$94+ 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Sep 5 — Sep 121
Round-trip
1 adult, Economy
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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 December, booked 16 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 August 6, 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 August 6, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 10/138:10 pm -
1 stop13h 01m
Tue 10/208:16 am -
1 stop8h 59m
Deal found 8/4![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 10/208:10 pm -
1 stop13h 01m
Fri 10/238:16 am -
1 stop8h 59m
Deal found 8/1![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 10/168:10 pm -
1 stop13h 01m
Mon 10/196:36 pm -
1 stop22h 39m
Deal found 8/2![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 10/28:10 pm -
1 stop13h 50m
Wed 10/79:15 am -
1 stop8h 02m
Deal found 8/2![Frontier logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 10/158:10 pm -
1 stop13h 01m
Mon 10/196:36 pm -
1 stop22h 39m
Deal found 8/1![Frontier logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/198:10 pm -
1 stop13h 50m
Tue 9/223:21 pm -
1 stop25h 56m
Deal found 8/3![Frontier logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/168:10 pm -
1 stop13h 50m
Wed 9/239:15 am -
1 stop8h 02m
Deal found 8/2![Frontier logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 10/128:10 pm -
1 stop13h 01m
Mon 10/196:36 pm -
1 stop22h 39m
Deal found 8/1![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 9/168:10 pm -
1 stop20h 07m
Wed 10/218:16 am -
1 stop8h 59m
Deal found 8/1![Frontier logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 10/910:35 am -
2 stops38h 40m
Fri 10/168:16 am -
1 stop8h 59m
Deal found 8/1![Frontier logo]()
$215
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 August 6, 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 August 6, 2026.
This Southwest deal was found by Cheapflights users on 8/1. 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 9/165:35 am -
1 stop6h 20m
Wed 10/215:00 am -
Nonstop2h 50m
Deal found 8/1![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 8/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:08 pm -
1 stop25h 27m
Wed 9/167:49 pm -
2 stops19h 21m
Deal found 8/3![Alaska Airlines logo]()
$425
This Southwest deal was found by Cheapflights users on 8/1. 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 10/248:25 am -
1 stop4h 45m
Mon 10/268:25 pm -
Nonstop2h 50m
Deal found 8/1![Southwest logo]()
$293
This Southwest deal was found by Cheapflights users on 8/2. 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 9/15:00 pm -
Nonstop3h 15m
Sun 9/612:05 pm -
Nonstop2h 55m
Deal found 8/2![Southwest logo]()
$315
This Southwest deal was found by Cheapflights users on 8/1. 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 10/208:50 pm -
Nonstop3h 15m
Fri 10/236:30 pm -
Nonstop2h 50m
Deal found 8/1![Southwest logo]()
$337
This Southwest deal was found by Cheapflights users on 8/3. 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 9/165:00 pm -
Nonstop3h 15m
Wed 9/236:00 am -
Nonstop2h 55m
Deal found 8/3![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 8/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:00 pm -
Nonstop3h 15m
Thu 9/35:00 am -
Nonstop2h 50m
Deal found 8/5![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 8/3. 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 8/318:45 pm -
Nonstop3h 10m
Mon 9/75:00 am -
Nonstop2h 50m
Deal found 8/3![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 8/4. 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 -
Nonstop3h 10m
Wed 9/28:20 am -
Nonstop2h 55m
Deal found 8/4![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 8/3. 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 9/198:25 am -
Nonstop3h 15m
Tue 9/225:40 pm -
Nonstop3h 00m
Deal found 8/3![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 8/4. 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 9/142:20 pm -
1 stop4h 30m
Tue 9/151:20 pm -
Nonstop3h 00m
Deal found 8/4![Southwest logo]()
$409
This Southwest deal was found by Cheapflights users on 8/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:00 am -
Nonstop3h 15m
Mon 9/75:00 am -
Nonstop2h 50m
Deal found 8/6![Southwest logo]()
$427
Last-minute flights from St. Louis to PhoenixDiscover last-minute flight deals from St. Louis to Phoenix. Data last updated August 6, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Phoenix. Data last updated August 6, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 8/247:58 pm -
1 stop5h 41m
Sat 9/59:10 am -
1 stop30h 12m
Deal found 8/3![Frontier logo]()
$228
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 8/306:17 pm -
2 stops29h 11m
Sun 9/68:35 am -
1 stop8h 38m
Deal found 8/1![Frontier logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/15:27 pm -
1 stop7h 33m
Sun 9/68:35 am -
1 stop8h 38m
Deal found 8/2![Frontier logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/15:27 pm -
1 stop7h 33m
Thu 9/108:56 pm -
1 stop20h 21m
Deal found 8/2![Frontier logo]()
$231
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/168:10 pm -
1 stop13h 50m
Wed 9/239:15 am -
1 stop8h 02m
Deal found 8/2![Frontier logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 9/168:10 pm -
1 stop20h 07m
Wed 10/218:16 am -
1 stop8h 59m
Deal found 8/1![Frontier logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/198:10 pm -
1 stop13h 50m
Tue 9/223:21 pm -
1 stop25h 56m
Deal found 8/3![Frontier logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/198:10 pm -
1 stop13h 50m
Mon 9/216:25 am -
1 stop10h 52m
Deal found 8/2![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/2710:20 am -
1 stop28h 46m
Wed 9/309:15 am -
1 stop8h 02m
Deal found 8/3![Frontier logo]()
$221
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 August 6, 2026.
