$61+ 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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Mar 11 — Mar 181
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
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 February 9, 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 February 9, 2026.
This Frontier deal was found by Cheapflights users on 2/9. 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.
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/9![Frontier logo]()
$128
This Expedia deal was found by Cheapflights users on 2/7. 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 2/274:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Mon 3/21:54 pm
STL
- PHX
1 stop8h 35m
Frontier
Deal found 2/7![Frontier logo]()
$133
This Super.com deal was found by Cheapflights users on 2/8. 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.
Sun 3/85:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/1510:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/8![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 3/610:24 pm
PHX
- STL
1 stop10h 25m
Frontier
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/5![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 4/117:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Mon 4/138:16 pm
STL
- PHX
1 stop17h 30m
Frontier
Deal found 2/8![Frontier logo]()
$139
This Frontier deal was found by Cheapflights users on 2/8. 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 2/274:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sat 2/282:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Deal found 2/8![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 2/204:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Wed 2/254:51 pm
STL
- PHX
1 stop8h 08m
Frontier
Deal found 2/6![Frontier logo]()
$157
This Frontier deal was found by Cheapflights users on 2/6. 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 2/256:00 am
PHX
- STL
1 stop8h 53m
Frontier
Sat 2/282:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Deal found 2/6![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 4/189:52 am
PHX
- STL
1 stop7h 20m
Frontier
Tue 4/214:55 pm
STL
- PHX
1 stop8h 23m
Frontier
Deal found 2/8![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 4/146:50 am
PHX
- STL
2 stops22h 00m
Frontier
Mon 4/208:12 pm
STL
- PHX
1 stop17h 34m
Frontier
Deal found 2/8![Frontier logo]()
$168
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 February 9, 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 February 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 2/2710:39 pm
PHX
- STL
1 stop14h 17m
Frontier
Mon 3/210:11 pm
STL
- PHX
2 stops11h 31m
Frontier
Deal found 2/7![Frontier logo]()
$212
This Southwest deal was found by Cheapflights users on 2/8. 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 4/186:40 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 4/212:05 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 2/8![Southwest logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 3/155:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Wed 3/1811:32 am
STL
- PHX
2 stops11h 42m
Frontier
Deal found 2/6![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 2/1910:51 pm
PHX
- STL
1 stop13h 18m
Frontier
Sat 2/212:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Deal found 2/6![Frontier logo]()
$282
This Southwest deal was found by Cheapflights users on 2/7. 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 7/85:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 7/146:10 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 2/7![Southwest logo]()
$315
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 3/159:24 pm
PHX
- STL
1 stop10h 25m
Frontier
Thu 3/198:06 pm
STL
- PHX
2 stops22h 21m
Frontier
Deal found 2/8![Frontier logo]()
$283
This Southwest deal was found by Cheapflights users on 2/8. 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 6/165:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Wed 6/176:10 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 2/8![Southwest logo]()
$315
This Frontier deal was found by Cheapflights users on 2/7. 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 3/195:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Mon 3/238:12 pm
STL
- PHX
1 stop5h 46m
Frontier
Deal found 2/7![Frontier logo]()
$283
This Frontier deal was found by Cheapflights users on 2/6. 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.
Mon 3/2312:08 pm
PHX
- STL
Nonstop2h 53m
Frontier
Wed 3/254:51 pm
STL
- PHX
1 stop8h 53m
Frontier
Deal found 2/6![Frontier logo]()
$283
This CheapOair deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1012:59 am
PHX
- STL
1 stop20h 20m
Frontier
Mon 3/168:12 pm
STL
- PHX
1 stop5h 46m
Frontier
Deal found 2/9![Frontier logo]()
$286
Last-minute flights from Phoenix to St. LouisDiscover last-minute flight deals from Phoenix to St. Louis. Data last updated February 9, 2026 and is based on user searches.
Discover last-minute flight deals from Phoenix to St. Louis. Data last updated February 9, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 2/7. 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.
Thu 2/199:30 am
PHX
- STL
1 stop10h 56m
Frontier
Mon 2/238:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/7![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 2/204:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Wed 2/254:51 pm
STL
- PHX
1 stop8h 08m
Frontier
Deal found 2/6![Frontier logo]()
$157
This Frontier deal was found by Cheapflights users on 2/6. 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 2/256:00 am
PHX
- STL
1 stop8h 53m
Frontier
Sat 2/282:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Deal found 2/6![Frontier logo]()
$159
This Expedia deal was found by Cheapflights users on 2/7. 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 2/274:14 pm
PHX
- STL
Nonstop2h 53m
Frontier
Mon 3/21:54 pm
STL
- PHX
1 stop8h 35m
Frontier
Deal found 2/7![Frontier logo]()
$133
This Frontier deal was found by Cheapflights users on 2/8. 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 2/276:00 am
PHX
- STL
1 stop6h 09m
Frontier
Fri 2/279:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/8![Frontier logo]()
$154
This Frontier deal was found by Cheapflights users on 2/9. 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.
