$81+ Cheap flights from St. Louis (STL) to Phoenix
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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Jul 24 — Jul 311
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis to Phoenix 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 Lambert-St Louis to Phoenix are usually found in November or October, booked 24 days in advance, depart on a Wednesday or Friday and return on a Friday
Cheap flight deals from St. Louis to Phoenix
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to PhoenixExplore the most affordable flight options available from St. Louis to Phoenix. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 24, 2026.
Explore the most affordable flight options available from St. Louis to Phoenix. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 24, 2026.
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 9/16:45 pm
STL
- PHX
1 stop6h 39m
Frontier
Fri 9/410:30 pm
PHX
- STL
1 stop17h 20m
Frontier
Deal found 6/20![Frontier logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Wed 8/57:03 pm
STL
- PHX
1 stop6h 02m
Frontier
Mon 8/108:40 am
PHX
- STL
1 stop8h 43m
Frontier
Deal found 6/21![Frontier logo]()
$239
This Expedia deal was found by Cheapflights users on 6/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/17:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Fri 8/712:12 am
PHX
- STL
1 stop21h 47m
Frontier
Deal found 6/23![Frontier logo]()
$240
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:09 pm
STL
- PHX
1 stop20h 21m
Frontier
Sat 7/256:24 am
PHX
- STL
1 stop6h 32m
Frontier
Deal found 6/21![Frontier logo]()
$241
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/287:03 pm
STL
- PHX
1 stop19h 56m
Frontier
Thu 7/309:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/22![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Mon 7/134:57 pm
STL
- PHX
2 stops21h 37m
Frontier
Wed 7/159:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/21![Frontier logo]()
$246
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:10 pm
STL
- PHX
1 stop5h 23m
Frontier
Wed 11/188:05 am
PHX
- STL
1 stop13h 34m
Frontier
Deal found 6/19![Frontier logo]()
$247
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.
Sun 8/27:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Wed 8/59:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/20![Frontier logo]()
$249
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:19 pm
STL
- PHX
1 stop6h 16m
Frontier
Mon 10/2611:31 pm
PHX
- STL
1 stop8h 09m
Frontier
Deal found 6/21![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 8/117:03 pm
STL
- PHX
1 stop19h 56m
Frontier
Wed 8/192:04 pm
PHX
- STL
2 stops24h 07m
Frontier
Deal found 6/23![Frontier logo]()
$251
This Kiwi.com deal was found by Cheapflights users on 6/22. 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.
Fri 8/77:10 pm
STL
- PHX
1 stop18h 17m
Frontier
Sun 8/96:24 am
PHX
- STL
1 stop6h 32m
Frontier
Deal found 6/22![Frontier logo]()
$252
Best flights from St. Louis to PhoenixDiscover carefully curated flight deals from St. Louis to Phoenix that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 24, 2026.
Discover carefully curated flight deals from St. Louis to Phoenix that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 24, 2026.
This Southwest deal was found by Cheapflights users on 6/21. 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 7/184:55 pm
STL
- PHX
Nonstop3h 10m
Southwest
Sat 7/258:05 pm
PHX
- STL
Nonstop3h 00m
Southwest
Deal found 6/21![Southwest logo]()
$339
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:00 am
STL
- PHX
2 stops12h 00m
United Airlines
Tue 9/111:32 am
PHX
- STL
2 stops8h 28m
United Airlines
Deal found 6/19![United Airlines logo]()
$389
This American Airlines deal was found by Cheapflights users on 6/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/185:18 pm
STL
- PHX
1 stop7h 20m
American Airlines
Mon 9/218:35 am
PHX
- STL
Nonstop3h 14m
American Airlines
Deal found 6/23![American Airlines logo]()
$430
This Southwest deal was found by Cheapflights users on 6/23. 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 8/18:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Sat 8/86:10 am
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 6/23![Southwest logo]()
$339
This Southwest deal was found by Cheapflights users on 6/23. 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.
Wed 8/1211:55 am
STL
- PHX
Nonstop3h 10m
Southwest
Fri 8/281:30 pm
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 6/23![Southwest logo]()
$397
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.
Wed 7/155:10 am
STL
- PHX
1 stop5h 50m
United Airlines
Tue 7/216:00 am
PHX
- STL
3 stops13h 26m
United Airlines
Deal found 6/20![United Airlines logo]()
$460
This Southwest deal was found by Cheapflights users on 6/23. 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.
