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$55+ Cheap flights from Sky Harbor Intl (PHX) to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Dec 30 — Jan 61
Tue 12/30
Tue 1/6
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Phoenix Sky Harbor Intl to Lambert-St Louis are usually found in October or November, booked 87 days in advance, depart on a Tuesday or Friday and return on a Wednesday

Find flight deals from Sky Harbor Intl to St. Louis

Cheapest flights from Sky Harbor Intl to St. Louis
Explore the most affordable flight options available from Sky Harbor Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 30, 2025.

This Frontier deal was found by Cheapflights users on 11/28. 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 12/127:25 amPHX - STL
Nonstop2h 57mFrontier
Mon 12/1512:07 pmSTL - PHX
Nonstop3h 31mFrontier
Deal found 11/28$160
This Kiwi.com deal was found by Cheapflights users on 11/27. 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 12/94:32 pmPHX - STL
1 stop16h 42mFrontier
Fri 12/1212:07 pmSTL - PHX
Nonstop3h 31mFrontier
Deal found 11/27$163
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/1010:05 amPHX - STL
2 stops25h 07mFrontier
Sat 12/137:43 pmSTL - PHX
1 stop6h 01mFrontier
Deal found 11/28$165
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/137:43 pmPHX - STL
1 stop15h 29mFrontier
Sat 1/107:43 pmSTL - PHX
1 stop13h 23mFrontier
Deal found 11/28$167
This Kiwi.com deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/168:00 amPHX - STL
2 stops25h 14mFrontier
Wed 1/77:43 pmSTL - PHX
1 stop13h 23mFrontier
Deal found 11/29$169
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/510:36 pmPHX - STL
2 stops10h 38mFrontier
Mon 1/127:43 pmSTL - PHX
1 stop18h 13mFrontier
Deal found 11/28$171
This Frontier deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:31 pmPHX - STL
1 stop10h 31mFrontier
Mon 1/58:52 pmSTL - PHX
Nonstop3h 31mFrontier
Deal found 11/29$172
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/177:43 pmPHX - STL
1 stop19h 41mFrontier
Mon 12/228:52 pmSTL - PHX
Nonstop3h 31mFrontier
Deal found 11/28$173
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/79:59 pmPHX - STL
1 stop13h 13mFrontier
Mon 1/127:43 pmSTL - PHX
1 stop18h 13mFrontier
Deal found 11/28$175
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/510:36 pmPHX - STL
2 stops10h 38mFrontier
Wed 1/77:43 pmSTL - PHX
1 stop13h 23mFrontier
Deal found 11/28$176
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/510:26 pmPHX - STL
1 stop10h 48mFrontier
Sat 1/107:43 pmSTL - PHX
1 stop13h 23mFrontier
Deal found 11/28$177

Cheap flight deals from Sky Harbor Intl to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Sky Harbor Intl (PHX) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$160
(Frontier)

One-way from

$55
(WAYA)

Popular in

January

Cheapest in

October

Average price

$342

Good round-trip deal

$211 or less

Good one-way deal

$100 or less
Provider with most accurate pricing for Phoenix Sky Harbor Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Phoenix Sky Harbor Intl-Lambert-St Louis flights.
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From Phoenix Sky Harbor Intl to Lambert-St Louis
Search Deals
One-way flight from Phoenix Sky Harbor Intl to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Phoenix Sky Harbor Intl to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Phoenix Sky Harbor Intl to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sky Harbor Intl to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 30, 2025.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to St. Louis that are best for you.

