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$133+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
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 June or July, booked 89 days in advance, depart on a Wednesday or Friday and return on a Wednesday

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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$265
(Sun Country Air)

One-way from

$133
(Mytrip)

Popular in

January

Cheapest in

June

Average price

$401

Good round-trip deal

$407 or less

Good one-way deal

$264 or less
Provider with most accurate pricing for Phoenix Sky Harbor Intl-Lambert-St Louis flight deals.
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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
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One-way flight from Phoenix Sky Harbor Intl to Lambert-St Louis
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Highest demand for flights based on searches. 22% potential increase in price ($94 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($11 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 Phoenix Sky Harbor Intl to Lambert-St Louis.
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Price to beat on a one-way flight from Phoenix Sky Harbor Intl to Lambert-St Louis.
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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 March 26, 2025.

This Sun Country Air deal was found by Cheapflights users on 3/25. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/156:25 pmPHX - STL
1 stop15h 12mSun Country Air
Sun 5/187:30 amSTL - PHX
1 stop27h 25mSun Country Air
Deal found 3/25$265
This Booking.com deal was found by Cheapflights users on 3/26. 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.
Fri 4/47:51 amPHX - STL
1 stop7h 52mMultiple Airlines
Sun 4/66:35 amSTL - PHX
1 stop12h 54mMultiple Airlines
Deal found 3/26$273
This CheapOair deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/711:24 pmPHX - STL
1 stop22h 22mFrontier
Wed 4/96:51 pmSTL - PHX
1 stop23h 03mFrontier
Deal found 3/26$280
This Mytrip deal was found by Cheapflights users on 3/25. 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.
Wed 4/235:46 pmPHX - STL
2 stops21h 29mSpirit Airlines
Sun 4/276:10 pmSTL - PHX
2 stops24h 31mSpirit Airlines
Deal found 3/25$289
This Delta deal was found by Cheapflights users on 3/26. 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.
Tue 5/1312:45 amPHX - STL
1 stop8h 02mDelta
Tue 5/277:19 pmSTL - PHX
1 stop6h 29mDelta
Deal found 3/26$339
This Southwest deal was found by Cheapflights users on 3/25. 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.
Thu 4/241:45 pmPHX - STL
Nonstop2h 55mSouthwest
Mon 4/289:25 pmSTL - PHX
Nonstop3h 20mSouthwest
Deal found 3/25$359
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/186:54 pmPHX - STL
Nonstop2h 56mAmerican Airlines
Sun 4/206:20 pmSTL - PHX
Nonstop3h 28mAmerican Airlines
Deal found 3/25$384
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/156:00 amPHX - STL
2 stops15h 59mAlaska Airlines
Tue 4/226:30 amSTL - PHX
1 stop19h 29mAlaska Airlines
Deal found 3/24$391
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/156:00 amPHX - STL
1 stop6h 47mUnited Airlines
Tue 5/206:30 amSTL - PHX
2 stops9h 55mUnited Airlines
Deal found 3/24$434

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 March 26, 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 5/15

6:25 pm-11:37 am

1 stop15h 12m

Lambert-St Louis

Sun 5/18

7:30 am-8:55 am

1 stop27h 25m

$265

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 5/1

5:50 am-3:07 pm

1 stop7h 17m

Lambert-St Louis

Sun 5/4

8:00 am-12:30 pm

1 stop6h 30m

$273

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 4/8

7:14 pm-9:06 am

1 stop11h 52m

Lambert-St Louis

Mon 4/14

6:51 pm-11:57 pm

1 stop7h 06m

$278

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 4/23

5:46 pm-5:15 pm

2 stops21h 29m

Lambert-St Louis

Sun 4/27

6:10 pm-4:41 pm

2 stops24h 31m

$289

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 5/13

12:45 am-10:47 am

1 stop8h 02m

Lambert-St Louis

Tue 5/27

7:19 pm-11:48 pm

1 stop6h 29m

$339

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 4/24

1:45 pm-6:40 pm

Nonstop2h 55m

Lambert-St Louis

Mon 4/28

9:25 pm-10:45 pm

Nonstop3h 20m

$359

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 4/18

6:54 pm-11:50 pm

Nonstop2h 56m

Lambert-St Louis

Sun 4/20

6:20 pm-7:48 pm

Nonstop3h 28m

$384

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 4/15

6:00 am-11:59 pm

2 stops15h 59m

Lambert-St Louis

Tue 4/22

6:30 am-11:59 pm

1 stop19h 29m

$391

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 5/15

6:00 am-2:47 pm

1 stop6h 47m

Lambert-St Louis

Tue 5/20

6:30 am-2:25 pm

2 stops9h 55m

$434

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 5/9

9:19 am-9:15 am

2 stops21h 56m

$133

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 18 results
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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 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
MytripPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
FlightnetworkPrice Accuracy-Trust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust 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 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.

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 with wait times under 10 minutes. Check live wait times online to choose the shortest lane.

Read more about PHXby Brandon Schultz
STL

Use the MetroLink light rail for a convenient, economical ride from STL 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

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 March 21, 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 89 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, August is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $311). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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 March 26, 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 54% 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 March 23, 2025.

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

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 March 26, 2025.
To help decide which airline to fly from Phoenix to St. Louis, see what other customers have to say about Southwest, Alaska Airlines and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,789 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 5 daily inbound flights from Phoenix Sky Harbor Intl from 5 different airlines.

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

    Currently priced at $265, Sun Country Air will fly you from Phoenix Sky Harbor Intl Airport to St. Louis and back. In addition to Sun Country Air, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Spirit Airlines - these airlines can fly you to your destination from $278 and $289, respectively. You may be able to fly from Phoenix Sky Harbor Intl Airport to St. Louis for 20% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from Phoenix Sky Harbor Intl Airport to St. Louis are Spirit Airlines ($133), Sun Country Air ($138), and Frontier ($139).

  • 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: American Airlines (91%), Alaska Airlines (91%), SkyWest Airlines (85%).

  • 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 $406, our data shows the cheapest flight currently is $99. When looking at the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis), you can expect to pay $265 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, August is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $311). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Glencoe
Alton
Farmington
Chesterfield

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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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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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$153FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$325FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$290FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$263Average$352FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$302Average$447FlexibilityNo cancel feeOn-time63%
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