$59+ Cheap flights from Sky Harbor Intl (PHX) to St. Louis (STL)
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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Mar 13 — Mar 201
1 adult, Economy
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Find cheap flights from Sky Harbor Intl to St. Louis 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 Lambert-St Louis 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. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Sky Harbor Intl to St. LouisExplore the most affordable flight options available from Sky Harbor Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.
Explore the most affordable flight options available from Sky Harbor Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.
This Frontier deal was found by Cheapflights users on 2/9. 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.
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/9![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Sat 5/26:50 am
PHX
- STL
1 stop10h 22m
Frontier
Mon 5/48:12 pm
STL
- PHX
1 stop17h 34m
Frontier
Deal found 2/10![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Sat 4/117:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Mon 4/138:16 pm
STL
- PHX
1 stop17h 30m
Frontier
Deal found 2/8![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 4/76:52 pm
PHX
- STL
1 stop12h 56m
Frontier
Mon 4/138:16 pm
STL
- PHX
1 stop23h 27m
Frontier
Deal found 2/10![Frontier logo]()
$147
This Frontier deal was found by Cheapflights users on 2/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:00 am
PHX
- STL
1 stop6h 09m
Frontier
Fri 2/279:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/8![Frontier logo]()
$154
This Trip.com deal was found by Cheapflights users on 2/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/84:27 pm
PHX
- STL
1 stop17h 52m
Frontier
Sat 4/111:06 pm
STL
- PHX
Nonstop3h 35m
Frontier
Deal found 2/9![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 3/106:45 pm
PHX
- STL
1 stop13h 04m
Frontier
Tue 3/178:06 pm
STL
- PHX
1 stop26h 12m
Frontier
Deal found 2/10![Frontier logo]()
$161
This Expedia deal was found by Cheapflights users on 2/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/155:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Thu 3/1910:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/11![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 2/274:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sat 3/78:12 pm
STL
- PHX
1 stop5h 39m
Frontier
Deal found 2/9![Frontier logo]()
$164
Best flights from Sky Harbor Intl to St. LouisDiscover carefully curated flight deals from Sky Harbor Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 11, 2026.
Discover carefully curated flight deals from Sky Harbor Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Sat 5/26:50 am
PHX
- STL
1 stop10h 22m
Frontier
Mon 5/48:12 pm
STL
- PHX
1 stop17h 34m
Frontier
Deal found 2/10![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 3/139:24 pm
PHX
- STL
1 stop10h 25m
Multiple Airlines
Tue 3/178:06 pm
STL
- PHX
2 stops22h 02m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 2/8. 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.
Sat 4/186:40 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 4/212:05 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 2/8![Southwest logo]()
$287
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier 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
Mon 4/138:16 pm
STL
- PHX
1 stop5h 31m
Frontier
Deal found 2/11![Frontier logo]()
$184
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:52 am
PHX
- STL
1 stop8h 20m
Frontier
Sun 5/38:12 pm
STL
- PHX
1 stop5h 35m
Frontier
Deal found 2/11![Frontier logo]()
$211
This Frontier deal was found by Cheapflights users on 2/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/234:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Thu 2/2610:11 pm
STL
- PHX
1 stop11h 39m
Frontier
Deal found 2/8![Frontier logo]()
$228
This Southwest deal was found by Cheapflights users on 2/8. 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 6/305:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Sat 7/112:35 pm
STL
- PHX
1 stop6h 05m
Southwest
Deal found 2/8![Southwest logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 4/179:24 pm
PHX
- STL
2 stops15h 57m
Frontier
Sun 4/1911:21 am
STL
- PHX
1 stop12h 02m
Frontier
Deal found 2/10![Frontier logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 4/39:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Sun 4/510:12 pm
STL
- PHX
1 stop13h 36m
Frontier
Deal found 2/10![Frontier logo]()
$244
This Frontier deal was found by Cheapflights users on 2/10. 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.
