$78+ 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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Apr 9 — Apr 161
Round-trip
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
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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 March 10, 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 March 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Mon 4/208:17 pm
STL
- PHX
1 stop29h 25m
Frontier
Fri 4/249:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Deal found 3/6![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 stop5h 35m
Frontier
Sat 5/99:52 am
PHX
- STL
1 stop7h 20m
Frontier
Deal found 3/7![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 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
Sat 4/259:52 am
PHX
- STL
1 stop7h 40m
Frontier
Deal found 3/8![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/138:19 pm
STL
- PHX
1 stop17h 26m
Frontier
Thu 4/166:50 am
PHX
- STL
1 stop10h 31m
Frontier
Deal found 3/10![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 4/154:59 pm
STL
- PHX
1 stop8h 04m
Frontier
Fri 4/179:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Deal found 3/5![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Mon 4/208:17 pm
STL
- PHX
1 stop29h 25m
Frontier
Sat 4/259:52 am
PHX
- STL
1 stop7h 40m
Frontier
Deal found 3/6![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Fri 4/178:06 pm
STL
- PHX
1 stop14h 32m
Frontier
Mon 4/2010:29 pm
PHX
- STL
1 stop30h 21m
Frontier
Deal found 3/6![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/98:12 pm
STL
- PHX
1 stop13h 24m
Frontier
Sun 5/179:24 pm
PHX
- STL
1 stop19h 48m
Frontier
Deal found 3/8![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/88:16 pm
STL
- PHX
1 stop5h 26m
Frontier
Wed 4/156:51 pm
PHX
- STL
1 stop22h 30m
Frontier
Deal found 3/10![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Fri 4/248:06 pm
STL
- PHX
1 stop14h 32m
Frontier
Mon 4/2710:29 pm
PHX
- STL
1 stop30h 21m
Frontier
Deal found 3/9![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/108:16 pm
STL
- PHX
1 stop5h 31m
Frontier
Fri 4/179:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Deal found 3/8![Frontier logo]()
$189
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 March 10, 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 March 10, 2026.
This Southwest deal was found by Cheapflights users on 3/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/208:45 pm
STL
- PHX
Nonstop3h 25m
Southwest
Wed 5/271:55 pm
PHX
- STL
1 stop5h 20m
Southwest
Deal found 3/9![Southwest logo]()
$345
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/17:00 am
STL
- PHX
1 stop18h 52m
Alaska Airlines
Mon 4/66:00 am
PHX
- STL
1 stop15h 59m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$423
This United Airlines deal was found by Cheapflights users on 3/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/62:35 pm
STL
- PHX
1 stop6h 27m
United Airlines
Sat 5/98:00 am
PHX
- STL
2 stops9h 51m
United Airlines
Deal found 3/5![United Airlines logo]()
$440
This Southwest deal was found by Cheapflights users on 3/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:05 am
STL
- PHX
Nonstop3h 25m
Southwest
Thu 4/168:10 am
PHX
- STL
Nonstop3h 05m
Southwest
Deal found 3/6![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/229:40 pm
STL
- PHX
Nonstop3h 25m
Southwest
Sun 5/315:30 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 3/8![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
STL
- PHX
2 stops11h 10m
United Airlines
Tue 6/910:06 am
PHX
- STL
2 stops9h 10m
United Airlines
Deal found 3/6![United Airlines logo]()
$445
This Southwest deal was found by Cheapflights users on 3/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/19:40 pm
STL
- PHX
Nonstop3h 25m
Southwest
Mon 5/42:05 pm
PHX
- STL
1 stop6h 00m
Southwest
Deal found 3/5![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 3/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/199:55 pm
STL
- PHX
Nonstop3h 25m
Southwest
Sun 4/2611:40 pm
PHX
- STL
1 stop6h 00m
Southwest
Deal found 3/5![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 3/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:40 pm
STL
- PHX
Nonstop3h 25m
Southwest
Mon 4/2711:55 pm
PHX
- STL
1 stop5h 50m
Southwest
Deal found 3/5![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 3/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/32:35 pm
STL
- PHX
Nonstop3h 30m
Southwest
Sun 4/55:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 3/6![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/188:50 pm
STL
- PHX
Nonstop3h 30m
Southwest
Mon 3/238:05 pm
PHX
- STL
Nonstop2h 45m
Southwest
Deal found 3/8![Southwest logo]()
$440
Last-minute flights from St. Louis to MesaDiscover last-minute flight deals from St. Louis to Mesa. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Mesa. Data last updated March 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/88:16 pm
STL
- PHX
1 stop5h 26m
Frontier
Wed 4/156:51 pm
PHX
- STL
1 stop22h 30m
Frontier
Deal found 3/10![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/108:16 pm
STL
- PHX
1 stop5h 31m
Frontier
Fri 4/179:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Deal found 3/8![Frontier logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/138:19 pm
STL
- PHX
1 stop17h 26m
Frontier
Thu 4/166:50 am
PHX
- STL
1 stop10h 31m
Frontier
Deal found 3/10![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:59 pm
STL
- PHX
1 stop8h 19m
Frontier
Sat 4/189:52 am
PHX
- STL
1 stop7h 40m
Frontier
Deal found 3/8![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 4/154:59 pm
STL
- PHX
1 stop8h 04m
Frontier
Fri 4/179:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Deal found 3/5![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Fri 4/178:06 pm
STL
- PHX
1 stop14h 32m
Frontier
Mon 4/2010:29 pm
PHX
- STL
1 stop30h 21m
Frontier
Deal found 3/6![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 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
Sat 4/259:52 am
PHX
- STL
1 stop7h 40m
Frontier
Deal found 3/8![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Mon 4/208:17 pm
STL
- PHX
1 stop29h 25m
Frontier
Fri 4/249:24 pm
PHX
- STL
1 stop20h 08m
Frontier
Deal found 3/6![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Mon 4/208:17 pm
STL
- PHX
1 stop29h 25m
Frontier
Sat 4/259:52 am
PHX
- STL
1 stop7h 40m
Frontier
Deal found 3/6![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Fri 4/248:06 pm
STL
- PHX
1 stop14h 32m
Frontier
Mon 4/2710:29 pm
PHX
- STL
1 stop30h 21m
Frontier
Deal found 3/9![Frontier logo]()
$186
This Frontier deal was found by Cheapflights users on 3/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/2611:44 am
STL
- PHX
1 stop11h 40m
Frontier
Sat 5/96:50 am
PHX
- STL
1 stop10h 22m
Frontier
Deal found 3/6![Frontier logo]()
$190
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 March 10, 2026.
