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St. Louis

$96+ Cheap flights from Phoenix to St. Louis (STL)

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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Apr 20 — Apr 271
Sun 4/20
Sun 4/27
1 adult, Economy
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Cheapflights Tip: The best prices from Phoenix to Lambert-St Louis are usually found in June or July, booked 73 days in advance, depart on a Wednesday or Friday and return on a Wednesday

Cheap flight deals from Phoenix to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Phoenix (PH1) to St. Louis (STL). 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 April 15, 2025.

Round-trip from

$288
(CheapOair)

One-way from

$96
(CheapOair)

Popular in

January

Cheapest in

June

Average price

$365
From Phoenix to Lambert-St Louis
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One-way flight from Phoenix to Lambert-St Louis
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Highest demand for flights based on searches. 20% potential increase in price ($89 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 April 2025
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Find flight deals from Phoenix to St. Louis

Cheapest flights from Phoenix to St. Louis
Explore the most affordable flight options available from Phoenix to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.

This CheapOair deal was found by Cheapflights users on 4/14. 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 5/285:32 pmPHX - STL
1 stop28h 20mFrontier
Wed 7/167:29 pmSTL - PHX
1 stop14h 56mFrontier
Deal found 4/14$288
This Southwest deal was found by Cheapflights users on 4/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/286:40 pmPHX - STL
Nonstop2h 55mSouthwest
Wed 7/165:35 amSTL - PHX
Nonstop3h 15mSouthwest
Deal found 4/14$299
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/287:01 pmPHX - STL
Nonstop2h 57mAmerican Airlines
Wed 7/167:38 pmSTL - PHX
1 stop5h 38mAmerican Airlines
Deal found 4/14$309
This Mytrip deal was found by Cheapflights users on 4/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/151:30 pmPHX - STL
1 stop20h 07mMultiple Airlines
Sun 5/1810:10 amSTL - PHX
2 stops24h 03mMultiple Airlines
Deal found 4/14$317
This Delta deal was found by Cheapflights users on 4/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/286:00 amPHX - STL
1 stop5h 34mDelta
Sat 5/317:30 amSTL - PHX
1 stop6h 41mDelta
Deal found 4/15$319
This Mytrip deal was found by Cheapflights users on 4/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/239:19 amPHX - STL
2 stops21h 56mSpirit Airlines
Sun 5/2510:10 amSTL - PHX
2 stops24h 03mSpirit Airlines
Deal found 4/14$348
This United Airlines deal was found by Cheapflights users on 4/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/107:04 amPHX - STL
1 stop6h 43mUnited Airlines
Wed 7/168:54 amSTL - PHX
2 stops8h 15mUnited Airlines
Deal found 4/14$381
This Alaska Airlines deal was found by Cheapflights users on 4/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/67:00 amPHX - STL
2 stops14h 59mAlaska Airlines
Wed 5/76:30 amSTL - PHX
1 stop8h 24mAlaska Airlines
Deal found 4/14$386

Cheapflights Fare Finder

Customize your flight search to find flights from Phoenix to St. Louis 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 April 15, 2025.
Use the filters below to find and compare flights from Phoenix to St. Louis that are best for you.

Fly from

Phoenix

Fly to

St. Louis

Route

Depart

Return

Price

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 5/28

5:32 pm-11:52 pm

1 stop28h 20m

Lambert-St Louis

Wed 7/16

7:29 pm-8:25 am

1 stop14h 56m

$288

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 5/28

6:40 pm-11:35 pm

Nonstop2h 55m

Lambert-St Louis

Wed 7/16

5:35 am-6:50 am

Nonstop3h 15m

$299

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 5/28

7:01 pm-11:58 pm

Nonstop2h 57m

Lambert-St Louis

Wed 7/16

7:38 pm-11:16 pm

1 stop5h 38m

$309

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 5/15

1:30 pm-11:37 am

1 stop20h 07m

Lambert-St Louis

Sun 5/18

10:10 am-8:13 am

2 stops24h 03m

$317

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 5/28

6:00 am-1:34 pm

1 stop5h 34m

Lambert-St Louis

Sat 5/31

7:30 am-12:11 pm

1 stop6h 41m

$319

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 5/23

9:19 am-9:15 am

2 stops21h 56m

Lambert-St Louis

Sun 5/25

10:10 am-8:13 am

2 stops24h 03m

$348

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 7/10

7:04 am-3:47 pm

1 stop6h 43m

Lambert-St Louis

Wed 7/16

8:54 am-3:09 pm

2 stops8h 15m

$381

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 5/6

7:00 am-11:59 pm

2 stops14h 59m

Lambert-St Louis

Wed 5/7

6:30 am-12:54 pm

1 stop8h 24m

$386

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 4/30

7:35 pm-3:07 pm

1 stop17h 32m

$96

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 6/28

9:35 pm-3:22 pm

1 stop15h 47m

$117

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Showing 1-10 of 17 results
1
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Best time to book a flight from Phoenix to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Phoenix 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 Phoenix to St. Louis

How far ahead should I book a flight from Phoenix to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Phoenix to St. Louis. Price data was last updated on April 11, 2025.

To ensure you get the cheapest price possible for a flight from Phoenix to St. Louis, you should look to book at least 73 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Phoenix to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $311). Flying from Phoenix to St. Louis in March is currently the most expensive (average of $356). 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 PHX to STL?

Find hourly flight availability from Phoenix to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 15, 2025.

A simple way to save on the total cost of your ticket is to fly from Phoenix to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 54% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Phoenix to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Phoenix to St. Louis. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Phoenix to St. Louis flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated April 15, 2025.
To help decide which airline to fly from Phoenix to St. Louis, 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
9,871 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,656 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

Find useful and relevant information for your journey from Phoenix to St. Louis. 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 into for flights to St. Louis from Phoenix?

    For a flight from Phoenix to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 8 inbound flights from Phoenix per day. 5 airlines have flights to Lambert-St Louis from Phoenix on a regular basis.

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

    According to our current data, Frontier ($288), Southwest ($299), and American Airlines ($309) offers the cheapest pricing from Phoenix to St. Louis. Users have found that Frontier is 14% cheaper than the other options available to this destination.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $96. Users have also found prices from $117 and $150 on Spirit Airlines and American Airlines, respectively.

  • What are the most reliable airlines from Phoenix to St. Louis?

    Before booking your flight to St. Louis from Phoenix, check out the most reliable airlines to get you to your destination on time: American Airlines (91%), Alaska Airlines (91%), SkyWest Airlines( 88%).

  • What are the cheapest flights from Phoenix to St. Louis?

    On average you can expect to pay $345 for a flight from Phoenix to St. Louis. The cheapest flight overall is $175 while the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis) is currently priced at $237.

  • Can I find deals for flights from Phoenix to St. Louis that include hotel bookings?

    Yes. In addition to deals on Phoenix to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Phoenix to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Phoenix to St. Louis.

  • Can I find deals for business class flights from Phoenix to St. Louis?

    Yes. Cheapflights offers flight deals from Phoenix to St. Louis 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 Phoenix to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $311). Flying from Phoenix to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near Phoenix?

Book flights to Phoenix if you plan to visit one of these locations
Fenton
Maryland Heights
Fairview Heights
Collinsville
Wentzville
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Chesterfield

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Top 5 airlines flying from Phoenix to St. Louis

Discover the top 5 airlines that operate flights from Phoenix to St. Louis. 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 April 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$154FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$326FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$296FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$263Average$352FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$303Average$438FlexibilityNo cancel feeOn-time63%

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