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$54+ 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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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The best prices from Lambert-St Louis to Phoenix are usually found in May or July, booked 83 days in advance, depart on a Tuesday 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 December 18, 2024.

Round-trip from

$203
(Trip.com)

One-way from

$54
(Cheapflightsfares)

Popular in

March

Cheapest in

May

Average price

$404
From Lambert-St Louis to Phoenix
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One-way flight from Lambert-St Louis to Phoenix
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High demand for flights, 17% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in December 2024
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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 December 18, 2024.

This Frontier deal was found by Cheapflights users on 12/17. 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 12/306:49 pmSTL - PHX
1 stop6h 50mFrontier
Sat 1/49:50 pmPHX - STL
1 stop12h 20mFrontier
Deal found 12/17$282
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Tue 12/315:45 amSTL - PHX
1 stop9h 04mAmerican Airlines
Tue 12/3112:45 amPHX - STL
1 stop7h 51mAmerican Airlines
Deal found 12/17$388
This Orbitz deal was found by Cheapflights users on 12/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/186:49 pmSTL - PHX
1 stop6h 33mMultiple Airlines
Fri 1/2411:50 amPHX - STL
2 stops11h 09mMultiple Airlines
Deal found 12/18$531
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/314:43 pmSTL - PHX
2 stops19h 42mUnited Airlines
Wed 1/15:10 pmPHX - STL
1 stop5h 49mUnited Airlines
Deal found 12/17$551
This Southwest deal was found by Cheapflights users on 12/18. 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.
Wed 12/1810:45 amSTL - PHX
Nonstop3h 25mSouthwest
Fri 1/246:55 amPHX - STL
Nonstop2h 50mSouthwest
Deal found 12/18$599
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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.
Tue 12/174:08 pmSTL - PHX
2 stops19h 48mAlaska Airlines
Mon 1/66:10 amPHX - STL
2 stops16h 17mAlaska Airlines
Deal found 12/16$879

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 2/20

11:08 pm-7:47 am

1 stop9h 39m

Phoenix Sky Harbor Intl

Sat 2/22

8:52 am-7:52 pm

1 stop10h 00m

$203

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 2/22

6:54 pm-12:59 am

1 stop7h 05m

Phoenix Sky Harbor Intl

Wed 2/26

11:51 am-11:59 pm

2 stops11h 08m

$231

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/7

7:15 am-9:54 am

Nonstop3h 39m

Phoenix Sky Harbor Intl

Wed 1/8

9:30 am-1:42 pm

Nonstop3h 12m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/15

8:25 pm-11:00 pm

Nonstop3h 35m

Phoenix Sky Harbor Intl

Wed 1/22

7:10 am-12:55 pm

1 stop4h 45m

$287

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/7

5:00 pm-12:46 am

1 stop8h 46m

Phoenix Sky Harbor Intl

Wed 1/8

6:30 am-1:18 pm

1 stop5h 48m

$296

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 1/11

7:00 am-2:08 pm

1 stop8h 08m

Phoenix Sky Harbor Intl

Wed 1/15

8:00 am-3:38 pm

1 stop6h 38m

$313

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/22

2:49 pm-10:43 pm

1 stop8h 54m

Phoenix Sky Harbor Intl

Wed 2/12

6:40 am-11:59 pm

2 stops16h 19m

$321

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 1/18

7:09 pm-12:26 am

1 stop6h 17m

$54

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 1/24

12:15 pm-12:09 am

2 stops12h 54m

$116

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 2/18

7:15 am-9:59 am

Nonstop3h 44m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 15 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.

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 December 13, 2024.

The best time to book flights from St. Louis to Phoenix is 83 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 December 18, 2024.

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 51% 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 Wednesday evenings when fares are most often at their lowest. Sunday at noon 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 December 18, 2024.
To help decide which airline to fly from St. Louis to Phoenix, see what other customers have to say about Alaska Airlines, Southwest and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 $203, 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 American Airlines and Southwest - these airlines can fly you to your destination from $277 and $287, respectively. These flights start at 36% 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 $54. Users have also found prices from $139 and $144 on American Airlines and Southwest, 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 (83%), Southwest (83%) or Alaska Airlines (74%) 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 $412, our data shows the cheapest flight currently is $148. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $202 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$151FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$147Average$373FlexibilityNo cancel feeOn-time71%
DeltaCheapest$215Average$293FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$505FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$240Average$433FlexibilityNo cancel feeOn-time63%
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