$86+ Cheap flights from Sky Harbor Intl (PHX) 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Jul 13 — Jul 201
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Sky Harbor Intl 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 Phoenix Sky Harbor Intl to St. Charles are usually found in October or January, booked 25 days in advance, depart on a Friday or Saturday and return on a Wednesday
Cheap flight deals from Sky Harbor Intl to St. Charles
Cheapest
Best
Last-minute
One-way
Cheapest flights from Sky Harbor Intl to St. CharlesExplore the most affordable flight options available from Sky Harbor Intl to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 13, 2026.
Explore the most affordable flight options available from Sky Harbor Intl to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 13, 2026.
This Expedia deal was found by Cheapflights users on 6/10. 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 7/46:24 am
PHX
- STL
1 stop10h 10m
Frontier
Thu 7/237:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/10![Frontier logo]()
$303
This Expedia deal was found by Cheapflights users on 6/10. 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 7/46:40 am
PHX
- STL
1 stop10h 13m
Frontier
Fri 7/178:08 pm
STL
- PHX
1 stop24h 39m
Frontier
Deal found 6/10![Frontier logo]()
$304
This American Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 8/512:30 pm
PHX
- STL
Nonstop3h 07m
American Airlines
Sat 8/88:00 am
STL
- PHX
Nonstop3h 18m
American Airlines
Deal found 6/10![American Airlines logo]()
$305
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.
Fri 7/109:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Fri 7/174:57 pm
STL
- PHX
1 stop28h 40m
Frontier
Deal found 6/12![Frontier logo]()
$306
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.
Mon 7/139:58 pm
PHX
- STL
1 stop18h 07m
Frontier
Fri 7/174:57 pm
STL
- PHX
1 stop28h 40m
Frontier
Deal found 6/12![Frontier logo]()
$307
This Orbitz deal was found by Cheapflights users on 6/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/94:48 pm
PHX
- STL
1 stop24h 35m
Frontier
Mon 7/137:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/10![Frontier logo]()
$308
This Frontier deal was found by Cheapflights users on 6/10. 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 7/106:40 am
PHX
- STL
1 stop10h 43m
Frontier
Thu 7/163:41 pm
STL
- PHX
1 stop9h 18m
Frontier
Deal found 6/10![Frontier logo]()
$309
This Expedia deal was found by Cheapflights users on 6/10. 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.
Fri 7/2411:23 pm
PHX
- STL
1 stop7h 34m
Frontier
Sun 7/267:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/10![Frontier logo]()
$310
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.
Wed 7/12:00 pm
PHX
- STL
2 stops25h 30m
Frontier
Sun 7/197:10 pm
STL
- PHX
1 stop18h 17m
Frontier
Deal found 6/12![Frontier logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 8/46:53 pm
PHX
- STL
2 stops12h 04m
Frontier
Fri 8/77:10 pm
STL
- PHX
1 stop18h 17m
Frontier
Deal found 6/9![Frontier logo]()
$312
This American Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 7/298:39 am
PHX
- STL
Nonstop3h 14m
American Airlines
Tue 8/48:01 am
STL
- PHX
Nonstop3h 16m
American Airlines
Deal found 6/10![American Airlines logo]()
$313
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.
Thu 7/210:32 pm
PHX
- STL
1 stop13h 34m
Frontier
Mon 7/67:10 pm
STL
- PHX
2 stops22h 21m
Frontier
Deal found 6/11![Frontier logo]()
$314
Best flights from Sky Harbor Intl to St. CharlesDiscover carefully curated flight deals from Sky Harbor Intl to St. Charles that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 13, 2026.
Discover carefully curated flight deals from Sky Harbor Intl to St. Charles that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 13, 2026.
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 8/45:40 pm
PHX
- STL
Nonstop2h 55m
Southwest
Sun 8/98:30 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/11![Southwest logo]()
$352
This Delta deal was found by Cheapflights users on 6/9. 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 8/36:02 am
PHX
- STL
2 stops15h 24m
Delta
Wed 8/58:00 am
STL
- PHX
1 stop6h 06m
Delta
Deal found 6/9![Delta logo]()
$440
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.
