$58+ 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 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Mar 10 — Mar 171
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 October, booked 87 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 February 8, 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 February 8, 2026.
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/139:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Fri 2/276:00 am
PHX
- STL
1 stop6h 09m
Frontier
Deal found 2/6![Frontier logo]()
$151
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.
Sat 2/282:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Wed 3/46:00 am
PHX
- STL
1 stop8h 53m
Frontier
Deal found 2/6![Frontier logo]()
$152
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.
Fri 2/209:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Wed 2/259:52 am
PHX
- STL
1 stop5h 01m
Frontier
Deal found 2/6![Frontier logo]()
$154
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.
Fri 2/279:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/7![Frontier logo]()
$155
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Thu 3/125:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/5![Frontier logo]()
$156
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 2/209:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 2/248:04 pm
PHX
- STL
2 stops18h 49m
Frontier
Deal found 2/5![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/4. 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 3/104:51 pm
STL
- PHX
1 stop8h 53m
Frontier
Sun 3/155:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/4![Frontier logo]()
$163
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.
Mon 3/28:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Mon 3/168:04 pm
PHX
- STL
2 stops35h 45m
Frontier
Deal found 2/7![Frontier logo]()
$166
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Thu 3/510:51 pm
PHX
- STL
1 stop9h 58m
Frontier
Deal found 2/5![Frontier logo]()
$168
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 February 8, 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 February 8, 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.
Sun 3/298:06 pm
STL
- PHX
1 stop16h 27m
Frontier
Tue 4/76:52 pm
PHX
- STL
1 stop12h 56m
Frontier
Deal found 2/7![Frontier logo]()
$180
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.
Sat 5/24:45 pm
STL
- PHX
Nonstop3h 20m
Southwest
Wed 5/65:35 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/7![Southwest logo]()
$287
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.
Sat 2/142:51 pm
STL
- PHX
1 stop10h 08m
Frontier
Wed 2/188:04 pm
PHX
- STL
1 stop24h 22m
Frontier
Deal found 2/7![Frontier logo]()
$232
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/74:45 pm
STL
- PHX
1 stop7h 15m
Southwest
Sat 3/149:05 pm
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/6![Southwest logo]()
$300
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 3/252:25 pm
STL
- PHX
Nonstop3h 30m
Southwest
Wed 4/14:45 pm
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/7![Southwest logo]()
$315
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.
Sat 3/76:00 am
STL
- PHX
Nonstop3h 35m
Southwest
Wed 3/114:45 pm
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/7![Southwest logo]()
$319
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/145:40 pm
STL
- PHX
1 stop6h 00m
Southwest
Tue 4/2111:10 am
PHX
- STL
1 stop4h 45m
Southwest
Deal found 2/6![Southwest logo]()
$330
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/212:05 pm
STL
- PHX
Nonstop3h 25m
Southwest
Fri 4/245:15 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/5![Southwest logo]()
$335
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/37:30 pm
STL
- PHX
Nonstop3h 30m
Southwest
Tue 4/76:20 pm
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 2/6![Southwest logo]()
$335
This Southwest deal was found by Cheapflights users on 2/4. 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 4/145:35 pm
STL
- PHX
Nonstop3h 25m
Southwest
Fri 4/175:15 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/4![Southwest logo]()
$335
Last-minute flights from St. Louis to PhoenixDiscover last-minute flight deals from St. Louis to Phoenix. Data last updated February 8, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Phoenix. Data last updated February 8, 2026 and is based on user searches.
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/139:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Fri 2/276:00 am
PHX
- STL
1 stop6h 09m
Frontier
Deal found 2/6![Frontier logo]()
$151
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.
Fri 2/209:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Wed 2/259:52 am
PHX
- STL
1 stop5h 01m
Frontier
Deal found 2/6![Frontier logo]()
$154
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 2/209:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 2/248:04 pm
PHX
- STL
2 stops18h 49m
Frontier
Deal found 2/5![Frontier logo]()
$161
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.
Fri 2/279:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Mon 3/23:59 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/7![Frontier logo]()
$155
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Thu 3/510:51 pm
PHX
- STL
1 stop9h 58m
Frontier
Deal found 2/5![Frontier logo]()
$168
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.
Sat 2/282:51 pm
STL
- PHX
1 stop7h 50m
Frontier
Wed 3/46:00 am
PHX
- STL
1 stop8h 53m
Frontier
Deal found 2/6![Frontier logo]()
$152
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.
Mon 3/28:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Mon 3/168:04 pm
PHX
- STL
2 stops35h 45m
Frontier
Deal found 2/7![Frontier logo]()
$166
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Thu 3/125:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/5![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 2/4. 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 3/104:51 pm
STL
- PHX
1 stop8h 53m
Frontier
Sun 3/155:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/4![Frontier logo]()
$163
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 February 8, 2026.
