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Mesa

$60+ Cheap flights from St. Louis (STL) to Mesa, AZ

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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Feb 1 — Feb 81
Sun 2/1
Sun 2/8
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Mesa are usually found in November or October, booked 69 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from St. Louis to Mesa

Cheapest flights from St. Louis to Mesa
Explore the most affordable flight options available from St. Louis to Mesa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 2, 2026.

This American Airlines deal was found by Cheapflights users on 12/30. 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.
Wed 12/312:04 pmSTL - PHX
1 stop7h 30mAmerican Airlines
Thu 1/17:56 pmPHX - STL
Nonstop2h 55mAmerican Airlines
Deal found 12/30$307
This United Airlines deal was found by Cheapflights users on 12/30. 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.
Wed 12/316:41 amSTL - PHX
1 stop8h 23mUnited Airlines
Sun 1/44:29 pmPHX - STL
1 stop4h 53mUnited Airlines
Deal found 12/30$382
This American Airlines deal was found by Cheapflights users on 12/30. 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.
Wed 12/314:53 pmSTL - PHX
1 stop7h 55mAmerican Airlines
Sun 1/47:56 pmPHX - STL
Nonstop2h 55mAmerican Airlines
Deal found 12/30$395
This United Airlines deal was found by Cheapflights users on 12/30. 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.
Wed 12/315:02 pmSTL - PHX
1 stop6h 56mUnited Airlines
Thu 1/17:15 amPHX - STL
2 stops13h 28mUnited Airlines
Deal found 12/30$402
This United Airlines deal was found by Cheapflights users on 12/30. 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.
Tue 12/302:45 pmSTL - PHX
1 stop7h 56mUnited Airlines
Sun 1/44:29 pmPHX - STL
1 stop4h 53mUnited Airlines
Deal found 12/30$502
This CheapOair deal was found by Cheapflights users on 12/31. 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.
Wed 12/317:43 pmSTL - PHX
1 stop26h 43mFrontier
Fri 1/212:59 amPHX - STL
1 stop20h 34mFrontier
Deal found 12/31$503
This Southwest deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:20 amSTL - PHX
1 stop6h 25mSouthwest
Sun 1/48:30 pmPHX - STL
Nonstop2h 55mSouthwest
Deal found 12/29$509
This Southwest deal was found by Cheapflights users on 12/31. 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.
Wed 12/315:00 pmSTL - PHX
1 stop6h 35mSouthwest
Sat 1/37:50 amPHX - STL
1 stop6h 15mSouthwest
Deal found 12/31$519

Find flight deals from St. Louis to Mesa

Keep the following information in mind while searching for St. Louis to Mesa flight deals. Data was last updated January 2, 2026.

Round-trip from

$174
(Kiwi.com)

One-way from

$60
(Trip.com)

Popular in

March

Cheapest in

November

Average price

$359
From Lambert-St Louis to Mesa
Search Deals
One-way flight from Lambert-St Louis to Mesa
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Mesa 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 January 2, 2026.
Use the filters below to find and compare flights from St. Louis to Mesa that are best for you.