Thu 3/195:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/2210:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/10![Frontier logo]()
$273
This CheapOair deal was found by Cheapflights users on 2/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1012:59 am
PHX
- STL
1 stop20h 20m
Frontier
Mon 3/168:12 pm
STL
- PHX
1 stop5h 46m
Frontier
Deal found 2/9![Frontier logo]()
$286
Last-minute flights from Sky Harbor Intl to St. LouisDiscover last-minute flight deals from Sky Harbor Intl to St. Louis. Data last updated February 11, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to St. Louis. Data last updated February 11, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 2/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/274:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sat 2/282:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Deal found 2/8![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 2/274:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sat 3/78:12 pm
STL
- PHX
1 stop5h 39m
Frontier
Deal found 2/9![Frontier logo]()
$164
This Frontier deal was found by Cheapflights users on 2/9. 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.
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/9![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Wed 3/45:18 pm
STL
- PHX
1 stop7h 41m
Frontier
Deal found 2/10![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Fri 3/68:12 pm
STL
- PHX
1 stop13h 30m
Frontier
Deal found 2/10![Frontier logo]()
$174
This Frontier deal was found by Cheapflights users on 2/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/49:52 am
PHX
- STL
1 stop5h 01m
Frontier
Sat 3/74:21 pm
STL
- PHX
1 stop9h 23m
Frontier
Deal found 2/8![Frontier logo]()
$173
This Super.com deal was found by Cheapflights users on 2/8. 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.
Sun 3/85:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/1510:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/8![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 3/106:45 pm
PHX
- STL
1 stop13h 04m
Frontier
Tue 3/178:06 pm
STL
- PHX
1 stop26h 12m
Frontier
Deal found 2/10![Frontier logo]()
$161
This Expedia deal was found by Cheapflights users on 2/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/155:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Thu 3/1910:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/11![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 3/176:50 am
PHX
- STL
1 stop24h 59m
Frontier
Tue 3/2412:14 pm
STL
- PHX
1 stop10h 04m
Frontier
Deal found 2/10![Frontier logo]()
$166
One-way flights from Sky Harbor Intl to St. LouisSearch for one-way flight options from Sky Harbor Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 11, 2026.
Search for one-way flight options from Sky Harbor Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 11, 2026.
This Frontier deal was found by Cheapflights users on 2/9. 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.
Sat 4/117:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Deal found 2/9![Frontier logo]()
$59
This Frontier deal was found by Cheapflights users on 2/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Deal found 2/8![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Sat 5/99:52 am
PHX
- STL
1 stop7h 20m
Frontier
Deal found 2/9![Frontier logo]()
$65
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 3/106:45 pm
PHX
- STL
1 stop13h 04m
Frontier
Deal found 2/10![Frontier logo]()
$66
This Priceline deal was found by Cheapflights users on 2/9. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/85:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/9![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 5/86:45 pm
PHX
- STL
1 stop22h 27m
Frontier
Deal found 2/9![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 4/76:50 am
PHX
- STL
1 stop24h 58m
Frontier
Deal found 2/10![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Tue 3/243:11 pm
PHX
- STL
1 stop16h 38m
Frontier
Deal found 2/8![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Thu 5/78:52 am
PHX
- STL
1 stop8h 20m
Frontier
Deal found 2/9![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 2/10. 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.
Thu 3/125:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/10![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Wed 2/259:52 am
PHX
- STL
1 stop5h 01m
Frontier
Deal found 2/9![Frontier logo]()
$94
Find flight deals from Sky Harbor Intl to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Sky Harbor Intl (PHX) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $128 (Frontier) |
One-way from | $59 (Frontier) |
Popular in | April |
Cheapest in | January |
Average price | $357 |
Good round-trip deal | $249 or less |
Good one-way deal | $131 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Sky Harbor Intl to St. Louis 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 February 11, 2026.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to St. Louis that are best for you.
