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

Flying on Frontier is currently your cheapest option to Phoenix Sky Harbor Intl Airport, with prices starting at $222. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and Southwest, with the lowest prices starting at $224 and $228, respectively. Frontier is priced at 36% lower than the current average price of a flight leaving 3 months from now.

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

One-way options have recently been found by users for as low as $87 on Spirit Airlines. Other airlines that offer cheap prices include Southwest from $88 and Frontier from $106 one-way.

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

On average you can expect to pay $1,165 for a flight from St. Louis to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $143 while the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl) is currently priced at $175.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to Phoenix Sky Harbor Intl Airport on time: SkyWest Airlines (91%), American Airlines (86%), Alaska Airlines (86%).

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

Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from St. Louis to Phoenix Sky Harbor Intl Airport.

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

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 32% on the overall cost on flights from St. Louis to Phoenix Sky Harbor Intl Airport.

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

The best pricing can be found in the month of July. Prices to Phoenix Sky Harbor Intl Airport from St. Louis average $348. You can even find prices in July for less than $348, as users have found deals to Phoenix Sky Harbor Intl Airport from as low as $108. The month of March appears to be one of the more expensive times to travel to Phoenix Sky Harbor Intl Airport from St. Louis. Flying in the targeted month can save you up to 36%.

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

For a flight from St. Louis to Phoenix Sky Harbor Intl, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 5 outbound flights to Phoenix Sky Harbor Intl per day. 5 airlines have flights to Phoenix Sky Harbor Intl from Lambert-St Louis on a regular basis.

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

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

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

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

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

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

$81+ Flights from St. Louis to Phoenix Sky Harbor Intl Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from St. Louis to Sky Harbor Intl 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 Lambert-St Louis to Phoenix Sky Harbor Intl are usually found in July or August, booked 76 days in advance, depart on a Wednesday or Saturday and return on a Tuesday

Cheap flight deals from St. Louis to Sky Harbor Intl

Round-trip from	$219 (CheapOair)
One-way from	$87 (Mytrip)
Popular in	March
Cheapest in	July
Average price	$280
Good round-trip deal	$321 or less
Good one-way deal	$171 or less

From Lambert-St Louis to Phoenix Sky Harbor Intl

Search Deals

One-way flight from Lambert-St Louis to Phoenix Sky Harbor Intl

Search Deals

Highest demand for flights based on searches. 18% potential increase in price ($80 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in June 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Phoenix Sky Harbor Intl.

Search Deals

Price to beat on a one-way flight from Lambert-St Louis to Phoenix Sky Harbor Intl.

Search Deals

Find flight deals from St. Louis to Sky Harbor Intl

Cheapest flights from St. Louis to Sky Harbor Intl
Explore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.

Thu 9/188:44 amSTL - PHX

1 stop7h 27mMultiple Airlines

Tue 9/236:33 amPHX - STL

1 stop24h 34mMultiple Airlines

Deal found 6/5

$219

Fri 10/37:52 pmSTL - PHX

1 stop5h 37mFrontier

Fri 10/1711:51 pmPHX - STL

1 stop11h 36mFrontier

Deal found 6/5

$222

Fri 6/206:36 pmSTL - PHX

1 stop27h 45mSpirit Airlines

Sun 6/229:46 pmPHX - STL

1 stop18h 32mSpirit Airlines

Deal found 6/5

$224

Wed 10/156:15 amSTL - PHX

Nonstop3h 20mSouthwest

Sat 10/185:40 amPHX - STL

1 stop4h 50mSouthwest

Deal found 6/4

$228

Wed 10/228:07 amSTL - PHX

Nonstop3h 32mAmerican Airlines

Sat 10/2512:15 pmPHX - STL

1 stop9h 34mAmerican Airlines

Deal found 6/5

$253

Tue 8/56:30 amSTL - PHX

1 stop6h 05mDelta

Tue 8/129:55 amPHX - STL

1 stop6h 21mDelta

Deal found 6/4

$259

Thu 9/186:00 amSTL - PHX

1 stop19h 55mAlaska Airlines

Tue 9/2311:28 amPHX - STL

2 stops10h 31mAlaska Airlines

Deal found 6/3

$358

Best flights from St. Louis to Sky Harbor Intl
Discover carefully curated flight deals from St. Louis to Sky Harbor Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 5, 2025.

