$83+ Cheap flights from Sky Harbor Intl (PHX) to St. Charles, MO
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Oct 15 — Oct 221
Round-trip
1 adult, Economy
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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 January or November, booked 25 days in advance, depart on a Saturday or Friday 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 September 15, 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 September 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Fri 10/238:51 pm -
1 stop20h 06m
Sun 10/254:30 pm -
2 stops26h 47m
Deal found 9/11![Frontier logo]()
$256
This Expedia deal was found by Cheapflights users on 9/10. 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.
Thu 10/85:01 am -
1 stop9h 57m
Sat 10/107:42 pm -
1 stop6h 06m
Deal found 9/10![Frontier logo]()
$276
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 11/117:15 am -
2 stops9h 25m
Mon 12/147:49 pm -
1 stop17h 16m
Deal found 9/14![Frontier logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 10/125:01 am -
1 stop9h 57m
Mon 10/195:53 pm -
1 stop7h 06m
Deal found 9/12![Frontier logo]()
$278
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 11/47:56 pm -
Nonstop3h 00m
Sat 11/72:28 pm -
Nonstop3h 27m
Deal found 9/15![American Airlines logo]()
$279
This CheapOair deal was found by Cheapflights users on 9/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:01 am -
1 stop9h 57m
Mon 10/198:00 pm -
1 stop5h 48m
Deal found 9/11![Frontier logo]()
$280
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:01 am -
1 stop5h 18m
Fri 11/67:59 pm -
1 stop21h 18m
Deal found 9/10![Frontier logo]()
$281
This Expedia deal was found by Cheapflights users on 9/10. 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 10/1010:12 pm -
1 stop23h 01m
Wed 10/144:19 pm -
1 stop5h 27m
Deal found 9/10![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/57:24 pm -
1 stop14h 08m
Sat 10/107:42 pm -
1 stop6h 06m
Deal found 9/11![Frontier logo]()
$283
This FlightHub deal was found by Cheapflights users on 9/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1310:09 am -
1 stop8h 05m
Mon 11/161:28 pm -
1 stop5h 59m
Deal found 9/12![Frontier logo]()
$284
This Southwest deal was found by Cheapflights users on 9/15. 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.
Wed 11/412:00 pm -
1 stop4h 25m
Sat 11/72:55 pm -
Nonstop3h 20m
Deal found 9/15![Southwest logo]()
$285
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 September 15, 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 September 15, 2026.
This Frontier deal was found by Cheapflights users on 9/10. 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.
Mon 10/125:01 am -
1 stop9h 57m
Thu 10/155:53 pm -
1 stop7h 06m
Deal found 9/10![Frontier logo]()
$298
This Delta deal was found by Cheapflights users on 9/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:27 pm -
1 stop5h 17m
Tue 10/137:00 pm -
1 stop5h 43m
Deal found 9/14![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 9/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/265:10 am -
Nonstop2h 50m
Mon 10/265:50 pm -
Nonstop3h 20m
Deal found 9/13![Southwest logo]()
$363
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/108:00 am -
1 stop9h 11m
Mon 12/146:30 am -
2 stops9h 57m
Deal found 9/15![United Airlines logo]()
$434
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:38 am -
2 stops14h 21m
Mon 10/267:02 am -
2 stops13h 40m
Deal found 9/10![Alaska Airlines logo]()
$530
This Southwest deal was found by Cheapflights users on 9/10. 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.
Thu 10/88:25 pm -
Nonstop2h 55m
Sat 10/108:25 am -
1 stop5h 35m
Deal found 9/10![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 9/10. 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.
Thu 10/224:30 pm -
1 stop5h 20m
Mon 10/265:10 am -
1 stop6h 00m
Deal found 9/10![Southwest logo]()
$417
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:38 am -
2 stops14h 21m
Mon 10/267:02 am -
2 stops13h 40m
Deal found 9/11![Alaska Airlines logo]()
$530
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/277:00 am -
2 stops10h 05m
Tue 12/18:40 am -
2 stops13h 47m
Deal found 9/15![United Airlines logo]()
$532
This Southwest deal was found by Cheapflights users on 9/12. 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.
Tue 10/276:35 pm -
Nonstop2h 55m
Tue 11/38:25 am -
1 stop4h 50m
Deal found 9/12![Southwest logo]()
$451
This Southwest deal was found by Cheapflights users on 9/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:20 am -
1 stop6h 25m
Sun 11/88:25 am -
1 stop6h 20m
Deal found 9/14![Southwest logo]()
$454
This Southwest deal was found by Cheapflights users on 9/11. 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.