Fly from
Sky Harbor Intl
Fly to
St. Louis
Route
Depart
Return
Price
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 5/2
6:50 am-7:12 pm
1 stop10h 22m
Lambert-St Louis
Mon 5/4
8:12 pm-11:46 am
1 stop17h 34m
$136
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 4/11
7:25 am-12:21 pm
Nonstop2h 56m
Lambert-St Louis
Mon 4/13
8:16 pm-11:47 pm
1 stop5h 31m
$184
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 5/1
8:52 am-7:12 pm
1 stop8h 20m
Lambert-St Louis
Sun 5/3
8:12 pm-11:47 pm
1 stop5h 35m
$211
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Mon 2/23
4:09 pm-8:02 pm
Nonstop2h 53m
Lambert-St Louis
Thu 2/26
10:11 pm-8:50 am
1 stop11h 39m
$228
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 4/17
9:24 pm-3:21 pm
2 stops15h 57m
Lambert-St Louis
Sun 4/19
11:21 am-9:23 pm
1 stop12h 02m
$239
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 4/3
9:24 pm-9:48 am
1 stop10h 24m
Lambert-St Louis
Sun 4/5
10:12 pm-9:48 am
1 stop13h 36m
$244
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 3/13
9:24 pm-9:49 am
1 stop10h 25m
Lambert-St Louis
Tue 3/17
8:06 pm-4:08 pm
2 stops22h 02m
$269
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 3/19
5:09 pm-10:02 pm
Nonstop2h 53m
Lambert-St Louis
Sun 3/22
10:47 pm-12:28 am
Nonstop3h 41m
$273
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 3/10
12:59 am-11:19 pm
1 stop20h 20m
Lambert-St Louis
Mon 3/16
8:12 pm-11:58 pm
1 stop5h 46m
$286
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 4/18
6:40 am-11:30 am
Nonstop2h 50m
Lambert-St Louis
Tue 4/21
2:05 pm-3:30 pm
Nonstop3h 25m
$287
Showing 1-10 of 22 results
Compare providers for flights from Sky Harbor Intl to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Sky Harbor Intl to St. Louis in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Phoenix Sky Harbor Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Phoenix Sky Harbor Intl Airport-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Phoenix Sky Harbor Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Sky Harbor Intl to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis 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. Louis
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How far ahead should I book a flight from Phoenix Sky Harbor Intl Airport to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Sky Harbor Intl to St. Louis. Price data was last updated on February 6, 2026.
To ensure you get the cheapest price possible for a flight from Phoenix Sky Harbor Intl Airport to St. Louis, you should look to book at least 25 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Phoenix Sky Harbor Intl Airport to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $93). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in April is currently the most expensive (average of $309). 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 STL?
Find hourly flight availability from Sky Harbor Intl to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 11, 2026.
A simple way to save on the total cost of your ticket is to fly from Phoenix Sky Harbor Intl Airport to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 6% on your trip compared to booking a flight in the evening.
What is the cheapest day to fly from Phoenix Sky Harbor Intl Airport to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to St. Louis. Price data was last updated on February 7, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Louis flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
What’s the top layover airport for flights from Phoenix Sky Harbor Intl Airport to St. Louis?
Share of 1-stop round-trip flights from Phoenix Sky Harbor Intl Airport to St. Louis chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 67% of 1-stop itineraries from Phoenix Sky Harbor Intl Airport to St. Louis on Cheapflights.
What’s the cheapest layover airport for flights from Phoenix Sky Harbor Intl Airport to St. Louis?
Average round-trip fare for 1-stop flights from Phoenix Sky Harbor Intl Airport to St. Louis, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $174.
What’s the fastest layover option from Phoenix Sky Harbor Intl Airport to St. Louis?
Shortest average travel time for 1-stop one-way flights from Phoenix Sky Harbor Intl Airport to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 7h 10m.
Which airport typically offers the quickest layover for flights from Phoenix Sky Harbor Intl Airport to St. Louis?
Average layover duration for 1-stop one-way flights from Phoenix Sky Harbor Intl Airport to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 6h 03m.
The best insider tips for Phoenix Sky Harbor Intl Airport to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Phoenix Sky Harbor Intl Airport to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. 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. Louis. Reviews last updated February 11, 2026.
See what other customers who have flown with Southwest, Delta, and American Airlines from Phoenix Sky Harbor Intl Airport to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Sky Harbor Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
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Sky Harbor Intl and St. Louis flights
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Browse through other flights departing from Sky Harbor Intl. Flights are based on user searches made on Cheapflights and were last updated on February 11, 2026.
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Top 4 airlines flying from Sky Harbor Intl to St. Louis
Discover the top 4 airlines that operate flights from Sky Harbor Intl to St. Louis. 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 February 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$389 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$346 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$258 | Average$394 | FlexibilityNo cancel fee | On-time63% |