$58+ 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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Mar 24 — Mar 311
1 adult, Economy
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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 24 days in advance, depart on a Wednesday or Friday and return on a Friday
Cheap flight deals from St. Louis to Mesa
Cheapest
Best
Last-minute
One-way
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 February 22, 2026.
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 February 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/22. 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.
Sun 3/2910:49 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 3/316:45 pm
PHX
- STL
1 stop13h 03m
Frontier
Deal found 2/22![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 2/22. 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.
Mon 5/118:12 pm
STL
- PHX
1 stop23h 31m
Frontier
Sun 5/179:24 pm
PHX
- STL
1 stop19h 48m
Frontier
Deal found 2/22![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 3/235:46 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 3/316:45 pm
PHX
- STL
1 stop13h 03m
Frontier
Deal found 2/21![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 5/28:17 pm
STL
- PHX
1 stop13h 19m
Frontier
Mon 5/46:50 am
PHX
- STL
1 stop10h 42m
Frontier
Deal found 2/19![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 2/22. 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.
Tue 3/2412:14 pm
STL
- PHX
1 stop10h 04m
Frontier
Tue 3/316:45 pm
PHX
- STL
1 stop13h 03m
Frontier
Deal found 2/22![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Thu 3/1910:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 3/246:50 am
PHX
- STL
1 stop24h 59m
Frontier
Deal found 2/20![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Mon 3/235:46 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 4/76:52 pm
PHX
- STL
1 stop12h 56m
Frontier
Deal found 2/20![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 3/238:12 pm
STL
- PHX
1 stop19h 49m
Frontier
Sun 3/295:11 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/21![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 2/19. 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.
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Thu 3/125:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/19![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 4/612:22 pm
STL
- PHX
1 stop28h 11m
Frontier
Sat 4/117:25 am
PHX
- STL
Nonstop2h 56m
Frontier
Deal found 2/19![Frontier logo]()
$169
Best flights from St. Louis to MesaDiscover carefully curated flight deals from St. Louis to Mesa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 22, 2026.
Discover carefully curated flight deals from St. Louis to Mesa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 22, 2026.
This Southwest deal was found by Cheapflights users on 2/21. 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 3/215:15 am
STL
- PHX
1 stop6h 05m
Southwest
Tue 3/245:55 am
PHX
- STL
Nonstop2h 45m
Southwest
Deal found 2/21![Southwest logo]()
$329
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Sat 5/166:51 pm
STL
- PHX
1 stop6h 42m
United Airlines
Sat 5/237:07 am
PHX
- STL
1 stop6h 39m
United Airlines
Deal found 2/18![United Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 2/22. 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.
Tue 3/171:00 pm
STL
- PHX
2 stops10h 46m
Frontier
Thu 3/199:24 pm
PHX
- STL
1 stop10h 25m
Frontier
Deal found 2/22![Frontier logo]()
$350
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:20 am
STL
- PHX
1 stop8h 14m
Delta
Thu 6/45:22 pm
PHX
- STL
1 stop5h 08m
Delta
Deal found 2/20![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 2/21. 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.
Fri 5/156:05 am
STL
- PHX
Nonstop3h 25m
Southwest
Tue 5/1911:10 am
PHX
- STL
1 stop4h 45m
Southwest
Deal found 2/21![Southwest logo]()
$341
This Southwest deal was found by Cheapflights users on 2/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1112:50 pm
STL
- PHX
1 stop6h 20m
Southwest
Wed 6/175:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/20![Southwest logo]()
$345
This Southwest deal was found by Cheapflights users on 2/19. 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 7/88:00 am
STL
- PHX
1 stop6h 40m
Southwest
Sun 7/125:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/19![Southwest logo]()
$345
This Southwest deal was found by Cheapflights users on 2/18. 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 4/158:45 pm
STL
- PHX
Nonstop3h 25m
Southwest
Mon 4/2011:55 pm
PHX
- STL
1 stop5h 50m
Southwest
Deal found 2/18![Southwest logo]()
$345
This Southwest deal was found by Cheapflights users on 2/21. 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.
Sun 5/248:30 pm
STL
- PHX
Nonstop3h 25m
Southwest
Thu 5/284:10 pm
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 2/21![Southwest logo]()
$355
This Southwest deal was found by Cheapflights users on 2/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/25:15 am
STL
- PHX
Nonstop3h 35m
Southwest
Mon 4/68:05 pm
PHX
- STL
Nonstop2h 45m
Southwest
Deal found 2/22![Southwest logo]()
$355
This Southwest deal was found by Cheapflights users on 2/19. 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 8/188:25 am
STL
- PHX
1 stop5h 50m
Southwest
Thu 8/204:55 pm
PHX
- STL
1 stop5h 40m
Southwest
Deal found 2/19![Southwest logo]()
$355
This Southwest deal was found by Cheapflights users on 2/19. 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.
Mon 5/186:05 am
STL
- PHX
Nonstop3h 25m
Southwest
Fri 6/125:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 2/19![Southwest logo]()
$355
Last-minute flights from St. Louis to MesaDiscover last-minute flight deals from St. Louis to Mesa. Data last updated February 22, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Mesa. Data last updated February 22, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 2/21. 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.
