$82+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Apr 16 — Apr 231
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 December, booked 25 days in advance, depart on a Friday or Tuesday 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 March 17, 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 March 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:51 pm
PHX
- STL
1 stop22h 30m
Frontier
Mon 4/208:17 pm
STL
- PHX
1 stop29h 25m
Frontier
Deal found 3/16![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/109:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Sun 5/34:59 pm
STL
- PHX
1 stop8h 30m
Frontier
Deal found 3/12![Frontier logo]()
$209
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Mon 4/138:19 pm
STL
- PHX
1 stop5h 23m
Frontier
Deal found 3/13![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/39:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Tue 4/711:21 am
STL
- PHX
2 stops25h 15m
Frontier
Deal found 3/12![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 4/76:52 pm
PHX
- STL
1 stop12h 56m
Frontier
Sat 4/188:17 pm
STL
- PHX
1 stop5h 25m
Frontier
Deal found 3/16![Frontier logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Thu 4/2312:30 am
PHX
- STL
1 stop20h 49m
Frontier
Wed 4/294:59 pm
STL
- PHX
1 stop8h 11m
Frontier
Deal found 3/15![Frontier logo]()
$217
This CheapOair deal was found by Cheapflights users on 3/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:24 pm
PHX
- STL
1 stop19h 57m
Frontier
Sun 5/39:55 pm
STL
- PHX
1 stop24h 46m
Frontier
Deal found 3/13![Frontier logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/27:06 pm
PHX
- STL
1 stop12h 42m
Frontier
Fri 4/38:16 pm
STL
- PHX
2 stops17h 07m
Frontier
Deal found 3/13![Frontier logo]()
$223
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
Thu 4/235:03 pm
PHX
- STL
2 stops48h 29m
Frontier
Fri 5/88:08 pm
STL
- PHX
1 stop5h 23m
Frontier
Deal found 3/14![Frontier logo]()
$226
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 4/2710:29 pm
PHX
- STL
1 stop30h 21m
Frontier
Mon 5/48:17 pm
STL
- PHX
1 stop13h 44m
Frontier
Deal found 3/16![Frontier logo]()
$227
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 March 17, 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 March 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/279:24 pm
PHX
- STL
1 stop10h 25m
Frontier
Tue 3/3112:14 pm
STL
- PHX
2 stops25h 31m
Frontier
Deal found 3/16![Frontier logo]()
$390
This Southwest deal was found by Cheapflights users on 3/14. 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.
Tue 4/218:55 am
PHX
- STL
Nonstop2h 55m
Southwest
Fri 5/156:00 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/14![Southwest logo]()
$395
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Tue 6/237:07 am
PHX
- STL
1 stop6h 39m
United Airlines
Thu 7/165:33 pm
STL
- PHX
1 stop7h 51m
United Airlines
Deal found 3/12![United Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 3/13. 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.
Sat 5/306:40 am
PHX
- STL
Nonstop2h 50m
Southwest
Mon 6/19:40 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/13![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/294:10 pm
PHX
- STL
Nonstop2h 55m
Southwest
Wed 6/109:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 3/16![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 3/15. 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 7/181:50 pm
PHX
- STL
2 stops7h 20m
Southwest
Sat 7/254:45 pm
STL
- PHX
1 stop6h 05m
Southwest
Deal found 3/15![Southwest logo]()
$400
This Southwest deal was found by Cheapflights users on 3/12. 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.
Wed 4/1511:10 am
PHX
- STL
1 stop4h 45m
Southwest
Sun 4/199:55 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/12![Southwest logo]()
$401
This Southwest deal was found by Cheapflights users on 3/12. 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 4/167:40 pm
PHX
- STL
Nonstop2h 50m
Southwest
Sun 4/199:55 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/12![Southwest logo]()
$406
This Southwest deal was found by Cheapflights users on 3/15. 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.
