$82+ Cheap flights from St. Louis (STL) to Sky Harbor Intl (PHX)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Oct 23 — Oct 301
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Sky Harbor Intl 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 Sky Harbor Intl are usually found in November or December, booked 16 days in advance, depart on a Wednesday or Friday and return on a Saturday
Cheap flight deals from St. Louis to Sky Harbor Intl
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to Sky Harbor IntlExplore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 23, 2026.
Explore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 23, 2026.
This Expedia deal was found by Cheapflights users on 9/22. 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.
Tue 10/207:02 am -
2 stops13h 40m
Sat 10/249:15 am -
1 stop7h 42m
Deal found 9/22![Multiple Airlines logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 9/21. 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.
Fri 10/165:53 pm -
1 stop7h 06m
Sat 10/178:16 am -
2 stops8h 41m
Deal found 9/21![Frontier logo]()
$295
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 10/161:30 pm -
2 stops20h 40m
Mon 10/195:01 am -
1 stop9h 57m
Deal found 9/22![Frontier logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 9/21. 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.
Sat 10/177:42 pm -
1 stop6h 06m
Sun 10/2510:12 pm -
1 stop23h 01m
Deal found 9/21![Frontier logo]()
$297
This Cheapflightsfares deal was found by Cheapflights users on 9/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:19 pm -
1 stop9h 29m
Sun 10/1810:12 pm -
1 stop23h 01m
Deal found 9/22![Frontier logo]()
$298
This Mytrip deal was found by Cheapflights users on 9/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:26 pm -
2 stops29h 28m
Mon 11/96:53 am -
2 stops11h 21m
Deal found 9/21![Frontier logo]()
$299
This Cheapflightsfares deal was found by Cheapflights users on 9/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:30 pm -
1 stop30h 12m
Mon 10/265:01 am -
1 stop9h 57m
Deal found 9/23![Frontier logo]()
$300
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/213:04 pm -
1 stop10h 38m
Fri 11/2711:14 pm -
1 stop23h 45m
Deal found 9/18![Frontier logo]()
$301
This Cheapflightsfares deal was found by Cheapflights users on 9/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:42 pm -
1 stop14h 28m
Wed 10/148:16 am -
1 stop25h 15m
Deal found 9/21![Frontier logo]()
$303
This Kiwi.com deal was found by Cheapflights users on 9/22. 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.
Thu 10/154:30 pm -
2 stops24h 39m
Sat 10/176:15 am -
1 stop10h 42m
Deal found 9/22![Frontier logo]()
$305
This Cheapflightsfares deal was found by Cheapflights users on 9/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:42 pm -
1 stop14h 28m
Tue 10/138:51 pm -
1 stop16h 33m
Deal found 9/21![Frontier logo]()
$306
Best flights from St. Louis to Sky Harbor IntlDiscover carefully curated flight deals from St. Louis to Sky Harbor Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 23, 2026.
Discover carefully curated flight deals from St. Louis to Sky Harbor Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 23, 2026.
This Southwest deal was found by Cheapflights users on 9/21. 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.
Mon 10/269:50 pm -
Nonstop3h 25m
Wed 10/285:00 am -
Nonstop2h 50m
Deal found 9/21![Southwest logo]()
$337
This Southwest deal was found by Cheapflights users on 9/20. 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.
Thu 10/229:50 pm -
Nonstop3h 25m
Mon 10/265:10 am -
Nonstop2h 50m
Deal found 9/20![Southwest logo]()
$337
This Southwest deal was found by Cheapflights users on 9/22. 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.
Mon 12/75:55 am -
Nonstop3h 25m
Mon 12/148:35 am -
Nonstop2h 55m
Deal found 9/22![Southwest logo]()
$337
This Southwest deal was found by Cheapflights users on 9/20. 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.
Thu 11/59:45 pm -
Nonstop3h 30m
Mon 11/95:45 am -
Nonstop2h 45m
Deal found 9/20![Southwest logo]()
$337
This Southwest deal was found by Cheapflights users on 9/20. 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.
Wed 11/48:25 am -
1 stop4h 50m
Sat 11/76:05 pm -
Nonstop2h 55m
Deal found 9/20![Southwest logo]()
$343
This Southwest deal was found by Cheapflights users on 9/22. 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.
Mon 11/168:25 am -
1 stop5h 00m
Wed 11/188:35 am -
Nonstop2h 55m
Deal found 9/22![Southwest logo]()
$343
This Southwest deal was found by Cheapflights users on 9/20. 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.
