$82+ Cheap flights from Phoenix to St. Louis (STL)
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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Oct 22 — Oct 291
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 November, booked 10 days in advance, depart on a Saturday or Friday and return on a Wednesday
Cheap flight deals from Phoenix to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Phoenix to St. LouisExplore the most affordable flight options available from Phoenix to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 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 September 22, 2026.
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:16 am -
2 stops8h 41m
Fri 10/168:00 pm -
1 stop14h 10m
Deal found 9/20![Frontier logo]()
$279
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.
Mon 10/266:00 am -
2 stops11h 15m
Mon 11/26:44 pm -
2 stops20h 01m
Deal found 9/21![Frontier logo]()
$280
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/109:15 am -
1 stop7h 42m
Mon 10/196:35 pm -
2 stops21h 07m
Deal found 9/20![Frontier logo]()
$281
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.
Tue 10/68:56 pm -
1 stop20h 21m
Mon 10/126:35 pm -
2 stops17h 12m
Deal found 9/18![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:21 pm -
1 stop6h 38m
Mon 10/126:35 pm -
2 stops17h 12m
Deal found 9/17![Frontier logo]()
$283
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 11/217:34 pm -
1 stop11h 20m
Sat 11/285:15 pm -
1 stop8h 18m
Deal found 9/21![Frontier logo]()
$284
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.
Thu 12/315:13 pm -
1 stop24h 41m
Thu 1/75:59 pm -
1 stop7h 42m
Deal found 9/19![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/82:49 pm -
1 stop19h 46m
Mon 10/125:53 pm -
1 stop17h 54m
Deal found 9/17![Frontier logo]()
$287
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.
Thu 11/129:59 pm -
1 stop20h 15m
Sun 11/151:28 pm -
1 stop25h 02m
Deal found 9/19![Frontier logo]()
$289
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.
Tue 9/228:30 am -
1 stop25h 02m
Mon 11/27:59 pm -
1 stop14h 05m
Deal found 9/21![Frontier logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:01 am -
1 stop9h 57m
Sat 10/107:42 pm -
1 stop14h 28m
Deal found 9/17![Frontier logo]()
$291
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 September 22, 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 September 22, 2026.
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:25 pm -
Nonstop2h 55m
Wed 10/211:45 pm -
1 stop6h 05m
Deal found 9/17![Southwest logo]()
$315
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:33 pm -
1 stop5h 03m
Tue 10/279:40 am -
1 stop7h 17m
Deal found 9/21![United Airlines logo]()
$357
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:45 am -
1 stop5h 47m
Thu 11/55:00 pm -
1 stop7h 43m
Deal found 9/20![Delta logo]()
$357
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.
Sat 10/246:45 pm -
Nonstop2h 55m
Mon 10/265:05 am -
Nonstop3h 25m
Deal found 9/22![Southwest logo]()
$337
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:45 am -
1 stop5h 47m
Tue 11/35:00 pm -
1 stop7h 43m
Deal found 9/20![Delta logo]()
$357
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.
Wed 12/239:00 pm -
Nonstop2h 50m
Fri 1/18:20 pm -
Nonstop3h 20m
Deal found 9/21![Southwest logo]()
$353
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:45 pm -
2 stops12h 08m
Tue 11/109:40 am -
2 stops12h 45m
Deal found 9/17![United Airlines logo]()
$426
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:25 pm -
Nonstop2h 55m
Mon 10/196:20 pm -
1 stop6h 10m
Deal found 9/17![Southwest logo]()
$356
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.
Thu 11/1912:00 pm -
1 stop4h 25m
Fri 11/279:45 pm -
Nonstop3h 30m
Deal found 9/21![Southwest logo]()
$359
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/175:20 pm -
1 stop5h 16m
Tue 3/232:15 pm -
1 stop6h 11m
Deal found 9/17![Delta logo]()
$465
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/151:35 pm -
Nonstop2h 50m
Tue 12/299:45 pm -
Nonstop3h 25m
Deal found 9/19![Southwest logo]()
$396
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/265:10 am -
Nonstop2h 50m
Wed 12/309:45 pm -
Nonstop3h 25m
Deal found 9/19![Southwest logo]()
$468
Last-minute flights from Phoenix to St. LouisDiscover last-minute flight deals from Phoenix to St. Louis. Data last updated September 22, 2026 and is based on user searches.
Discover last-minute flight deals from Phoenix to St. Louis. Data last updated September 22, 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.
Tue 9/228:30 am -
1 stop25h 02m
Mon 11/27:59 pm -
1 stop14h 05m
Deal found 9/21![Frontier logo]()
$290
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.