Search for one-way flight options from St. Louis to Phoenix. Find affordable one-way fares based on user searches. Data last updated February 8, 2026.
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.
Fri 2/209:02 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/8![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Sat 4/41:06 pm
STL
- PHX
Nonstop3h 35m
Frontier
Deal found 2/4![Frontier logo]()
$63
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.
Sat 3/78:12 pm
STL
- PHX
1 stop22h 34m
Frontier
Deal found 2/5![Frontier logo]()
$66
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.
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/7![Frontier logo]()
$69
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.
Mon 3/21:54 pm
STL
- PHX
1 stop8h 35m
Frontier
Deal found 2/7![Frontier logo]()
$73
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.
Mon 4/68:16 pm
STL
- PHX
1 stop23h 31m
Frontier
Deal found 2/8![Frontier logo]()
$77
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 3/68:12 pm
STL
- PHX
1 stop19h 49m
Frontier
Deal found 2/6![Frontier logo]()
$78
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/78:12 pm
STL
- PHX
1 stop13h 24m
Frontier
Deal found 2/8![Frontier logo]()
$81
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.
Fri 5/88:12 pm
STL
- PHX
1 stop14h 26m
Frontier
Deal found 2/8![Frontier logo]()
$84
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 February 8, 2026.
Round-trip from | $151 (Super.com) |
|---|---|
One-way from | $58 (Kiwi.com) |
Popular in | March |
Cheapest in | November |
Average price | $372 |
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 February 8, 2026.
Use the filters below to find and compare flights from St. Louis to Phoenix that are best for you.
Fly from
St. Louis
Fly to
Phoenix
Route
Depart
Return
Price
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sun 3/29
8:06 pm-10:33 am
1 stop16h 27m
Phoenix Sky Harbor Intl
Tue 4/7
6:52 pm-9:48 am
1 stop12h 56m
$180
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 2/14
2:51 pm-11:59 pm
1 stop10h 08m
Phoenix Sky Harbor Intl
Wed 2/18
8:04 pm-9:26 pm
1 stop24h 22m
$232
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 5/2
4:45 pm-6:05 pm
Nonstop3h 20m
Phoenix Sky Harbor Intl
Wed 5/6
5:35 am-10:25 am
Nonstop2h 50m
$287
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 3/7
4:45 pm-11:00 pm
1 stop7h 15m
Phoenix Sky Harbor Intl
Sat 3/14
9:05 pm-1:55 am
Nonstop2h 50m
$300
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 3/25
2:25 pm-3:55 pm
Nonstop3h 30m
Phoenix Sky Harbor Intl
Wed 4/1
4:45 pm-9:35 pm
Nonstop2h 50m
$315
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 3/7
6:00 am-8:35 am
Nonstop3h 35m
Phoenix Sky Harbor Intl
Wed 3/11
4:45 pm-9:35 pm
Nonstop2h 50m
$319
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 4/14
5:40 pm-9:40 pm
1 stop6h 00m
Phoenix Sky Harbor Intl
Tue 4/21
11:10 am-5:55 pm
1 stop4h 45m
$330
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 4/21
2:05 pm-3:30 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Fri 4/24
5:15 am-10:05 am
Nonstop2h 50m
$335
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 4/3
7:30 pm-9:00 pm
Nonstop3h 30m
Phoenix Sky Harbor Intl
Tue 4/7
6:20 pm-11:15 pm
Nonstop2h 55m
$335
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 4/14
5:35 pm-7:00 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Fri 4/17
5:15 am-10:05 am
Nonstop2h 50m
$335
Showing 1-10 of 21 results
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
How far ahead should I book a flight from St. Louis to Phoenix?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Phoenix. Price data was last updated on January 30, 2026.
The best time to book flights from St. Louis to Phoenix is 87 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 month to book a flight from St. Louis to Phoenix?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $107). Flying from St. Louis to Phoenix in June is currently the most expensive (average of $234). 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 February 8, 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 23% versus a flight in the morning.
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 January 31, 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 evenings 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 February 8, 2026.
Peruse reviews from past customers who have flown with Southwest, Delta, and United 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.
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
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St. Louis and Phoenix flights
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Top 6 airlines flying from St. Louis to Phoenix
Discover the top 6 airlines that operate flights from St. Louis to Phoenix. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$91 | Average$199 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$121 | Average$200 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$141 | Average$357 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$148 | Average$383 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$211 | Average$383 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$221 | Average$396 | FlexibilityNo cancel fee | On-time63% |