Mon 11/168:25 am -
1 stop4h 50m
Mon 11/238:25 pm -
Nonstop2h 55m
Deal found 9/20![Southwest logo]()
$343
This Southwest deal was found by Cheapflights users on 9/18. 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.
Thu 10/159:50 pm -
Nonstop3h 25m
Tue 10/209:50 am -
1 stop5h 40m
Deal found 9/18![Southwest logo]()
$347
This Southwest deal was found by Cheapflights users on 9/18. 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.
Thu 12/105:55 am -
Nonstop3h 25m
Sat 12/128:55 am -
2 stops6h 55m
Deal found 9/18![Southwest logo]()
$352
This Southwest deal was found by Cheapflights users on 9/18. 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.
Fri 11/65:05 am -
Nonstop3h 25m
Mon 11/95:45 am -
Nonstop2h 45m
Deal found 9/18![Southwest logo]()
$353
Last-minute flights from St. Louis to Sky Harbor IntlDiscover last-minute flight deals from St. Louis to Sky Harbor Intl. Data last updated September 23, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Sky Harbor Intl. Data last updated September 23, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:42 pm -
1 stop14h 28m
Wed 10/148:16 am -
1 stop25h 15m
Deal found 9/21![Frontier logo]()
$303
This Cheapflightsfares deal was found by Cheapflights users on 9/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:42 pm -
1 stop14h 28m
Tue 10/138:51 pm -
1 stop16h 33m
Deal found 9/21![Frontier logo]()
$306
This Cheapflightsfares deal was found by Cheapflights users on 9/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:19 pm -
1 stop9h 29m
Sun 10/1810:12 pm -
1 stop23h 01m
Deal found 9/22![Frontier logo]()
$298
This Kiwi.com deal was found by Cheapflights users on 9/22. 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.
Thu 10/154:30 pm -
2 stops24h 39m
Sat 10/176:15 am -
1 stop10h 42m
Deal found 9/22![Frontier logo]()
$305
This Kiwi.com deal was found by Cheapflights users on 9/21. 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.
Fri 10/165:53 pm -
1 stop7h 06m
Sat 10/178:16 am -
2 stops8h 41m
Deal found 9/21![Frontier logo]()
$295
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 10/161:30 pm -
2 stops20h 40m
Mon 10/195:01 am -
1 stop9h 57m
Deal found 9/22![Frontier logo]()
$296
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/168:00 pm -
1 stop14h 10m
Sun 10/1810:12 pm -
1 stop23h 01m
Deal found 9/19![Frontier logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 9/21. 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.
Sat 10/177:42 pm -
1 stop6h 06m
Sun 10/2510:12 pm -
1 stop23h 01m
Deal found 9/21![Frontier logo]()
$297
This Expedia deal was found by Cheapflights users on 9/22. 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.
Tue 10/207:02 am -
2 stops13h 40m
Sat 10/249:15 am -
1 stop7h 42m
Deal found 9/22![Multiple Airlines logo]()
$294
This Cheapflightsfares deal was found by Cheapflights users on 9/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:30 pm -
1 stop30h 12m
Mon 10/265:01 am -
1 stop9h 57m
Deal found 9/23![Frontier logo]()
$300
One-way flights from St. Louis to Sky Harbor IntlSearch for one-way flight options from St. Louis to Sky Harbor Intl. Find affordable one-way fares based on user searches. Data last updated September 23, 2026.
Search for one-way flight options from St. Louis to Sky Harbor Intl. Find affordable one-way fares based on user searches. Data last updated September 23, 2026.
This Super.com deal was found by Cheapflights users on 9/22. 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.
Sat 10/247:42 pm -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 9/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/167:54 pm -
1 stop5h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 9/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:18 pm -
1 stop9h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$87
This Expedia deal was found by Cheapflights users on 9/22. 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.
Mon 11/27:59 pm -
1 stop14h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 9/20. 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.
Wed 10/144:19 pm -
1 stop5h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 9/21. 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 10/177:42 pm -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/166:44 pm -
2 stops20h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 9/23. 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.
Sat 11/213:04 pm -
1 stop10h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 9/23. 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.
Wed 10/214:19 pm -
1 stop17h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$106
Find flight deals from St. Louis to Sky Harbor Intl
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Sky Harbor Intl (PHX). 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 September 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $294 (Expedia) |
One-way from | $82 (Super.com) |
Popular in | August |
Cheapest in | November |
Average price | $402 |
Good round-trip deal | $392 or less |
Good one-way deal | $206 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Sky Harbor Intl 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 7,457,451 searches. Data last updated September 23, 2026.