Fly from

St. Louis

Fly to

Mesa

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/27

4:35 pm-10:14 pm

1 stop6h 39m

Phoenix Sky Harbor Intl

Tue 2/3

12:53 pm-8:58 pm

1 stop7h 05m

$217

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 2/18

1:10 pm-3:40 pm

Nonstop3h 30m

Phoenix Sky Harbor Intl

Wed 2/25

6:30 pm-10:20 pm

Nonstop2h 50m

$297

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 2/25

5:55 am-8:35 am

Nonstop3h 40m

Phoenix Sky Harbor Intl

Sat 2/28

6:00 am-9:50 am

Nonstop2h 50m

$297

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 4/1

6:05 pm-10:09 pm

1 stop6h 04m

Phoenix Sky Harbor Intl

Wed 4/8

12:37 pm-10:28 pm

1 stop7h 51m

$312

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 3/22

5:50 am-7:25 am

Nonstop3h 35m

Phoenix Sky Harbor Intl

Wed 3/25

6:30 pm-11:20 pm

Nonstop2h 50m

$317

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 2/21

5:25 pm-7:55 pm

Nonstop3h 30m

Phoenix Sky Harbor Intl

Mon 2/23

6:40 pm-10:30 pm

Nonstop2h 50m

$317

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 2/19

8:45 pm-11:15 pm

Nonstop3h 30m

Phoenix Sky Harbor Intl

Tue 2/24

1:20 pm-5:10 pm

Nonstop2h 50m

$317

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 2/6

8:45 pm-11:15 pm

Nonstop3h 30m

Phoenix Sky Harbor Intl

Tue 2/10

6:30 pm-10:20 pm

Nonstop2h 50m

$317

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 2/8

7:55 pm-10:25 pm

Nonstop3h 30m

Phoenix Sky Harbor Intl

Tue 2/10

1:20 pm-5:10 pm

Nonstop2h 50m

$317

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 2/19

7:41 am-8:51 pm

2 stops14h 10m

Phoenix Sky Harbor Intl

Tue 2/24

8:38 am-9:05 pm

2 stops11h 27m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/1

Showing 1-10 of 23 results
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Best time to book a flight from St. Louis to Mesa

Have a flexible travel schedule? Discover the best time to fly to Mesa 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 Mesa

How far ahead should I book a flight from St. Louis to Mesa?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Mesa. Price data was last updated on December 26, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Mesa, you should look to book at least 69 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 St. Louis to Mesa?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Mesa (average of $107). Flying from St. Louis to Mesa in June is currently the most expensive (average of $235). 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 MS9?

Find hourly flight availability from St. Louis to Mesa. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 2, 2026.

It’s optimal to fly from St. Louis to Mesa in the evening. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from St. Louis to Mesa?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Mesa. Price data was last updated on December 27, 2025.

Travelers seeking maximum savings on their St. Louis to Mesa flight should consider departing on Friday 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.

Reviews of airlines servicing Mesa

Get insights into the airlines that provide service to Mesa. 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 Mesa. Reviews last updated January 2, 2026.
Read through reviews of airlines operating flights from St. Louis to Mesa, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,254 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

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
4,254 reviews
Southwest
8.0
Very good
4,254 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

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
8,021 reviews
Southwest
8.0
Very good
4,254 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

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
9,132 reviews
Southwest
8.0
Very good
4,254 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

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
11,074 reviews
Southwest
8.0
Very good
4,254 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

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
3,069 reviews
Southwest
8.0
Very good
4,254 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

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

Find useful and relevant information for your journey from St. Louis to Mesa. 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 Mesa?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Mesa from St. Louis. Booking flights from Lambert-St Louis (STL) to Mesa should be relatively easy as there are 3 daily outbound flights to Mesa from 6 different airlines.

  • How long is the flight from St. Louis to Mesa?

    There are many flights that can get you from St. Louis to Mesa in 3h 30m. Fly via United Airlines or Southwest to get the fastest option. The distance from St. Louis to Mesa is about 1258 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from St. Louis to Mesa one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $59. Users have also found prices from $112 and $143 on Delta and Southwest, respectively.

  • What are the most reliable airlines from St. Louis to Mesa?

    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 Mesa on time: Frontier (88%), American Airlines (79%), Alaska Airlines (79%).

  • What are the cheapest flights from St. Louis to Mesa?

    The cheapest flight price from St. Louis to Mesa is $81. On average you can expect to pay $891. The most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), can usually be booked for $146.

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

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

  • How can I find direct flights from St. Louis to Mesa?

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

  • Can I find deals for business class flights from St. Louis to Mesa?

    Yes. Cheapflights offers flight deals from St. Louis to Mesa 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 Mesa?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Mesa (average of $107). Flying from St. Louis to Mesa in June is currently the most expensive (average of $235). 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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Top 6 airlines flying from St. Louis to Mesa

Discover the top 6 airlines that operate flights from St. Louis to Mesa. 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 January 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$202FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$210Average$383FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$215Average$385FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$223Average$404FlexibilityNo cancel feeOn-time63%
DeltaCheapest$236Average$362FlexibilityNo cancel feeOn-timeN/A

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