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/9![Frontier logo]()
$128
This Frontier deal was found by Cheapflights users on 2/8. 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 3/49:52 am
PHX
- STL
1 stop5h 01m
Frontier
Sat 3/74:21 pm
STL
- PHX
1 stop9h 23m
Frontier
Deal found 2/8![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 3/610:24 pm
PHX
- STL
1 stop10h 25m
Frontier
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/5![Frontier logo]()
$137
This Super.com deal was found by Cheapflights users on 2/8. 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.
Sun 3/85:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Sun 3/1510:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/8![Frontier logo]()
$136
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 February 9, 2026.
Search for one-way flight options from Phoenix to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 9, 2026.
This Trip.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/610:24 pm
PHX
- STL
1 stop10h 25m
Frontier
Deal found 2/6![Frontier logo]()
$61
This Frontier deal was found by Cheapflights users on 2/7. 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 4/47:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Deal found 2/7![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 5/96:50 am
PHX
- STL
1 stop10h 22m
Frontier
Deal found 2/9![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 2/7. 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.
Sun 3/85:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/7![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 5/86:45 pm
PHX
- STL
1 stop22h 27m
Frontier
Deal found 2/7![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 5/66:45 pm
PHX
- STL
1 stop22h 27m
Frontier
Deal found 2/9![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 4/76:52 pm
PHX
- STL
1 stop12h 56m
Frontier
Deal found 2/7![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 3/243:11 pm
PHX
- STL
1 stop16h 38m
Frontier
Deal found 2/8![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 3/36:51 pm
PHX
- STL
1 stop20h 02m
Frontier
Deal found 2/6![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 5/78:52 am
PHX
- STL
1 stop8h 20m
Frontier
Deal found 2/9![Frontier logo]()
$88
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 February 9, 2026.
Round-trip from | $128 (Frontier) |
|---|---|
One-way from | $61 (Trip.com) |
Popular in | April |
Cheapest in | January |
Average price | $357 |
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 February 9, 2026.
Use the filters below to find and compare flights from Phoenix to St. Louis that are best for you.
Fly from
Phoenix
Fly to
St. Louis
Route
Depart
Return
Price
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 2/27
10:39 pm-1:56 pm
1 stop14h 17m
Lambert-St Louis
Mon 3/2
10:11 pm-8:42 am
2 stops11h 31m
$212
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sun 3/15
5:09 pm-10:02 pm
Nonstop2h 53m
Lambert-St Louis
Wed 3/18
11:32 am-9:14 pm
2 stops11h 42m
$246
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 2/19
10:51 pm-1:09 pm
1 stop13h 18m
Lambert-St Louis
Sat 2/21
2:51 pm-9:41 pm
1 stop7h 50m
$282
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sun 3/15
9:24 pm-9:49 am
1 stop10h 25m
Lambert-St Louis
Thu 3/19
8:06 pm-4:27 pm
2 stops22h 21m
$283
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 3/19
5:09 pm-10:02 pm
Nonstop2h 53m
Lambert-St Louis
Mon 3/23
8:12 pm-11:58 pm
1 stop5h 46m
$283
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Mon 3/23
12:08 pm-5:01 pm
Nonstop2h 53m
Lambert-St Louis
Wed 3/25
4:51 pm-11:44 pm
1 stop8h 53m
$283
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 3/10
12:59 am-11:19 pm
1 stop20h 20m
Lambert-St Louis
Mon 3/16
8:12 pm-11:58 pm
1 stop5h 46m
$286
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 4/18
6:40 am-11:30 am
Nonstop2h 50m
Lambert-St Louis
Tue 4/21
2:05 pm-3:30 pm
Nonstop3h 25m
$287
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 7/8
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Tue 7/14
6:10 am-7:20 am
Nonstop3h 10m
$315
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/16
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Wed 6/17
6:10 am-7:20 am
Nonstop3h 10m
$315
Showing 1-10 of 22 results
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 February 6, 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 $309). 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 February 9, 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 6% 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 February 7, 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.
How much does it cost to fly round-trip from Phoenix to St. Louis?
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 February 9, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and American 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.
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
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Phoenix and St. Louis flights
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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 February 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$229 | Average$389 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$346 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$258 | Average$394 | FlexibilityNo cancel fee | On-time63% |