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 6h 56m. The distance between Phoenix Sky Harbor Intl Airport and St. Louis is about 1258 mi.

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

Currently priced at $120, 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 68% 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 Frontier ($70), United Airlines ($128), and Southwest ($133).

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.

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).

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 $256, our data shows the cheapest flight currently is $80. When looking at the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis), you can expect to pay $156 for that flight.

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%), Alaska Airlines (89%), American Airlines (88%).

What are the most popular airlines that fly from Phoenix Sky Harbor Intl Airport to St. Louis?

Before booking your flight from Phoenix Sky Harbor Intl Airport to St. Louis check out the most popular airlines for this route: Southwest, American Airlines or Frontier.

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.

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.

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.

$59+ Flights from Phoenix Sky Harbor Intl Airport to St. Louis

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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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Cheap 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 December 30, 2025.

Wed 12/315:30 pmPHX - STL

Nonstop2h 58mAmerican Airlines

Thu 1/13:30 pmSTL - PHX

1 stop6h 47mAmerican Airlines

Deal found 12/30

$307

Tue 12/309:49 amPHX - STL

Nonstop3h 07mAmerican Airlines

Tue 1/67:27 amSTL - PHX

Nonstop3h 47mAmerican Airlines

Deal found 12/29

$377

Tue 12/309:15 amPHX - STL

1 stop6h 21mUnited Airlines

Tue 1/64:15 pmSTL - PHX

1 stop6h 39mUnited Airlines

Deal found 12/29

$397

Tue 12/308:45 pmPHX - STL

Nonstop2h 50mSouthwest

Thu 1/15:25 pmSTL - PHX

Nonstop3h 25mSouthwest

Deal found 12/28

$402

Tue 12/309:49 amPHX - STL

Nonstop3h 07mAmerican Airlines

Fri 1/26:44 pmSTL - PHX

1 stop6h 50mAmerican Airlines

Deal found 12/29

$412

Tue 12/304:29 pmPHX - STL

1 stop5h 00mUnited Airlines

Thu 1/16:00 amSTL - PHX

1 stop7h 09mUnited Airlines

Deal found 12/28

$422

Mon 12/298:45 pmPHX - STL

Nonstop2h 50mSouthwest

Wed 12/311:45 pmSTL - PHX

1 stop5h 05mSouthwest

Deal found 12/28

$486

Best flights from Sky Harbor Intl to St. Louis
Discover carefully curated flight deals from Sky Harbor Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 30, 2025.

Sat 2/216:00 amPHX - STL

1 stop6h 56mFrontier

Sun 3/110:11 pmSTL - PHX

1 stop11h 59mFrontier

Deal found 12/29

$170

Thu 2/196:05 amPHX - STL

2 stops16h 18mDelta

Tue 3/36:10 amSTL - PHX

2 stops12h 23mDelta

Deal found 12/28

$274

Sat 2/216:00 amPHX - STL

1 stop6h 56mFrontier

Mon 3/210:11 pmSTL - PHX

1 stop16h 44mFrontier

Deal found 12/29

$170

Mon 1/267:00 amPHX - STL

1 stop4h 50mFrontier

Mon 2/21:40 pmSTL - PHX

1 stop12h 00mFrontier

Deal found 12/29

$182

Fri 2/207:59 pmPHX - STL

2 stops17h 55mDelta

Tue 3/36:10 amSTL - PHX

2 stops12h 23mDelta

Deal found 12/28

$274

Thu 2/196:05 amPHX - STL

2 stops16h 18mDelta

Fri 2/272:22 pmSTL - PHX

2 stops10h 28mDelta

Deal found 12/28

$274

Thu 2/199:30 amPHX - STL

1 stop10h 56mFrontier

Mon 3/28:47 pmSTL - PHX

Nonstop3h 41mFrontier

Deal found 12/30

$260

Thu 2/196:05 amPHX - STL

2 stops16h 18mDelta

Sun 3/16:40 pmSTL - PHX

2 stops20h 07mDelta

Deal found 12/28

$274

Sat 1/3112:05 pmPHX - STL

2 stops10h 20mDelta

Sat 2/711:23 amSTL - PHX

1 stop7h 57mDelta

Deal found 12/27

$295

Thu 1/2912:05 pmPHX - STL

2 stops10h 20mDelta

Sat 2/711:23 amSTL - PHX

1 stop7h 57mDelta

Deal found 12/27

$295

Sat 2/216:55 amPHX - STL

1 stop5h 37mDelta

Sat 2/287:00 amSTL - PHX

2 stops13h 05mDelta

Deal found 12/27

$295

Last-minute flights from Sky Harbor Intl to St. Louis
Discover last-minute flight deals from Sky Harbor Intl to St. Louis. Data last updated December 30, 2025 and is based on user searches.

