$106+ 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 7/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Jul 16 — Jul 231
Round-trip
1 adult, Economy
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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 51 days in advance, depart on a Friday or Saturday and return on a Saturday
Cheap flight deals from Denver to St. Louis
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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 June 16, 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 June 16, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 7/244:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Tue 7/288:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/15![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 8/184:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Sat 8/228:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/12![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 6/11. 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 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/11![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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.
Wed 7/154:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/188:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/12![Frontier logo]()
$169
This Cheapflightsfares deal was found by Cheapflights users on 6/13. 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.
Wed 7/14:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Tue 7/78:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/13![Frontier logo]()
$170
This Frontier deal was found by Cheapflights users on 6/13. 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.
Sat 8/154:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Mon 8/178:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/13![Frontier logo]()
$171
This Frontier deal was found by Cheapflights users on 6/14. 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 7/244:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Wed 7/298:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/14![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 7/14:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Sat 7/47:38 pm
STL
- DEN
Nonstop2h 26m
Frontier
Deal found 6/14![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 7/144:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Mon 7/277:10 pm
STL
- DEN
1 stop9h 38m
Frontier
Deal found 6/15![Frontier logo]()
$177
This Frontier deal was found by Cheapflights users on 6/11. 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.
Thu 7/94:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/11![Frontier logo]()
$178
This Cheapflightsfares deal was found by Cheapflights users on 6/14. 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 9/104:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Sun 9/138:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 6/14![Frontier logo]()
$179
This Cheapflightsfares deal was found by Cheapflights users on 6/13. 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.
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Tue 7/148:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/13![Frontier logo]()
$180
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 June 16, 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 June 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 7/144:25 pm
DEN
- STL
1 stop24h 40m
Frontier
Tue 7/218:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/15![Frontier logo]()
$177
This Delta deal was found by Cheapflights users on 6/12. 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 7/810:52 am
DEN
- STL
1 stop6h 01m
Delta
Tue 7/142:30 pm
STL
- DEN
1 stop8h 31m
Delta
Deal found 6/12![Delta logo]()
$225
This American Airlines deal was found by Cheapflights users on 6/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:57 pm
DEN
- STL
1 stop5h 19m
American Airlines
Tue 7/212:46 pm
STL
- DEN
1 stop8h 17m
American Airlines
Deal found 6/15![American Airlines logo]()
$225
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 9/239:35 am
DEN
- STL
Nonstop2h 05m
United Airlines
Wed 9/301:36 pm
STL
- DEN
Nonstop2h 24m
United Airlines
Deal found 6/12![United Airlines logo]()
$285
This Southwest deal was found by Cheapflights users on 6/11. 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 8/48:55 am
DEN
- STL
2 stops6h 30m
Southwest
Fri 8/72:15 pm
STL
- DEN
1 stop4h 50m
Southwest
Deal found 6/11![Southwest logo]()
$302
This Frontier deal was found by Cheapflights users on 6/15. 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 9/254:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Sun 9/278:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 6/15![Frontier logo]()
$178
This Southwest deal was found by Cheapflights users on 6/15. 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 7/148:05 am
DEN
- STL
1 stop5h 45m
Southwest
Tue 7/218:35 am
STL
- DEN
2 stops6h 00m
Southwest
Deal found 6/15![Southwest logo]()
$318
This United Airlines deal was found by Cheapflights users on 6/13. 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 10/61:30 pm
DEN
- STL
Nonstop2h 07m
United Airlines
Sun 10/115:10 am
STL
- DEN
Nonstop2h 33m
United Airlines
Deal found 6/13![United Airlines logo]()
$366
This Southwest deal was found by Cheapflights users on 6/15. 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 8/63:15 pm
DEN
- STL
2 stops5h 50m
Southwest
Wed 8/122:50 pm
STL
- DEN
1 stop3h 30m
Southwest
Deal found 6/15![Southwest logo]()
$346
This United Airlines deal was found by Cheapflights users on 6/13. 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.
Fri 9/181:27 pm
DEN
- STL
Nonstop2h 07m
United Airlines
Tue 9/225:10 am
STL
- DEN
Nonstop2h 33m
United Airlines
Deal found 6/13![United Airlines logo]()
$366
This Southwest deal was found by Cheapflights users on 6/12. 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.
Fri 7/37:40 am
DEN
- STL
2 stops5h 30m
Southwest
Tue 7/72:10 pm
STL
- DEN
1 stop5h 35m
Southwest
Deal found 6/12![Southwest logo]()
$350
Last-minute flights from Denver to St. LouisDiscover last-minute flight deals from Denver to St. Louis. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to St. Louis. Data last updated June 16, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 6/13. 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.
Wed 7/14:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Tue 7/78:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/13![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 7/14:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Sat 7/47:38 pm
STL
- DEN
Nonstop2h 26m
Frontier
Deal found 6/14![Frontier logo]()
$176
This Frontier deal was found by Cheapflights users on 6/11. 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 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/11![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 6/13. 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.
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Tue 7/148:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/13![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 6/11. 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.
