$83+ Cheap flights from St. Louis (STL) to Phoenix
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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Jun 6 — Jun 131
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Phoenix 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 Phoenix 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 Phoenix
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Best
Last-minute
One-way
Cheapest flights from St. Louis to PhoenixExplore the most affordable flight options available from St. Louis to Phoenix. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 7, 2026.
Explore the most affordable flight options available from St. Louis to Phoenix. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 7, 2026.
This Frontier deal was found by Cheapflights users on 5/6. 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 6/177:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Sat 6/206:24 am
PHX
- STL
1 stop10h 10m
Frontier
Deal found 5/6![Frontier logo]()
$230
This Frontier deal was found by Cheapflights users on 5/3. 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 5/196:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Thu 5/217:40 am
PHX
- STL
1 stop10h 31m
Frontier
Deal found 5/3![Frontier logo]()
$235
This Orbitz deal was found by Cheapflights users on 5/5. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:51 pm
STL
- PHX
1 stop18h 32m
Frontier
Sun 6/75:15 am
PHX
- STL
1 stop12h 08m
Frontier
Deal found 5/5![Frontier logo]()
$236
This Frontier deal was found by Cheapflights users on 5/6. 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.
Sat 7/118:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Sat 7/186:40 am
PHX
- STL
1 stop10h 43m
Frontier
Deal found 5/6![Frontier logo]()
$238
This Kiwi.com deal was found by Cheapflights users on 5/4. 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.
Tue 5/268:08 pm
STL
- PHX
1 stop15h 57m
Frontier
Fri 5/296:51 pm
PHX
- STL
2 stops22h 40m
Frontier
Deal found 5/4![Frontier logo]()
$239
This Expedia deal was found by Cheapflights users on 5/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Tue 5/2610:27 pm
PHX
- STL
1 stop17h 39m
Frontier
Deal found 5/5![Frontier logo]()
$240
This Trip.com deal was found by Cheapflights users on 5/6. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/174:52 pm
STL
- PHX
1 stop7h 26m
Frontier
Tue 7/2110:27 pm
PHX
- STL
1 stop17h 38m
Frontier
Deal found 5/6![Frontier logo]()
$241
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 6/66:30 pm
STL
- PHX
1 stop6h 54m
Frontier
Tue 6/911:32 am
PHX
- STL
2 stops29h 51m
Frontier
Deal found 5/4![Frontier logo]()
$242
This Expedia deal was found by Cheapflights users on 5/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Mon 8/104:48 pm
PHX
- STL
1 stop24h 35m
Frontier
Deal found 5/6![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 6/36:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Mon 6/810:27 pm
PHX
- STL
2 stops42h 56m
Frontier
Deal found 5/5![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 5/6. 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 6/49:06 pm
STL
- PHX
1 stop16h 17m
Frontier
Tue 6/911:21 am
PHX
- STL
1 stop6h 02m
Frontier
Deal found 5/6![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Tue 6/26:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Sat 6/612:29 pm
PHX
- STL
2 stops27h 04m
Frontier
Deal found 5/6![Frontier logo]()
$247
Best flights from St. Louis to PhoenixDiscover carefully curated flight deals from St. Louis to Phoenix that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 7, 2026.
Discover carefully curated flight deals from St. Louis to Phoenix that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 7, 2026.
This Southwest deal was found by Cheapflights users on 5/6. 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.
Tue 9/2911:55 am
STL
- PHX
Nonstop3h 10m
Southwest
Sat 10/37:20 am
PHX
- STL
1 stop5h 00m
Southwest
Deal found 5/6![Southwest logo]()
$385
This Delta deal was found by Cheapflights users on 5/2. 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 10/216:59 pm
STL
- PHX
1 stop6h 43m
Delta
Tue 10/2710:05 am
PHX
- STL
1 stop5h 51m
Delta
Deal found 5/2![Delta logo]()
$395
This Southwest deal was found by Cheapflights users on 5/2. 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 6/16:00 pm
STL
- PHX
Nonstop3h 25m
Southwest
Sat 6/68:05 pm
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 5/2![Southwest logo]()
$396
This Delta deal was found by Cheapflights users on 5/2. 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.
Thu 10/226:59 pm
STL
- PHX
1 stop6h 43m
Delta
Wed 10/285:20 pm
PHX
- STL
1 stop5h 16m
Delta
Deal found 5/2![Delta logo]()
$425
This Southwest deal was found by Cheapflights users on 5/6. 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 5/296:05 am
STL
- PHX
Nonstop3h 25m
Southwest
Mon 6/15:15 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 5/6![Southwest logo]()
$396
This Southwest deal was found by Cheapflights users on 5/6. 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.