Sun 3/810:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Thu 3/125:09 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/21![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Thu 3/1910:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 3/246:50 am
PHX
- STL
1 stop24h 59m
Frontier
Deal found 2/20![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 3/208:12 pm
STL
- PHX
1 stop23h 34m
Frontier
Tue 3/246:50 am
PHX
- STL
1 stop24h 59m
Frontier
Deal found 2/19![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 3/218:12 pm
STL
- PHX
1 stop13h 30m
Frontier
Tue 3/246:50 am
PHX
- STL
1 stop24h 59m
Frontier
Deal found 2/21![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 3/235:46 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 3/316:45 pm
PHX
- STL
1 stop13h 03m
Frontier
Deal found 2/21![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Mon 3/235:46 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 4/76:52 pm
PHX
- STL
1 stop12h 56m
Frontier
Deal found 2/20![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 3/238:12 pm
STL
- PHX
1 stop19h 49m
Frontier
Sun 3/295:11 pm
PHX
- STL
Nonstop2h 53m
Frontier
Deal found 2/21![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 2/22. 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.
Tue 3/2412:14 pm
STL
- PHX
1 stop10h 04m
Frontier
Tue 3/316:45 pm
PHX
- STL
1 stop13h 03m
Frontier
Deal found 2/22![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/22. 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.
Sun 3/2910:49 pm
STL
- PHX
Nonstop3h 41m
Frontier
Tue 3/316:45 pm
PHX
- STL
1 stop13h 03m
Frontier
Deal found 2/22![Frontier logo]()
$152
One-way flights from St. Louis to MesaSearch for one-way flight options from St. Louis to Mesa. Find affordable one-way fares based on user searches. Data last updated February 22, 2026.
Search for one-way flight options from St. Louis to Mesa. Find affordable one-way fares based on user searches. Data last updated February 22, 2026.
This Super.com deal was found by Cheapflights users on 2/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/111:06 pm
STL
- PHX
Nonstop3h 35m
Frontier
Deal found 2/20![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Sat 4/188:17 pm
STL
- PHX
1 stop13h 19m
Frontier
Deal found 2/20![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 3/308:12 pm
STL
- PHX
1 stop17h 42m
Frontier
Deal found 2/19![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Mon 3/238:12 pm
STL
- PHX
1 stop19h 49m
Frontier
Deal found 2/20![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Fri 4/38:16 pm
STL
- PHX
1 stop17h 29m
Frontier
Deal found 2/20![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Fri 4/178:06 pm
STL
- PHX
1 stop14h 32m
Frontier
Deal found 2/20![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 5/88:12 pm
STL
- PHX
1 stop14h 26m
Frontier
Deal found 2/19![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 2/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1910:47 pm
STL
- PHX
Nonstop3h 41m
Frontier
Deal found 2/19![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 4/238:06 pm
STL
- PHX
1 stop26h 10m
Frontier
Deal found 2/21![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 2/20. 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.
Tue 4/214:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Deal found 2/20![Frontier logo]()
$95
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 February 22, 2026.
Round-trip from | $150 (Kiwi.com) |
|---|---|
One-way from | $58 (Super.com) |
Popular in | March |
Cheapest in | November |
Average price | $346 |
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 February 22, 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
Sat 3/21
5:15 am-9:20 am
1 stop6h 05m
Phoenix Sky Harbor Intl
Tue 3/24
5:55 am-10:40 am
Nonstop2h 45m
$329
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sat 5/16
6:51 pm-11:33 pm
1 stop6h 42m
Phoenix Sky Harbor Intl
Sat 5/23
7:07 am-3:46 pm
1 stop6h 39m
$335
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 5/15
6:05 am-7:30 am
Nonstop3h 25m
Phoenix Sky Harbor Intl
Tue 5/19
11:10 am-5:55 pm
1 stop4h 45m
$341
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Thu 6/11
12:50 pm-5:10 pm
1 stop6h 20m
Phoenix Sky Harbor Intl
Wed 6/17
5:00 am-9:50 am
Nonstop2h 50m
$345
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 7/8
8:00 am-12:40 pm
1 stop6h 40m
Phoenix Sky Harbor Intl
Sun 7/12
5:00 am-9:50 am
Nonstop2h 50m
$345
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 4/15
8:45 pm-10:10 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Mon 4/20
11:55 pm-7:45 am
1 stop5h 50m
$345
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 3/17
1:00 pm-9:46 pm
2 stops10h 46m
Phoenix Sky Harbor Intl
Thu 3/19
9:24 pm-9:49 am
1 stop10h 25m
$350
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 5/27
6:20 am-12:34 pm
1 stop8h 14m
Phoenix Sky Harbor Intl
Thu 6/4
5:22 pm-12:30 am
1 stop5h 08m
$355
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sun 5/24
8:30 pm-9:55 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Thu 5/28
4:10 pm-9:05 pm
Nonstop2h 55m
$355
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Thu 4/2
5:15 am-6:50 am
Nonstop3h 35m
Phoenix Sky Harbor Intl
Mon 4/6
8:05 pm-12:50 am
Nonstop2h 45m
$355
Showing 1-10 of 23 results
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.
STL-PHX
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
STL-MS9
STL-PHX
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 February 20, 2026.
To ensure you get the cheapest price possible for a flight from St. Louis to Mesa, you should look to book at least 24 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, February is the cheapest month in which you can book a flight from St. Louis to Mesa (average of $105). Flying from St. Louis to Mesa in June is currently the most expensive (average of $236). 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 February 22, 2026.
It’s optimal to fly from St. Louis to Mesa in the evening. By choosing this option you can save up to 26% 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 February 17, 2026.
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 February 22, 2026.
The most flights from STL to MS9 are scheduled on a Friday (14 on average). You will have fewer flight options on Tuesday, 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 February 22, 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.
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,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.
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St. Louis and Mesa flights
Browse other St. Louis and Mesa flight options. Last updated on February 22, 2026.
Other flights from St. Louis
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St. Louis to Mesa flights
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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 February 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$93 | Average$206 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$121 | Average$200 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$141 | Average$336 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$148 | Average$386 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$210 | Average$380 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$218 | Average$392 | FlexibilityNo cancel fee | On-time63% |