Trip.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2310:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 2/3![Frontier logo]()
$42
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 2/1![Frontier logo]()
$43
This Expedia deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 2/3![Frontier logo]()
$44
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/276:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 2/3![Frontier logo]()
$48
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/1310:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 2/2![Frontier logo]()
$53
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1011:59 pm
DEN
- STL
1 stop9h 38m
Frontier
Deal found 2/3![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/212:59 am
DEN
- STL
1 stop28h 52m
Frontier
Deal found 2/1![Frontier logo]()
$61
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 2/2![Frontier logo]()
$63
This Cheapflightsfares deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:24 am
DEN
- STL
1 stop9h 22m
Frontier
Deal found 2/3![Frontier logo]()
$64
Find flight deals from Denver to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $79 (Super.com) |
One-way from | $40 (Mytrip) |
Popular in | June |
Cheapest in | January |
Average price | $196 |
Good round-trip deal | $133 or less |
Good one-way deal | $123 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Denver to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Denver to St. Louis that are best for you.
Fly from
Denver
Fly to
St. Louis
Route
Depart
Return
Price
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Mon 3/23
6:35 am-9:49 am
Nonstop2h 14m
Lambert-St Louis
Fri 3/27
8:12 pm-9:49 pm
Nonstop2h 37m
$114
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Thu 3/5
7:24 pm-7:02 am
1 stop10h 38m
Lambert-St Louis
Sat 3/7
7:47 am-10:24 pm
1 stop15h 37m
$197
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Sat 3/7
6:10 am-9:20 am
Nonstop2h 10m
Lambert-St Louis
Sat 3/7
6:30 pm-7:55 pm
Nonstop2h 25m
$217
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Mon 2/16
11:25 pm-6:51 am
2 stops30h 26m
Lambert-St Louis
Fri 2/20
8:20 pm-12:38 pm
1 stop17h 18m
$232
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Wed 3/25
6:00 am-9:10 am
Nonstop2h 10m
Lambert-St Louis
Fri 3/27
6:15 am-7:40 am
Nonstop2h 25m
$257
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 4/28
5:45 pm-8:54 pm
Nonstop2h 09m
Lambert-St Louis
Wed 4/29
2:40 pm-4:14 pm
Nonstop2h 34m
$267
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Wed 3/25
4:00 pm-12:21 am
1 stop7h 21m
Lambert-St Louis
Fri 3/27
6:12 pm-10:31 pm
1 stop5h 19m
$268
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Thu 4/9
8:40 pm-11:50 pm
Nonstop2h 10m
Lambert-St Louis
Mon 4/13
5:15 pm-6:35 pm
Nonstop2h 20m
$270
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Thu 4/16
2:02 pm-6:50 am
2 stops15h 48m
Lambert-St Louis
Sun 4/19
9:55 pm-3:59 am
1 stop7h 04m
$278
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Fri 4/17
8:00 am-2:12 pm
1 stop5h 12m
Lambert-St Louis
Sun 4/19
11:21 am-7:00 am
2 stops20h 39m
$281
Showing 1-10 of 24 results
Compare providers for flights from Denver to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to St. Louis in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*2 stars |
- Most accurate provider: When it comes to deals on Denver-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Denver-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Denver to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Denver with our price prediction graph.
DEN-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Denver to St. Louis
Prices
Airlines
How far ahead should I book a flight from Denver to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Denver to St. Louis. Price data was last updated on January 30, 2026.
The price you pay for your flight from Denver to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 74 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Denver to St. Louis?
Currently, February is the cheapest month in which you can book a flight from Denver to St. Louis (average of $38). Flying from Denver to St. Louis in July is currently the most expensive (average of $129). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from DEN to STL?
Find hourly flight availability from Denver to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 3, 2026.
It’s optimal to fly from Denver to St. Louis in the morning. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the afternoon.
What is the cheapest day to fly from Denver to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Denver to St. Louis. Price data was last updated on January 31, 2026.
Travelers seeking maximum savings on their Denver to St. Louis flight should consider departing on Friday mornings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Denver to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated February 3, 2026.
Get a feel of what it's like to fly with Southwest, United Airlines, and Frontier from Denver to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Denver to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for Denver to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Top 3 airlines flying from Denver to St. Louis
Discover the top 3 airlines that operate flights from Denver to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$53 | Average$158 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$155 | Average$321 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$177 | Average$307 | FlexibilityNo cancel fee | On-time63% |