Tue 10/68:56 pm -
1 stop20h 21m
Mon 10/126:35 pm -
2 stops17h 12m
Deal found 9/18![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:21 pm -
1 stop6h 38m
Mon 10/126:35 pm -
2 stops17h 12m
Deal found 9/17![Frontier logo]()
$283
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.
Wed 10/79:15 am -
1 stop12h 44m
Sat 10/107:42 pm -
1 stop14h 28m
Deal found 9/18![Frontier logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/82:49 pm -
1 stop19h 46m
Mon 10/125:53 pm -
1 stop17h 54m
Deal found 9/17![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:01 am -
1 stop9h 57m
Sat 10/107:42 pm -
1 stop14h 28m
Deal found 9/17![Frontier logo]()
$291
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:16 am -
2 stops8h 41m
Fri 10/168:00 pm -
1 stop14h 10m
Deal found 9/20![Frontier logo]()
$279
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/109:15 am -
1 stop7h 42m
Mon 10/196:35 pm -
2 stops21h 07m
Deal found 9/20![Frontier logo]()
$281
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:50 pm -
1 stop5h 55m
Tue 10/206:20 am -
Nonstop3h 20m
Deal found 9/17![Southwest logo]()
$289
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.
Mon 10/266:00 am -
2 stops11h 15m
Mon 11/26:44 pm -
2 stops20h 01m
Deal found 9/21![Frontier logo]()
$280
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 September 22, 2026.
Search for one-way flight options from Phoenix to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 22, 2026.
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:15 am -
1 stop7h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$82
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.
Tue 10/208:51 pm -
1 stop16h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$87
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.
Wed 11/1810:09 am -
1 stop23h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$88
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:15 am -
1 stop6h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$94
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/173:46 pm -
1 stop22h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$97
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:30 am -
2 stops9h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$109
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 September 22, 2026.
Round-trip from | $278 (Mytrip) |
|---|---|
One-way from | $82 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $392 |
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 7,457,451 searches. Data last updated September 22, 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 Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Mon 10/12
8:25 pm-1:20 am
Nonstop2h 55m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$166
Quickest round-trip
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Thu 11/19
5:45 am-9:35 am
Nonstop2h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Tue 11/17
5:45 am-9:35 am
Nonstop2h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Mon 10/19
5:10 am-10:00 am
Nonstop2h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Thu 10/22
5:10 am-10:00 am
Nonstop2h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Fri 10/23
8:25 pm-1:20 am
Nonstop2h 55m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$181
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Fri 10/16
6:30 pm-11:25 pm
Nonstop2h 55m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$185
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Tue 12/15
9:10 am-10:59 pm
2 stops12h 49m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$200
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Sat 3/20
5:05 am-9:55 am
Nonstop2h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$223
PhoenixSt. Louis
PHX Phoenix Sky Harbor Intl - STL Lambert-St Louis
PHXSTL
Phoenix Sky Harbor Intl
Thu 10/15
8:25 pm-1:20 am
Nonstop2h 55m
Lambert-St Louis
Wed 10/21
1:45 pm-5:50 pm
1 stop6h 05m
$315
Showing 1-10 of 21 resultsSorted by cheapest first
Best time to book a flight from Phoenix to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Phoenix with our price prediction graph.
PH1-STL
PHX-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Phoenix to St. Louis
PH1-STL
PHX-STL
What is the cheapest month to book a flight from Phoenix to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $309). Flying from Phoenix to St. Louis in June is currently the most expensive (average of $453). 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 September 22, 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 17% on your trip compared to booking a flight at noon.
How much does it cost to fly round-trip from Phoenix to St. Louis?
Airfare is below average for this route at the moment.
Phoenix to St. Louis flights typically cost between $288 and $434 in October.The cheapest round-trip price found within the last 5 days was $279 on Frontier (Oct 10-Oct 16).
How far ahead should I book a flight from Phoenix to St. Louis?
To ensure you get the cheapest price possible for a flight from Phoenix to St. Louis, you should look to book at least 9 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest day to fly from Phoenix to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Phoenix to St. Louis. Price data was last updated on September 19, 2026.
Travelers seeking maximum savings on their Phoenix to St. Louis flight should consider departing on Friday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated September 22, 2026.
Get a feel of what it's like to fly with Southwest,American Airlines, andFrontier from Phoenix to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
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 locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Wentzville
Maryland Heights
Collinsville
Edwardsville
Glencoe
Chesterfield
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| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$244 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$396 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$296 | Average$429 | FlexibilityNo cancel fee | On-time63% |