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$72+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Mar 19 — Mar 261
Wed 3/19
Wed 3/26
1 adult, Economy
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The best prices from Lambert-St Louis to Phoenix are usually found in May or July, 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 March 14, 2025.

Round-trip from

$244
(CheapOair)

One-way from

$72
(CheapOair)

Popular in

March

Cheapest in

May

Average price

$479
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 ($80 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 14, 2025.

This CheapOair deal was found by Cheapflights users on 3/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/227:03 pmSTL - PHX
1 stop14h 27mFrontier
Tue 3/256:00 amPHX - STL
1 stop25h 16mFrontier
Deal found 3/13$244
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/712:15 pmSTL - PHX
3 stops28h 52mMultiple Airlines
Mon 4/145:46 pmPHX - STL
3 stops21h 29mMultiple Airlines
Deal found 3/13$293
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/106:10 pmSTL - PHX
2 stops24h 31mSpirit Airlines
Mon 4/145:46 pmPHX - STL
2 stops21h 29mSpirit Airlines
Deal found 3/13$310
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/107:33 amSTL - PHX
Nonstop3h 27mAmerican Airlines
Thu 4/178:39 amPHX - STL
Nonstop3h 03mAmerican Airlines
Deal found 3/13$351
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/77:20 pmSTL - PHX
1 stop6h 00mSouthwest
Tue 4/86:40 pmPHX - STL
Nonstop2h 55mSouthwest
Deal found 3/13$357
This Delta deal was found by Cheapflights users on 3/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/217:15 pmSTL - PHX
1 stop6h 18mDelta
Fri 5/3012:45 amPHX - STL
1 stop8h 07mDelta
Deal found 3/13$369
This Alaska Airlines deal was found by Cheapflights users on 3/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/166:44 amSTL - PHX
2 stops15h 10mAlaska Airlines
Sat 4/196:00 amPHX - STL
2 stops15h 59mAlaska Airlines
Deal found 3/13$383
This United Airlines deal was found by Cheapflights users on 3/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/15:20 amSTL - PHX
2 stops9h 06mUnited Airlines
Mon 5/511:59 pmPHX - STL
1 stop10h 20mUnited Airlines
Deal found 3/13$452

Find flights from St. Louis to Phoenix within your budget

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 March 14, 2025.

Fly from

St. Louis

Fly to

Phoenix

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 6/20

7:24 pm-11:27 pm

1 stop6h 03m

Phoenix Sky Harbor Intl

Wed 6/25

7:29 pm-1:42 pm

1 stop16h 13m

$250

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 4/7

12:15 pm-3:07 pm

3 stops28h 52m

Phoenix Sky Harbor Intl

Mon 4/14

5:46 pm-5:15 pm

2 stops21h 29m

$271

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 4/10

6:10 pm-4:41 pm

2 stops24h 31m

Phoenix Sky Harbor Intl

Mon 4/14

5:46 pm-5:15 pm

2 stops21h 29m

$310

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 4/10

7:33 am-9:00 am

Nonstop3h 27m

Phoenix Sky Harbor Intl

Thu 4/17

8:39 am-1:42 pm

Nonstop3h 03m

$351

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 4/7

7:20 pm-11:20 pm

1 stop6h 00m

Phoenix Sky Harbor Intl

Tue 4/8

6:40 pm-11:35 pm

Nonstop2h 55m

$357

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 4/21

7:15 pm-11:33 pm

1 stop6h 18m

Phoenix Sky Harbor Intl

Fri 5/30

12:45 am-10:52 am

1 stop8h 07m

$369

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 4/16

6:44 am-7:54 pm

2 stops15h 10m

Phoenix Sky Harbor Intl

Sat 4/19

6:00 am-11:59 pm

2 stops15h 59m

$383

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 5/1

5:20 am-12:26 pm

2 stops9h 06m

Phoenix Sky Harbor Intl

Mon 5/5

11:59 pm-12:19 pm

1 stop10h 20m

$452

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 5/14

6:53 pm-11:55 pm

1 stop7h 02m

$72

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 5/14

2:19 pm-3:48 pm

Nonstop3h 29m

$176

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Showing 1-10 of 15 results
1
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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.

Travel insights for flights from St. Louis to Phoenix

Get recent, data-driven insights about flights from St. Louis to Phoenix including ideal travel times, pricing trends, and more.

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 March 7, 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 March 14, 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 50% 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.

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 March 14, 2025.

The most flights from STL to PH1 are scheduled on a Tuesday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

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 March 14, 2025.
To help decide which airline to fly from St. Louis to Phoenix, see what other customers have to say about Southwest, Alaska Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,292 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest
8.1
Very good
4,292 reviews
Southwest
8.1
Very good
4,292 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines
8.0
Very good
9,735 reviews
Southwest
8.1
Very good
4,292 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta
8.0
Very good
7,944 reviews
Southwest
8.1
Very good
4,292 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines
7.4
Good
8,623 reviews
Southwest
8.1
Very good
4,292 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,292 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 9 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 $244, 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 American Airlines - these airlines can fly you to your destination from $310 and $351, respectively. These flights start at 25% 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 $72. Users have also found prices from $176 and $203 on American Airlines and Spirit 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 (93%), American Airlines (80%) or Alaska Airlines (80%) 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 $350, our data shows the cheapest flight currently is $138. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $230 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 March 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$145FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$133Average$354FlexibilityNo cancel feeOn-time71%
DeltaCheapest$197Average$287FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$457FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$289Average$449FlexibilityNo cancel feeOn-time63%
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