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Mesa

$48+ 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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Nov 12 — Nov 191
Wed 11/12
Wed 11/19
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Mesa are usually found in October or November, booked 87 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap 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 October 13, 2025.

Round-trip from

$154
(Kiwi.com)

One-way from

$48
(Kiwi.com)

Popular in

March

Cheapest in

October

Average price

$331
From Lambert-St Louis to Mesa
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One-way flight from Lambert-St Louis to Mesa
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Highest demand for flights based on searches. 8% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 October 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/18:40 pmSTL - PHX
1 stop13h 44mFrontier
Wed 11/511:38 amPHX - STL
2 stops20h 29mFrontier
Deal found 10/12$154
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1712:09 pmSTL - PHX
Nonstop3h 22mFrontier
Fri 11/2111:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 10/12$155
This Booking.com deal was found by Cheapflights users on 10/11. 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.
Sun 11/27:45 pmSTL - PHX
1 stop24h 48mFrontier
Wed 11/59:59 amPHX - STL
1 stop22h 08mFrontier
Deal found 10/11$156
This Kiwi.com deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1710:59 pmSTL - PHX
Nonstop3h 22mFrontier
Mon 10/202:27 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 10/11$157
This Southwest deal was found by Cheapflights users on 10/11. 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.
Sat 11/15:55 pmSTL - PHX
Nonstop3h 20mSouthwest
Tue 11/41:30 pmPHX - STL
Nonstop2h 55mSouthwest
Deal found 10/11$159
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/283:53 pmSTL - PHX
Nonstop3h 33mFrontier
Fri 12/59:11 pmPHX - STL
2 stops11h 51mFrontier
Deal found 10/12$161
This Booking.com deal was found by Cheapflights users on 10/12. 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 10/247:52 pmSTL - PHX
1 stop28h 03mFrontier
Fri 10/316:00 amPHX - STL
1 stop7h 57mFrontier
Deal found 10/12$162
This Kiwi.com deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:45 pmSTL - PHX
1 stop13h 39mFrontier
Sat 11/154:39 pmPHX - STL
2 stops15h 28mFrontier
Deal found 10/11$164
This Booking.com deal was found by Cheapflights users on 10/12. 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.
Thu 11/209:54 pmSTL - PHX
1 stop11h 25mFrontier
Mon 11/2411:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 10/12$165
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/138:21 pmSTL - PHX
Nonstop3h 22mFrontier
Fri 10/245:15 pmPHX - STL
Nonstop2h 59mFrontier
Deal found 10/12$168
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:26 pmSTL - PHX
2 stops24h 31mFrontier
Tue 12/164:12 pmPHX - STL
1 stop16h 50mFrontier
Deal found 10/12$170

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 October 13, 2025.
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

Mon 11/10

5:20 am-7:45 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Tue 11/11

6:30 pm-10:20 pm

Nonstop2h 50m

$244

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 12/16

1:50 pm-4:15 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Thu 1/8

12:05 pm-5:10 pm

1 stop4h 05m

$244

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 11/19

12:49 pm-5:48 pm

1 stop5h 59m

Phoenix Sky Harbor Intl

Mon 11/24

12:59 am-8:55 am

1 stop6h 56m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 11/26

10:45 pm-1:10 am

Nonstop3h 25m

Phoenix Sky Harbor Intl

Tue 12/2

12:05 pm-5:15 pm

1 stop4h 10m

$294

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 11/14

7:47 pm-12:36 am

1 stop5h 49m

Phoenix Sky Harbor Intl

Fri 11/21

6:27 pm-12:46 am

1 stop5h 19m

$297

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/1

5:30 pm-9:43 pm

1 stop6h 13m

Phoenix Sky Harbor Intl

Wed 11/5

12:59 am-8:37 am

1 stop6h 38m

$308

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/22

4:43 pm-9:41 pm

1 stop5h 58m

Phoenix Sky Harbor Intl

Tue 11/25

9:25 am-6:47 pm

1 stop8h 22m

$317

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 12/3

5:50 pm-10:35 pm

1 stop5h 45m

Phoenix Sky Harbor Intl

Sun 12/7

6:30 am-10:20 am

Nonstop2h 50m

$318

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 10/23

5:15 am-6:35 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Mon 10/27

6:55 pm-11:50 pm

Nonstop2h 55m

$329

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 12/23

7:06 pm-12:31 am

1 stop6h 25m

Phoenix Sky Harbor Intl

Sun 12/28

1:20 pm-10:16 pm

1 stop7h 56m

$337

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/11

Showing 1-10 of 19 results
1
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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 October 10, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Mesa, 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 St. Louis to Mesa?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Mesa (average of $118). 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 October 13, 2025.

It’s optimal to fly from St. Louis to Mesa in the evening. By choosing this option you can save up to 56% on the cost of your flight, compared to a flight at noon.

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 16, 2024.

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. Saturday afternoons 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 October 13, 2025.
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
4,235 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,971 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,970 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,046 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,137 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from 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 8 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 25m. Fly via Southwest or Delta 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 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: SkyWest Airlines (100%), Alaska Airlines (92%), American Airlines (91%).

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

    The cheapest flight price from St. Louis to Mesa is $104. On average you can expect to pay $305. The most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), can usually be booked for $132.

  • 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 $118). 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

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.

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 October 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$104Average$208FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
DeltaCheapest$236Average$357FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$247Average$404FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$257Average$422FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$294Average$391FlexibilityNo cancel feeOn-time69%

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