Tue 9/18:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Fri 9/46:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 6/23![Southwest logo]()
$397
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.
Sun 8/29:45 pm
STL
- PHX
Nonstop3h 15m
Southwest
Wed 8/55:40 pm
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 6/20![Southwest logo]()
$397
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.
Fri 9/48:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Sun 9/69:20 am
PHX
- STL
1 stop4h 30m
Southwest
Deal found 6/20![Southwest logo]()
$431
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.
Tue 6/306:20 pm
STL
- PHX
Nonstop3h 10m
Southwest
Tue 7/74:45 pm
PHX
- STL
Nonstop3h 00m
Southwest
Deal found 6/19![Southwest logo]()
$435
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 7/42:15 pm
STL
- PHX
1 stop4h 35m
Southwest
Tue 7/77:25 am
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 6/20![Southwest logo]()
$441
Last-minute flights from St. Louis to PhoenixDiscover last-minute flight deals from St. Louis to Phoenix. Data last updated June 24, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Phoenix. Data last updated June 24, 2026 and is based on user searches.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/113:41 pm
STL
- PHX
1 stop9h 18m
Frontier
Sat 7/186:40 am
PHX
- STL
1 stop10h 43m
Frontier
Deal found 6/20![Frontier logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Mon 7/134:57 pm
STL
- PHX
2 stops21h 37m
Frontier
Wed 7/159:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/21![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/147:03 pm
STL
- PHX
1 stop19h 56m
Frontier
Thu 7/167:45 am
PHX
- STL
1 stop8h 30m
Frontier
Deal found 6/22![Frontier logo]()
$254
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:03 pm
STL
- PHX
1 stop6h 02m
Frontier
Tue 7/2111:19 am
PHX
- STL
1 stop6h 04m
Frontier
Deal found 6/21![Frontier logo]()
$255
This Expedia deal was found by Cheapflights users on 6/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/177:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Sat 7/186:40 am
PHX
- STL
1 stop10h 43m
Frontier
Deal found 6/23![Frontier logo]()
$275
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 7/177:10 pm
STL
- PHX
1 stop5h 55m
Frontier
Mon 7/202:16 pm
PHX
- STL
2 stops25h 49m
Frontier
Deal found 6/20![Frontier logo]()
$279
This Super.com deal was found by Cheapflights users on 6/22. 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 7/178:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Tue 7/2112:12 am
PHX
- STL
1 stop21h 47m
Frontier
Deal found 6/22![Frontier logo]()
$281
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:09 pm
STL
- PHX
1 stop20h 21m
Frontier
Sat 7/256:24 am
PHX
- STL
1 stop6h 32m
Frontier
Deal found 6/21![Frontier logo]()
$241
This Expedia deal was found by Cheapflights users on 6/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:09 pm
STL
- PHX
1 stop20h 21m
Frontier
Tue 7/282:04 pm
PHX
- STL
1 stop26h 01m
Frontier
Deal found 6/23![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/287:03 pm
STL
- PHX
1 stop19h 56m
Frontier
Thu 7/309:58 pm
PHX
- STL
1 stop18h 17m
Frontier
Deal found 6/22![Frontier logo]()
$245
One-way flights from St. Louis to PhoenixSearch for one-way flight options from St. Louis to Phoenix. Find affordable one-way fares based on user searches. Data last updated June 24, 2026.
Search for one-way flight options from St. Louis to Phoenix. Find affordable one-way fares based on user searches. Data last updated June 24, 2026.
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 7/217:03 pm
STL
- PHX
1 stop19h 56m
Frontier
Deal found 6/20![Frontier logo]()
$81
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.
Mon 8/177:10 pm
STL
- PHX
1 stop19h 49m
Frontier
Deal found 6/18![Frontier logo]()
$82
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.
Tue 8/188:00 am
STL
- PHX
1 stop17h 24m
Frontier
Deal found 6/20![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 6/22. 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.
Wed 8/196:45 pm
STL
- PHX
1 stop6h 39m
Frontier
Deal found 6/22![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/207:10 pm
STL
- PHX
1 stop19h 49m
Frontier
Deal found 6/22![Frontier logo]()
$89
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 8/216:45 pm
STL
- PHX
1 stop20h 03m
Frontier
Deal found 6/20![Frontier logo]()
$92
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.