Thu 7/94:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/11![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 7/144:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Mon 7/277:10 pm
STL
- DEN
1 stop9h 38m
Frontier
Deal found 6/15![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 7/144:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Fri 7/314:57 pm
STL
- DEN
1 stop17h 06m
Frontier
Deal found 6/15![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 7/144:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Thu 7/307:10 pm
STL
- DEN
1 stop9h 38m
Frontier
Deal found 6/15![Frontier logo]()
$182
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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.
Wed 7/154:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/188:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/12![Frontier logo]()
$169
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 7/244:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Tue 7/288:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/15![Frontier logo]()
$166
This Frontier deal was found by Cheapflights users on 6/14. 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 7/244:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Wed 7/298:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/14![Frontier logo]()
$172
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 June 16, 2026.
Search for one-way flight options from Denver to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This Frontier deal was found by Cheapflights users on 6/12. 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.
Tue 7/74:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/12![Frontier logo]()
$106
This Frontier deal was found by Cheapflights users on 6/11. 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.
Sat 7/114:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/11![Frontier logo]()
$107
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/78:45 pm
DEN
- STL
Nonstop2h 12m
United Airlines
Deal found 6/11![United Airlines logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 8/246:10 pm
DEN
- STL
1 stop19h 38m
Frontier
Deal found 6/11![Frontier logo]()
$110
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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.
Wed 8/54:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/15![Frontier logo]()
$111
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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.
Sun 8/94:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/12![Frontier logo]()
$112
This Delta deal was found by Cheapflights users on 6/15. 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.
Mon 8/1012:50 am
DEN
- STL
1 stop8h 04m
Delta
Deal found 6/15![Delta logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 8/116:30 am
DEN
- STL
1 stop10h 07m
Frontier
Deal found 6/11![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 6/11. 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.
Sat 8/1511:59 pm
DEN
- STL
1 stop16h 38m
Frontier
Deal found 6/11![Frontier logo]()
$118
This Delta deal was found by Cheapflights users on 6/11. 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.
Tue 7/76:05 am
DEN
- STL
1 stop6h 00m
Delta
Deal found 6/11![Delta logo]()
$119
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 June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $166 (Cheapflightsfares) |
One-way from | $106 (Frontier) |
Popular in | June |
Cheapest in | January |
Average price | $327 |
Good round-trip deal | $273 or less |
Good one-way deal | $171 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 June 16, 2026.
Use the filters below to find and compare flights from Denver to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 7/14
4:25 pm-6:05 pm
1 stop24h 40m
Lambert-St Louis
Tue 7/21
8:08 pm-9:44 pm
Nonstop2h 36m
$177
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Fri 9/25
4:12 pm-7:15 pm
Nonstop2h 03m
Lambert-St Louis
Sun 9/27
8:10 pm-9:49 pm
Nonstop2h 39m
$178
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Wed 7/8
10:52 am-5:53 pm
1 stop6h 01m
Lambert-St Louis
Tue 7/14
2:30 pm-10:01 pm
1 stop8h 31m
$225
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 7/14
5:57 pm-12:16 am
1 stop5h 19m
Lambert-St Louis
Tue 7/21
2:46 pm-10:03 pm
1 stop8h 17m
$225
Quickest round-trip
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Wed 9/23
9:35 am-12:40 pm
Nonstop2h 05m
Lambert-St Louis
Wed 9/30
1:36 pm-3:00 pm
Nonstop2h 24m
$285
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 8/4
8:55 am-4:25 pm
2 stops6h 30m
Lambert-St Louis
Fri 8/7
2:15 pm-6:05 pm
1 stop4h 50m
$302
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 7/14
8:05 am-2:50 pm
1 stop5h 45m
Lambert-St Louis
Tue 7/21
8:35 am-1:35 pm
2 stops6h 00m
$318
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Thu 8/6
3:15 pm-10:05 pm
2 stops5h 50m
Lambert-St Louis
Wed 8/12
2:50 pm-5:20 pm
1 stop3h 30m
$346
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Fri 7/3
7:40 am-2:10 pm
2 stops5h 30m
Lambert-St Louis
Tue 7/7
2:10 pm-6:45 pm
1 stop5h 35m
$350
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 10/6
1:30 pm-4:37 pm
Nonstop2h 07m
Lambert-St Louis
Sun 10/11
5:10 am-6:43 am
Nonstop2h 33m
$366
Showing 1-10 of 22 resultsSorted by cheapest first
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 June.
| 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 Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star |
- 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?
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 50 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, January is the cheapest month in which you can book a flight from Denver to St. Louis (average of $166). Flying from Denver to St. Louis in June is currently the most expensive (average of $327). 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 June 16, 2026.
It’s optimal to fly from Denver to St. Louis in the afternoon. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight at noon.
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 June 13, 2026.
Travelers seeking maximum savings on their Denver to St. Louis flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday at noon 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 June 16, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andFrontier 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.
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Alton
Farmington
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Denver and St. Louis flights
Browse other Denver and St. Louis flight options. Last updated on June 16, 2026.
Other flights from Denver
Browse through other flights departing from Denver. Flights are based on user searches made on Cheapflights and were last updated on June 16, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 16, 2026.
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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$182 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$340 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$181 | Average$327 | FlexibilityNo cancel fee | On-time69% |