$98+ Cheap flights from Sky Harbor Intl (PHX) to St. Louis (STL)
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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Jun 14 — Jun 211
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Sky Harbor Intl to St. Louis 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 Phoenix Sky Harbor Intl to Lambert-St Louis are usually found in October or January, booked 25 days in advance, depart on a Friday or Saturday and return on a Wednesday
Cheap flight deals from Sky Harbor Intl to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Sky Harbor Intl to St. LouisExplore the most affordable flight options available from Sky Harbor Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2026.
Explore the most affordable flight options available from Sky Harbor Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2026.
This Super.com deal was found by Cheapflights users on 5/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:40 am
PHX
- STL
1 stop8h 26m
Frontier
Wed 6/177:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 5/10![Frontier logo]()
$183
This Super.com deal was found by Cheapflights users on 5/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/67:40 am
PHX
- STL
1 stop7h 54m
Frontier
Wed 6/107:04 pm
STL
- PHX
1 stop6h 00m
Frontier
Deal found 5/10![Frontier logo]()
$190
This Super.com deal was found by Cheapflights users on 5/13. 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 7/711:19 am
PHX
- STL
1 stop6h 04m
Frontier
Tue 7/147:03 pm
STL
- PHX
1 stop5h 54m
Frontier
Deal found 5/13![Frontier logo]()
$194
This Super.com deal was found by Cheapflights users on 5/12. 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 7/710:27 pm
PHX
- STL
1 stop17h 38m
Frontier
Sat 7/114:52 pm
STL
- PHX
1 stop7h 26m
Frontier
Deal found 5/12![Frontier logo]()
$197
This Super.com deal was found by Cheapflights users on 5/12. 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 7/116:24 am
PHX
- STL
1 stop6h 25m
Frontier
Sat 7/114:52 pm
STL
- PHX
1 stop7h 26m
Frontier
Deal found 5/12![Frontier logo]()
$198
This Super.com deal was found by Cheapflights users on 5/11. 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 6/1610:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Sat 6/207:19 pm
STL
- PHX
1 stop5h 45m
Frontier
Deal found 5/11![Frontier logo]()
$199
This Super.com deal was found by Cheapflights users on 5/13. 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 6/1610:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Tue 6/238:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 5/13![Frontier logo]()
$200
This Super.com deal was found by Cheapflights users on 5/12. 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 7/186:24 am
PHX
- STL
1 stop6h 25m
Frontier
Sat 8/14:52 pm
STL
- PHX
1 stop7h 26m
Frontier
Deal found 5/12![Frontier logo]()
$202
This Super.com deal was found by Cheapflights users on 5/13. 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 6/206:24 am
PHX
- STL
1 stop10h 10m
Frontier
Tue 6/238:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 5/13![Frontier logo]()
$205
This Super.com deal was found by Cheapflights users on 5/12. 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 6/3010:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Tue 7/78:08 pm
STL
- PHX
1 stop19h 09m
Frontier
Deal found 5/12![Frontier logo]()
$206
This Super.com deal was found by Cheapflights users on 5/14. 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.
Wed 8/52:00 pm
PHX
- STL
1 stop22h 07m
Frontier
Sat 8/88:08 pm
STL
- PHX
1 stop5h 24m
Frontier
Deal found 5/14![Frontier logo]()
$207
Best flights from Sky Harbor Intl to St. LouisDiscover carefully curated flight deals from Sky Harbor Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 15, 2026.
Discover carefully curated flight deals from Sky Harbor Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 15, 2026.
This Southwest deal was found by Cheapflights users on 5/14. 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 6/3010:50 am
PHX
- STL
1 stop4h 55m
Southwest
Tue 7/79:40 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/14![Southwest logo]()
$381
This Southwest deal was found by Cheapflights users on 5/13. 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 6/165:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Tue 6/232:20 pm
STL
- PHX
1 stop5h 50m
Southwest
Deal found 5/13![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 5/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/312:20 pm
PHX
- STL
1 stop6h 00m
Southwest
Wed 6/179:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/10![Southwest logo]()
$391
This Southwest deal was found by Cheapflights users on 5/14. 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 7/248:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Tue 7/286:10 am
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/14![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 5/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:20 am
PHX
- STL
Nonstop2h 55m
Southwest
Sun 8/165:10 pm
STL
- PHX
Nonstop3h 15m
Southwest
Deal found 5/10![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 5/13. 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 7/38:55 pm
PHX
- STL
Nonstop2h 55m
Southwest
Fri 7/107:20 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/13![Southwest logo]()
$405
This Southwest deal was found by Cheapflights users on 5/11. 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 6/34:20 pm
PHX
- STL
Nonstop2h 50m
Southwest
Mon 6/89:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/11![Southwest logo]()
$406
This Southwest deal was found by Cheapflights users on 5/14. 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 8/59:00 am
PHX
- STL
1 stop6h 40m
Southwest
Sun 8/99:15 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/14![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 5/13. 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 5/276:20 pm
PHX
- STL
Nonstop2h 55m
Southwest
Sat 5/301:15 pm
STL
- PHX
Nonstop3h 25m
Southwest
Deal found 5/13![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 5/11. 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 6/212:20 pm
PHX
- STL
1 stop6h 00m
Southwest
Thu 6/119:45 pm
STL
- PHX
Nonstop3h 10m
Southwest
Deal found 5/11![Southwest logo]()
$421
This Southwest deal was found by Cheapflights users on 5/13. 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 6/105:00 am
PHX
- STL
Nonstop2h 50m
Southwest
Sun 6/146:00 am
STL
- PHX
1 stop5h 00m
Southwest
Deal found 5/13![Southwest logo]()
$425
Last-minute flights from Sky Harbor Intl to St. LouisDiscover last-minute flight deals from Sky Harbor Intl to St. Louis. Data last updated May 15, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to St. Louis. Data last updated May 15, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 5/11. 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 5/277:40 am
PHX
- STL
1 stop8h 26m
Frontier
Wed 6/107:04 pm
STL
- PHX
1 stop6h 00m
Frontier
Deal found 5/11![Frontier logo]()
$220
This Frontier deal was found by Cheapflights users on 5/11. 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.
