$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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from St. Louis to Mesa 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 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 MesaExplore 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 December 23, 2025.
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 December 23, 2025.
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
This Kiwi.com deal was found by Cheapflights users on 12/20. 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.
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
This Frontier deal was found by Cheapflights users on 12/20. 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.
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
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 December 23, 2025.
Round-trip from | $143 (Kiwi.com) |
|---|---|
One-way from | $48 (Kiwi.com) |
Popular in | March |
Cheapest in | November |
Average price | $328 |
Cheapflights Fare Finder
Use the filters below to find and compare flights from St. Louis to Mesa that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 1/31
3:46 pm-8:20 am
2 stops17h 34m
Phoenix Sky Harbor Intl
Wed 2/4
8:30 am-2:46 pm
1 stop5h 16m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 2/4
3:46 pm-11:53 pm
1 stop9h 07m
Phoenix Sky Harbor Intl
Sun 2/8
8:15 am-12:08 pm
Nonstop2h 53m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 2/10
3:49 pm-10:12 pm
1 stop31h 23m
Phoenix Sky Harbor Intl
Sat 2/14
6:00 am-1:56 pm
1 stop6h 56m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sun 3/1
10:11 pm-9:10 am
1 stop11h 59m
Phoenix Sky Harbor Intl
Sun 3/8
5:09 pm-10:02 pm
Nonstop2h 53m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Thu 2/5
10:01 pm-8:20 am
1 stop11h 19m
Phoenix Sky Harbor Intl
Mon 2/9
2:34 pm-8:50 pm
1 stop5h 16m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sun 2/1
1:03 pm-3:44 pm
Nonstop3h 41m
Phoenix Sky Harbor Intl
Mon 2/9
9:30 am-8:50 pm
1 stop10h 20m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 2/20
1:59 pm-12:41 am
1 stop11h 42m
Phoenix Sky Harbor Intl
Tue 2/24
11:59 pm-10:27 pm
1 stop21h 28m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 2/11
3:49 pm-8:12 am
2 stops17h 23m
Phoenix Sky Harbor Intl
Sun 2/15
10:51 pm-1:09 pm
1 stop13h 18m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 2/4
5:55 am-8:35 am
Nonstop3h 40m
Phoenix Sky Harbor Intl
Sat 2/7
9:10 am-5:00 pm
1 stop6h 50m
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 2/10
5:55 am-8:35 am
Nonstop3h 40m
Phoenix Sky Harbor Intl
Sat 2/14
6:55 pm-10:45 pm
Nonstop2h 50m
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.
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 19, 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 December 23, 2025.
It’s optimal to fly from St. Louis to Mesa in the evening. By choosing this option you can save up to 58% 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. 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 December 23, 2025.
The most flights from STL to MS9 are scheduled on a Saturday (14 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 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 December 23, 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.
Entertainment
Food
Boarding
Overall
Comfort
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Boarding
Overall
Comfort
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Boarding
Overall
Comfort
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Boarding
Overall
Comfort
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Boarding
Overall
Comfort
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Boarding
Overall
Comfort
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
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.
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 Mesa
See prices for flight routes from nearby airports that may be better suited for you.
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 December 23, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$204 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$200 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$210 | Average$383 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$216 | Average$386 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$223 | Average$403 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$236 | Average$362 | FlexibilityNo cancel fee | On-timeN/A |