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Mesa

$37+ 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 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
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 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 November 6, 2025.

Round-trip from

$159
(Kiwi.com)

One-way from

$37
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$328
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. 9% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 6, 2025.

This Trip.com deal was found by Cheapflights users on 11/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:51 pmSTL - PHX
1 stop7h 38mFrontier
Fri 11/2111:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 11/4$159
This CheapOair deal was found by Cheapflights users on 11/5. 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.
Mon 11/179:07 pmSTL - PHX
1 stop26h 17mFrontier
Fri 11/2111:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 11/5$160
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/207:43 pmSTL - PHX
1 stop6h 01mFrontier
Tue 12/2310:26 pmPHX - STL
1 stop16h 58mFrontier
Deal found 11/5$162
This Kiwi.com deal was found by Cheapflights users on 11/6. 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 12/255:19 pmSTL - PHX
1 stop16h 29mFrontier
Mon 12/294:10 pmPHX - STL
Nonstop2h 57mFrontier
Deal found 11/6$163
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/810:47 amSTL - PHX
2 stops14h 34mFrontier
Fri 12/127:25 amPHX - STL
Nonstop2h 57mFrontier
Deal found 11/5$164
This CheapOair deal was found by Cheapflights users on 11/6. 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 12/512:07 pmSTL - PHX
Nonstop3h 31mFrontier
Sat 12/67:43 pmPHX - STL
1 stop15h 29mFrontier
Deal found 11/6$165
This Frontier deal was found by Cheapflights users on 11/5. 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.
Fri 11/2112:01 pmSTL - PHX
1 stop10h 37mFrontier
Mon 12/111:14 amPHX - STL
Nonstop2h 54mFrontier
Deal found 11/5$167
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/37:43 pmSTL - PHX
1 stop13h 23mFrontier
Wed 12/104:32 pmPHX - STL
2 stops17h 35mFrontier
Deal found 11/5$170
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/57:43 pmSTL - PHX
1 stop6h 01mFrontier
Mon 12/86:00 amPHX - STL
2 stops15h 33mFrontier
Deal found 11/5$172
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/41:16 pmSTL - PHX
1 stop6h 15mFrontier
Mon 12/1512:16 pmPHX - STL
2 stops33h 17mFrontier
Deal found 11/5$173
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/154:51 pmSTL - PHX
1 stop7h 38mFrontier
Thu 11/206:00 amPHX - STL
1 stop7h 29mFrontier
Deal found 11/4$174

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 November 6, 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 1/12

8:45 am-11:36 pm

2 stops15h 51m

Phoenix Sky Harbor Intl

Tue 1/20

5:12 pm-10:02 am

1 stop15h 50m

$170

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 2/2

7:43 pm-4:04 pm

1 stop21h 21m

Phoenix Sky Harbor Intl

Sat 2/7

6:54 pm-9:47 am

2 stops13h 53m

$174

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 1/12

8:45 am-11:36 pm

2 stops15h 51m

Phoenix Sky Harbor Intl

Sun 1/18

10:31 pm-10:04 am

1 stop10h 33m

$188

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 11/10

12:09 pm-2:31 pm

Nonstop3h 22m

Phoenix Sky Harbor Intl

Wed 11/12

9:05 pm-9:07 am

1 stop11h 02m

$209

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 12/5

5:34 pm-12:04 am

1 stop7h 30m

Phoenix Sky Harbor Intl

Thu 12/11

12:59 am-9:10 am

1 stop7h 11m

$229

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 12/5

5:34 pm-12:04 am

1 stop7h 30m

Phoenix Sky Harbor Intl

Mon 12/8

6:30 pm-12:48 am

1 stop5h 18m

$239

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/13

11:23 am-10:46 pm

2 stops12h 23m

Phoenix Sky Harbor Intl

Wed 1/21

12:05 pm-11:25 pm

2 stops10h 20m

$274

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/14

7:00 am-5:30 pm

2 stops11h 30m

Phoenix Sky Harbor Intl

Thu 1/22

12:05 pm-11:25 pm

2 stops10h 20m

$274

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/14

7:00 am-5:30 pm

2 stops11h 30m

Phoenix Sky Harbor Intl

Wed 1/21

6:20 am-9:38 pm

2 stops14h 18m

$274

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 1/13

11:23 am-10:46 pm

2 stops12h 23m

Phoenix Sky Harbor Intl

Tue 1/20

6:20 am-9:38 pm

2 stops14h 18m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 20 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 October 31, 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 $122). 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 November 6, 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.

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 November 6, 2025.

The most flights from STL to MS9 are scheduled on a Thursday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 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 November 6, 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
4,241 reviews

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
7.9
Good
8,001 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
9,007 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
11,040 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
3,115 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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 7 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 7h 30m. Fly via Frontier 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 (83%), American Airlines (82%).

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

    The cheapest flight price from St. Louis to Mesa is $69. On average you can expect to pay $409. The most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), can usually be booked for $99.

  • 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 $122). 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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$207FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$158Average$200FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$223Average$386FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$357FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$400FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$248Average$417FlexibilityNo cancel feeOn-time63%

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