$80+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
May 31 — Jun 71
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 January or October, 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 May 1, 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 May 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Tue 8/116:53 pm
PHX
- STL
1 stop22h 30m
Frontier
Tue 8/188:08 pm
STL
- PHX
1 stop21h 16m
Frontier
Deal found 4/29![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Sat 6/611:50 am
PHX
- STL
1 stop24h 41m
Frontier
Tue 6/98:08 pm
STL
- PHX
1 stop16h 08m
Frontier
Deal found 4/27![Frontier logo]()
$183
This Expedia deal was found by Cheapflights users on 4/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:40 am
PHX
- STL
1 stop10h 31m
Frontier
Tue 6/28:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 4/27![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Tue 6/211:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Tue 6/98:08 pm
STL
- PHX
1 stop16h 08m
Frontier
Deal found 4/27![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 6/96:53 pm
PHX
- STL
1 stop22h 30m
Frontier
Fri 6/127:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 4/30![Frontier logo]()
$192
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Sun 5/1710:27 pm
PHX
- STL
1 stop19h 56m
Frontier
Wed 5/206:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 4/28![Frontier logo]()
$196
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2610:27 pm
PHX
- STL
1 stop17h 39m
Frontier
Sat 6/137:38 pm
STL
- PHX
1 stop5h 51m
Frontier
Deal found 4/29![Frontier logo]()
$204
This Expedia deal was found by Cheapflights users on 4/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/137:40 am
PHX
- STL
1 stop8h 26m
Frontier
Wed 6/36:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 4/27![Frontier logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Sat 6/611:50 am
PHX
- STL
1 stop24h 41m
Frontier
Wed 6/107:03 pm
STL
- PHX
1 stop5h 57m
Frontier
Deal found 4/27![Frontier logo]()
$208
This Expedia deal was found by Cheapflights users on 4/28. 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.
Mon 6/17:40 am
PHX
- STL
1 stop10h 31m
Frontier
Fri 6/59:06 pm
STL
- PHX
1 stop28h 18m
Frontier
Deal found 4/28![Frontier logo]()
$210
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:40 am
PHX
- STL
1 stop10h 31m
Frontier
Sun 5/319:06 pm
STL
- PHX
1 stop28h 18m
Frontier
Deal found 4/29![Frontier logo]()
$215
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:40 am
PHX
- STL
1 stop10h 43m
Frontier
Sun 5/1712:36 pm
STL
- PHX
1 stop22h 11m
Frontier
Deal found 4/30![Frontier logo]()
$216
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 May 1, 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 May 1, 2026.
This Southwest deal was found by Cheapflights users on 4/30. 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 6/235:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 6/306:10 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 4/30![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 4/30. 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 6/29:08 am
PHX
- STL
2 stops10h 13m
United Airlines
Wed 6/35:10 am
STL
- PHX
1 stop5h 50m
United Airlines
Deal found 4/30![United Airlines logo]()
$446
This Southwest deal was found by Cheapflights users on 4/26. 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 5/265:35 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 6/25:35 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 4/26![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 4/28. 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 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
Wed 7/12:10 pm
STL
- PHX
1 stop5h 50m
Southwest
Deal found 4/28![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:10 pm
PHX
- STL
Nonstop2h 55m
Southwest
Tue 6/94:00 pm
STL
- PHX
1 stop6h 35m
Southwest
Deal found 4/28![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 4/27. 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.
Sat 10/32:10 pm
PHX
- STL
1 stop5h 10m
Southwest
Mon 10/59:45 pm
STL
- PHX
Nonstop3h 20m
Southwest
Deal found 4/27![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 4/30. 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 6/195:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Sun 6/216:00 am
STL
- PHX
1 stop5h 00m
Southwest
Deal found 4/30![Southwest logo]()
$425
This Southwest deal was found by Cheapflights users on 4/26. 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 5/124:20 pm
PHX
- STL
Nonstop2h 50m
Southwest
Wed 5/205:45 am
STL
- PHX
1 stop5h 20m
Southwest
Deal found 4/26![Southwest logo]()
$425
This Southwest deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/315:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Sun 8/29:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 4/30![Southwest logo]()
$435
This Southwest deal was found by Cheapflights users on 4/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/227:40 pm
PHX
- STL
Nonstop2h 50m
Southwest
Sun 5/243:25 pm
STL
- PHX
1 stop5h 55m
Southwest
Deal found 4/29![Southwest logo]()
$450
Last-minute flights from Sky Harbor Intl to St. CharlesDiscover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated May 1, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to St. Charles. Data last updated May 1, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 4/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/127:40 am
PHX
- STL
1 stop8h 26m
Frontier
Tue 5/196:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 4/29![Frontier logo]()
$225
This Expedia deal was found by Cheapflights users on 4/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/137:40 am
PHX
- STL
1 stop8h 26m
Frontier
Wed 6/36:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 4/27![Frontier logo]()
$205
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:40 am
PHX
- STL
1 stop10h 43m
Frontier
Sun 5/1712:36 pm
STL
- PHX
1 stop22h 11m
Frontier
Deal found 4/30![Frontier logo]()
$216
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Sun 5/1710:27 pm
PHX
- STL
1 stop19h 56m
Frontier
Wed 5/206:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 4/28![Frontier logo]()
$196
This Expedia deal was found by Cheapflights users on 4/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:40 am
PHX
- STL
1 stop10h 31m
Frontier
Tue 6/28:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 4/27![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Mon 5/2510:27 pm
PHX
- STL
2 stops42h 56m
Frontier
Mon 6/18:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 4/27![Frontier logo]()
$228
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2610:27 pm
PHX
- STL
1 stop17h 39m
Frontier
Sat 6/137:38 pm
STL
- PHX
1 stop5h 51m
Frontier
Deal found 4/29![Frontier logo]()
$204
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 5/277:40 am
PHX
- STL
1 stop8h 26m
Frontier
Wed 6/36:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 4/28![Frontier logo]()
$210
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/277:40 am
PHX
- STL
1 stop8h 26m
Frontier
Sun 5/318:08 pm
STL
- PHX
1 stop13h 36m
Frontier
Deal found 4/29![Frontier logo]()
$220
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:40 am
PHX
- STL
1 stop10h 31m
Frontier
Sun 5/319:06 pm
STL
- PHX
1 stop28h 18m
Frontier
Deal found 4/29![Frontier logo]()
$215
This Frontier deal was found by Cheapflights users on 4/28. 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.
