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$66+ 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 11/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Phoenix are usually found in August or November, booked 69 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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 September 15, 2025.

Round-trip from

$158
(Kiwi.com)

One-way from

$66
(Cheapflightsfares)

Popular in

March

Cheapest in

August

Average price

$366
From Lambert-St Louis to Phoenix
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One-way flight from Lambert-St Louis to Phoenix
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Highest demand for flights based on searches. 7% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 15, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:45 pmSTL - PHX
1 stop5h 44mFrontier
Mon 11/107:25 amPHX - STL
Nonstop2h 59mFrontier
Deal found 9/15$150
This Cheapflightsfares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1010:59 pmSTL - PHX
Nonstop3h 22mFrontier
Mon 10/132:27 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 9/15$151
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/274:58 pmSTL - PHX
1 stop7h 51mFrontier
Sun 9/286:00 amPHX - STL
1 stop25h 06mFrontier
Deal found 9/15$152
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/127:52 pmSTL - PHX
1 stop14h 07mFrontier
Mon 10/139:59 pmPHX - STL
1 stop9h 08mFrontier
Deal found 9/15$153
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/1710:59 pmSTL - PHX
Nonstop3h 22mFrontier
Sun 10/198:03 pmPHX - STL
1 stop13h 40mFrontier
Deal found 9/15$155
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/157:52 pmSTL - PHX
1 stop14h 07mFrontier
Fri 10/179:59 pmPHX - STL
1 stop9h 08mFrontier
Deal found 9/15$158
This CheapOair deal was found by Cheapflights users on 9/14. 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 10/227:52 pmSTL - PHX
1 stop24h 29mFrontier
Sat 10/254:41 pmPHX - STL
1 stop14h 41mFrontier
Deal found 9/14$163
This Trip.com deal was found by Cheapflights users on 9/13. 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.
Sat 9/204:58 pmSTL - PHX
1 stop7h 51mFrontier
Tue 9/238:00 amPHX - STL
1 stop23h 06mFrontier
Deal found 9/13$166
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/191:41 pmSTL - PHX
1 stop25h 36mFrontier
Fri 10/245:15 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 9/14$168
This Frontier deal was found by Cheapflights users on 9/15. 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 9/257:55 pmSTL - PHX
1 stop5h 32mFrontier
Mon 9/298:20 pmPHX - STL
1 stop10h 46mFrontier
Deal found 9/15$171
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/184:51 pmSTL - PHX
1 stop8h 50mFrontier
Sun 10/199:27 amPHX - STL
1 stop24h 16mFrontier
Deal found 9/15$173

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 September 15, 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

Wed 10/15

7:52 pm-7:59 am

1 stop14h 07m

Phoenix Sky Harbor Intl

Fri 10/17

4:55 pm-9:07 am

2 stops14h 12m

$203

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/14

5:20 pm-9:15 pm

1 stop5h 55m

Phoenix Sky Harbor Intl

Tue 10/28

7:35 pm-12:30 am

Nonstop2h 55m

$219

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 11/6

7:40 pm-12:38 am

1 stop5h 58m

Phoenix Sky Harbor Intl

Mon 11/10

12:59 am-8:55 am

1 stop6h 56m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 10/25

5:30 pm-9:35 pm

1 stop6h 05m

Phoenix Sky Harbor Intl

Tue 10/28

12:40 am-8:51 am

1 stop6h 11m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 10/19

1:41 pm-1:17 pm

1 stop25h 36m

Phoenix Sky Harbor Intl

Fri 10/24

11:24 pm-9:22 am

2 stops31h 58m

$238

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 11/14

12:09 pm-2:31 pm

Nonstop3h 22m

Phoenix Sky Harbor Intl

Fri 11/21

11:14 am-3:08 pm

Nonstop2h 54m

$249

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/22

7:25 pm-9:50 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Thu 11/27

2:40 pm-6:30 pm

Nonstop2h 50m

$253

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 10/30

5:15 am-6:35 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Sun 11/2

8:05 am-2:30 pm

1 stop5h 25m

$283

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 10/13

7:30 pm-11:38 pm

1 stop6h 08m

Phoenix Sky Harbor Intl

Fri 10/17

12:40 am-8:51 am

1 stop6h 11m

$288

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/1

5:30 pm-9:35 pm

1 stop6h 05m

Phoenix Sky Harbor Intl

Wed 11/5

12:59 am-8:37 am

1 stop6h 38m

$308

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 19 results
1
2

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 September 12, 2025.

The best time to book flights from St. Louis to Phoenix is 69 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, January is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $258). Flying from St. Louis to Phoenix in March is currently the most expensive (average of $337). 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 September 15, 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 at noon, which can drop the price by up to 13% 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 December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Phoenix flight should consider departing on Wednesday at noon 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.

Weekly flight availability from St. Louis to Phoenix

Explore weekly flight availability from St. Louis to Phoenix. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 15, 2025.

The most flights from STL to PH1 are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).

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 September 15, 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
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

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
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

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
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

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
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

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 6 daily outbound flights to Phoenix from 6 different airlines.

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

    Airlines like Frontier, Southwest, and Delta fly from St. Louis to Phoenix in about 5h 55m. The time it takes to get you to your destination can typically vary by up to 8h 12m. The distance from St. Louis to Phoenix is about 1258 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $106, 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 73% 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 (75%), Southwest (69%) or American Airlines (60%) 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 $302, our data shows the cheapest flight currently is $103. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $139 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, January is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $258). Flying from St. Louis to Phoenix in March is currently the most expensive (average of $337). 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

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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$207FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
DeltaCheapest$236Average$357FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$262Average$415FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$275Average$436FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$294Average$392FlexibilityNo cancel feeOn-time69%

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