$79+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Apr 23 — Apr 301
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 January or December, booked 25 days in advance, depart on a Friday or Tuesday and return on a Wednesday
Cheap flight deals from Phoenix to St. Louis
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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 March 24, 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 March 24, 2026.
This Expedia deal was found by Cheapflights users on 3/22. 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 4/1712:30 am
PHX
- STL
1 stop20h 49m
Frontier
Fri 4/249:58 pm
STL
- PHX
1 stop26h 20m
Frontier
Deal found 3/22![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3012:30 am
PHX
- STL
1 stop20h 49m
Frontier
Tue 5/56:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 3/21![Frontier logo]()
$167
This Mytrip deal was found by Cheapflights users on 3/23. 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 Mytrip 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 4/203:21 pm
STL
- PHX
1 stop6h 02m
Frontier
Deal found 3/23![Frontier logo]()
$179
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:35 am
PHX
- STL
1 stop6h 59m
Frontier
Tue 4/144:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Deal found 3/20![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/129:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Fri 4/178:06 pm
STL
- PHX
1 stop5h 36m
Frontier
Deal found 3/20![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:30 am
PHX
- STL
1 stop20h 49m
Frontier
Tue 4/284:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Deal found 3/22![Frontier logo]()
$189
This Travelocity deal was found by Cheapflights users on 3/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:52 am
PHX
- STL
1 stop8h 29m
Frontier
Mon 4/279:55 pm
STL
- PHX
1 stop27h 54m
Frontier
Deal found 3/20![Frontier logo]()
$190
This CheapOair deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:48 pm
PHX
- STL
1 stop12h 39m
Frontier
Mon 4/138:19 pm
STL
- PHX
1 stop23h 28m
Frontier
Deal found 3/21![Frontier logo]()
$191
This Expedia deal was found by Cheapflights users on 3/20. 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.
Sun 4/59:04 pm
PHX
- STL
1 stop12h 18m
Frontier
Fri 4/108:16 pm
STL
- PHX
1 stop23h 31m
Frontier
Deal found 3/20![Frontier logo]()
$195
This CheapOair deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/19:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Sun 5/311:28 am
STL
- PHX
1 stop11h 56m
Frontier
Deal found 3/23![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/109:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Fri 4/178:06 pm
STL
- PHX
1 stop17h 39m
Frontier
Deal found 3/19![Frontier logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 3/22. 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 5/197:40 am
PHX
- STL
1 stop8h 26m
Frontier
Tue 5/268:08 pm
STL
- PHX
1 stop5h 23m
Frontier
Deal found 3/22![Frontier logo]()
$203
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 March 24, 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 March 24, 2026.
This Southwest deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2311:40 pm
PHX
- STL
1 stop6h 40m
Southwest
Tue 6/25:30 am
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/23![Southwest logo]()
$316
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2311:40 pm
PHX
- STL
1 stop6h 40m
Southwest
Tue 5/268:45 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/24![Southwest logo]()
$316
This Southwest deal was found by Cheapflights users on 3/22. 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 7/225:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Sat 8/82:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 3/22![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 3/22. 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 5/196:20 pm
PHX
- STL
Nonstop2h 55m
Southwest
Tue 5/265:30 am
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/22![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 3/21. 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 7/86:35 pm
PHX
- STL
Nonstop2h 55m
Southwest
Fri 7/315:45 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 3/21![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 3/22. 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.
Sun 5/105:30 am
PHX
- STL
Nonstop2h 50m
Southwest
Fri 5/159:40 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/22![Southwest logo]()
$396
This Southwest deal was found by Cheapflights users on 3/21. 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 8/18:05 pm
PHX
- STL
Nonstop2h 55m
Southwest
Mon 8/312:20 pm
STL
- PHX
1 stop4h 30m
Southwest
Deal found 3/21![Southwest logo]()
$401
This Southwest deal was found by Cheapflights users on 3/22. 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
Sat 5/302:35 pm
STL
- PHX
1 stop7h 45m
Southwest
Deal found 3/22![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 3/19. 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.
Sat 5/2311:40 pm
PHX
- STL
1 stop6h 40m
Southwest
Sun 5/315:35 am
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 3/19![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/66:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Sun 8/99:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 3/22![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 3/20. 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.
Fri 6/125:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Fri 6/195:45 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 3/20![Southwest logo]()
$415
Last-minute flights from Phoenix to St. LouisDiscover last-minute flight deals from Phoenix to St. Louis. Data last updated March 24, 2026 and is based on user searches.
Discover last-minute flight deals from Phoenix to St. Louis. Data last updated March 24, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 3/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/14:27 pm
PHX
- STL
1 stop26h 50m
Frontier
Fri 4/108:16 pm
STL
- PHX
1 stop23h 31m
Frontier
Deal found 3/20![Frontier logo]()
$205
This Expedia deal was found by Cheapflights users on 3/20. 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.