Sat 9/59:23 am
PHX
- STL
2 stops10h 37m
United Airlines
Mon 9/75:30 pm
STL
- PHX
1 stop6h 52m
United Airlines
Deal found 6/11![United Airlines logo]()
$467
This Southwest deal was found by Cheapflights users on 6/8. 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 7/238:55 pm
PHX
- STL
Nonstop3h 00m
Southwest
Mon 7/277:20 am
STL
- PHX
Nonstop3h 15m
Southwest
Deal found 6/8![Southwest logo]()
$377
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 7/144:50 pm
PHX
- STL
1 stop4h 55m
Southwest
Tue 7/281:40 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/11![Southwest logo]()
$383
This Southwest deal was found by Cheapflights users on 6/10. 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 7/221:45 pm
PHX
- STL
Nonstop2h 55m
Southwest
Tue 7/285:35 am
STL
- PHX
1 stop6h 40m
Southwest
Deal found 6/10![Southwest logo]()
$387
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 7/2412:20 pm
PHX
- STL
1 stop8h 25m
United Airlines
Tue 7/286:00 am
STL
- PHX
2 stops11h 10m
United Airlines
Deal found 6/13![United Airlines logo]()
$490
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.
Thu 7/236:10 am
PHX
- STL
1 stop6h 06m
United Airlines
Thu 8/65:10 am
STL
- PHX
2 stops11h 32m
United Airlines
Deal found 6/12![United Airlines logo]()
$492
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.
Thu 8/136:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Sun 8/169:45 am
STL
- PHX
1 stop4h 55m
Southwest
Deal found 6/12![Southwest logo]()
$422
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.
Sat 6/278:05 pm
PHX
- STL
Nonstop2h 55m
Southwest
Tue 6/305:35 am
STL
- PHX
1 stop6h 40m
Southwest
Deal found 6/11![Southwest logo]()
$445
This Southwest deal was found by Cheapflights users on 6/10. 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 6/1610:50 am
PHX
- STL
1 stop4h 55m
Southwest
Sat 6/208:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/10![Southwest logo]()
$481
This Southwest deal was found by Cheapflights users on 6/8. 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 6/236:35 pm
PHX
- STL
Nonstop2h 55m
Southwest
Wed 6/2411:20 am
STL
- PHX
1 stop6h 15m
Southwest
Deal found 6/8![Southwest logo]()
$485
Last-minute flights from Sky Harbor Intl to St. CharlesDiscover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated June 13, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated June 13, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/8. 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.
Tue 6/2312:35 am
PHX
- STL
1 stop21h 14m
Frontier
Mon 6/297:38 pm
STL
- PHX
1 stop5h 51m
Frontier
Deal found 6/8![Frontier logo]()
$317
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.
Wed 7/12:00 pm
PHX
- STL
2 stops25h 30m
Frontier
Sun 7/197:10 pm
STL
- PHX
1 stop18h 17m
Frontier
Deal found 6/12![Frontier logo]()
$311
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.
Thu 7/210:32 pm
PHX
- STL
1 stop13h 34m
Frontier
Mon 7/67:10 pm
STL
- PHX
2 stops22h 21m
Frontier
Deal found 6/11![Frontier logo]()
$314
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.
Fri 7/311:40 pm
PHX
- STL
1 stop7h 12m
Frontier
Tue 7/76:34 pm
STL
- PHX
2 stops20h 00m
Frontier
Deal found 6/12![Frontier logo]()
$316
This Expedia deal was found by Cheapflights users on 6/10. 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 7/46:24 am
PHX
- STL
1 stop10h 10m
Frontier
Thu 7/237:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/10![Frontier logo]()
$303
This Expedia deal was found by Cheapflights users on 6/10. 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 7/46:40 am
PHX
- STL
1 stop10h 13m
Frontier
Fri 7/178:08 pm
STL
- PHX
1 stop24h 39m
Frontier
Deal found 6/10![Frontier logo]()
$304
This Orbitz deal was found by Cheapflights users on 6/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/94:48 pm
PHX
- STL
1 stop24h 35m
Frontier
Mon 7/137:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/10![Frontier logo]()
$308
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.
