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Sky Harbor Intl

$49+ Cheap flights from St. Louis (STL) to Sky Harbor Intl (PHX)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Oct 26 — Nov 21
Sun 10/26
Sun 11/2
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Phoenix Sky Harbor Intl are usually found in November or August, booked 69 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from St. Louis to Sky Harbor Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Sky Harbor Intl (PHX). 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 September 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$147
(Kiwi.com)

One-way from

$49
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$372

Good round-trip deal

$265 or less

Good one-way deal

$180 or less
Provider with most accurate pricing for Lambert-St Louis-Phoenix Sky Harbor Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Phoenix Sky Harbor Intl flights.
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From Lambert-St Louis to Phoenix Sky Harbor Intl
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One-way flight from Lambert-St Louis to Phoenix Sky Harbor Intl
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Highest demand for flights based on searches. 7% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Phoenix Sky Harbor Intl.
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Price to beat on a one-way flight from Lambert-St Louis to Phoenix Sky Harbor Intl.
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Find flight deals from St. Louis to Sky Harbor Intl

Cheapest flights from St. Louis to Sky Harbor Intl
Explore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 26, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1010:59 pmSTL - PHX
Nonstop3h 22mFrontier
Fri 10/175:15 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 9/26$147
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/184:51 pmSTL - PHX
1 stop8h 50mFrontier
Fri 10/245:15 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 9/25$148
This Southwest deal was found by Cheapflights users on 9/26. 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 10/226:15 amSTL - PHX
Nonstop3h 20mSouthwest
Tue 10/287:35 pmPHX - STL
Nonstop2h 55mSouthwest
Deal found 9/26$149
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/109:59 pmSTL - PHX
1 stop27h 42mFrontier
Mon 10/132:27 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 9/25$150
This Cheapflightsfares deal was found by Cheapflights users on 9/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1012:09 pmSTL - PHX
Nonstop3h 22mFrontier
Mon 11/177:25 amPHX - STL
Nonstop2h 59mFrontier
Deal found 9/25$151
This Frontier deal was found by Cheapflights users on 9/25. 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.
Sat 10/184:51 pmSTL - PHX
1 stop8h 50mFrontier
Wed 10/227:30 pmPHX - STL
1 stop11h 37mFrontier
Deal found 9/25$152
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/208:21 pmSTL - PHX
Nonstop3h 22mFrontier
Tue 10/286:11 pmPHX - STL
1 stop12h 56mFrontier
Deal found 9/25$153
This Booking.com deal was found by Cheapflights users on 9/25. 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.
Fri 10/179:59 pmSTL - PHX
1 stop16h 24mFrontier
Wed 10/2212:14 pmPHX - STL
1 stop18h 53mFrontier
Deal found 9/25$154
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Mon 10/278:21 pmSTL - PHX
Nonstop3h 22mFrontier
Sun 11/910:53 pmPHX - STL
1 stop9h 14mFrontier
Deal found 9/24$156
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/157:52 pmSTL - PHX
1 stop14h 07mFrontier
Sat 10/188:00 amPHX - STL
1 stop5h 56mFrontier
Deal found 9/25$157
This American Airlines deal was found by Cheapflights users on 9/26. 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 10/227:31 amSTL - PHX
Nonstop3h 34mAmerican Airlines
Sat 10/253:25 pmPHX - STL
Nonstop3h 02mAmerican Airlines
Deal found 9/26$159

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Sky Harbor Intl 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 September 26, 2025.
Use the filters below to find and compare flights from St. Louis to Phoenix Sky Harbor Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Sky Harbor Intl

