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$48+ 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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 Tuesday and return on a Tuesday

Find flight deals from St. Louis to Phoenix

Cheapest flights from St. Louis to Phoenix
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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/29. 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 11/283:53 pmSTL - PHX
Nonstop3h 33mFrontier
Fri 12/510:26 pmPHX - STL
1 stop10h 48mFrontier
Deal found 10/29$147
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 11/283:53 pmSTL - PHX
Nonstop3h 33mFrontier
Wed 12/37:43 pmPHX - STL
1 stop15h 29mFrontier
Deal found 10/29$148
This Frontier deal was found by Cheapflights users on 10/29. 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 11/132:42 pmSTL - PHX
1 stop9h 47mFrontier
Mon 11/177:01 amPHX - STL
1 stop12h 11mFrontier
Deal found 10/29$150
This CheapOair deal was found by Cheapflights users on 10/29. 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.
Wed 12/107:43 pmSTL - PHX
1 stop13h 23mFrontier
Fri 12/127:25 amPHX - STL
Nonstop2h 57mFrontier
Deal found 10/29$152
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/13:53 pmSTL - PHX
Nonstop3h 33mFrontier
Wed 12/34:32 pmPHX - STL
2 stops17h 35mFrontier
Deal found 10/29$155
This Frontier deal was found by Cheapflights users on 10/28. 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 11/167:02 pmSTL - PHX
1 stop6h 11mFrontier
Mon 11/177:25 amPHX - STL
Nonstop2h 59mFrontier
Deal found 10/28$156
This Frontier deal was found by Cheapflights users on 10/28. 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 11/1712:09 pmSTL - PHX
Nonstop3h 22mFrontier
Fri 11/2111:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 10/28$158
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/57:43 pmSTL - PHX
1 stop13h 23mFrontier
Tue 12/94:32 pmPHX - STL
1 stop16h 42mFrontier
Deal found 10/29$159
This Priceline deal was found by Cheapflights users on 10/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1012:09 pmSTL - PHX
Nonstop3h 22mFrontier
Sat 11/158:00 amPHX - STL
1 stop6h 56mFrontier
Deal found 10/29$161
This CheapOair deal was found by Cheapflights users on 10/29. 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.
Thu 11/137:45 pmSTL - PHX
1 stop13h 39mFrontier
Sun 11/169:35 amPHX - STL
1 stop27h 22mFrontier
Deal found 10/29$162

Cheap 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 October 30, 2025.

Round-trip from

$145
(Kiwi.com)

One-way from

$48
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$333
From Lambert-St Louis to Phoenix
Search Deals
One-way flight from Lambert-St Louis to Phoenix
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 30, 2025.
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

Mon 11/10

5:20 am-7:45 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Fri 11/14

6:30 am-10:20 am

Nonstop2h 50m

$213

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 11/18

10:25 am-3:05 pm

1 stop5h 40m

Phoenix Sky Harbor Intl

Wed 11/19

6:30 pm-10:20 pm

Nonstop2h 50m

$223

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 12/6

5:50 pm-8:15 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Mon 12/8

4:40 pm-8:30 pm

Nonstop2h 50m

$255

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 11/10

5:20 am-7:45 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Sat 11/15

6:20 pm-10:10 pm

Nonstop2h 50m

$262

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 11/17

5:25 pm-7:50 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Wed 11/19

8:25 am-12:20 pm

Nonstop2h 55m

$266

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 11/2

5:20 am-7:45 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Mon 11/10

6:30 am-10:20 am

Nonstop2h 50m

$322

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 12/2

5:25 pm-7:50 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Sun 12/7

5:25 pm-12:05 am

1 stop5h 40m

$323

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/29

6:34 am-1:08 pm

1 stop7h 34m

Phoenix Sky Harbor Intl

Tue 12/9

12:12 pm-1:01 am

2 stops11h 49m

$326

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 1/25

9:40 am-3:15 pm

2 stops6h 35m

Phoenix Sky Harbor Intl

Wed 1/28

12:05 pm-5:10 pm

1 stop4h 05m

$331

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 12/4

2:20 pm-11:51 pm

2 stops10h 31m

Phoenix Sky Harbor Intl

Tue 12/9

12:12 pm-1:01 am

2 stops11h 49m

$340

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 23 results
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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.
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

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 October 24, 2025.

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 $121). Flying from St. Louis to Phoenix in June is currently the most expensive (average of $235). 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 October 30, 2025.

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 56% versus a flight at noon.

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 December 16, 2024.

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. Saturday 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 St. Louis to Phoenix?

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 October 30, 2025.
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.
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
7,998 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,998 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,035 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,122 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Phoenix. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Phoenix?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Phoenix from St. Louis. Booking flights from Lambert-St Louis (STL) to Phoenix should be relatively easy as there are 2 daily outbound flights to Phoenix from 6 different airlines.

  • How long is the flight from St. Louis to Phoenix?

    Airlines like Southwest fly from St. Louis to Phoenix in about 3h 25m. The time it takes to get you to your destination is usually consistent. The distance from St. Louis to Phoenix is about 1258 mi. Most flights are nonstop.

  • What are the cheapest airlines flying from St. Louis to Phoenix round-trip?

    Currently priced at $99, Frontier will fly you from St. Louis to Phoenix and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Spirit Airlines and Delta - these airlines can fly you to your destination from $158 and $236, respectively. These flights start at 74% lower than the current average price 3 months from now.

  • What are the most reliable airlines from St. Louis to Phoenix?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Phoenix consider choosing SkyWest Airlines (100%), Southwest (76%) or Alaska Airlines (72%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Phoenix?

    While on average a flight from St. Louis to Phoenix is generally $416, our data shows the cheapest flight currently is $79. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $134 for that flight.

  • Can I find deals for flights from St. Louis to Phoenix that include hotel bookings?

    Yes. In addition to deals on St. Louis to Phoenix flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Phoenix?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Phoenix.

  • Can I find deals for business class flights from St. Louis to Phoenix?

    Yes. Cheapflights offers flight deals from St. Louis to Phoenix by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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 $121). Flying from St. Louis to Phoenix in June is currently the most expensive (average of $235). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$99Average$207FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
DeltaCheapest$236Average$357FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$243Average$400FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$251Average$419FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$294Average$391FlexibilityNo cancel feeOn-time69%

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