Thu 9/188:44 amSTL - PHX

1 stop7h 27mMultiple Airlines

Tue 9/236:33 amPHX - STL

1 stop24h 34mMultiple Airlines

Deal found 6/5

$219

Fri 10/37:52 pmSTL - PHX

1 stop5h 37mFrontier

Fri 10/1711:51 pmPHX - STL

1 stop11h 36mFrontier

Deal found 6/5

$222

Fri 6/206:36 pmSTL - PHX

1 stop27h 45mSpirit Airlines

Sun 6/229:46 pmPHX - STL

1 stop18h 32mSpirit Airlines

Deal found 6/5

$224

Wed 10/156:15 amSTL - PHX

Nonstop3h 20mSouthwest

Sat 10/185:40 amPHX - STL

1 stop4h 50mSouthwest

Deal found 6/4

$228

Wed 10/228:07 amSTL - PHX

Nonstop3h 32mAmerican Airlines

Sat 10/2512:15 pmPHX - STL

1 stop9h 34mAmerican Airlines

Deal found 6/5

$253

Tue 8/56:30 amSTL - PHX

1 stop6h 05mDelta

Tue 8/129:55 amPHX - STL

1 stop6h 21mDelta

Deal found 6/4

$259

Tue 8/56:33 amSTL - PHX

1 stop6h 36mUnited Airlines

Tue 8/1210:32 amPHX - STL

2 stops10h 13mUnited Airlines

Deal found 6/4

$344

Thu 9/186:00 amSTL - PHX

1 stop19h 55mAlaska Airlines

Tue 9/2311:28 amPHX - STL

2 stops10h 31mAlaska Airlines

Deal found 6/3

$358

Last-minute flights from St. Louis to Sky Harbor Intl
Discover last-minute flight deals from St. Louis to Sky Harbor Intl. Data last updated June 5, 2025 and is based on user searches.

Tue 6/103:03 pmSTL - PHX

1 stop9h 46mAlaska Airlines

Sat 6/147:00 amPHX - STL

2 stops14h 59mAlaska Airlines

Deal found 6/5

$855

Sat 6/147:29 pmSTL - PHX

1 stop5h 09mMultiple Airlines

Sat 6/219:46 pmPHX - STL

1 stop17h 18mMultiple Airlines

Deal found 6/4

$235

Sat 6/147:29 pmSTL - PHX

1 stop5h 09mFrontier

Fri 6/208:21 pmPHX - STL

1 stop10h 51mFrontier

Deal found 6/4

$254

Sat 6/142:00 pmSTL - PHX

Nonstop3h 15mSouthwest

Fri 6/208:25 pmPHX - STL

Nonstop2h 55mSouthwest

Deal found 6/4

$683

Sat 6/145:00 pmSTL - PHX

1 stop7h 37mDelta

Fri 6/2012:45 amPHX - STL

1 stop7h 47mDelta

Deal found 6/4

$703

Sat 6/147:45 amSTL - PHX

Nonstop3h 18mAmerican Airlines

Sat 6/216:57 pmPHX - STL

Nonstop3h 02mAmerican Airlines

Deal found 6/5

$723

Sat 6/141:42 pmSTL - PHX

1 stop8h 39mUnited Airlines

Sat 6/219:56 amPHX - STL

2 stops10h 49mUnited Airlines

Deal found 6/4

$746

Fri 6/206:36 pmSTL - PHX

1 stop27h 45mSpirit Airlines

Sun 6/229:46 pmPHX - STL

1 stop18h 32mSpirit Airlines

Deal found 6/5

$224

Tue 7/16:10 pmSTL - PHX

Nonstop3h 26mAmerican Airlines

Mon 7/712:38 amPHX - STL

1 stop6h 40mAmerican Airlines

Deal found 6/5

$328

Tue 7/17:15 pmSTL - PHX

1 stop5h 22mDelta

Tue 7/85:20 pmPHX - STL

1 stop5h 18mDelta

Deal found 6/5

$338

Thu 7/1010:47 amSTL - PHX

1 stop13h 47mMultiple Airlines

Mon 7/146:00 amPHX - STL

1 stop5h 42mMultiple Airlines

Deal found 6/4

$227

Wed 7/167:29 pmSTL - PHX

1 stop14h 58mFrontier

Tue 7/222:03 pmPHX - STL

1 stop17h 08mFrontier

Deal found 6/5

$250

One-way flights from St. Louis to Sky Harbor Intl
Search for one-way flight options from St. Louis to Sky Harbor Intl. Find affordable one-way fares based on user searches. Data last updated June 5, 2025.