Sun 5/316:00 am
PHX
- STL
1 stop6h 31m
Frontier
Sat 7/258:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Deal found 4/28![Frontier logo]()
$224
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 May 1, 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 May 1, 2026.
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 5/207:40 am
PHX
- STL
1 stop8h 26m
Frontier
Deal found 4/28![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 4/26. 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 5/2310:27 pm
PHX
- STL
1 stop19h 44m
Frontier
Deal found 4/26![Frontier logo]()
$85
This Priceline deal was found by Cheapflights users on 4/26. 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.
Sun 5/247:40 am
PHX
- STL
1 stop10h 31m
Frontier
Deal found 4/26![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 5/2711:30 pm
PHX
- STL
1 stop16h 03m
Frontier
Deal found 4/26![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/267:40 pm
PHX
- STL
2 stops21h 43m
Frontier
Deal found 4/28![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 6/276:24 am
PHX
- STL
1 stop10h 10m
Frontier
Deal found 4/30![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 6/234:36 pm
PHX
- STL
1 stop23h 42m
Frontier
Deal found 4/30![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/137:40 am
PHX
- STL
1 stop8h 26m
Frontier
Deal found 4/29![Frontier logo]()
$99
This Priceline deal was found by Cheapflights users on 4/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1211:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 4/28![Frontier logo]()
$100
This Super.com deal was found by Cheapflights users on 4/29. 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.
Sun 5/316:00 am
PHX
- STL
1 stop6h 31m
Frontier
Deal found 4/29![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 4/30. 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 6/1611:21 am
PHX
- STL
1 stop6h 02m
Frontier
Deal found 4/30![Frontier logo]()
$105
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 May 1, 2026.
Round-trip from | $180 (Kiwi.com) |
|---|---|
One-way from | $80 (Frontier) |
Popular in | April |
Cheapest in | January |
Average price | $384 |
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 May 1, 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 6/23
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Tue 6/30
6:10 am-7:20 am
Nonstop3h 10m
$375
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 5/26
5:35 am-10:25 am
Nonstop2h 50m
Lambert-St Louis
Tue 6/2
5:35 pm-7:00 pm
Nonstop3h 25m
$375
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 6/27
8:05 pm-1:00 am
Nonstop2h 55m
Lambert-St Louis
Wed 7/1
2:10 pm-6:00 pm
1 stop5h 50m
$385
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Mon 6/1
4:10 pm-9:05 pm
Nonstop2h 55m
Lambert-St Louis
Tue 6/9
4:00 pm-8:35 pm
1 stop6h 35m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 10/3
2:10 pm-9:20 pm
1 stop5h 10m
Lambert-St Louis
Mon 10/5
9:45 pm-11:05 pm
Nonstop3h 20m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 6/19
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Sun 6/21
6:00 am-9:00 am
1 stop5h 00m
$425
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 5/12
4:20 pm-9:10 pm
Nonstop2h 50m
Lambert-St Louis
Wed 5/20
5:45 am-9:05 am
1 stop5h 20m
$425
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 7/31
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Sun 8/2
9:45 pm-10:55 pm
Nonstop3h 10m
$435
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/2
9:08 am-9:21 pm
2 stops10h 13m
Lambert-St Louis
Wed 6/3
5:10 am-9:00 am
1 stop5h 50m
$446
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 5/22
7:40 pm-12:30 am
Nonstop2h 50m
Lambert-St Louis
Sun 5/24
3:25 pm-7:20 pm
1 stop5h 55m
$450
Showing 1-10 of 21 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 May 1, 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 12% 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 April 25, 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 May 1, 2026.
The most flights from PHX to CH5 are scheduled on a Tuesday (10 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from Phoenix Sky Harbor Intl Airport to St. Charles?
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 May 1, 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.
Overall
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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 May 1, 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 May 1, 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 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 May 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$99 | Average$209 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$228 | Average$428 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$367 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$257 | Average$395 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$299 | Average$367 | FlexibilityNo cancel fee | On-time69% |