Fri 7/109:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Fri 7/174:57 pm
STL
- PHX
1 stop28h 40m
Frontier
Deal found 6/12![Frontier logo]()
$306
This Frontier deal was found by Cheapflights users on 6/10. 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 7/106:40 am
PHX
- STL
1 stop10h 43m
Frontier
Thu 7/163:41 pm
STL
- PHX
1 stop9h 18m
Frontier
Deal found 6/10![Frontier logo]()
$309
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.
Mon 7/139:58 pm
PHX
- STL
1 stop18h 07m
Frontier
Fri 7/174:57 pm
STL
- PHX
1 stop28h 40m
Frontier
Deal found 6/12![Frontier logo]()
$307
This Expedia deal was found by Cheapflights users on 6/10. 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.
Fri 7/2411:23 pm
PHX
- STL
1 stop7h 34m
Frontier
Sun 7/267:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/10![Frontier logo]()
$310
This American Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 7/298:39 am
PHX
- STL
Nonstop3h 14m
American Airlines
Tue 8/48:01 am
STL
- PHX
Nonstop3h 16m
American Airlines
Deal found 6/10![American Airlines logo]()
$313
One-way flights from Sky Harbor Intl to St. CharlesSearch for one-way flight options from Sky Harbor Intl to St. Charles. Find affordable one-way fares based on user searches. Data last updated June 13, 2026.
Search for one-way flight options from Sky Harbor Intl to St. Charles. Find affordable one-way fares based on user searches. Data last updated June 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/8. 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 7/299:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/8![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 7/72:04 pm
PHX
- STL
1 stop26h 01m
Frontier
Deal found 6/9![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 7/310:32 pm
PHX
- STL
1 stop13h 34m
Frontier
Deal found 6/9![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 7/12:00 pm
PHX
- STL
1 stop19h 18m
Frontier
Deal found 6/10![Frontier logo]()
$94
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.
Thu 7/97:45 am
PHX
- STL
1 stop8h 30m
Frontier
Deal found 6/12![Frontier logo]()
$103
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.
Sat 8/87:45 am
PHX
- STL
1 stop8h 30m
Frontier
Deal found 6/12![Frontier logo]()
$107
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 8/1111:17 am
PHX
- STL
1 stop6h 06m
Frontier
Deal found 6/11![Frontier logo]()
$112
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 8/178:40 am
PHX
- STL
1 stop8h 43m
Frontier
Deal found 6/11![Frontier logo]()
$119
This Frontier deal was found by Cheapflights users on 6/9. 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 9/86:24 am
PHX
- STL
1 stop6h 24m
Frontier
Deal found 6/9![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 6/9. 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.
Thu 8/66:24 am
PHX
- STL
1 stop6h 32m
Frontier
Deal found 6/9![Frontier logo]()
$121
Find flight deals from Sky Harbor Intl to St. Charles
Keep the following information in mind while searching for Sky Harbor Intl to St. Charles flight deals. Data was last updated June 13, 2026.
