$40+ Cheap flights from Denver (DEN) to St. Charles, MO
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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
fev 28 — mar 71
1 adult, Economy
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Find cheap flights from Denver to St. Charles 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 St. Charles are usually found in January or February, booked 74 days in advance, depart on a Friday or Saturday and return on a Wednesday
Cheap flight deals from Denver to St. Charles
Cheapest
Best
Last-minute
One-way
Cheapest flights from Denver to St. CharlesExplore the most affordable flight options available from Denver to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on janeiro 29, 2026.
Explore the most affordable flight options available from Denver to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on janeiro 29, 2026.
This Super.com deal was found by Cheapflights users on 1/28. 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.
sex 2/63:38 pm
DEN
- STL
Nonstop2h 06m
Frontier
dom 2/812:03 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 1/28![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 1/28. 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.
sex 2/2010:01 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 2/231:54 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 1/28![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
qua 3/186:35 am
DEN
- STL
Nonstop2h 14m
Frontier
sáb 3/218:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/29![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
sáb 2/2810:48 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 3/28:22 pm
STL
- DEN
1 stop16h 34m
Frontier
Deal found 1/27![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 1/28. 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.
sáb 3/146:35 am
DEN
- STL
Nonstop2h 14m
Frontier
sáb 3/218:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/28![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
sáb 2/282:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 1/28![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 1/28. 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.
sáb 3/146:35 am
DEN
- STL
Nonstop2h 14m
Frontier
sex 3/208:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/28![Frontier logo]()
$89
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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.
qua 2/2512:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
qua 3/48:17 pm
STL
- DEN
1 stop12h 22m
Frontier
Deal found 1/28![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 2/231:54 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 1/28![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
sex 3/68:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/28![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
seg 2/2310:01 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 3/28:22 pm
STL
- DEN
1 stop16h 34m
Frontier
Deal found 1/28![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
sex 2/2711:49 am
DEN
- STL
1 stop18h 02m
Frontier
qua 3/45:18 pm
STL
- DEN
Nonstop2h 35m
Frontier
Deal found 1/28![Frontier logo]()
$111
Best flights from Denver to St. CharlesDiscover carefully curated flight deals from Denver to St. Charles that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated janeiro 29, 2026.
Discover carefully curated flight deals from Denver to St. Charles that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated janeiro 29, 2026.
This Frontier deal was found by Cheapflights users on 1/29. 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.
seg 3/236:35 am
DEN
- STL
Nonstop2h 14m
Frontier
sex 3/278:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/29![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
sáb 3/76:35 am
DEN
- STL
Nonstop2h 14m
Multiple Airlines
seg 3/97:47 am
STL
- DEN
2 stops14h 47m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$162
This Delta deal was found by Cheapflights users on 1/28. 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.
ter 3/1712:35 am
DEN
- STL
1 stop8h 11m
Delta
qua 3/186:12 pm
STL
- DEN
1 stop5h 18m
Delta
Deal found 1/28![Delta logo]()
$217
This CheapOair deal was found by Cheapflights users on 1/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 3/57:24 pm
DEN
- STL
1 stop10h 38m
Frontier
sáb 3/78:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/28![Frontier logo]()
$122
This Southwest deal was found by Cheapflights users on 1/27. 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.
sex 2/279:40 pm
DEN
- STL
Nonstop2h 10m
Southwest
dom 3/14:35 pm
STL
- DEN
Nonstop2h 25m
Southwest
Deal found 1/27![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 1/28. 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.
qui 4/91:48 pm
DEN
- STL
Nonstop2h 08m
United Airlines
seg 4/138:54 am
STL
- DEN
Nonstop2h 33m
United Airlines
Deal found 1/28![United Airlines logo]()
$270
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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.
seg 2/99:41 am
DEN
- STL
Nonstop2h 09m
Frontier
ter 2/103:49 pm
STL
- DEN
1 stop8h 10m
Frontier
Deal found 1/29![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
qua 3/186:35 am
DEN
- STL
Nonstop2h 14m
Multiple Airlines
qui 3/199:50 am
STL
- DEN
3 stops14h 14m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$265
This Southwest deal was found by Cheapflights users on 1/27. 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.
seg 2/236:15 am
DEN
- STL
Nonstop2h 15m
Southwest
qui 2/264:35 pm
STL
- DEN
Nonstop2h 25m
Southwest
Deal found 1/27![Southwest logo]()
$270
Last-minute flights from Denver to St. CharlesDiscover last-minute flight deals from Denver to St. Charles. Data last updated janeiro 29, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to St. Charles. Data last updated janeiro 29, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 1/28. 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.
sex 2/63:38 pm
DEN
- STL
Nonstop2h 06m
Frontier
dom 2/812:03 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 1/28![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 1/28. 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.
sex 2/2010:01 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 2/231:54 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 1/28![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
sáb 2/282:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 1/28![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 2/231:54 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 1/28![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
sex 3/68:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 1/28![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 3/21:54 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 1/28![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
seg 2/2310:01 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 3/28:22 pm
STL
- DEN
1 stop16h 34m
Frontier
Deal found 1/28![Frontier logo]()
$106
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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.
qua 2/2512:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
qua 3/48:17 pm
STL
- DEN
1 stop12h 22m
Frontier
Deal found 1/28![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
sex 2/2711:49 am
DEN
- STL
1 stop18h 02m
Frontier
qua 3/45:18 pm
STL
- DEN
Nonstop2h 35m
Frontier
Deal found 1/28![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
sáb 2/2810:48 am
DEN
- STL
Nonstop2h 08m
Frontier
seg 3/28:22 pm
STL
- DEN
1 stop16h 34m
Frontier
Deal found 1/27![Frontier logo]()
$84
One-way flights from Denver to St. CharlesSearch for one-way flight options from Denver to St. Charles. Find affordable one-way fares based on user searches. Data last updated janeiro 29, 2026.
