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$64+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Phoenix are usually found in July or August, booked 76 days in advance, depart on a Wednesday or Saturday 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 June 12, 2025.

Round-trip from

$223
(FlightHub)

One-way from

$64
(Booking.com)

Popular in

March

Cheapest in

July

Average price

$342
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. 15% potential increase in price ($67 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/127:29 pmSTL - PHX
1 stop14h 58mMultiple Airlines
Wed 7/1611:34 pmPHX - STL
1 stop8h 18mMultiple Airlines
Deal found 6/10$223
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/296:36 pmSTL - PHX
1 stop27h 45mSpirit Airlines
Thu 7/39:46 pmPHX - STL
1 stop17h 18mSpirit Airlines
Deal found 6/11$224
This Frontier deal was found by Cheapflights users on 6/11. 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 8/287:54 pmSTL - PHX
1 stop5h 30mFrontier
Mon 9/19:19 pmPHX - STL
1 stop9h 52mFrontier
Deal found 6/11$256
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/178:09 amSTL - PHX
Nonstop3h 30mAmerican Airlines
Thu 11/207:50 pmPHX - STL
Nonstop2h 59mAmerican Airlines
Deal found 6/11$257
This Southwest deal was found by Cheapflights users on 6/10. 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 12/1112:00 pmSTL - PHX
1 stop6h 25mSouthwest
Tue 12/1612:05 pmPHX - STL
1 stop4h 10mSouthwest
Deal found 6/10$272
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:59 pmSTL - PHX
1 stop6h 42mDelta
Mon 11/1012:59 amPHX - STL
1 stop6h 45mDelta
Deal found 6/11$277
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/158:54 amSTL - PHX
2 stops8h 15mUnited Airlines
Tue 7/221:35 pmPHX - STL
1 stop5h 10mUnited Airlines
Deal found 6/10$340
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
Fri 10/173:57 pmSTL - PHX
1 stop20h 08mAlaska Airlines
Tue 10/216:00 amPHX - STL
2 stops15h 59mAlaska Airlines
Deal found 6/10$389

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 June 12, 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

Sat 7/12

7:29 pm-8:27 am

1 stop14h 58m

Phoenix Sky Harbor Intl

Wed 7/16

11:34 pm-9:52 am

1 stop8h 18m

$223

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 6/29

6:36 pm-8:21 pm

1 stop27h 45m

Phoenix Sky Harbor Intl

Thu 7/3

9:46 pm-5:04 pm

1 stop17h 18m

$224

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 8/28

7:54 pm-11:24 pm

1 stop5h 30m

Phoenix Sky Harbor Intl

Mon 9/1

9:19 pm-9:11 am

1 stop9h 52m

$256

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 11/17

8:09 am-10:39 am

Nonstop3h 30m

Phoenix Sky Harbor Intl

Thu 11/20

7:50 pm-11:49 pm

Nonstop2h 59m

$257

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 10/16

7:35 pm-11:05 pm

1 stop5h 30m

Phoenix Sky Harbor Intl

Tue 10/21

2:40 pm-10:05 pm

1 stop5h 25m

$276

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 11/6

6:59 pm-12:41 am

1 stop6h 42m

Phoenix Sky Harbor Intl

Mon 11/10

12:59 am-8:44 am

1 stop6h 45m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 7/15

8:54 am-3:09 pm

2 stops8h 15m

Phoenix Sky Harbor Intl

Tue 7/22

1:35 pm-8:45 pm

1 stop5h 10m

$340

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

3:57 pm-10:05 am

1 stop20h 08m

Phoenix Sky Harbor Intl

Tue 10/21

6:00 am-11:59 pm

2 stops15h 59m

$389

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 9/8

8:44 am-2:11 pm

1 stop7h 27m

$64

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/10

6:15 am-7:30 am

Nonstop3h 15m

$128

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 16 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 June 9, 2025.

The best time to book flights from St. Louis to Phoenix is 76 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 June 12, 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 afternoon, which can drop the price by up to 11% 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 afternoons 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.

Rainfall in Phoenix by month

Plan your trip to Phoenix by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Phoenix ranges from 0.0 - 1.1 inches per month. July is typically the wettest month, when rainfall can reach 1.1 in. June is typically the driest time to visit Phoenix when rainfall is around 0.0 in.

Temperature in Phoenix by month

Plan your trip to Phoenix by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Phoenix, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 95.0 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 55.4 F).

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 June 12, 2025.
To help decide which airline to fly from St. Louis to Phoenix, see what other customers have to say about Alaska Airlines, Southwest and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 7 daily outbound flights to Phoenix from 5 different airlines.

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

    Currently priced at $224, Spirit Airlines will fly you from St. Louis to Phoenix and back. In addition to Spirit Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and American Airlines - these airlines can fly you to your destination from $256 and $257, respectively. These flights start at 37% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Phoenix one-way?

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $64. Users have also found prices from $128 and $129 on Southwest and American Airlines, respectively.

  • 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 (91%), American Airlines (86%) or Alaska Airlines (86%) 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 $328, our data shows the cheapest flight currently is $143. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $159 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

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Top 5 airlines flying from St. Louis to Phoenix

Discover the top 5 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$103Average$190FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$152Average$373FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$296FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$346FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$290Average$443FlexibilityNo cancel feeOn-time63%

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