$77+ Cheap flights from Phoenix 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Jul 21 — Jul 281
Round-trip
1 adult, Economy
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Find cheap flights from Phoenix 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 to Lambert-St Louis are usually found in October or January, booked 25 days in advance, depart on a Friday or Saturday and return on a Wednesday
Cheap flight deals from Phoenix to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Phoenix to St. LouisExplore the most affordable flight options available from Phoenix to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 21, 2026.
Explore the most affordable flight options available from Phoenix to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 21, 2026.
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/110:32 pm
PHX
- STL
1 stop10h 46m
Frontier
Thu 7/98:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Deal found 6/16![Frontier logo]()
$309
This Expedia deal was found by Cheapflights users on 6/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:40 am
PHX
- STL
1 stop8h 43m
Frontier
Sun 8/27:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/16![Frontier logo]()
$310
This Kiwi.com deal was found by Cheapflights users on 6/16. 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.
Sun 8/169:04 am
PHX
- STL
2 stops21h 53m
Frontier
Wed 8/196:58 pm
STL
- PHX
1 stop18h 26m
Frontier
Deal found 6/16![Frontier logo]()
$317
This Super.com deal was found by Cheapflights users on 6/16. 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.
Sat 7/46:24 am
PHX
- STL
1 stop10h 10m
Frontier
Thu 7/237:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/16![Frontier logo]()
$322
This Expedia deal was found by Cheapflights users on 6/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/46:24 am
PHX
- STL
1 stop10h 10m
Frontier
Sun 7/124:09 pm
STL
- PHX
1 stop20h 21m
Frontier
Deal found 6/16![Frontier logo]()
$323
This Southwest deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 7/286:10 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/18![Southwest logo]()
$339
This CheapOair deal was found by Cheapflights users on 6/16. 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.
Tue 6/3010:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Fri 7/37:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 6/16![Frontier logo]()
$340
This Expedia deal was found by Cheapflights users on 6/20. 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 7/112:35 am
PHX
- STL
1 stop21h 14m
Frontier
Tue 7/78:08 pm
STL
- PHX
1 stop18h 32m
Frontier
Deal found 6/20![Frontier logo]()
$341
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:58 pm
PHX
- STL
2 stops17h 39m
Frontier
Wed 7/227:03 pm
STL
- PHX
1 stop6h 02m
Frontier
Deal found 6/18![Frontier logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 10/810:40 pm
PHX
- STL
2 stops18h 35m
Frontier
Wed 10/148:10 pm
STL
- PHX
1 stop13h 01m
Frontier
Deal found 6/20![Frontier logo]()
$343
This American Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/131:15 am
PHX
- STL
1 stop9h 36m
American Airlines
Tue 7/288:01 am
STL
- PHX
Nonstop3h 16m
American Airlines
Deal found 6/20![American Airlines logo]()
$345
This CheapOair deal was found by Cheapflights users on 6/19. 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 6/232:00 pm
PHX
- STL
1 stop26h 51m
Frontier
Sat 6/272:56 pm
STL
- PHX
1 stop10h 04m
Frontier
Deal found 6/19![Frontier logo]()
$346
Best flights from Phoenix to St. LouisDiscover carefully curated flight deals from Phoenix to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 21, 2026.
Discover carefully curated flight deals from Phoenix to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 21, 2026.
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:30 am
PHX
- STL
1 stop7h 34m
United Airlines
Wed 8/198:00 am
STL
- PHX
2 stops9h 16m
United Airlines
Deal found 6/16![United Airlines logo]()
$384
This Southwest deal was found by Cheapflights users on 6/17. 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 9/95:40 pm
PHX
- STL
Nonstop2h 55m
Southwest
Sun 9/139:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/17![Southwest logo]()
$414
This Southwest deal was found by Cheapflights users on 6/16. 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.
Sat 7/48:50 am
PHX
- STL
Nonstop3h 00m
Southwest
Fri 7/241:20 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/16![Southwest logo]()
$425
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Wed 9/29:23 am
PHX
- STL
2 stops10h 37m
United Airlines
Wed 9/910:53 am
STL
- PHX
2 stops12h 00m
United Airlines
Deal found 6/18![United Airlines logo]()
$441
This Southwest deal was found by Cheapflights users on 6/20. 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 7/43:20 pm
PHX
- STL
Nonstop2h 55m
Southwest
Thu 7/234:45 pm
STL
- PHX
1 stop4h 30m
Southwest
Deal found 6/20![Southwest logo]()
$435
This United Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:10 am
PHX
- STL
2 stops13h 16m
United Airlines
Sat 7/251:18 pm
STL
- PHX
2 stops12h 41m
United Airlines
Deal found 6/20![United Airlines logo]()
$460
This Southwest deal was found by Cheapflights users on 6/16. 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 9/116:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Mon 9/142:20 pm
STL
- PHX
1 stop4h 30m
Southwest
Deal found 6/16![Southwest logo]()
$445
This Southwest deal was found by Cheapflights users on 6/16. 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.
