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Sky Harbor Intl

$123+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Mar 29 — Apr 51
Sat 3/29
Sat 4/5
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 May or July, booked 14 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

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 March 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$276
(Mytrip)

One-way from

$123
(Mytrip)

Popular in

March

Cheapest in

May

Average price

$481

Good round-trip deal

$372 or less

Good one-way deal

$182 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. 20% potential increase in price ($84 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 24, 2025.

This Booking.com deal was found by Cheapflights users on 3/23. 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.
Sun 5/48:00 amSTL - PHX
1 stop6h 30mMultiple Airlines
Thu 5/85:50 amPHX - STL
1 stop7h 17mMultiple Airlines
Deal found 3/23$283
This Mytrip deal was found by Cheapflights users on 3/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/246:10 pmSTL - PHX
2 stops21h 18mSpirit Airlines
Mon 4/285:46 pmPHX - STL
2 stops21h 29mSpirit Airlines
Deal found 3/24$285
This Frontier deal was found by Cheapflights users on 3/23. 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.
Fri 4/46:51 pmSTL - PHX
1 stop7h 06mFrontier
Sun 4/69:00 pmPHX - STL
1 stop10h 06mFrontier
Deal found 3/23$298
This Delta deal was found by Cheapflights users on 3/22. 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 4/307:40 amSTL - PHX
1 stop6h 29mDelta
Tue 5/61:30 pmPHX - STL
1 stop5h 33mDelta
Deal found 3/22$339
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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.
Wed 4/166:44 amSTL - PHX
2 stops15h 10mAlaska Airlines
Wed 4/236:00 amPHX - STL
1 stop15h 59mAlaska Airlines
Deal found 3/23$364
This Southwest deal was found by Cheapflights users on 3/22. 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 4/1610:55 amSTL - PHX
1 stop4h 25mSouthwest
Sun 4/208:20 pmPHX - STL
Nonstop2h 55mSouthwest
Deal found 3/22$365
This American Airlines deal was found by Cheapflights users on 3/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/247:03 pmSTL - PHX
1 stop6h 53mAmerican Airlines
Mon 4/286:54 pmPHX - STL
Nonstop2h 56mAmerican Airlines
Deal found 3/24$369
This United deal was found by Cheapflights users on 3/24. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/37:24 amSTL - PHX
2 stops15h 38mUnited Airlines
Tue 5/68:30 amPHX - STL
1 stop5h 19mUnited Airlines
Deal found 3/24$420

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 March 24, 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

Sun 5/4

8:00 am-12:30 pm

1 stop6h 30m

Phoenix Sky Harbor Intl

Thu 5/8

5:50 am-3:07 pm

1 stop7h 17m

$283

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 4/24

6:10 pm-1:28 pm

2 stops21h 18m

Phoenix Sky Harbor Intl

Mon 4/28

5:46 pm-5:15 pm

2 stops21h 29m

$285

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 4/4

6:51 pm-11:57 pm

1 stop7h 06m

Phoenix Sky Harbor Intl

Sun 4/6

9:00 pm-9:06 am

1 stop10h 06m

$298

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 4/30

7:40 am-12:09 pm

1 stop6h 29m

Phoenix Sky Harbor Intl

Tue 5/6

1:30 pm-9:03 pm

1 stop5h 33m

$339

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 4/16

6:44 am-7:54 pm

2 stops15h 10m

Phoenix Sky Harbor Intl

Wed 4/23

6:00 am-11:59 pm

1 stop15h 59m

$364

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 4/16

10:55 am-1:20 pm

1 stop4h 25m

Phoenix Sky Harbor Intl

Sun 4/20

8:20 pm-1:15 am

Nonstop2h 55m

$365

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 4/24

7:03 pm-11:56 pm

1 stop6h 53m

Phoenix Sky Harbor Intl

Mon 4/28

6:54 pm-11:50 pm

Nonstop2h 56m

$369

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 5/3

7:24 am-9:02 pm

2 stops15h 38m

Phoenix Sky Harbor Intl

Tue 5/6

8:30 am-3:49 pm

1 stop5h 19m

$420

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 4/28

8:15 am-5:59 pm

1 stop11h 44m

$123

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 4/27

6:10 pm-1:28 pm

2 stops21h 18m

$126

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 16 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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
MytripPrice 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 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 Phoenix, take the free PHX Sky Train to 44th Street Station, then the light rail or Route 1 bus.

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 March 21, 2025.

Booking 14 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 March 24, 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 in the evening, which can drop the price by up to 47% 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 March 23, 2025.

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

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 March 24, 2025.

The most flights from STL to PHX are scheduled on a Sunday (14 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).

Rainfall in Sky Harbor Intl by month

Plan your trip to Sky Harbor Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Phoenix Sky Harbor Intl Airport ranges from 0.0 - 1.1 inches per month. July is typically the wettest month, when rainfall can reach 1.1 in. June is typically the driest time to visit Phoenix Sky Harbor Intl Airport when rainfall is around 0.0 in.

Temperature in Sky Harbor Intl by month

Plan your trip to Sky Harbor Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Phoenix Sky Harbor Intl Airport, 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 95.0 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 55.4 F).

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 March 24, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from St. Louis to Phoenix by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,785 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,785 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,888 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,330 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,603 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 9 outbound flights to Phoenix Sky Harbor Intl per day. 5 airlines have flights to Phoenix Sky Harbor Intl from Lambert-St Louis on a regular basis.

  • 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 $278. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and Delta, with the lowest prices starting at $285 and $339, respectively. Frontier is priced at 15% lower than the current average price of a flight leaving 3 months from now.

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

    One-way options have recently been found by users for as low as $123 on Sun Country Air. Other airlines that offer cheap prices include Spirit Airlines from $126 and Frontier from $129 one-way.

  • 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 (86%), American Airlines (84%), Alaska Airlines (84%).

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

    On average you can expect to pay $709 for a flight from St. Louis to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $88 while the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl) is currently priced at $255.

  • 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 St. Louis?

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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 5 airlines flying from St. Louis to Sky Harbor Intl

Discover the top 5 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 March 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$146FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$353FlexibilityNo cancel feeOn-time71%
DeltaCheapest$197Average$276FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$443FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$292Average$448FlexibilityNo cancel feeOn-time63%
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