Search for one-way flight options from St. Louis to Phoenix. Find affordable one-way fares based on user searches. Data last updated August 6, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/131:02 pm -
1 stop12h 41m
Deal found 8/2![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 9/15:27 pm -
1 stop7h 33m
Deal found 8/1![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 9/67:58 pm -
1 stop5h 41m
Deal found 8/4![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 10/28:10 pm -
1 stop13h 50m
Deal found 8/2![Frontier logo]()
$108
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/282:29 pm -
2 stops33h 21m
Deal found 8/2![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/308:10 pm -
1 stop13h 50m
Deal found 8/2![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 10/52:29 pm -
2 stops33h 21m
Deal found 8/2![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/317:58 pm -
1 stop5h 41m
Deal found 8/4![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 10/1910:35 am -
2 stops30h 47m
Deal found 8/1![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 9/46:17 pm -
1 stop26h 14m
Deal found 8/4![Frontier logo]()
$117
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 August 6, 2026.
Round-trip from | $193 (Kiwi.com) |
|---|---|
One-way from | $94 (Kiwi.com) |
Popular in | June |
Cheapest in | November |
Average price | $392 |
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 August 6, 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 Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Wed 9/16
5:35 am-9:55 am
1 stop6h 20m
Phoenix Sky Harbor Intl
Wed 10/21
5:00 am-9:50 am
Nonstop2h 50m
$287
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Sat 10/24
8:25 am-11:10 am
1 stop4h 45m
Phoenix Sky Harbor Intl
Mon 10/26
8:25 pm-1:15 am
Nonstop2h 50m
$293
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Tue 9/1
5:00 pm-6:15 pm
Nonstop3h 15m
Phoenix Sky Harbor Intl
Sun 9/6
12:05 pm-5:00 pm
Nonstop2h 55m
$315
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Tue 10/20
8:50 pm-10:05 pm
Nonstop3h 15m
Phoenix Sky Harbor Intl
Fri 10/23
6:30 pm-11:20 pm
Nonstop2h 50m
$337
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Wed 9/16
5:00 pm-6:15 pm
Nonstop3h 15m
Phoenix Sky Harbor Intl
Wed 9/23
6:00 am-10:55 am
Nonstop2h 55m
$403
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Mon 8/31
6:00 pm-7:15 pm
Nonstop3h 15m
Phoenix Sky Harbor Intl
Thu 9/3
5:00 am-9:50 am
Nonstop2h 50m
$403
Quickest round-trip
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Mon 8/31
8:45 pm-9:55 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Mon 9/7
5:00 am-9:50 am
Nonstop2h 50m
$403
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Tue 9/1
8:45 pm-9:55 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Wed 9/2
8:20 am-1:15 pm
Nonstop2h 55m
$403
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Sat 9/19
8:25 am-9:40 am
Nonstop3h 15m
Phoenix Sky Harbor Intl
Tue 9/22
5:40 pm-10:40 pm
Nonstop3h 00m
$403
St. LouisPhoenix
STL Lambert-St Louis - PHX Phoenix Sky Harbor Intl
STLPHX
Lambert-St Louis
Mon 9/14
2:20 pm-4:50 pm
1 stop4h 30m
Phoenix Sky Harbor Intl
Tue 9/15
1:20 pm-6:20 pm
Nonstop3h 00m
$409
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, November is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $309). Flying from St. Louis to Phoenix in June is currently the most expensive (average of $429). 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 August 6, 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.
How much does it cost to fly round-trip from St. Louis to Phoenix?
Airfare is below average for this route at the moment.
St. Louis to Phoenix flights typically cost between $353 and $434 in October.The cheapest round-trip price found within the last 5 days was $193 on Frontier (Oct 13-Oct 20).
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 15 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 August 1, 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 afternoons 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 August 6, 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.
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Related info for your journey
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St. Louis and Phoenix flights
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Top 5 airlines flying from St. Louis to Phoenix
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| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$211 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$381 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$214 | Average$383 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$233 | Average$403 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$380 | FlexibilityNo cancel fee | On-time62% |