Wed 5/276:35 am
STL
- PHX
1 stop5h 40m
Southwest
Mon 6/15:15 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 5/6![Southwest logo]()
$406
This Southwest deal was found by Cheapflights users on 5/3. 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 6/25:35 am
STL
- PHX
1 stop5h 45m
Southwest
Thu 6/45:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 5/3![Southwest logo]()
$406
This Southwest deal was found by Cheapflights users on 5/6. 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.
Thu 5/282:25 pm
STL
- PHX
Nonstop3h 25m
Southwest
Mon 6/15:35 am
PHX
- STL
1 stop5h 35m
Southwest
Deal found 5/6![Southwest logo]()
$406
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:00 pm
STL
- PHX
Nonstop3h 25m
Southwest
Wed 6/34:20 pm
PHX
- STL
Nonstop2h 50m
Southwest
Deal found 5/7![Southwest logo]()
$406
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/167:50 am
STL
- PHX
Nonstop3h 10m
Southwest
Wed 7/224:50 pm
PHX
- STL
1 stop4h 50m
Southwest
Deal found 5/7![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 5/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:00 am
STL
- PHX
1 stop5h 45m
Southwest
Wed 10/287:45 am
PHX
- STL
Nonstop2h 55m
Southwest
Deal found 5/4![Southwest logo]()
$415
Last-minute flights from St. Louis to PhoenixDiscover last-minute flight deals from St. Louis to Phoenix. Data last updated May 7, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Phoenix. Data last updated May 7, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 5/3. 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 5/196:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Thu 5/217:40 am
PHX
- STL
1 stop10h 31m
Frontier
Deal found 5/3![Frontier logo]()
$235
This Expedia deal was found by Cheapflights users on 5/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Tue 5/2610:27 pm
PHX
- STL
1 stop17h 39m
Frontier
Deal found 5/5![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 5/4. 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.
Tue 5/268:08 pm
STL
- PHX
1 stop15h 57m
Frontier
Fri 5/296:51 pm
PHX
- STL
2 stops22h 40m
Frontier
Deal found 5/4![Frontier logo]()
$239
This Frontier deal was found by Cheapflights users on 5/5. 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.
Thu 5/288:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Mon 6/17:40 am
PHX
- STL
1 stop10h 31m
Frontier
Deal found 5/5![Frontier logo]()
$238
This Frontier deal was found by Cheapflights users on 5/6. 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.
Thu 5/288:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Sun 5/316:00 am
PHX
- STL
1 stop6h 31m
Frontier
Deal found 5/6![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Tue 6/26:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Sat 6/612:29 pm
PHX
- STL
2 stops27h 04m
Frontier
Deal found 5/6![Frontier logo]()
$247
This Orbitz deal was found by Cheapflights users on 5/5. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:51 pm
STL
- PHX
1 stop18h 32m
Frontier
Sun 6/75:15 am
PHX
- STL
1 stop12h 08m
Frontier
Deal found 5/5![Frontier logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 6/36:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Mon 6/810:27 pm
PHX
- STL
2 stops42h 56m
Frontier
Deal found 5/5![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 5/6. 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 6/49:06 pm
STL
- PHX
1 stop16h 17m
Frontier
Tue 6/911:21 am
PHX
- STL
1 stop6h 02m
Frontier
Deal found 5/6![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 6/46:33 pm
STL
- PHX
2 stops18h 12m
Frontier
Mon 6/812:05 pm
PHX
- STL
1 stop28h 29m
Frontier
Deal found 5/3![Frontier logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 6/66:30 pm
STL
- PHX
1 stop6h 54m
Frontier
Tue 6/911:32 am
PHX
- STL
2 stops29h 51m
Frontier
Deal found 5/4![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 5/6. 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 6/177:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Sat 6/206:24 am
PHX
- STL
1 stop10h 10m
Frontier
Deal found 5/6![Frontier logo]()
$230
One-way flights from St. Louis to PhoenixSearch for one-way flight options from St. Louis to Phoenix. Find affordable one-way fares based on user searches. Data last updated May 7, 2026.
Search for one-way flight options from St. Louis to Phoenix. Find affordable one-way fares based on user searches. Data last updated May 7, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/4. 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.
Tue 5/266:33 pm
STL
- PHX
1 stop28h 00m
Frontier
Deal found 5/4![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 5/275:27 pm
STL
- PHX
1 stop30h 59m
Frontier
Deal found 5/7![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 5/3. 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 5/306:30 pm
STL
- PHX
1 stop6h 54m
Frontier
Deal found 5/3![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 5/5. 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.
Tue 8/48:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Deal found 5/5![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 5/4. 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.
Sun 6/79:06 pm
STL
- PHX
1 stop16h 17m
Frontier
Deal found 5/4![Frontier logo]()
$110
This CheapOair deal was found by Cheapflights users on 5/3. 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.
