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$89+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
may. 5 — may. 121
lun. 5/5
lun. 5/12
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Phoenix are usually found in July or June, booked 14 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

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 abril 30, 2025.

Round-trip from

$299
(Booking.com)

One-way from

$89
(Frontier)

Popular in

March

Cheapest in

July

Average price

$384
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. 19% potential increase in price ($83 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in April 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 abril 30, 2025.

This Booking.com deal was found by Cheapflights users on 4/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/222:25 pmSTL - PHX
1 stop8h 49mFrontier
lun. 5/2612:50 pmPHX - STL
1 stop23h 05mFrontier
Deal found 4/28$299
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/279:55 amSTL - PHX
1 stop6h 15mSouthwest
mar. 6/107:25 pmPHX - STL
Nonstop2h 55mSouthwest
Deal found 4/28$301
This American Airlines deal was found by Cheapflights users on 4/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/158:05 amSTL - PHX
Nonstop3h 20mAmerican Airlines
vie. 5/237:01 pmPHX - STL
Nonstop2h 57mAmerican Airlines
Deal found 4/28$303
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/217:19 pmSTL - PHX
1 stop6h 30mDelta
sáb. 5/2412:45 amPHX - STL
1 stop8h 07mDelta
Deal found 4/28$311
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/156:12 pmSTL - PHX
1 stop27h 53mSpirit Airlines
mié. 6/189:35 pmPHX - STL
1 stop17h 29mSpirit Airlines
Deal found 4/28$312
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/156:12 pmSTL - PHX
2 stops17h 20mMultiple Airlines
mié. 6/189:35 pmPHX - STL
1 stop17h 29mMultiple Airlines
Deal found 4/28$335
This United Airlines deal was found by Cheapflights users on 4/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/164:40 pmSTL - PHX
1 stop5h 37mUnited Airlines
sáb. 9/206:00 amPHX - STL
2 stops7h 44mUnited Airlines
Deal found 4/28$340
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/172:55 pmSTL - PHX
1 stop20h 01mAlaska Airlines
lun. 10/205:00 amPHX - STL
1 stop16h 56mAlaska Airlines
Deal found 4/28$425
This Sun Country Air deal was found by Cheapflights users on 4/28. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 5/48:00 amSTL - PHX
1 stop28h 25mSun Country Air
sáb. 5/109:55 amPHX - STL
1 stop8h 45mSun Country Air
Deal found 4/28$430

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 abril 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

jue. 5/22

2:25 pm-9:14 pm

1 stop8h 49m

Phoenix Sky Harbor Intl

lun. 5/26

12:50 pm-1:55 pm

1 stop23h 05m

$299

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

mar. 5/27

9:55 am-2:10 pm

1 stop6h 15m

Phoenix Sky Harbor Intl

mar. 6/10

7:25 pm-12:20 am

Nonstop2h 55m

$301

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

jue. 5/15

8:05 am-9:25 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

vie. 5/23

7:01 pm-11:58 pm

Nonstop2h 57m

$303

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

mié. 5/21

7:19 pm-11:49 pm

1 stop6h 30m

Phoenix Sky Harbor Intl

sáb. 5/24

12:45 am-10:52 am

1 stop8h 07m

$311

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

dom. 6/15

6:12 pm-8:05 pm

1 stop27h 53m

Phoenix Sky Harbor Intl

mié. 6/18

9:35 pm-5:04 pm

1 stop17h 29m

$312

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

dom. 6/15

6:12 pm-9:32 am

2 stops17h 20m

Phoenix Sky Harbor Intl

mié. 6/18

9:35 pm-5:04 pm

1 stop17h 29m

$335

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

mar. 5/27

5:20 am-8:53 am

1 stop5h 33m

Phoenix Sky Harbor Intl

mar. 6/10

6:00 am-3:30 pm

2 stops7h 30m

$344

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

dom. 5/4

8:00 am-10:25 am

1 stop28h 25m

Phoenix Sky Harbor Intl

sáb. 5/10

9:55 am-8:40 pm

1 stop8h 45m

$430

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

jue. 5/29

6:22 pm-9:36 am

2 stops17h 14m

Phoenix Sky Harbor Intl

mié. 6/4

7:00 am-12:04 am

2 stops15h 04m

$534

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

sáb. 5/10

8:15 pm-11:55 pm

1 stop5h 40m

$89

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 18 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 April 25, 2025.

The best time to book flights from St. Louis to Phoenix is 14 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 abril 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 41% 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 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.

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 abril 30, 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
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

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
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

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
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

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
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

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
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

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 5 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 $299, 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 Southwest and American Airlines - these airlines can fly you to your destination from $301 and $303, respectively. These flights start at 11% 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 Frontier. According to our data, you can fly for as low as $89. Users have also found prices from $123 and $132 on Sun Country Air 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 (88%), Southwest (82%) or American Airlines (71%) 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 $611, our data shows the cheapest flight currently is $153. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $235 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 abril 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$149FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$350FlexibilityNo cancel feeOn-time71%
DeltaCheapest$215Average$283FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$218Average$346FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$297Average$448FlexibilityNo cancel feeOn-time63%

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