Mon 6/307:13 pmSTL - PHX

1 stop27h 08mSpirit Airlines

Deal found 6/4

$87

Tue 9/28:45 pmSTL - PHX

Nonstop3h 15mSouthwest

Deal found 6/4

$88

Thu 8/287:52 pmSTL - PHX

1 stop5h 37mFrontier

Deal found 6/5

$106

Sun 8/178:00 amSTL - PHX

2 stops32h 11mMultiple Airlines

Deal found 6/5

$160

Tue 7/157:45 amSTL - PHX

1 stop6h 27mDelta

Deal found 6/5

$169

Tue 7/158:54 amSTL - PHX

2 stops8h 15mUnited Airlines

Deal found 6/5

$174

Fri 8/87:53 amSTL - PHX

Nonstop3h 15mAmerican Airlines

Deal found 6/5

$177

Mon 9/13:35 pmSTL - PHX

2 stops29h 42mAlaska Airlines

Deal found 6/4

$203

Tue 6/107:00 amSTL - PHX

1 stop9h 47mHawaiian Airlines

Deal found 6/5

$445

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Phoenix Sky Harbor Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 9/18

8:44 am-2:11 pm

1 stop7h 27m

Phoenix Sky Harbor Intl

Tue 9/23

6:33 am-9:07 am

1 stop24h 34m

$219

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/3

7:52 pm-11:29 pm

1 stop5h 37m

Phoenix Sky Harbor Intl

Fri 10/17

11:51 pm-1:27 pm

1 stop11h 36m

$222

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 6/20

6:36 pm-8:21 pm

1 stop27h 45m

Phoenix Sky Harbor Intl

Sun 6/22

9:46 pm-6:18 pm

1 stop18h 32m

$224

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/15

6:15 am-7:35 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Sat 10/18

5:40 am-12:30 pm

1 stop4h 50m

$228

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/22

8:07 am-9:39 am

Nonstop3h 32m

Phoenix Sky Harbor Intl

Sat 10/25

12:15 pm-11:49 pm

1 stop9h 34m

$253

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 8/5

6:30 am-10:35 am

1 stop6h 05m

Phoenix Sky Harbor Intl

Tue 8/12

9:55 am-6:16 pm

1 stop6h 21m

$259

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 8/5

6:33 am-11:09 am

1 stop6h 36m

Phoenix Sky Harbor Intl

Tue 8/12

10:32 am-10:45 pm

2 stops10h 13m

$344

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 9/18

6:00 am-11:55 pm

1 stop19h 55m

Phoenix Sky Harbor Intl

Tue 9/23

11:28 am-11:59 pm

2 stops10h 31m

$358

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 7/10

10:47 am-10:34 pm

1 stop13h 47m

$81

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 9/2

8:45 pm-10:00 pm

Nonstop3h 15m

$88

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/5

Showing 1-10 of 16 results

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

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

Airports

STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

PHX

For quick access to downtown, take the light rail from 44th Street Station. It's a 20-minute ride from PHX.

Our travel experts

Brandon Schultz

Expert on PHX

Taryn White

Expert on STL

Best time to book a flight from St. Louis to Sky Harbor Intl

Have a flexible travel schedule? Discover the best time to fly to Sky Harbor Intl from St. Louis with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Booking 14 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Phoenix Sky Harbor Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $258). Flying from St. Louis to Phoenix Sky Harbor Intl Airport in March is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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

When flying from St. Louis to Phoenix Sky Harbor Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 12% versus a flight in the morning.

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

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

Rainfall in Sky Harbor Intl by month

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

Temperature in Sky Harbor Intl by month

If weather is an important factor for your trip to Phoenix Sky Harbor Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 95.0 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 55.4 F).

Reviews of airlines servicing Sky Harbor Intl

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

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,288 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,958 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Hawaiian Airlines