Thu 8/137:10 pm
STL
- PHX
1 stop18h 17m
Frontier
Deal found 6/18![Frontier logo]()
$109
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.
Sun 8/167:10 pm
STL
- PHX
2 stops38h 48m
Frontier
Deal found 6/20![Frontier logo]()
$112
Find flight deals from St. Louis to Phoenix
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Phoenix (PH1). 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 24, 2026.
Round-trip from | $237 (Kiwi.com) |
|---|---|
One-way from | $81 (Kiwi.com) |
Popular in | June |
Cheapest in | November |
Average price | $424 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Phoenix 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 24, 2026.
Use the filters below to find and compare flights from St. Louis to Phoenix that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 7/18
4:55 pm-6:05 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Sat 7/25
8:05 pm-1:05 am
Nonstop3h 00m
$339
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 8/1
8:45 pm-9:55 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Sat 8/8
6:10 am-11:05 am
Nonstop2h 55m
$339
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Thu 8/27
8:00 am-6:00 pm
2 stops12h 00m
Phoenix Sky Harbor Intl
Tue 9/1
11:32 am-10:00 pm
2 stops8h 28m
$389
Quickest round-trip
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 8/12
11:55 am-1:05 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Fri 8/28
1:30 pm-6:20 pm
Nonstop2h 50m
$397
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 9/1
8:45 pm-9:55 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Fri 9/4
6:55 pm-11:50 pm
Nonstop2h 55m
$397
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sun 8/2
9:45 pm-11:00 pm
Nonstop3h 15m
Phoenix Sky Harbor Intl
Wed 8/5
5:40 pm-10:35 pm
Nonstop2h 55m
$397
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 9/18
5:18 pm-10:38 pm
1 stop7h 20m
Phoenix Sky Harbor Intl
Mon 9/21
8:35 am-1:49 pm
Nonstop3h 14m
$430
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 9/4
8:45 pm-9:55 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Sun 9/6
9:20 am-3:50 pm
1 stop4h 30m
$431
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 6/30
6:20 pm-7:30 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Tue 7/7
4:45 pm-9:45 pm
Nonstop3h 00m
$435
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 7/4
2:15 pm-4:50 pm
1 stop4h 35m
Phoenix Sky Harbor Intl
Tue 7/7
7:25 am-12:20 pm
Nonstop2h 55m
$441
Showing 1-10 of 22 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Phoenix
Have a flexible travel schedule? Discover the best time to fly to Phoenix from St. Louis with our price prediction graph.
STL-PH1
STL-PHX
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 St. Louis to Phoenix
STL-PH1
STL-PHX
What is the cheapest month to book a flight from St. Louis to Phoenix?
Currently, December is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $40). Flying from St. Louis to Phoenix in June is currently the most expensive (average of $200). 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 STL to PHX?
Find hourly flight availability from St. Louis to Phoenix. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 24, 2026.
When flying from St. Louis to Phoenix, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 30% versus a flight in the morning.
Weekly flight availability from St. Louis to Phoenix
Explore weekly flight availability from St. Louis to Phoenix. 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 24, 2026.
The most flights from STL to PH1 are scheduled on a Monday (8 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from St. Louis to Phoenix?
How far ahead should I book a flight from St. Louis to Phoenix?
The best time to book flights from St. Louis to Phoenix is 23 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from St. Louis to Phoenix?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Phoenix. Price data was last updated on June 20, 2026.
Travelers seeking maximum savings on their St. Louis to Phoenix flight should consider departing on Friday evenings 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 Phoenix
Get insights into the airlines that provide service to Phoenix. 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 Phoenix. Reviews last updated June 24, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andAmerican Airlines from St. Louis to Phoenix to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Overall
7.9
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Overall
7.9
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Overall
7.9
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Overall
7.9
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Overall
7.9
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Phoenix. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from St. Louis
Popular flights
Alternative routes for St. Louis to Phoenix
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Phoenix by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Phoenix by cabin class
Find flights from St. Louis to Phoenix, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Phoenix flights
Browse other St. Louis and Phoenix flight options. Last updated on June 24, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on June 24, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from St. Louis to Phoenix
Discover the top 4 airlines that operate flights from St. Louis to Phoenix. 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 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$210 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$381 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$213 | Average$382 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$220 | Average$397 | FlexibilityNo cancel fee | On-time63% |