Thu 1/1510:16 pmPHX - STL

1 stop13h 24mFrontier

Sat 1/173:43 pmSTL - PHX

1 stop8h 46mFrontier

Deal found 12/28

$127

Thu 1/1510:16 pmPHX - STL

1 stop13h 24mFrontier

Mon 1/199:03 pmSTL - PHX

Nonstop3h 41mFrontier

Deal found 12/29

$129

Fri 1/169:30 amPHX - STL

1 stop10h 44mFrontier

Mon 1/199:03 pmSTL - PHX

Nonstop3h 41mFrontier

Deal found 12/27

$154

Tue 1/2010:15 amPHX - STL

2 stops27h 31mFrontier

Sun 1/259:27 pmSTL - PHX

1 stop11h 53mFrontier

Deal found 12/28

$156

Thu 1/2211:47 amPHX - STL

1 stop8h 19mFrontier

Sun 1/259:27 pmSTL - PHX

1 stop11h 53mFrontier

Deal found 12/28

$152

Fri 1/2310:36 pmPHX - STL

1 stop15h 10mFrontier

Mon 1/269:45 pmSTL - PHX

1 stop13h 37mFrontier

Deal found 12/29

$146

Fri 1/239:55 amPHX - STL

2 stops27h 51mFrontier

Thu 1/2910:01 pmSTL - PHX

1 stop11h 19mFrontier

Deal found 12/28

$162

Thu 1/298:36 pmPHX - STL

1 stop23h 12mFrontier

Mon 2/29:45 pmSTL - PHX

1 stop13h 37mFrontier

Deal found 12/29

$133

Thu 1/296:25 pmPHX - STL

1 stop23h 19mFrontier

Thu 2/510:01 pmSTL - PHX

1 stop16h 23mFrontier

Deal found 12/30

$151

Thu 1/2911:47 amPHX - STL

1 stop8h 19mMultiple Airlines

Mon 2/29:45 pmSTL - PHX

2 stops17h 37mMultiple Airlines

Deal found 12/29

$173

Fri 1/3010:36 pmPHX - STL

1 stop15h 10mFrontier

Sun 2/19:32 pmSTL - PHX

1 stop11h 48mFrontier

Deal found 12/28

$134

One-way flights from Sky Harbor Intl to St. Louis
Search for one-way flight options from Sky Harbor Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated December 30, 2025.

Mon 3/23:59 pmPHX - STL

Nonstop2h 53mFrontier

Deal found 12/28

$59

Sat 2/286:00 amPHX - STL

1 stop6h 56mFrontier

Deal found 12/29

$63

Wed 1/218:30 amPHX - STL

1 stop5h 16mFrontier

Deal found 12/29

$66

Tue 1/273:55 pmPHX - STL

1 stop21h 51mFrontier

Deal found 12/29

$68

Fri 2/277:36 pmPHX - STL

1 stop17h 20mFrontier

Deal found 12/30

$72

Mon 2/1611:59 pmPHX - STL

1 stop21h 28mFrontier

Deal found 12/28

$75

Sun 3/17:36 pmPHX - STL

1 stop16h 33mFrontier

Deal found 12/30

$89

Mon 1/269:30 amPHX - STL

1 stop10h 20mFrontier

Deal found 12/28

$90

Thu 2/266:30 amPHX - STL

2 stops13h 56mMultiple Airlines

Deal found 12/28

$95

Sat 1/316:44 pmPHX - STL

1 stop24h 53mFrontier

Deal found 12/29

$96

Tue 3/38:04 pmPHX - STL

2 stops18h 49mFrontier

Deal found 12/30

$100

Find flight deals from Sky Harbor Intl to St. Louis

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$127 (Kiwi.com)
One-way from	$59 (Frontier)
Popular in	April
Cheapest in	November
Average price	$376
Good round-trip deal	$287 or less
Good one-way deal	$115 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.