Use the filters below to find and compare flights from St. Louis to Phoenix Sky Harbor Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Thu 10/29
2:05 pm-3:30 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$169
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Thu 12/10
5:55 am-8:20 am
Nonstop3h 25m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$169
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Tue 11/17
8:25 am-12:15 pm
1 stop4h 50m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$174
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Tue 11/17
3:30 pm-9:05 pm
1 stop6h 35m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$179
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Thu 10/29
4:39 pm-9:53 pm
1 stop7h 14m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$179
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Thu 10/22
7:40 pm-11:30 pm
1 stop5h 50m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$179
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Thu 10/22
7:00 pm-11:58 pm
1 stop6h 58m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$195
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Tue 11/17
9:59 am-9:37 pm
2 stops12h 38m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$239
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Sat 11/14
7:30 am-3:28 pm
2 stops8h 58m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$239
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Wed 12/16
8:40 am-9:59 pm
3 stops14h 19m
Phoenix Sky Harbor Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$244
Showing 1-10 of 20 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Sky Harbor Intl
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Sky Harbor Intl in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Phoenix Sky Harbor Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Phoenix Sky Harbor Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Phoenix Sky Harbor Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Phoenix Sky Harbor Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Phoenix Sky Harbor Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Sky Harbor Intl
Have a flexible travel schedule? Discover the best time to fly to Sky Harbor Intl from St. Louis with our price prediction graph.
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 Sky Harbor Intl Airport
Prices
Airlines
More
How far ahead should I book a flight from St. Louis to Phoenix Sky Harbor Intl Airport?
Booking 15 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Phoenix Sky Harbor Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from St. Louis to Phoenix Sky Harbor Intl Airport?
Currently, November is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $335). Flying from St. Louis to Phoenix Sky Harbor Intl Airport in August is currently the most expensive (average of $441). 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 Sky Harbor Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 23, 2026.
When flying from St. Louis to Phoenix Sky Harbor Intl Airport, 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 31% versus a flight in the morning.
What is the cheapest day to fly from St. Louis to Phoenix Sky Harbor Intl Airport?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Sky Harbor Intl. Price data was last updated on September 19, 2026.
Travelers seeking maximum savings on their St. Louis to Phoenix Sky Harbor Intl Airport flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
What’s the top layover airport for flights from St. Louis to Phoenix Sky Harbor Intl Airport?
Share of 1-stop round-trip flights from St. Louis to Phoenix Sky Harbor Intl Airport chosen by Cheapflights users in the past 12 months, using the same layover each way.
Las Vegas (LAS) – chosen by Cheapflights users on 67% of 1-stop itineraries from St. Louis to Phoenix Sky Harbor Intl Airport on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to Phoenix Sky Harbor Intl Airport?
Average round-trip fare for 1-stop flights from St. Louis to Phoenix Sky Harbor Intl Airport, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $231.
What’s the fastest layover option from St. Louis to Phoenix Sky Harbor Intl Airport?
Shortest average travel time for 1-stop one-way flights from St. Louis to Phoenix Sky Harbor Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Las Vegas (LAS) have the shortest average one-way travel time for 1-stop routes: 11h 39m.
Which airport typically offers the quickest layover for flights from St. Louis to Phoenix Sky Harbor Intl Airport?
Average layover duration for 1-stop one-way flights from St. Louis to Phoenix Sky Harbor Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Las Vegas (LAS) offer the fastest connection on this route, with an average layover time of 6h 26m.
The best insider tips for St. Louis to Phoenix Sky Harbor Intl Airport flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Phoenix Sky Harbor Intl Airport trip
Our travel experts
Reviews of airlines servicing Sky Harbor Intl
Get insights into the airlines that provide service to Sky Harbor Intl. 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 Sky Harbor Intl. Reviews last updated September 23, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andJetBlue from St. Louis to Phoenix Sky Harbor Intl Airport 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
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Sky Harbor Intl. 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 Phoenix Sky Harbor Intl Airport?
Book flights to Phoenix Sky Harbor Intl Airport if you plan to visit one of these locationsGlendale
Buckeye
Payson
Goodyear
Surprise
Wickenburg
Paradise Valley
Peoria
Chandler
Casa Grande
Camp Verde
Globe
Fountain Hills
Guadalupe
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Top 5 airlines flying from St. Louis to Sky Harbor Intl
Discover the top 5 airlines that operate flights from St. Louis to Sky Harbor Intl. 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 7,457,451 searches. Data last updated September 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$227 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$381 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$244 | Average$397 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$255 | Average$421 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$380 | FlexibilityNo cancel fee | On-time62% |