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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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Mesa are usually found in September or November, booked 76 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 September 11, 2025.

Round-trip from

$156
(Booking.com)

One-way from

$60
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$317
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. 8% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This Booking.com deal was found by Cheapflights users on 9/8. 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 10/57:55 pmSTL - PHX
1 stop14h 05mFrontier
Fri 10/107:59 pmPHX - STL
1 stop11h 08mFrontier
Deal found 9/8$156
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Thu 10/306:22 pmSTL - PHX
1 stop6h 18mFrontier
Wed 11/56:11 pmPHX - STL
1 stop13h 56mFrontier
Deal found 9/9$157
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/209:59 pmSTL - PHX
1 stop16h 07mFrontier
Sun 10/268:03 pmPHX - STL
1 stop13h 40mFrontier
Deal found 9/10$158
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Wed 10/157:52 pmSTL - PHX
1 stop14h 07mFrontier
Tue 10/281:16 pmPHX - STL
1 stop17h 51mFrontier
Deal found 9/10$159
This Southwest deal was found by Cheapflights users on 9/10. 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.
Tue 10/216:15 amSTL - PHX
Nonstop3h 20mSouthwest
Fri 10/245:25 amPHX - STL
Nonstop2h 50mSouthwest
Deal found 9/10$160
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/27:45 pmSTL - PHX
1 stop5h 44mFrontier
Thu 11/67:01 amPHX - STL
1 stop5h 56mFrontier
Deal found 9/11$161
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:49 amSTL - PHX
1 stop10h 21mFrontier
Sun 10/56:00 amPHX - STL
1 stop7h 04mFrontier
Deal found 9/11$162
This CheapOair deal was found by Cheapflights users on 9/10. 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.
Fri 9/267:55 pmSTL - PHX
1 stop22h 07mFrontier
Wed 10/112:39 pmPHX - STL
1 stop18h 27mFrontier
Deal found 9/10$163
This Booking.com deal was found by Cheapflights users on 9/9. 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 10/1010:59 pmSTL - PHX
Nonstop3h 22mFrontier
Tue 10/146:33 amPHX - STL
1 stop24h 34mFrontier
Deal found 9/9$164
This Southwest deal was found by Cheapflights users on 9/10. 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 10/305:15 amSTL - PHX
Nonstop3h 20mSouthwest
Wed 11/58:25 amPHX - STL
Nonstop2h 55mSouthwest
Deal found 9/10$166
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Tue 10/147:52 pmSTL - PHX
1 stop21h 12mFrontier
Wed 10/296:11 pmPHX - STL
1 stop12h 56mFrontier
Deal found 9/10$168
This Southwest deal was found by Cheapflights users on 9/11. 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.
Tue 10/216:35 amSTL - PHX
1 stop6h 05mSouthwest
Wed 10/225:10 amPHX - STL
Nonstop2h 50mSouthwest
Deal found 9/11$169

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 September 11, 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

Wed 10/8

9:50 am-11:10 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Wed 10/29

5:10 am-10:00 am

Nonstop2h 50m

$159

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/21

6:35 am-10:40 am

1 stop6h 05m

Phoenix Sky Harbor Intl

Wed 10/22

5:10 am-10:00 am

Nonstop2h 50m

$169

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 12/4

5:25 pm-7:50 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Mon 12/8

6:30 pm-10:20 pm

Nonstop2h 50m

$209

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 1/17

2:45 pm-7:40 pm

1 stop5h 55m

Phoenix Sky Harbor Intl

Tue 1/20

6:55 am-10:45 am

Nonstop2h 50m

$209

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 1/24

7:40 am-10:15 am

Nonstop3h 35m

Phoenix Sky Harbor Intl

Sat 1/31

7:40 am-5:00 pm

1 stop8h 20m

$213

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 10/4

6:20 am-7:40 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Mon 10/13

6:55 pm-11:50 pm

Nonstop2h 55m

$215

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/24

5:15 am-6:35 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Mon 10/27

6:55 pm-11:50 pm

Nonstop2h 55m

$223

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/22

7:30 pm-11:38 pm

1 stop6h 08m

Phoenix Sky Harbor Intl

Sat 10/25

2:01 pm-11:06 pm

1 stop7h 05m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/29

4:45 pm-11:04 pm

1 stop8h 19m

Phoenix Sky Harbor Intl

Fri 10/31

12:40 am-8:51 am

1 stop6h 11m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 11/6

7:40 pm-12:38 am

1 stop5h 58m

Phoenix Sky Harbor Intl

Fri 11/7

12:59 am-8:51 am

1 stop6h 52m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 19 results
1
2

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 August 29, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Mesa, you should look to book at least 76 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, January is the cheapest month in which you can book a flight from St. Louis to Mesa (average of $258). Flying from St. Louis to Mesa 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 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 September 11, 2025.

When flying from St. Louis to Mesa, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 Wednesday at noon 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.

Weekly flight availability from St. Louis to Mesa

Explore weekly flight availability from St. Louis to Mesa. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 11, 2025.

The most flights from STL to MS9 are scheduled on a Wednesday (10 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (1 on average).

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 September 11, 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
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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 6 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 20m. Fly via Southwest to get the fastest option. The distance from St. Louis to Mesa is about 1258 mi. Generally, flights for this route are nonstop.

  • 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 (75%), Southwest (69%), American Airlines (60%).

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

    The cheapest flight price from St. Louis to Mesa is $103. On average you can expect to pay $297. The most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), can usually be booked for $129.

  • 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, January is the cheapest month in which you can book a flight from St. Louis to Mesa (average of $258). Flying from St. Louis to Mesa 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

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$210FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
DeltaCheapest$236Average$362FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$264Average$417FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$277Average$437FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$294Average$446FlexibilityNo cancel feeOn-time69%

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