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Sky Harbor Intl

$38+ 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 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
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Find cheap flights from St. Louis to Sky Harbor Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from Lambert-St Louis to Phoenix Sky Harbor Intl are usually found in October or November, booked 86 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 November 10, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$149
(Frontier)

One-way from

$38
(CheapOair)

Popular in

March

Cheapest in

October

Average price

$321

Good round-trip deal

$257 or less

Good one-way deal

$160 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. 10% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 10, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/10. 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 12/228:52 pmSTL - PHX
Nonstop3h 31mFrontier
Mon 12/294:10 pmPHX - STL
Nonstop2h 57mFrontier
Deal found 11/10$156
This Kiwi.com deal was found by Cheapflights users on 11/8. 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.
Tue 12/163:30 pmSTL - PHX
2 stops28h 01mFrontier
Mon 1/54:10 pmPHX - STL
Nonstop2h 57mFrontier
Deal found 11/8$160
This CheapOair deal was found by Cheapflights users on 11/9. 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 12/111:16 pmSTL - PHX
1 stop6h 15mFrontier
Mon 12/157:25 amPHX - STL
Nonstop2h 57mFrontier
Deal found 11/9$161
This Kiwi.com deal was found by Cheapflights users on 11/8. 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.
Tue 12/163:30 pmSTL - PHX
2 stops33h 19mFrontier
Fri 1/23:50 pmPHX - STL
Nonstop2h 57mFrontier
Deal found 11/8$162
This Mytrip deal was found by Cheapflights users on 11/8. 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 11/1412:09 pmSTL - PHX
Nonstop3h 22mFrontier
Mon 11/177:25 amPHX - STL
Nonstop2h 59mFrontier
Deal found 11/8$163
This CheapOair deal was found by Cheapflights users on 11/9. 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.
Fri 12/512:07 pmSTL - PHX
Nonstop3h 31mFrontier
Mon 12/87:25 amPHX - STL
Nonstop2h 57mFrontier
Deal found 11/9$165
This Kiwi.com deal was found by Cheapflights users on 11/7. 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.
Thu 12/41:16 pmSTL - PHX
1 stop6h 15mFrontier
Sat 12/69:16 amPHX - STL
2 stops22h 43mFrontier
Deal found 11/7$166
This Kiwi.com deal was found by Cheapflights users on 11/8. 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.
Sun 11/237:57 pmSTL - PHX
2 stops13h 22mFrontier
Fri 11/2811:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 11/8$167
This Kiwi.com deal was found by Cheapflights users on 11/9. 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.
Tue 12/163:30 pmSTL - PHX
2 stops33h 19mFrontier
Fri 12/193:50 pmPHX - STL
Nonstop2h 57mFrontier
Deal found 11/9$169
This Super.com deal was found by Cheapflights users on 11/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:52 pmSTL - PHX
Nonstop3h 31mFrontier
Fri 1/23:50 pmPHX - STL
Nonstop2h 57mFrontier
Deal found 11/10$172

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 November 10, 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

Mon 12/1

10:45 pm-1:10 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Sat 12/6

3:10 pm-7:05 pm

Nonstop2h 55m

$229

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/27

8:45 am-1:30 pm

1 stop5h 45m

Phoenix Sky Harbor Intl

Sat 1/31

6:45 am-4:03 pm

2 stops8h 18m

$239

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 12/4

10:15 am-2:20 pm

1 stop5h 05m

Phoenix Sky Harbor Intl

Sat 12/6

6:20 pm-10:10 pm

Nonstop2h 50m

$239

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 12/5

5:34 pm-12:04 am

1 stop7h 30m

Phoenix Sky Harbor Intl

Mon 12/8

6:30 pm-12:48 am

1 stop5h 18m

$249

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/13

11:23 am-10:46 pm

2 stops12h 23m

Phoenix Sky Harbor Intl

Sat 1/24

12:05 pm-11:25 pm

2 stops10h 20m

$274

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 12/16

8:50 am-11:20 am

Nonstop3h 30m

Phoenix Sky Harbor Intl

Fri 1/2

8:45 pm-12:35 am

Nonstop2h 50m

$283

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/14

5:55 am-8:35 am

Nonstop3h 40m

Phoenix Sky Harbor Intl

Sun 1/18

6:30 pm-10:20 pm

Nonstop2h 50m

$297

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 12/10

1:35 pm-9:18 pm

2 stops8h 43m

Phoenix Sky Harbor Intl

Tue 12/16

8:50 am-8:57 pm

2 stops11h 07m

$307

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 12/30

8:35 pm-1:20 am

1 stop5h 45m

Phoenix Sky Harbor Intl

Thu 1/1

5:45 am-9:35 am

Nonstop2h 50m

$307

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 12/13

1:35 pm-5:51 pm

1 stop5h 16m

Phoenix Sky Harbor Intl

Wed 12/17

10:10 am-10:45 pm

2 stops11h 35m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 20 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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on St. Louis-Phoenix Sky Harbor Intl Airport flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

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 November 7, 2025.

Booking 86 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, October is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $107). Flying from St. Louis to Phoenix Sky Harbor Intl Airport in June is currently the most expensive (average of $235). 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 November 10, 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 15% 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 November 2, 2025.

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

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

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

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 November 10, 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
4,235 reviews

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
7.9
Good
8,007 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
9,012 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
11,045 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
3,113 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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 8 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 25m. Southwest provides one of the quickest options available for as low as $229. 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 $94. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and United Airlines, with the lowest prices starting at $158 and $223, respectively. Frontier is priced at 75% 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 (100%), Alaska Airlines (83%), American Airlines (82%).

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

    On average you can expect to pay $409 for a flight from St. Louis to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $69 while the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl) is currently priced at $139.

  • 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, October is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $107). Flying from St. Louis to Phoenix Sky Harbor Intl Airport in June is currently the most expensive (average of $235). 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
Goodyear
Glendale
Payson
Chandler
Casa Grande
Globe
Peoria
Camp Verde
Buckeye
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 November 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$207FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$223Average$386FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$357FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$400FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$248Average$417FlexibilityNo cancel feeOn-time63%

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