St. Louis

$27+ 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 12/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Nov 22 — Nov 291
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Find cheap flights from Sky Harbor Intl to St. Louis 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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Cheapflights Tip: The best prices from Phoenix Sky Harbor Intl to Lambert-St Louis are usually found in August or September, booked 87 days in advance, depart on a Tuesday or Wednesday 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 October 23, 2025.

This Southwest deal was found by Cheapflights users on 10/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/118:25 amPHX - STL
Nonstop2h 55mSouthwest
Tue 11/118:15 pmSTL - PHX
Nonstop3h 25mSouthwest
Deal found 10/23$177
This Frontier deal was found by Cheapflights users on 10/23. 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.
Tue 11/119:05 pmPHX - STL
1 stop11h 02mFrontier
Fri 11/142:42 pmSTL - PHX
1 stop9h 47mFrontier
Deal found 10/23$182
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:43 pmPHX - STL
1 stop21h 26mFrontier
Fri 11/283:53 pmSTL - PHX
Nonstop3h 33mFrontier
Deal found 10/23$188
This Frontier deal was found by Cheapflights users on 10/23. 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.
Tue 11/259:23 amPHX - STL
1 stop10h 46mFrontier
Mon 12/13:53 pmSTL - PHX
Nonstop3h 33mFrontier
Deal found 10/23$191
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/57:25 amPHX - STL
Nonstop2h 57mFrontier
Wed 12/107:43 pmSTL - PHX
1 stop13h 23mFrontier
Deal found 10/23$193
This Priceline deal was found by Cheapflights users on 10/22. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:01 amPHX - STL
1 stop5h 56mFrontier
Fri 11/77:45 pmSTL - PHX
1 stop5h 44mFrontier
Deal found 10/22$194
This eDestinos deal was found by Cheapflights users on 10/22. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/69:16 amPHX - STL
2 stops23h 31mFrontier
Sat 12/137:43 pmSTL - PHX
1 stop13h 23mFrontier
Deal found 10/22$195
This American Airlines deal was found by Cheapflights users on 10/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:25 amPHX - STL
1 stop9h 11mAmerican Airlines
Sun 12/142:37 pmSTL - PHX
Nonstop3h 29mAmerican Airlines
Deal found 10/23$196
This American Airlines deal was found by Cheapflights users on 10/21. 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.
Fri 12/59:44 amPHX - STL
Nonstop3h 07mAmerican Airlines
Sun 12/77:38 amSTL - PHX
Nonstop3h 31mAmerican Airlines
Deal found 10/21$198
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:01 amPHX - STL
1 stop5h 56mFrontier
Sun 11/27:45 pmSTL - PHX
1 stop13h 39mFrontier
Deal found 10/22$201

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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(Frontier)

One-way from

$27
(Kiwi.com)

Popular in

January

Cheapest in

August

Average price

$350

Good round-trip deal

$308 or less

Good one-way deal

$144 or less
Provider with most accurate pricing for Phoenix Sky Harbor Intl-Lambert-St Louis flight deals.
Provider most trusted by Cheapflights users for Phoenix Sky Harbor Intl-Lambert-St Louis flights.
From Phoenix Sky Harbor Intl to Lambert-St Louis
One-way flight from Phoenix Sky Harbor Intl to Lambert-St Louis
Highest demand for flights based on searches. 7% potential increase in price ($32 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Average for round-trip flights in October 2025
Price to beat on a round-trip flight from Phoenix Sky Harbor Intl to Lambert-St Louis.
Price to beat on a one-way flight from Phoenix Sky Harbor Intl to Lambert-St Louis.

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 October 23, 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

Thu 12/11

6:30 pm-10:20 pm

Nonstop2h 50m

Lambert-St Louis

Sun 1/4

5:00 am-7:35 am

Nonstop3h 35m

$215

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 12/17

6:30 pm-1:01 am

1 stop5h 31m

Lambert-St Louis

Thu 12/25

7:20 am-1:23 pm

1 stop7h 03m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/11

10:55 am-7:10 pm

1 stop7h 15m

Lambert-St Louis

Fri 1/2

7:20 am-1:23 pm

1 stop7h 03m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/11

6:30 pm-12:48 am

1 stop5h 18m

Lambert-St Louis

Thu 1/1

7:20 am-1:23 pm

1 stop7h 03m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/4

6:30 pm-12:48 am

1 stop5h 18m

Lambert-St Louis

Tue 12/9

9:00 am-2:00 pm

1 stop6h 00m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 11/10

12:59 am-8:55 am

1 stop6h 56m

Lambert-St Louis

Tue 11/18

2:21 pm-6:56 pm

1 stop5h 35m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 12/10

12:59 am-9:10 am

1 stop7h 11m

Lambert-St Louis

Sun 12/14

9:00 am-2:00 pm

1 stop6h 00m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 11/5

4:15 pm-8:05 pm

Nonstop2h 50m

Lambert-St Louis

Mon 11/10

5:20 am-7:45 am

Nonstop3h 25m

$246

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 12/9

8:25 am-12:20 pm

Nonstop2h 55m

Lambert-St Louis

Fri 1/2

5:00 am-7:35 am

Nonstop3h 35m

$254

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 11/26

6:27 pm-12:46 am

1 stop5h 19m

Lambert-St Louis

Tue 12/2

6:30 am-1:12 pm

1 stop7h 42m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Showing 1-10 of 21 results
1
2
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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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy2 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Phoenix Sky Harbor Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >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 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 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 October 17, 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, February is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $130). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in April is currently the most expensive (average of $301). 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 October 23, 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 6% on your trip compared to booking a flight at noon.

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 October 19, 2025.

Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Louis flight should consider departing on Tuesday afternoons 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 October 23, 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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Overall

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

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Overall

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

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Overall

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

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Overall

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

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Overall

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

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Overall

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 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 7 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 $118, 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 Delta - these airlines can fly you to your destination from $198 and $259, respectively. You may be able to fly from Phoenix Sky Harbor Intl Airport to St. Louis for 69% 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 (89%), Southwest (85%), American Airlines (75%).

  • 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 $271, our data shows the cheapest flight currently is $70. When looking at the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis), you can expect to pay $92 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, February is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $130). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in April is currently the most expensive (average of $301). 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
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.

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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$230FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$198Average$386FlexibilityNo cancel feeOn-time69%
DeltaCheapest$259Average$352FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$269Average$400FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$277Average$406FlexibilityNo cancel feeOn-time63%

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