Sun 4/59:04 pm
PHX
- STL
1 stop12h 18m
Frontier
Fri 4/108:16 pm
STL
- PHX
1 stop23h 31m
Frontier
Deal found 3/20![Frontier logo]()
$195
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:35 am
PHX
- STL
1 stop6h 59m
Frontier
Tue 4/144:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Deal found 3/20![Frontier logo]()
$180
This CheapOair deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:48 pm
PHX
- STL
1 stop12h 39m
Frontier
Mon 4/138:19 pm
STL
- PHX
1 stop23h 28m
Frontier
Deal found 3/21![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/109:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Fri 4/178:06 pm
STL
- PHX
1 stop17h 39m
Frontier
Deal found 3/19![Frontier logo]()
$199
This Mytrip deal was found by Cheapflights users on 3/23. 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 Mytrip 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 4/203:21 pm
STL
- PHX
1 stop6h 02m
Frontier
Deal found 3/23![Frontier logo]()
$179
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/129:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Fri 4/178:06 pm
STL
- PHX
1 stop5h 36m
Frontier
Deal found 3/20![Frontier logo]()
$185
This Expedia deal was found by Cheapflights users on 3/22. 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 4/1712:30 am
PHX
- STL
1 stop20h 49m
Frontier
Fri 4/249:58 pm
STL
- PHX
1 stop26h 20m
Frontier
Deal found 3/22![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:30 am
PHX
- STL
1 stop20h 49m
Frontier
Tue 4/284:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Deal found 3/22![Frontier logo]()
$189
This Travelocity deal was found by Cheapflights users on 3/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:52 am
PHX
- STL
1 stop8h 29m
Frontier
Mon 4/279:55 pm
STL
- PHX
1 stop27h 54m
Frontier
Deal found 3/20![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/256:50 am
PHX
- STL
1 stop10h 42m
Frontier
Mon 4/278:17 pm
STL
- PHX
1 stop17h 28m
Frontier
Deal found 3/19![Frontier logo]()
$206
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 March 24, 2026.
Search for one-way flight options from Phoenix to St. Louis. Find affordable one-way fares based on user searches. Data last updated March 24, 2026.
This Super.com deal was found by Cheapflights users on 3/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/811:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 3/20![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 3/23. 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 5/1711:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 3/23![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 3/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1712:30 am
PHX
- STL
1 stop20h 49m
Frontier
Deal found 3/20![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/129:24 pm
PHX
- STL
1 stop10h 24m
Frontier
Deal found 3/20![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/23. 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 5/197:40 am
PHX
- STL
1 stop8h 26m
Frontier
Deal found 3/23![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:15 am
PHX
- STL
1 stop12h 08m
Frontier
Deal found 3/23![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:15 am
PHX
- STL
1 stop12h 08m
Frontier
Deal found 3/24![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:30 am
PHX
- STL
1 stop20h 49m
Frontier
Deal found 3/24![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:51 pm
PHX
- STL
1 stop22h 30m
Frontier
Deal found 3/24![Frontier logo]()
$100
This Super.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1511:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 3/22![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2211:30 pm
PHX
- STL
1 stop7h 25m
Frontier
Deal found 3/20![Frontier logo]()
$105
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 March 24, 2026.
Round-trip from | $160 (Expedia) |
|---|---|
One-way from | $79 (Super.com) |
Popular in | April |
Cheapest in | January |
Average price | $406 |
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 March 24, 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
Sat 5/23
11:40 pm-8:20 am
1 stop6h 40m
Lambert-St Louis
Tue 6/2
5:30 am-6:55 am
Nonstop3h 25m
$316
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 5/23
11:40 pm-8:20 am
1 stop6h 40m
Lambert-St Louis
Tue 5/26
8:45 pm-10:10 pm
Nonstop3h 25m
$316
Quickest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 7/22
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Sat 8/8
2:15 pm-3:25 pm
Nonstop3h 10m
$375
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 5/19
6:20 pm-11:15 pm
Nonstop2h 55m
Lambert-St Louis
Tue 5/26
5:30 am-6:55 am
Nonstop3h 25m
$375
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 7/8
6:35 pm-11:30 pm
Nonstop2h 55m
Lambert-St Louis
Fri 7/31
5:45 am-6:55 am
Nonstop3h 10m
$395
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sun 5/10
5:30 am-10:20 am
Nonstop2h 50m
Lambert-St Louis
Fri 5/15
9:40 pm-11:05 pm
Nonstop3h 25m
$396
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 8/1
8:05 pm-1:00 am
Nonstop2h 55m
Lambert-St Louis
Mon 8/31
2:20 pm-4:50 pm
1 stop4h 30m
$401
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 5/22
7:40 pm-12:30 am
Nonstop2h 50m
Lambert-St Louis
Sat 5/30
2:35 pm-8:20 pm
1 stop7h 45m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 5/23
11:40 pm-8:20 am
1 stop6h 40m
Lambert-St Louis
Sun 5/31
5:35 am-7:00 am
Nonstop3h 25m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 8/6
6:55 pm-11:50 pm
Nonstop2h 55m
Lambert-St Louis
Sun 8/9
9:15 pm-10:25 pm
Nonstop3h 10m
$415
Showing 1-10 of 22 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
How far ahead should I book a flight from Phoenix to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Phoenix to St. Louis. Price data was last updated on March 13, 2026.
To ensure you get the cheapest price possible for a flight from Phoenix 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 to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $93). Flying from Phoenix to St. Louis in April is currently the most expensive (average of $302). 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 March 24, 2026.
A simple way to save on the total cost of your ticket is to fly from Phoenix to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 7% on your trip compared to booking a flight in the evening.
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 March 23, 2026.
Travelers seeking maximum savings on their Phoenix 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.
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 March 24, 2026.
The most flights from PH1 to STL are scheduled on a Tuesday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).
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 March 24, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andAmerican Airlines 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.
Entertainment
7.5
Overall
8.0
Food
7.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Food
7.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Food
7.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Food
7.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Food
7.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
Browse thousands of different options on Cheapflights for your next trip
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St. Louis flight routes
Alternative routes for Phoenix to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
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 March 24, 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 March 24, 2026.
Top 4 airlines flying from Phoenix to St. Louis
Discover the top 4 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 March 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$228 | Average$382 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$258 | Average$394 | FlexibilityNo cancel fee | On-time63% |