Round-trip from | $303 (Kiwi.com) |
|---|---|
One-way from | $86 (Kiwi.com) |
Popular in | March |
Cheapest in | October |
Average price | $425 |
Cheapflights Fare Finder
Customize your flight search to find flights from Sky Harbor Intl 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 June 13, 2026.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to St. Charles that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 8/4
5:40 pm-10:35 pm
Nonstop2h 55m
Lambert-St Louis
Sun 8/9
8:30 am-9:40 am
Nonstop3h 10m
$352
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 7/23
8:55 pm-1:55 am
Nonstop3h 00m
Lambert-St Louis
Mon 7/27
7:20 am-8:35 am
Nonstop3h 15m
$377
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 7/14
4:50 pm-11:45 pm
1 stop4h 55m
Lambert-St Louis
Tue 7/28
1:40 pm-2:50 pm
Nonstop3h 10m
$383
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 7/22
1:45 pm-6:40 pm
Nonstop2h 55m
Lambert-St Louis
Tue 7/28
5:35 am-10:15 am
1 stop6h 40m
$387
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 8/13
6:55 pm-11:50 pm
Nonstop2h 55m
Lambert-St Louis
Sun 8/16
9:45 am-12:40 pm
1 stop4h 55m
$422
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Mon 8/3
6:02 am-11:26 pm
2 stops15h 24m
Lambert-St Louis
Wed 8/5
8:00 am-12:06 pm
1 stop6h 06m
$440
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 6/27
8:05 pm-1:00 am
Nonstop2h 55m
Lambert-St Louis
Tue 6/30
5:35 am-10:15 am
1 stop6h 40m
$445
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 9/5
9:23 am-10:00 pm
2 stops10h 37m
Lambert-St Louis
Mon 9/7
5:30 pm-10:22 pm
1 stop6h 52m
$467
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/16
10:50 am-5:45 pm
1 stop4h 55m
Lambert-St Louis
Sat 6/20
8:45 pm-9:55 pm
Nonstop3h 10m
$481
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/23
6:35 pm-11:30 pm
Nonstop2h 55m
Lambert-St Louis
Wed 6/24
11:20 am-3:35 pm
1 stop6h 15m
$485
Showing 1-10 of 22 resultsSorted by cheapest first
Best time to book a flight from Sky Harbor Intl to St. Charles
Have a flexible travel schedule? Discover the best time to fly to St. Charles from Sky Harbor Intl with our price prediction graph.
PHX-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 Phoenix Sky Harbor Intl Airport to St. Charles
PHX-CH5
PHX-STL
What is the cheapest time of day to fly from PHX to CH5?
Find hourly flight availability from Sky Harbor Intl 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 June 13, 2026.
When flying from Phoenix Sky Harbor Intl Airport to St. Charles, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 15% versus a flight in the evening.
Weekly flight availability from Phoenix Sky Harbor Intl Airport to St. Charles
Explore weekly flight availability from Sky Harbor Intl 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 June 13, 2026.
The most flights from PHX to CH5 are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Phoenix Sky Harbor Intl Airport to St. Charles?
What is the cheapest day to fly from Phoenix Sky Harbor Intl Airport to St. Charles?
Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to St. Charles. Price data was last updated on June 13, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Charles flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 June 13, 2026.
Read reviews from past customers who have flown Southwest,American Airlines, andFrontier from Phoenix Sky Harbor Intl Airport to St. Charles. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
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 Sky Harbor Intl to St. Charles. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Sky Harbor Intl
Popular flights
Top destinations
Alternative routes for Sky Harbor Intl to St. Charles
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Charles by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Sky Harbor Intl to St. Charles by cabin class
Find flights from Sky Harbor Intl to St. Charles, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Sky Harbor Intl and St. Charles flights
Browse other Sky Harbor Intl and St. Charles flight options. Last updated on June 13, 2026.
Other flights from Sky Harbor Intl
Browse through other flights departing from Sky Harbor Intl. Flights are based on user searches made on Cheapflights and were last updated on June 13, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Sky Harbor Intl to St. Charles flights
Consider these flights traveling from Sky Harbor Intl to St. Charles.
Top 4 airlines flying from Sky Harbor Intl to St. Charles
Discover the top 4 airlines that operate flights from Sky Harbor Intl 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 June 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$199 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$407 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$261 | Average$405 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$299 | Average$353 | FlexibilityNo cancel fee | On-time69% |