Sat 5/234:19 pm
STL
- PHX
1 stop20h 26m
Frontier
Deal found 5/3![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Tue 7/287:03 pm
STL
- PHX
1 stop5h 54m
Frontier
Deal found 5/6![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 7/17:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 5/3![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 6/15:27 pm
STL
- PHX
1 stop30h 59m
Frontier
Deal found 5/5![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 5/2. 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 5/243:30 pm
STL
- PHX
1 stop22h 40m
Frontier
Deal found 5/2![Frontier logo]()
$116
Find flight deals from St. Louis to Phoenix
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Phoenix (PH1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 7, 2026.
Round-trip from | $230 (Frontier) |
|---|---|
One-way from | $83 (Kiwi.com) |
Popular in | April |
Cheapest in | November |
Average price | $375 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Phoenix 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 May 7, 2026.
Use the filters below to find and compare flights from St. Louis to Phoenix that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 9/29
11:55 am-1:05 pm
Nonstop3h 10m
Phoenix Sky Harbor Intl
Sat 10/3
7:20 am-2:20 pm
1 stop5h 00m
$385
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 10/21
6:59 pm-11:42 pm
1 stop6h 43m
Phoenix Sky Harbor Intl
Tue 10/27
10:05 am-5:56 pm
1 stop5h 51m
$395
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Mon 6/1
6:00 pm-7:25 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Sat 6/6
8:05 pm-1:00 am
Nonstop2h 55m
$396
Quickest round-trip
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 5/29
6:05 am-7:30 am
Nonstop3h 25m
Phoenix Sky Harbor Intl
Mon 6/1
5:15 am-10:05 am
Nonstop2h 50m
$396
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Wed 5/27
6:35 am-10:15 am
1 stop5h 40m
Phoenix Sky Harbor Intl
Mon 6/1
5:15 am-10:05 am
Nonstop2h 50m
$406
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Tue 6/2
5:35 am-9:20 am
1 stop5h 45m
Phoenix Sky Harbor Intl
Thu 6/4
5:00 am-9:50 am
Nonstop2h 50m
$406
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Thu 5/28
2:25 pm-3:50 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Mon 6/1
5:35 am-1:10 pm
1 stop5h 35m
$406
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Mon 6/1
6:00 pm-7:25 pm
Nonstop3h 25m
Phoenix Sky Harbor Intl
Wed 6/3
4:20 pm-9:10 pm
Nonstop2h 50m
$406
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Thu 7/16
7:50 am-9:00 am
Nonstop3h 10m
Phoenix Sky Harbor Intl
Wed 7/22
4:50 pm-11:40 pm
1 stop4h 50m
$415
St. LouisPhoenix
STL - PHX
STLPHX
Lambert-St Louis
Fri 10/23
5:00 am-8:45 am
1 stop5h 45m
Phoenix Sky Harbor Intl
Wed 10/28
7:45 am-12:40 pm
Nonstop2h 55m
$415
Showing 1-10 of 21 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Phoenix
Have a flexible travel schedule? Discover the best time to fly to Phoenix from St. Louis with our price prediction graph.
STL-PH1
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 Phoenix
STL-PH1
STL-PHX
How far ahead should I book a flight from St. Louis to Phoenix?
The best time to book flights from St. Louis to Phoenix is 23 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from St. Louis to Phoenix?
Currently, December is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $40). Flying from St. Louis to Phoenix in June is currently the most expensive (average of $199). 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 PHX?
Find hourly flight availability from St. Louis to Phoenix. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 7, 2026.
When flying from St. Louis to Phoenix, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 29% versus a flight in the morning.
What is the cheapest day to fly from St. Louis to Phoenix?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Phoenix. Price data was last updated on May 2, 2026.
Travelers seeking maximum savings on their St. Louis to Phoenix flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from St. Louis to Phoenix
Explore weekly flight availability from St. Louis to Phoenix. 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 May 7, 2026.
The most flights from STL to PH1 are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from St. Louis to Phoenix?
Reviews of airlines servicing Phoenix
Get insights into the airlines that provide service to Phoenix. 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 Phoenix. Reviews last updated May 7, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from St. Louis to Phoenix to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Phoenix. 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 Phoenix
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Complete your trip
Complete your trip to Phoenix by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Phoenix by cabin class
Find flights from St. Louis to Phoenix, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Phoenix flights
Browse other St. Louis and Phoenix flight options. Last updated on May 7, 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 May 7, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from St. Louis to Phoenix
Discover the top 6 airlines that operate flights from St. Louis to Phoenix. 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 May 7, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$121 | Average$199 | 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$209 | Average$375 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$218 | Average$389 | FlexibilityNo cancel fee | On-time63% |