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Sky Harbor Intl

$59+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Aug 16 — Aug 231
Sat 8/16
Sat 8/23
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 September or August, booked 76 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 August 11, 2025.

Round-trip from

$204
(Priceline)

One-way from

$59
(Frontier)

Popular in

March

Cheapest in

September

Average price

$335

Good round-trip deal

$297 or less

Good one-way deal

$198 or less
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. 8% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 11, 2025.

This Priceline deal was found by Cheapflights users on 8/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/237:52 pmSTL - PHX
1 stop5h 37mFrontier
Mon 10/279:59 pmPHX - STL
1 stop9h 08mFrontier
Deal found 8/10$204
This FlightHub deal was found by Cheapflights users on 8/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/107:55 pmSTL - PHX
1 stop13h 37mFrontier
Sat 9/138:00 amPHX - STL
1 stop6h 03mFrontier
Deal found 8/9$205
This Frontier deal was found by Cheapflights users on 8/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/278:21 pmSTL - PHX
Nonstop3h 22mFrontier
Fri 10/318:53 pmPHX - STL
2 stops10h 14mFrontier
Deal found 8/9$207
This TeaFlight deal was found by Cheapflights users on 8/9. 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 TeaFlight is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/204:58 pmSTL - PHX
1 stop7h 51mFrontier
Tue 9/238:00 amPHX - STL
1 stop23h 06mFrontier
Deal found 8/9$208
This FlightHub deal was found by Cheapflights users on 8/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/197:54 pmSTL - PHX
1 stop28h 00mFrontier
Sat 8/231:45 pmPHX - STL
1 stop17h 33mFrontier
Deal found 8/9$209
This FlightHub deal was found by Cheapflights users on 8/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:55 pmSTL - PHX
1 stop17h 47mFrontier
Sat 9/138:00 amPHX - STL
1 stop6h 03mFrontier
Deal found 8/10$210
This American Airlines deal was found by Cheapflights users on 8/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/62:29 pmSTL - PHX
Nonstop3h 36mAmerican Airlines
Tue 11/117:54 pmPHX - STL
Nonstop2h 56mAmerican Airlines
Deal found 8/10$211
This FlightHub deal was found by Cheapflights users on 8/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1710:59 pmSTL - PHX
Nonstop3h 22mFrontier
Tue 10/216:33 amPHX - STL
1 stop24h 34mFrontier
Deal found 8/10$212
This Frontier deal was found by Cheapflights users on 8/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2110:17 amSTL - PHX
1 stop10h 37mFrontier
Mon 8/259:19 pmPHX - STL
1 stop9h 52mFrontier
Deal found 8/9$213
This FlightHub deal was found by Cheapflights users on 8/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/187:29 pmSTL - PHX
1 stop28h 25mFrontier
Sat 8/231:45 pmPHX - STL
1 stop17h 33mFrontier
Deal found 8/9$214
This FlightHub deal was found by Cheapflights users on 8/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:52 pmSTL - PHX
1 stop5h 37mFrontier
Tue 11/116:33 amPHX - STL
1 stop25h 34mFrontier
Deal found 8/9$215
This FlightHub deal was found by Cheapflights users on 8/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1710:59 pmSTL - PHX
Nonstop3h 22mFrontier
Mon 10/207:59 pmPHX - STL
1 stop11h 08mFrontier
Deal found 8/10$216

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 August 11, 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

Thu 10/23

7:52 pm-11:29 pm

1 stop5h 37m

Phoenix Sky Harbor Intl

Mon 10/27

9:59 pm-9:07 am

1 stop9h 08m

$204

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/10

7:55 pm-7:32 am

1 stop13h 37m

Phoenix Sky Harbor Intl

Sat 9/13

8:00 am-4:03 pm

1 stop6h 03m

$205

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 10/27

8:21 pm-9:43 pm

Nonstop3h 22m

Phoenix Sky Harbor Intl

Wed 10/29

12:09 pm-9:07 am

1 stop18h 58m

$207

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 9/20

4:58 pm-10:49 pm

1 stop7h 51m

Phoenix Sky Harbor Intl

Tue 9/23

8:00 am-9:06 am

1 stop23h 06m

$208

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/15

7:52 pm-7:59 am

1 stop14h 07m

Phoenix Sky Harbor Intl

Sat 10/18

8:00 am-3:56 pm

1 stop5h 56m

$209

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 9/9

7:55 pm-11:42 am

1 stop17h 47m

Phoenix Sky Harbor Intl

Sat 9/13

8:00 am-4:03 pm

1 stop6h 03m

$210

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 11/6

2:29 pm-5:05 pm

Nonstop3h 36m

Phoenix Sky Harbor Intl

Tue 11/11

7:54 pm-11:50 pm

Nonstop2h 56m

$211

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

10:59 pm-12:21 am

Nonstop3h 22m

Phoenix Sky Harbor Intl

Tue 10/21

6:33 am-9:07 am

1 stop24h 34m

$212

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 8/21

10:17 am-6:54 pm

1 stop10h 37m

Phoenix Sky Harbor Intl

Mon 8/25

9:19 pm-9:11 am

1 stop9h 52m

$213

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 9/11

7:55 pm-11:27 pm

1 stop5h 32m

Phoenix Sky Harbor Intl

Sat 9/13

8:00 am-4:03 pm

1 stop6h 03m

$214

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/8

Showing 1-10 of 22 results
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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 August 8, 2025.

Booking 76 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 August 11, 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 12% 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 August 10, 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.

Weekly flight availability from St. Louis to Phoenix Sky Harbor Intl Airport

Explore weekly flight availability from St. Louis to Sky Harbor Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 11, 2025.

The most flights from STL to PHX are scheduled on a Thursday (9 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

What’s the top layover airport for flights from St. Louis to Phoenix Sky Harbor Intl Airport?

Share of 1-stop round-trip flights from St. Louis to Phoenix Sky Harbor Intl Airport chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 67% of 1-stop itineraries from St. Louis to Phoenix Sky Harbor Intl Airport on Cheapflights.

What’s the cheapest layover airport for flights from St. Louis to Phoenix Sky Harbor Intl Airport?

Average round-trip fare for 1-stop flights from St. Louis to Phoenix Sky Harbor Intl Airport, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $133.

What’s the fastest layover option from St. Louis to Phoenix Sky Harbor Intl Airport?

Shortest average travel time for 1-stop one-way flights from St. Louis to Phoenix Sky Harbor Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 7h 26m.

Which airport typically offers the quickest layover for flights from St. Louis to Phoenix Sky Harbor Intl Airport?

Average layover duration for 1-stop one-way flights from St. Louis to Phoenix Sky Harbor Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 3h 08m.

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 August 11, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Southwest
8.0
Very good
4,248 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Sun Country Air
6.9
Okay
333 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)

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.

  • What is the cheapest airline to fly 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 $204. Frontier is priced at 47% 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: Southwest (60%), SkyWest Airlines (56%), American Airlines (46%).

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

    On average you can expect to pay $293 for a flight from St. Louis to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $92 while the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl) is currently priced at $168.

  • 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
Chandler
Payson
Peoria
Glendale
Globe
Goodyear
Surprise
Casa Grande
Buckeye
Camp Verde
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 August 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$210FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$154Average$200FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$222Average$405FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$223Average$392FlexibilityNo cancel feeOn-time69%
DeltaCheapest$245Average$362FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$277Average$436FlexibilityNo cancel feeOn-time63%

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