Search for one-way flight options from Denver to St. Charles. Find affordable one-way fares based on user searches. Data last updated janeiro 29, 2026.
This Super.com deal was found by Cheapflights users on 1/29. 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.
sex 2/63:38 pm
DEN
- STL
Nonstop2h 06m
Frontier
Deal found 1/29![Frontier logo]()
$40
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
sáb 4/46:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/29![Frontier logo]()
$43
This Expedia deal was found by Cheapflights users on 1/28. 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.
qua 4/16:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/28![Frontier logo]()
$44
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
seg 3/236:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 1/28![Frontier logo]()
$48
This Frontier deal was found by Cheapflights users on 1/28. 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.
sex 3/276:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 1/28![Frontier logo]()
$49
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
sex 2/1310:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/29![Frontier logo]()
$53
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
ter 3/1011:59 pm
DEN
- STL
1 stop9h 38m
Frontier
Deal found 1/29![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
ter 3/31:42 pm
DEN
- STL
1 stop16h 09m
Frontier
Deal found 1/28![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 1/28. 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.
sex 4/36:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/28![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
sáb 2/2110:48 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/29![Frontier logo]()
$64
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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.
qua 2/1812:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Deal found 1/28![Frontier logo]()
$65
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
ter 2/249:25 am
DEN
- STL
1 stop12h 02m
Frontier
Deal found 1/29![Frontier logo]()
$69
Find flight deals from Denver to St. Charles
Keep the following information in mind while searching for Denver to St. Charles flight deals. Data was last updated janeiro 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $79 (Super.com) |
One-way from | $40 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $181 |
Cheapflights Fare Finder
Customize your flight search to find flights from Denver to St. Charles 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 janeiro 29, 2026.
Use the filters below to find and compare flights from Denver to St. Charles that are best for you.
Fly from
Denver
Fly to
St. Charles
Route
Depart
Return
Price
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
seg 3/23
6:35 am-9:49 am
Nonstop2h 14m
Lambert-St Louis
sex 3/27
8:12 pm-9:49 pm
Nonstop2h 37m
$118
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
qui 3/5
7:24 pm-7:02 am
1 stop10h 38m
Lambert-St Louis
sáb 3/7
8:12 pm-9:49 pm
Nonstop2h 37m
$122
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
sáb 3/7
6:35 am-9:49 am
Nonstop2h 14m
Lambert-St Louis
seg 3/9
7:47 am-9:34 pm
2 stops14h 47m
$162
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
seg 2/9
9:41 am-12:50 pm
Nonstop2h 09m
Lambert-St Louis
ter 2/10
3:49 pm-10:59 pm
1 stop8h 10m
$180
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
ter 3/17
12:35 am-9:46 am
1 stop8h 11m
Lambert-St Louis
qua 3/18
6:12 pm-10:30 pm
1 stop5h 18m
$217
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
sex 2/27
9:40 pm-12:50 am
Nonstop2h 10m
Lambert-St Louis
dom 3/1
4:35 pm-6:00 pm
Nonstop2h 25m
$262
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
qua 3/18
6:35 am-9:49 am
Nonstop2h 14m
Lambert-St Louis
qui 3/19
9:50 am-11:04 pm
3 stops14h 14m
$265
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
qui 4/9
1:48 pm-4:56 pm
Nonstop2h 08m
Lambert-St Louis
seg 4/13
8:54 am-10:27 am
Nonstop2h 33m
$270
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
seg 2/23
6:15 am-9:30 am
Nonstop2h 15m
Lambert-St Louis
qui 2/26
4:35 pm-6:00 pm
Nonstop2h 25m
$270
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
sex 2/6
3:38 pm-6:44 pm
Nonstop2h 06m
$40
Showing 1-10 of 17 results
Best time to book a flight from Denver to St. Charles
Have a flexible travel schedule? Discover the best time to fly to St. Charles 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. Charles
DEN-CH5
DEN-STL
How far ahead should I book a flight from Denver to St. Charles?
Use this chart to determine the optimal time to book a round-trip flight from Denver to St. Charles. Price data was last updated on January 23, 2026.
To ensure you get the cheapest price possible for a flight from Denver to St. Charles, you should look to book at least 74 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Denver to St. Charles?
Currently, February is the cheapest month in which you can book a flight from Denver to St. Charles (average of $37). Flying from Denver to St. Charles 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 CH5?
Find hourly flight availability from Denver to St. Charles. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated janeiro 29, 2026.
A simple way to save on the total cost of your ticket is to fly from Denver to St. Charles at noon. If you’re flexible enough to do this you can expect to save up to 13% on your trip compared to booking a flight in the afternoon.
What is the cheapest day to fly from Denver to St. Charles?
Use this chart to determine the cheapest time to fly round-trip from Denver to St. Charles. Price data was last updated on January 24, 2026.
Travelers seeking maximum savings on their Denver to St. Charles 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.
Weekly flight availability from Denver to St. Charles
Explore weekly flight availability from Denver to St. Charles. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated janeiro 29, 2026.
The most flights from DEN to CH5 are scheduled on a Wednesday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).
Reviews of airlines servicing St. Charles
Get insights into the airlines that provide service to St. Charles. 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. Charles. Reviews last updated janeiro 29, 2026.
See what other customers who have flown with Southwest, United Airlines, and Frontier from Denver to St. Charles have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
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. Charles. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Denver to St. Charles
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from Denver to St. Charles
Discover the top 4 airlines that operate flights from Denver to St. Charles. 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 janeiro 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$52 | Average$158 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$136 | Average$467 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$154 | Average$294 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$177 | Average$305 | FlexibilityNo cancel fee | On-time63% |