Fri 5/17:40 pm
PHX
- STL
Nonstop2h 50m
Southwest
Mon 5/46:05 am
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/15![Southwest logo]()
$415
Last-minute flights from Sky Harbor Intl to St. CharlesDiscover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated March 17, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated March 17, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/29:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Sun 4/510:12 pm
STL
- PHX
1 stop14h 01m
Frontier
Deal found 3/12![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/27:06 pm
PHX
- STL
1 stop12h 42m
Frontier
Fri 4/38:16 pm
STL
- PHX
2 stops17h 07m
Frontier
Deal found 3/13![Frontier logo]()
$223
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Mon 4/138:19 pm
STL
- PHX
1 stop5h 23m
Frontier
Deal found 3/13![Frontier logo]()
$210
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Thu 4/168:06 pm
STL
- PHX
1 stop5h 36m
Frontier
Deal found 3/14![Frontier logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/109:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Sun 5/34:59 pm
STL
- PHX
1 stop8h 30m
Frontier
Deal found 3/12![Frontier logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 4/1412:58 pm
PHX
- STL
1 stop15h 52m
Frontier
Tue 4/214:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Deal found 3/15![Frontier logo]()
$231
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 4/2010:29 pm
PHX
- STL
1 stop30h 21m
Frontier
Sat 4/258:17 pm
STL
- PHX
1 stop13h 19m
Frontier
Deal found 3/16![Frontier logo]()
$234
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Thu 4/2312:30 am
PHX
- STL
1 stop20h 49m
Frontier
Wed 4/294:59 pm
STL
- PHX
1 stop8h 11m
Frontier
Deal found 3/15![Frontier logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
Thu 4/235:03 pm
PHX
- STL
2 stops48h 29m
Frontier
Fri 5/88:08 pm
STL
- PHX
1 stop5h 23m
Frontier
Deal found 3/14![Frontier logo]()
$226
This CheapOair deal was found by Cheapflights users on 3/16. 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 4/309:24 pm
PHX
- STL
1 stop19h 57m
Frontier
Sun 5/311:28 am
STL
- PHX
1 stop11h 56m
Frontier
Deal found 3/16![Frontier logo]()
$221
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 March 17, 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 March 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/189:52 am
PHX
- STL
1 stop7h 40m
Frontier
Deal found 3/12![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:15 am
PHX
- STL
1 stop12h 08m
Frontier
Deal found 3/13![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/97:06 pm
PHX
- STL
1 stop12h 42m
Frontier
Deal found 3/12![Frontier logo]()
$101
This Super.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/811:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 3/16![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1011:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 3/13![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 3/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/117:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Deal found 3/12![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 3/16. 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 4/14:27 pm
PHX
- STL
1 stop26h 50m
Frontier
Deal found 3/16![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Fri 5/295:15 am
PHX
- STL
1 stop12h 08m
Frontier
Deal found 3/15![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:52 am
PHX
- STL
1 stop8h 29m
Frontier
Deal found 3/16![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 4/156:51 pm
PHX
- STL
1 stop22h 30m
Frontier
Deal found 3/15![Frontier logo]()
$112
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 March 17, 2026.
Round-trip from | $209 (Kiwi.com) |
|---|---|
One-way from | $82 (Kiwi.com) |
Popular in | April |
Cheapest in | January |
Average price | $406 |
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 March 17, 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 - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 3/27
9:24 pm-9:49 am
1 stop10h 25m
Lambert-St Louis
Tue 3/31
12:14 pm-11:45 am
2 stops25h 31m
$390
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 4/21
8:55 am-1:50 pm
Nonstop2h 55m
Lambert-St Louis
Fri 5/15
6:00 pm-7:25 pm
Nonstop3h 25m
$395
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 5/30
6:40 am-11:30 am
Nonstop2h 50m
Lambert-St Louis
Mon 6/1
9:40 pm-11:05 pm
Nonstop3h 25m
$395
Quickest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 5/29
4:10 pm-9:05 pm
Nonstop2h 55m
Lambert-St Louis
Wed 6/10
9:15 pm-10:25 pm
Nonstop3h 10m
$395
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 7/18
1:50 pm-11:10 pm
2 stops7h 20m
Lambert-St Louis
Sat 7/25
4:45 pm-8:50 pm
1 stop6h 05m
$400
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 4/15
11:10 am-5:55 pm
1 stop4h 45m
Lambert-St Louis
Sun 4/19
9:55 pm-11:20 pm
Nonstop3h 25m
$401
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/23
7:07 am-3:46 pm
1 stop6h 39m
Lambert-St Louis
Thu 7/16
5:33 pm-11:24 pm
1 stop7h 51m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 4/16
7:40 pm-12:30 am
Nonstop2h 50m
Lambert-St Louis
Sun 4/19
9:55 pm-11:20 pm
Nonstop3h 25m
$406
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 5/1
7:40 pm-12:30 am
Nonstop2h 50m
Lambert-St Louis
Mon 5/4
6:05 am-7:30 am
Nonstop3h 25m
$415
Cheapest one-way
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 5/22
12:20 am-12:21 am
1 stop22h 01m
$147
Showing 1-10 of 19 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
How far ahead should I book a flight from Phoenix Sky Harbor Intl Airport to St. Charles?
Use this chart to determine the optimal time to book a round-trip flight from Sky Harbor Intl to St. Charles. Price data was last updated on March 13, 2026.
The price you pay for your flight from Phoenix Sky Harbor Intl Airport to St. Charles may vary depending on when you book. For the best chance of a lower fare, look to book 25 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Phoenix Sky Harbor Intl Airport to St. Charles?
Currently, January is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Charles (average of $93). Flying from Phoenix Sky Harbor Intl Airport to St. Charles in April is currently the most expensive (average of $268). 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 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 March 17, 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 7% versus a flight in the evening.
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 March 14, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Charles flight should consider departing on Monday at noon 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.
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 March 17, 2026.
The most flights from PHX to CH5 are scheduled on a Monday (12 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 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 March 17, 2026.
Read reviews from past customers who have flown Southwest,Delta, andAmerican Airlines 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
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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 5 airlines flying from Sky Harbor Intl to St. Charles
Discover the top 5 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 March 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$450 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$257 | Average$393 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$299 | Average$367 | FlexibilityNo cancel fee | On-time69% |