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/31

9:07 pm-1:10 pm

1 stop18h 03m

Phoenix Sky Harbor Intl

Mon 11/10

10:53 pm-9:07 am

1 stop9h 14m

$163

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/24

5:15 am-6:35 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Tue 10/28

7:35 pm-12:30 am

Nonstop2h 55m

$184

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/31

5:30 pm-9:35 pm

1 stop6h 05m

Phoenix Sky Harbor Intl

Mon 11/3

12:59 am-8:51 am

1 stop6h 52m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/22

7:30 pm-11:38 pm

1 stop6h 08m

Phoenix Sky Harbor Intl

Sat 10/25

6:00 am-1:39 pm

1 stop5h 39m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 12/4

6:15 am-1:13 pm

1 stop7h 58m

Phoenix Sky Harbor Intl

Tue 12/9

6:25 pm-12:49 am

1 stop5h 24m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 10/25

6:50 am-12:15 pm

1 stop7h 25m

Phoenix Sky Harbor Intl

Fri 10/31

12:40 am-8:51 am

1 stop6h 11m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/24

7:30 pm-11:38 pm

1 stop6h 08m

Phoenix Sky Harbor Intl

Tue 10/28

12:40 am-8:51 am

1 stop6h 11m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 10/11

6:20 am-7:40 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Tue 10/14

11:55 am-4:50 pm

Nonstop2h 55m

$244

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 11/24

5:20 am-7:45 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Fri 11/28

6:30 am-10:20 am

Nonstop2h 50m

$244

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

6:55 pm-8:15 pm

Nonstop3h 20m

Phoenix Sky Harbor Intl

Wed 10/22

7:35 pm-12:30 am

Nonstop2h 55m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/24

Showing 1-10 of 18 results
1
2

Compare providers for flights from St. Louis to Sky Harbor Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Sky Harbor Intl in September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Phoenix Sky Harbor Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Phoenix Sky Harbor Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Phoenix Sky Harbor Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Phoenix Sky Harbor Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Phoenix Sky Harbor Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for St. Louis to Phoenix Sky Harbor Intl Airport flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Phoenix Sky Harbor Intl Airport trip
Airports
STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
PHX

For quick access to downtown, take the light rail from 44th Street Station. It's a 20-minute ride from PHX.

Read more about PHXby Brandon Schultz
Our travel experts
Brandon Schultz

Brandon Schultz

Expert on PHX

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Best time to book a flight from St. Louis to Sky Harbor Intl

Have a flexible travel schedule? Discover the best time to fly to Sky Harbor Intl 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 Sky Harbor Intl Airport

How far ahead should I book a flight from St. Louis to Phoenix Sky Harbor Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Sky Harbor Intl. Price data was last updated on September 19, 2025.

Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Phoenix Sky Harbor Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Phoenix Sky Harbor Intl Airport?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $258). Flying from St. Louis to Phoenix Sky Harbor Intl Airport 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 Sky Harbor Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 26, 2025.

When flying from St. Louis to Phoenix Sky Harbor Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 13% versus a flight in the morning.

What is the cheapest day to fly from St. Louis to Phoenix Sky Harbor Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Sky Harbor Intl. Price data was last updated on September 21, 2025.

Travelers seeking maximum savings on their St. Louis to Phoenix Sky Harbor Intl Airport flight should consider departing on Wednesday at noon 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.

Reviews of airlines servicing Sky Harbor Intl

Get insights into the airlines that provide service to Sky Harbor Intl. 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 Sky Harbor Intl. Reviews last updated September 26, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Phoenix Sky Harbor Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,973 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,928 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,161 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Sky Harbor Intl. 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 Sky Harbor Intl?

    For a flight from St. Louis to Phoenix Sky Harbor Intl, you will be flying from 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 6 outbound flights to Phoenix Sky Harbor Intl per day. 6 airlines have flights to Phoenix Sky Harbor Intl from Lambert-St Louis on a regular basis.

  • How long is the flight from St. Louis to Phoenix Sky Harbor Intl Airport?

    A quick flight from St. Louis to Phoenix Sky Harbor Intl Airport can take about 3h 20m. Frontier provides one of the quickest options available for as low as $184. There are 1258 mi between St. Louis and Phoenix Sky Harbor Intl Airport. This flight may include one or multiple stops.

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

    Flying on Frontier is currently your cheapest option to Phoenix Sky Harbor Intl Airport, with prices starting at $105. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and Delta, with the lowest prices starting at $158 and $236, respectively. Frontier is priced at 73% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from St. Louis to Phoenix Sky Harbor Intl Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to Phoenix Sky Harbor Intl Airport on time: SkyWest Airlines (94%), Alaska Airlines (89%), American Airlines (89%).

  • What are the cheapest flights from St. Louis to Phoenix Sky Harbor Intl Airport?

    On average you can expect to pay $311 for a flight from St. Louis to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $112 while the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl) is currently priced at $130.

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

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

  • How can I find direct flights from St. Louis to Sky Harbor Intl?

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

  • Can I find deals for business class flights from St. Louis to Sky Harbor Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Sky Harbor Intl 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 Sky Harbor Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $258). Flying from St. Louis to Phoenix Sky Harbor Intl Airport 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

Traveling to a place near Phoenix Sky Harbor Intl Airport?

Book flights to Phoenix Sky Harbor Intl Airport if you plan to visit one of these locations
Payson
Chandler
Globe
Goodyear
Glendale
Casa Grande
Buckeye
Camp Verde
Peoria
Surprise
Paradise Valley
Avondale
Guadalupe

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Alternative routes for St. Louis to Sky Harbor Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from St. Louis to Sky Harbor Intl

Discover the top 6 airlines that operate flights from St. Louis to Sky Harbor Intl. 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 September 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$105Average$208FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
DeltaCheapest$236Average$356FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$252Average$413FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$267Average$432FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$294Average$392FlexibilityNo cancel feeOn-time69%

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