Sat 7/43:20 pm
PHX
- STL
Nonstop2h 55m
Southwest
Mon 7/135:45 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/16![Southwest logo]()
$457
This Southwest deal was found by Cheapflights users on 6/17. 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 7/38:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Mon 7/67:20 am
STL
- PHX
Nonstop3h 15m
Southwest
Deal found 6/17![Southwest logo]()
$470
This Southwest deal was found by Cheapflights users on 6/19. 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 6/265:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Wed 7/19:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/19![Southwest logo]()
$470
Last-minute flights from Phoenix to St. LouisDiscover last-minute flight deals from Phoenix to St. Louis. Data last updated June 21, 2026 and is based on user searches.
Discover last-minute flight deals from Phoenix to St. Louis. Data last updated June 21, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2212:35 am
PHX
- STL
1 stop21h 14m
Frontier
Wed 7/17:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 6/15![Frontier logo]()
$331
This CheapOair deal was found by Cheapflights users on 6/19. 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 6/232:00 pm
PHX
- STL
1 stop26h 51m
Frontier
Sat 6/272:56 pm
STL
- PHX
1 stop10h 04m
Frontier
Deal found 6/19![Frontier logo]()
$346
This CheapOair deal was found by Cheapflights users on 6/16. 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.
Tue 6/3010:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Fri 7/37:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 6/16![Frontier logo]()
$340
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/110:32 pm
PHX
- STL
1 stop10h 46m
Frontier
Thu 7/98:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Deal found 6/16![Frontier logo]()
$309
This Expedia deal was found by Cheapflights users on 6/20. 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 7/112:35 am
PHX
- STL
1 stop21h 14m
Frontier
Tue 7/78:08 pm
STL
- PHX
1 stop18h 32m
Frontier
Deal found 6/20![Frontier logo]()
$341
This Super.com deal was found by Cheapflights users on 6/16. 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.
Sat 7/46:24 am
PHX
- STL
1 stop10h 10m
Frontier
Thu 7/237:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/16![Frontier logo]()
$322
This Expedia deal was found by Cheapflights users on 6/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/46:24 am
PHX
- STL
1 stop10h 10m
Frontier
Sun 7/124:09 pm
STL
- PHX
1 stop20h 21m
Frontier
Deal found 6/16![Frontier logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:58 pm
PHX
- STL
2 stops17h 39m
Frontier
Wed 7/227:03 pm
STL
- PHX
1 stop6h 02m
Frontier
Deal found 6/18![Frontier logo]()
$342
This American Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/131:15 am
PHX
- STL
1 stop9h 36m
American Airlines
Tue 7/288:01 am
STL
- PHX
Nonstop3h 16m
American Airlines
Deal found 6/20![American Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 7/286:10 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 6/18![Southwest logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:45 am
PHX
- STL
1 stop8h 30m
Frontier
Thu 7/307:10 pm
STL
- PHX
2 stops17h 01m
Frontier
Deal found 6/17![Frontier logo]()
$348
This Expedia deal was found by Cheapflights users on 6/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:40 am
PHX
- STL
1 stop8h 43m
Frontier
Sun 8/27:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Deal found 6/16![Frontier logo]()
$310
One-way flights from Phoenix to St. LouisSearch for one-way flight options from Phoenix to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 21, 2026.
Search for one-way flight options from Phoenix to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 21, 2026.
This Trip.com deal was found by Cheapflights users on 6/17. 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.
Tue 7/149:58 pm
PHX
- STL
1 stop18h 07m
Frontier
Deal found 6/17![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/17:45 am
PHX
- STL
1 stop8h 30m
Frontier
Deal found 6/20![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/159:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/20![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 8/1810:09 pm
PHX
- STL
1 stop17h 41m
Frontier
Deal found 6/20![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:58 pm
PHX
- STL
1 stop18h 07m
Frontier
Deal found 6/18![Frontier logo]()
$90
This Trip.com deal was found by Cheapflights users on 6/20. 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 8/77:45 am
PHX
- STL
1 stop8h 30m
Frontier
Deal found 6/20![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 6/18. 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.