Fly from

Sky Harbor Intl

Fly to

St. Louis

Route

Depart

Return

Price

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sun 12/21

10:31 pm-10:02 am

1 stop10h 31m

Lambert-St Louis

Fri 1/2

8:42 pm-11:13 pm

Nonstop3h 31m

$186

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 12/19

9:58 am-9:25 pm

1 stop10h 27m

Lambert-St Louis

Mon 12/22

10:10 pm-8:48 am

1 stop11h 38m

$207

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 12/22

9:58 am-9:25 pm

1 stop10h 27m

Lambert-St Louis

Wed 12/31

4:27 pm-11:49 pm

1 stop8h 22m

$234

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 12/20

7:00 am-9:40 am

2 stops25h 40m

Lambert-St Louis

Mon 1/5

8:52 pm-11:23 pm

Nonstop3h 31m

$298

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 2/4

1:20 pm-5:10 pm

Nonstop2h 50m

Lambert-St Louis

Sat 2/7

1:45 pm-5:35 pm

1 stop4h 50m

$303

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 12/24

12:59 am-10:33 pm

1 stop20h 34m

Lambert-St Louis

Mon 12/29

10:10 pm-8:48 am

1 stop11h 38m

$304

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 2/19

10:58 am-4:58 pm

1 stop5h 00m

Lambert-St Louis

Tue 2/24

7:41 am-3:29 pm

2 stops8h 48m

$319

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 12/22

6:19 pm-6:36 pm

3 stops23h 17m

Lambert-St Louis

Fri 1/2

8:42 pm-11:13 pm

Nonstop3h 31m

$330

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 1/9

6:30 pm-10:20 pm

Nonstop2h 50m

Lambert-St Louis

Sun 1/11

2:55 pm-5:25 pm

Nonstop3h 30m

$337

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 1/26

6:55 am-10:45 am

Nonstop2h 50m

Lambert-St Louis

Mon 1/26

7:55 pm-10:25 pm

Nonstop3h 30m

$337

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/29

Showing 1-10 of 20 results
1
2

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

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 Sky Harbor Intl to St. Louis 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
MytripPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 Phoenix Sky Harbor Intl Airport-St. Louis flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Phoenix Sky Harbor Intl Airport-St. Louis flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Phoenix Sky Harbor Intl Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-St. Louis flights, Cheapflights users trust Mytrip the most. Mytrip 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 Phoenix Sky Harbor Intl Airport-St. Louis 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 Sky Harbor Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Sky Harbor Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Phoenix Sky Harbor Intl Airport to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from Sky Harbor Intl to St. Louis. Price data was last updated on November 28, 2025.

To ensure you get the cheapest price possible for a flight from Phoenix Sky Harbor Intl Airport to St. Louis, you should look to book at least 87 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, October is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $122). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in April is currently the most expensive (average of $303). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PHX to STL?

Find hourly flight availability from Sky Harbor Intl to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 30, 2025.

A simple way to save on the total cost of your ticket is to fly from Phoenix Sky Harbor Intl Airport to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 2% on your trip compared to booking a flight in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to St. Louis. Price data was last updated on November 29, 2025.

Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Louis flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Phoenix Sky Harbor Intl Airport to St. Louis 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 Phoenix Sky Harbor Intl Airport to St. Louis trip
Airports
PHX

PHX offers short security lines, typically under 10 minutes, ensuring a quick start to your journey to STL.

Read more about PHXby Brandon Schultz
STL

Use the MetroLink light rail from STL for a convenient, economical ride to downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
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 St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated November 30, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Phoenix Sky Harbor Intl Airport to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,251 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,011 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,057 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,042 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.8
Fair
3,099 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

Find useful and relevant information for your journey from Sky Harbor Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Phoenix Sky Harbor Intl?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to St. Louis from Phoenix Sky Harbor Intl. Booking flights from Phoenix Sky Harbor Intl to Lambert-St Louis (STL) should be relatively easy as there are 4 daily inbound flights from Phoenix Sky Harbor Intl from 5 different airlines.

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

    Departing from Phoenix Sky Harbor Intl Airport to St. Louis will take you 2h 50m. The distance between Phoenix Sky Harbor Intl Airport and St. Louis is about 1258 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $113, Frontier will fly you from Phoenix Sky Harbor Intl Airport to St. Louis and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and American Airlines - these airlines can fly you to your destination from $198 and $229, respectively. You may be able to fly from Phoenix Sky Harbor Intl Airport to St. Louis for 70% less than the average price by searching for these airlines.

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

    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 Phoenix Sky Harbor Intl Airport to St. Louis on time: SkyWest Airlines (100%), American Airlines (81%), Frontier (80%).

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

    While on average a flight from Phoenix Sky Harbor Intl Airport to St. Louis is generally $260, our data shows the cheapest flight currently is $71. When looking at the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis), you can expect to pay $173 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sky Harbor Intl to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, October is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $122). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in April is currently the most expensive (average of $303). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

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

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Alternative routes for Sky Harbor Intl to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Sky Harbor Intl to Springfield flights
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Top 5 airlines flying from Sky Harbor Intl to St. Louis

Discover the top 5 airlines that operate flights from Sky Harbor Intl to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$113Average$224FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$198Average$386FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$229Average$397FlexibilityNo cancel feeOn-time71%
DeltaCheapest$236Average$367FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$264Average$402FlexibilityNo cancel feeOn-time63%

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