7.9

Good

2,481 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,774 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What airport do you fly from for flights from St. Louis to Phoenix Sky Harbor Intl?
For a flight from St. Louis to Phoenix Sky Harbor Intl, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 5 outbound flights to Phoenix Sky Harbor Intl per day. 5 airlines have flights to Phoenix Sky Harbor Intl from Lambert-St Louis on a regular basis.
What are the cheapest airlines flying from St. Louis to Phoenix Sky Harbor Intl Airport round-trip?
Flying on Frontier is currently your cheapest option to Phoenix Sky Harbor Intl Airport, with prices starting at $222. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and Southwest, with the lowest prices starting at $224 and $228, respectively. Frontier is priced at 36% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from St. Louis to Phoenix Sky Harbor Intl Airport one-way?
One-way options have recently been found by users for as low as $87 on Spirit Airlines. Other airlines that offer cheap prices include Southwest from $88 and Frontier from $106 one-way.
What are the most reliable airlines from St. Louis to Phoenix Sky Harbor Intl Airport?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to Phoenix Sky Harbor Intl Airport on time: SkyWest Airlines (91%), American Airlines (86%), Alaska Airlines (86%).
What are the cheapest flights from St. Louis to Phoenix Sky Harbor Intl Airport?
On average you can expect to pay $1,165 for a flight from St. Louis to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $143 while the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl) is currently priced at $175.
Can I find deals for flights from St. Louis to Sky Harbor Intl that include hotel bookings?
Yes. In addition to deals on St. Louis to Sky Harbor Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Sky Harbor Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Sky Harbor Intl.
Can I find deals for business class flights from St. Louis to Sky Harbor Intl?
Yes. Cheapflights offers flight deals from St. Louis to Sky Harbor Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from St. Louis to Phoenix Sky Harbor Intl Airport?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Phoenix Sky Harbor Intl Airport (average of $258). Flying from St. Louis to Phoenix Sky Harbor Intl Airport in March is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Chandler

Peoria

Buckeye

Glendale

Globe

Goodyear

Payson

Surprise

Camp Verde

Casa Grande

Avondale

Paradise Valley

Guadalupe

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for St. Louis to Sky Harbor Intl

Kansas City to Sky Harbor Intl flights

Springfield to Sky Harbor Intl flights

Joplin to Sky Harbor Intl flights

Columbia to Sky Harbor Intl flights

Cape Girardeau to Sky Harbor Intl flights

Other flights to Sky Harbor Intl

Everett to Sky Harbor Intl flights

Knoxville to Sky Harbor Intl flights

Salt Lake City to Sky Harbor Intl flights

Los Angeles to Sky Harbor Intl flights

Provo to Sky Harbor Intl flights

Seattle to Sky Harbor Intl flights

Phoenix Sky Harbor Intl Airport to San Diego flights

Phoenix Sky Harbor Intl Airport to Missoula flights

Phoenix Sky Harbor Intl Airport to Las Vegas flights

Phoenix Sky Harbor Intl Airport to Santa Ana flights

Phoenix Sky Harbor Intl Airport to Austin flights

Phoenix Sky Harbor Intl Airport to Seattle flights

Phoenix Sky Harbor Intl Airport to Show Low flights

Phoenix Sky Harbor Intl Airport to Los Angeles flights

Phoenix Sky Harbor Intl Airport to Stockton flights

Phoenix Sky Harbor Intl Airport to Salt Lake City flights

Phoenix Sky Harbor Intl Airport to San Francisco flights

Phoenix Sky Harbor Intl Airport to Provo flights

Phoenix Sky Harbor Intl Airport to Everett flights

Phoenix Sky Harbor Intl Airport to Portland flights

Phoenix Sky Harbor Intl Airport to Knoxville flights

Phoenix Sky Harbor Intl Airport to Pasco flights

Phoenix Sky Harbor Intl Airport to Asheville flights

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$103	Average$186	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$151	Average$367	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$216	Average$289	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$218	Average$346	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$290	Average$444	FlexibilityNo cancel fee	On-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$81+ Cheap flights from St. Louis (STL) to Sky Harbor Intl (PHX)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Sky Harbor Intl 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 Lambert-St Louis to Phoenix Sky Harbor Intl are usually found in July or August, booked 76 days in advance, depart on a Wednesday or Saturday and return on a Tuesday

Cheap flight deals from St. Louis to Sky Harbor Intl

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from St. Louis to Sky Harbor Intl

Cheapest flights from St. Louis to Sky Harbor IntlExplore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.

Explore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Phoenix Sky Harbor Intl Airport that are best for you.

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

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

Airports

STL

PHX

Our travel experts

Best time to book a flight from St. Louis to Sky Harbor Intl

Have a flexible travel schedule? Discover the best time to fly to Sky Harbor Intl from St. Louis with our price prediction graph.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Sky Harbor Intl. Price data was last updated on May 23, 2025.

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

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

Find hourly flight availability from St. Louis to Sky Harbor Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 5, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Sky Harbor Intl. Price data was last updated on June 1, 2025.

Rainfall in Sky Harbor Intl by month

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

Temperature in Sky Harbor Intl by month

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

Reviews of airlines servicing Sky Harbor Intl

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

Related info for your journey

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

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

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

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

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

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

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

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

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

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

Traveling to a place near St. Louis?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Sky Harbor Intl

See prices for flight routes from nearby airports that may be better suited for you.

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

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from St. Louis to Sky Harbor Intl
Explore the most affordable flight options available from St. Louis to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.