Search Deals

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. 7% potential increase in price ($31 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 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

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

Fly to

Route

Depart

Return

Price

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 2/21

6:00 am-1:56 pm

1 stop6h 56m

Lambert-St Louis

Sun 3/1

10:11 pm-9:10 am

1 stop11h 59m

$170

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 2/21

6:00 am-1:56 pm

1 stop6h 56m

Lambert-St Louis

Mon 3/2

10:11 pm-1:55 pm

1 stop16h 44m

$170

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 1/26

7:00 am-12:50 pm

1 stop4h 50m

Lambert-St Louis

Mon 2/2

1:40 pm-12:40 am

1 stop12h 00m

$182

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 2/19

9:30 am-9:26 pm

1 stop10h 56m

Lambert-St Louis

Mon 3/2

8:47 pm-11:28 pm

Nonstop3h 41m

$260

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 2/19

6:05 am-11:23 pm

2 stops16h 18m

Lambert-St Louis

Tue 3/3

6:10 am-5:33 pm

2 stops12h 23m

$274

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 2/20

7:59 pm-2:54 pm

2 stops17h 55m

Lambert-St Louis

Tue 3/3

6:10 am-5:33 pm

2 stops12h 23m

$274

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 2/19

6:05 am-11:23 pm

2 stops16h 18m

Lambert-St Louis

Fri 2/27

2:22 pm-11:50 pm

2 stops10h 28m

$274

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 2/19

6:05 am-11:23 pm

2 stops16h 18m

Lambert-St Louis

Sun 3/1

6:40 pm-1:47 pm

2 stops20h 07m

$274

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 1/31

12:05 pm-11:25 pm

2 stops10h 20m

Lambert-St Louis

Sat 2/7

11:23 am-6:20 pm

1 stop7h 57m

$295

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 1/29

12:05 pm-11:25 pm

2 stops10h 20m

Lambert-St Louis

Sat 2/7

11:23 am-6:20 pm

1 stop7h 57m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

Showing 1-10 of 20 results

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

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star
Mytrip	Price Accuracy3 stars	Trust Score*3 stars
Trip.com	Price Accuracy2 stars	Trust Score*3 stars
Cheapfaremart	Price 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?

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 $299). 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?

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 4% 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?

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

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.

STL

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

Our travel experts

Brandon Schultz

Expert on PHX

Taryn White

Expert on STL

Reviews of airlines servicing St. Louis

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

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Southwest

8.0

Very good

4,251 reviews

Southwest

8.0

Very good

4,251 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Delta

7.9

Good

8,014 reviews

Southwest

8.0

Very good

4,251 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

United Airlines

7.4

Good

9,121 reviews

Southwest

8.0

Very good

4,251 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

American Airlines

7.2

Good

11,072 reviews

Southwest

8.0

Very good

4,251 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Frontier

5.7

Fair

3,065 reviews

Southwest

8.0

Very good

4,251 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

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 6h 56m. The distance between Phoenix Sky Harbor Intl Airport and St. Louis is about 1258 mi.
What are the cheapest airlines flying from Phoenix Sky Harbor Intl Airport to St. Louis round-trip?
Currently priced at $120, 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 68% 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 Frontier ($70), United Airlines ($128), and Southwest ($133).
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%), Alaska Airlines (89%), American Airlines (88%).
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 $256, our data shows the cheapest flight currently is $80. When looking at the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis), you can expect to pay $156 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 $299). 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

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Eureka

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Farmington

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Top 5 airlines flying from Sky Harbor Intl to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$120	Average$222	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$198	Average$386	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$229	Average$395	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$259	Average$367	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$262	Average$398	FlexibilityNo cancel fee	On-time63%

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$59+ 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Sky Harbor Intl to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Cheap flight deals from Sky Harbor Intl to St. Louis

Cheapest flights from Sky Harbor Intl to St. LouisExplore 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 December 30, 2025.

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 December 30, 2025.

Find flight deals from Sky Harbor Intl to St. Louis

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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.

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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.

Cheapflights Insights

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

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The best insider tips for Phoenix Sky Harbor Intl Airport to St. Louis flights

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Cheapflights partnered with top experts to bring you the best recommendations for your Phoenix Sky Harbor Intl Airport to St. Louis trip

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Reviews of airlines servicing St. Louis

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.

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?

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

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

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

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

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

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

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

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

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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 December 30, 2025.