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$81+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheapflights Tip: The best prices from Phoenix to Lambert-St Louis are usually found in September or August, booked 87 days in advance, depart on a Tuesday 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 July 31, 2025.

Round-trip from

$237
(CheapOair)

One-way from

$81
(Southwest)

Popular in

January

Cheapest in

September

Average price

$373
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. 9% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This CheapOair deal was found by Cheapflights users on 7/29. 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.
Thu 8/2110:42 pmPHX - STL
1 stop12h 50mSpirit Airlines
Mon 8/252:30 pmSTL - PHX
1 stop9h 07mSpirit Airlines
Deal found 7/29$237
This FlightHub deal was found by Cheapflights users on 7/29. 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.
Fri 9/128:15 amPHX - STL
1 stop10h 25mMultiple Airlines
Sun 9/1412:05 pmSTL - PHX
1 stop11h 59mMultiple Airlines
Deal found 7/29$241
This Delta deal was found by Cheapflights users on 7/31. 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 10/235:15 pmPHX - STL
1 stop5h 09mDelta
Sat 10/256:00 amSTL - PHX
1 stop6h 40mDelta
Deal found 7/31$244
This Sun Country Air deal was found by Cheapflights users on 7/31. 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.
Thu 9/186:02 pmPHX - STL
1 stop15h 25mSun Country Air
Sun 9/217:34 amSTL - PHX
1 stop27h 18mSun Country Air
Deal found 7/31$245
This American Airlines deal was found by Cheapflights users on 7/31. 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 8/2812:25 pmPHX - STL
Nonstop3h 05mAmerican Airlines
Thu 9/48:00 amSTL - PHX
Nonstop3h 29mAmerican Airlines
Deal found 7/31$246
This Southwest deal was found by Cheapflights users on 7/29. 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 9/186:30 pmPHX - STL
Nonstop2h 55mSouthwest
Tue 9/2310:25 amSTL - PHX
1 stop6h 25mSouthwest
Deal found 7/29$256
This Trip.com deal was found by Cheapflights users on 7/31. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/712:09 pmPHX - STL
1 stop18h 58mFrontier
Fri 10/102:54 pmSTL - PHX
Nonstop3h 22mFrontier
Deal found 7/31$263

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 July 31, 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

Thu 8/21

10:42 pm-1:32 pm

1 stop12h 50m

Lambert-St Louis

Mon 8/25

2:30 pm-9:37 pm

1 stop9h 07m

$237

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 9/12

8:15 am-8:40 pm

1 stop10h 25m

Lambert-St Louis

Sun 9/14

12:05 pm-10:04 pm

1 stop11h 59m

$241

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

5:15 pm-12:24 am

1 stop5h 09m

Lambert-St Louis

Sat 10/25

6:00 am-10:40 am

1 stop6h 40m

$244

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 9/18

6:02 pm-11:27 am

1 stop15h 25m

Lambert-St Louis

Sun 9/21

7:34 am-8:52 am

1 stop27h 18m

$245

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 8/28

12:25 pm-5:30 pm

Nonstop3h 05m

Lambert-St Louis

Thu 9/4

8:00 am-9:29 am

Nonstop3h 29m

$246

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 9/18

6:30 pm-11:25 pm

Nonstop2h 55m

Lambert-St Louis

Tue 9/23

10:25 am-2:50 pm

1 stop6h 25m

$256

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 10/7

12:09 pm-9:07 am

1 stop18h 58m

Lambert-St Louis

Fri 10/10

2:54 pm-4:16 pm

Nonstop3h 22m

$263

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 8/27

6:10 am-2:26 pm

1 stop6h 16m

Lambert-St Louis

Fri 9/5

4:40 pm-8:17 pm

1 stop5h 37m

$292

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 10/29

5:10 am-10:00 am

Nonstop2h 50m

$81

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 10/27

8:00 am-12:59 pm

Nonstop2h 59m

$93

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

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 July 25, 2025.

To ensure you get the cheapest price possible for a flight from Phoenix to St. Louis, you should look to book at least 87 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 July 31, 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 16% 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 Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Phoenix to St. Louis?

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 July 31, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Phoenix to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 4 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, Spirit Airlines ($237), Delta ($244), and Sun Country Air ($245) offers the cheapest pricing from Phoenix to St. Louis. Users have found that Spirit Airlines is 38% 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 Southwest. According to our data, you can fly for as low as $81. Users have also found prices from $93 and $95 on Frontier and Spirit 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: SkyWest Airlines (93%), Alaska Airlines (90%), American Airlines( 89%).

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

    On average you can expect to pay $310 for a flight from Phoenix to St. Louis. The cheapest flight overall is $123 while the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis) is currently priced at $175.

  • 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Festus
Farmington

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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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$116Average$220FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$207Average$397FlexibilityNo cancel feeOn-time71%
DeltaCheapest$236Average$336FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$263Average$395FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$299Average$415FlexibilityNo cancel feeOn-time63%

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