Sun 8/169:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/18![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 8/149:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/20![Frontier logo]()
$108
Find flight deals from Phoenix to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Phoenix (PH1) 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 June 21, 2026.
Round-trip from | $309 (Travelocity) |
|---|---|
One-way from | $77 (Trip.com) |
Popular in | March |
Cheapest in | October |
Average price | $435 |
Cheapflights Fare Finder
Customize your flight search to find flights from Phoenix 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 June 21, 2026.
Use the filters below to find and compare flights from Phoenix to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 8/18
8:30 am-6:04 pm
1 stop7h 34m
Lambert-St Louis
Wed 8/19
8:00 am-3:16 pm
2 stops9h 16m
$384
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 9/9
5:40 pm-10:35 pm
Nonstop2h 55m
Lambert-St Louis
Sun 9/13
9:15 pm-10:25 pm
Nonstop3h 10m
$414
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 7/4
8:50 am-1:50 pm
Nonstop3h 00m
Lambert-St Louis
Fri 7/24
1:20 pm-2:30 pm
Nonstop3h 10m
$425
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 7/4
3:20 pm-8:15 pm
Nonstop2h 55m
Lambert-St Louis
Thu 7/23
4:45 pm-7:15 pm
1 stop4h 30m
$435
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 9/2
9:23 am-10:00 pm
2 stops10h 37m
Lambert-St Louis
Wed 9/9
10:53 am-8:53 pm
2 stops12h 00m
$441
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 9/11
6:55 pm-11:50 pm
Nonstop2h 55m
Lambert-St Louis
Mon 9/14
2:20 pm-4:50 pm
1 stop4h 30m
$445
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 7/4
3:20 pm-8:15 pm
Nonstop2h 55m
Lambert-St Louis
Mon 7/13
5:45 am-6:55 am
Nonstop3h 10m
$457
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 7/18
6:10 am-9:26 pm
2 stops13h 16m
Lambert-St Louis
Sat 7/25
1:18 pm-11:59 pm
2 stops12h 41m
$460
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 7/3
8:55 pm-1:50 am
Nonstop2h 55m
Lambert-St Louis
Mon 7/6
7:20 am-8:35 am
Nonstop3h 15m
$470
Quickest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 6/26
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Wed 7/1
9:15 pm-10:25 pm
Nonstop3h 10m
$470
Showing 1-10 of 20 resultsSorted by cheapest first
Best time to book a flight from Phoenix to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Phoenix with our price prediction graph.
PH1-STL
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 to St. Louis
PH1-STL
PHX-STL
What is the cheapest month to book a flight from Phoenix to St. Louis?
Currently, February is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $78). Flying from Phoenix to St. Louis in June is currently the most expensive (average of $237). 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 Phoenix 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 June 21, 2026.
A simple way to save on the total cost of your ticket is to fly from Phoenix to St. Louis at noon. If you’re flexible enough to do this you can expect to save up to 15% on your trip compared to booking a flight in the evening.
Weekly flight availability from Phoenix to St. Louis
Explore weekly flight availability from Phoenix to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 21, 2026.
The most flights from PH1 to STL are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Phoenix to St. Louis?
How far ahead should I book a flight from Phoenix to St. Louis?
To ensure you get the cheapest price possible for a flight from Phoenix to St. Louis, you should look to book at least 24 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 day to fly from Phoenix to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Phoenix to St. Louis. Price data was last updated on June 13, 2026.
Travelers seeking maximum savings on their Phoenix to St. Louis flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing St. 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 June 21, 2026.
Get a feel of what it's like to fly with Southwest,American Airlines, andFrontier from Phoenix to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Phoenix 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
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Alton
Farmington
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St. Louis flight routes
Alternative routes for Phoenix to St. Louis
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Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Phoenix to St. Louis by cabin class
Find flights from Phoenix to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Phoenix and St. Louis flights
Browse other Phoenix and St. Louis flight options. Last updated on June 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 21, 2026.
Top 3 airlines flying from Phoenix to St. Louis
Discover the top 3 airlines that operate flights from Phoenix 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 June 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$202 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$385 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$261 | Average$408 | FlexibilityNo cancel fee | On-time63% |