Search for one-way flight options from St. Louis to Mesa. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/6. 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.
Fri 4/38:16 pm
STL
- PHX
1 stop23h 31m
Frontier
Deal found 3/6![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/208:17 pm
STL
- PHX
1 stop29h 25m
Frontier
Deal found 3/7![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
Sat 5/98:12 pm
STL
- PHX
1 stop13h 24m
Frontier
Deal found 3/10![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Mon 4/68:19 pm
STL
- PHX
1 stop23h 28m
Frontier
Deal found 3/9![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
Fri 5/88:12 pm
STL
- PHX
1 stop14h 26m
Frontier
Deal found 3/10![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/154:59 pm
STL
- PHX
1 stop8h 04m
Frontier
Deal found 3/7![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 3/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:16 pm
STL
- PHX
1 stop5h 26m
Frontier
Deal found 3/6![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 3/5. 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 Super.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
Deal found 3/5![Frontier logo]()
$99
This Orbitz deal was found by Cheapflights users on 3/8. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:55 pm
STL
- PHX
1 stop19h 17m
Frontier
Deal found 3/8![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 stop29h 36m
Frontier
Deal found 3/7![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 stop19h 49m
Frontier
Deal found 3/7![Frontier logo]()
$103
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 March 10, 2026.
Round-trip from | $166 (Kiwi.com) |
|---|---|
One-way from | $78 (Kiwi.com) |
Popular in | March |
Cheapest in | November |
Average price | $390 |
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 March 10, 2026.
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
Cheapest round-trip
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 5/20
8:45 pm-10:10 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Wed 5/27
1:55 pm-9:15 pm
1 stop5h 20m
$345
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Mon 4/13
6:05 am-7:30 am
Nonstop3h 25m
Phoenix Sky Harbor Intl
Thu 4/16
8:10 am-1:15 pm
Nonstop3h 05m
$375
Quickest round-trip
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 5/22
9:40 pm-11:05 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Sun 5/31
5:30 am-10:20 am
Nonstop2h 50m
$375
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 5/1
9:40 pm-11:05 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Mon 5/4
2:05 pm-10:05 pm
1 stop6h 00m
$385
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Sun 4/19
9:55 pm-11:20 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Sun 4/26
11:40 pm-7:40 am
1 stop6h 00m
$385
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 4/24
9:40 pm-11:05 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Mon 4/27
11:55 pm-7:45 am
1 stop5h 50m
$385
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 4/3
2:35 pm-4:05 pm
Nonstop3h 30m
Phoenix Sky Harbor Intl
Sun 4/5
5:00 am-9:50 am
Nonstop2h 50m
$395
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 4/1
7:00 am-11:52 pm
1 stop18h 52m
Phoenix Sky Harbor Intl
Mon 4/6
6:00 am-11:59 pm
1 stop15h 59m
$423
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 5/6
2:35 pm-7:02 pm
1 stop6h 27m
Phoenix Sky Harbor Intl
Sat 5/9
8:00 am-7:51 pm
2 stops9h 51m
$440
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 3/18
8:50 pm-10:20 pm
Nonstop3h 30m
Phoenix Sky Harbor Intl
Mon 3/23
8:05 pm-12:50 am
Nonstop2h 45m
$440
Showing 1-10 of 23 resultsSorted by cheapest first
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 March 6, 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 $234). 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 March 10, 2026.
It’s optimal to fly from St. Louis to Mesa in the evening. By choosing this option you can save up to 28% 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 21, 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 March 10, 2026.
The most flights from STL to MS9 are scheduled on a Monday (10 on average). You will have fewer flight options on Saturday, 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 March 10, 2026.
Read through reviews of airlines operating flights from St. Louis to Mesa, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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.
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Alternative routes for St. Louis to Mesa
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Mesa by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Mesa by cabin class
Find flights from St. Louis to Mesa, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Mesa flights
Browse other St. Louis and Mesa flight options. Last updated on March 10, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on March 10, 2026.
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Check out other popular destinations found by fellow travelers in 2026
St. Louis to Mesa flights
Consider these flights traveling from St. Louis to Mesa.
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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$210 | 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$377 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$219 | Average$388 | FlexibilityNo cancel fee | On-time63% |