Thu 10/296:30 pm -
Nonstop2h 55m
Mon 11/28:30 am -
1 stop6h 05m
Deal found 9/11![Southwest logo]()
$475
Last-minute flights from Sky Harbor Intl to St. CharlesDiscover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated September 15, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated September 15, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 9/298:39 pm -
1 stop12h 53m
Mon 10/58:10 pm -
1 stop13h 50m
Deal found 9/11![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/36:25 am -
1 stop10h 52m
Tue 10/612:17 pm -
1 stop8h 46m
Deal found 9/11![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/57:24 pm -
1 stop14h 08m
Sat 10/107:42 pm -
1 stop6h 06m
Deal found 9/11![Frontier logo]()
$283
This CheapOair deal was found by Cheapflights users on 9/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:01 am -
1 stop9h 57m
Mon 10/198:00 pm -
1 stop5h 48m
Deal found 9/11![Frontier logo]()
$280
This CheapOair deal was found by Cheapflights users on 9/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:01 am -
1 stop9h 57m
Sat 10/107:42 pm -
1 stop6h 06m
Deal found 9/15![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 10/125:01 am -
1 stop9h 57m
Mon 10/195:53 pm -
1 stop7h 06m
Deal found 9/12![Frontier logo]()
$278
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/138:51 pm -
1 stop16h 33m
Mon 10/198:00 pm -
1 stop14h 10m
Deal found 9/11![Frontier logo]()
$279
This Southwest deal was found by Cheapflights users on 9/15. 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.
Wed 10/146:35 pm -
Nonstop2h 55m
Wed 10/215:20 pm -
1 stop5h 05m
Deal found 9/15![Southwest logo]()
$289
This Southwest deal was found by Cheapflights users on 9/15. 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.
Sat 10/176:00 am -
Nonstop2h 50m
Sat 10/248:25 am -
1 stop4h 45m
Deal found 9/15![Southwest logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Fri 10/238:51 pm -
1 stop20h 06m
Sun 10/254:30 pm -
2 stops26h 47m
Deal found 9/11![Frontier logo]()
$256
This Orbitz deal was found by Cheapflights users on 9/15. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/308:59 pm -
1 stop20h 15m
Mon 11/212:14 pm -
1 stop12h 41m
Deal found 9/15![Frontier logo]()
$291
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 September 15, 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 September 15, 2026.
This Priceline deal was found by Cheapflights users on 9/12. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/117:15 am -
1 stop7h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Frontier logo]()
$83
This CheapOair deal was found by Cheapflights users on 9/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/510:59 am -
1 stop6h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Frontier logo]()
$84
This Super.com deal was found by Cheapflights users on 9/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/109:59 pm -
1 stop16h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 9/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:51 pm -
1 stop20h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 11/123:46 pm -
1 stop26h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/137:15 am -
2 stops32h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Wed 10/216:15 am -
2 stops9h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 11/173:46 pm -
2 stops24h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 9/15. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:15 am -
1 stop7h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/612:25 pm -
2 stops22h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$122
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 September 15, 2026.
Round-trip from | $256 (Kiwi.com) |
|---|---|
One-way from | $83 (Priceline) |
Popular in | June |
Cheapest in | January |
Average price | $372 |
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 7,457,451 searches. Data last updated September 15, 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
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Tue 11/17
9:59 pm-5:40 pm
2 stops18h 41m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$115
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Wed 10/7
6:00 am-2:10 pm
1 stop6h 10m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$150
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Sat 10/31
6:55 am-5:05 pm
2 stops8h 10m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$155
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Sat 11/14
8:35 am-4:20 pm
2 stops6h 45m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$155
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Thu 10/8
8:25 pm-1:20 am
Nonstop2h 55m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$160
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Mon 11/16
6:45 am-1:20 pm
1 stop5h 35m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$170
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Tue 11/17
7:56 pm-11:56 pm
Nonstop3h 00m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$185
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Wed 10/14
6:33 am-6:43 pm
2 stops10h 10m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$200
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Sun 10/11
6:00 am-4:58 pm
2 stops32h 58m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$212
Quickest round-trip
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Sat 12/5
6:05 pm-9:55 pm
Nonstop2h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$223
Showing 1-10 of 24 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 September 15, 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 in the afternoon, which can drop the price by up to 16% versus a flight at noon.
How much does it cost to fly round-trip from Phoenix Sky Harbor Intl Airport to St. Charles?
Airfare is below average for this route at the moment.
Phoenix Sky Harbor Intl Airport to St. Charles flights typically cost between $337 and $425 in October.The cheapest round-trip price found within the last 5 days was $256 on Frontier (Oct 23-Oct 25).
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 September 12, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Charles flight should consider departing on Saturday evenings 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 September 15, 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.
Boarding
8.1
Crew
8.6
Overall
8.0
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Crew
8.6
Overall
8.0
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Crew
8.6
Overall
8.0
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Crew
8.6
Overall
8.0
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
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.
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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 7,457,451 searches. Data last updated September 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$243 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$446 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$290 | Average$425 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$299 | Average$367 | FlexibilityNo cancel fee | On-time69% |