Mon 6/17:40 am
PHX
- STL
1 stop10h 31m
Frontier
Tue 6/26:51 pm
STL
- PHX
1 stop6h 33m
Frontier
Deal found 5/11![Frontier logo]()
$224
This Super.com deal was found by Cheapflights users on 5/11. 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 6/27:40 am
PHX
- STL
1 stop8h 26m
Frontier
Thu 6/117:38 pm
STL
- PHX
1 stop5h 51m
Frontier
Deal found 5/11![Frontier logo]()
$216
This Super.com deal was found by Cheapflights users on 5/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:40 am
PHX
- STL
1 stop8h 26m
Frontier
Wed 6/177:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 5/10![Frontier logo]()
$183
This Super.com deal was found by Cheapflights users on 5/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/67:40 am
PHX
- STL
1 stop7h 54m
Frontier
Wed 6/107:04 pm
STL
- PHX
1 stop6h 00m
Frontier
Deal found 5/10![Frontier logo]()
$190
This Super.com deal was found by Cheapflights users on 5/12. 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.
Wed 6/1010:32 pm
PHX
- STL
1 stop13h 34m
Frontier
Thu 6/117:03 pm
STL
- PHX
1 stop6h 01m
Frontier
Deal found 5/12![Frontier logo]()
$222
This Super.com deal was found by Cheapflights users on 5/11. 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 6/1610:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Sat 6/207:19 pm
STL
- PHX
1 stop5h 45m
Frontier
Deal found 5/11![Frontier logo]()
$199
This Super.com deal was found by Cheapflights users on 5/13. 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 6/1610:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Tue 6/238:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 5/13![Frontier logo]()
$200
This Super.com deal was found by Cheapflights users on 5/13. 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 6/206:24 am
PHX
- STL
1 stop10h 10m
Frontier
Tue 6/238:08 pm
STL
- PHX
1 stop5h 21m
Frontier
Deal found 5/13![Frontier logo]()
$205
This Super.com deal was found by Cheapflights users on 5/11. 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 6/258:40 am
PHX
- STL
1 stop8h 13m
Frontier
Sat 7/114:52 pm
STL
- PHX
1 stop7h 26m
Frontier
Deal found 5/11![Frontier logo]()
$223
This Super.com deal was found by Cheapflights users on 5/12. 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 6/3010:32 pm
PHX
- STL
1 stop18h 19m
Frontier
Tue 7/78:08 pm
STL
- PHX
1 stop19h 09m
Frontier
Deal found 5/12![Frontier logo]()
$206
One-way flights from Sky Harbor Intl to St. LouisSearch for one-way flight options from Sky Harbor Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated May 15, 2026.
Search for one-way flight options from Sky Harbor Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated May 15, 2026.
This Super.com deal was found by Cheapflights users on 5/12. 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.
Wed 6/104:53 pm
PHX
- STL
1 stop24h 00m
Frontier
Deal found 5/12![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 5/11. 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 6/67:40 am
PHX
- STL
1 stop7h 54m
Frontier
Deal found 5/11![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 5/12. 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 8/411:19 am
PHX
- STL
1 stop6h 04m
Frontier
Deal found 5/12![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 5/11. 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 6/302:00 pm
PHX
- STL
1 stop26h 51m
Frontier
Deal found 5/11![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 5/12. 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 8/1111:32 am
PHX
- STL
2 stops29h 51m
Frontier
Deal found 5/12![Frontier logo]()
$107
This Super.com deal was found by Cheapflights users on 5/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/242:15 pm
PHX
- STL
1 stop26h 38m
Frontier
Deal found 5/10![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 5/11. 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.
Wed 5/277:40 am
PHX
- STL
1 stop8h 26m
Frontier
Deal found 5/11![Frontier logo]()
$110
This Booking.com deal was found by Cheapflights users on 5/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/166:53 pm
PHX
- STL
1 stop22h 30m
Frontier
Deal found 5/12![Frontier logo]()
$111
This Trip.com deal was found by Cheapflights users on 5/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/136:40 am
PHX
- STL
1 stop10h 13m
Frontier
Deal found 5/13![Frontier logo]()
$114
Find flight deals from Sky Harbor Intl to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Sky Harbor Intl (PHX) to St. Louis (STL). 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 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $190 (Super.com) |
One-way from | $98 (Super.com) |
Popular in | March |
Cheapest in | October |
Average price | $385 |
Good round-trip deal | $390 or less |
Good one-way deal | $207 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Sky Harbor Intl to St. Louis 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 15, 2026.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/30
10:50 am-5:45 pm
1 stop4h 55m
Lambert-St Louis
Tue 7/7
9:40 am-10:50 am
Nonstop3h 10m
$381
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/16
5:00 am-9:50 am
Nonstop2h 50m
Lambert-St Louis
Tue 6/23
2:20 pm-6:10 pm
1 stop5h 50m
$385
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 6/3
12:20 pm-8:20 pm
1 stop6h 00m
Lambert-St Louis
Wed 6/17
9:15 pm-10:25 pm
Nonstop3h 10m
$391
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 7/24
8:55 pm-1:50 am
Nonstop2h 55m
Lambert-St Louis
Tue 7/28
6:10 am-7:20 am
Nonstop3h 10m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 8/4
8:20 am-1:15 pm
Nonstop2h 55m
Lambert-St Louis
Sun 8/16
5:10 pm-6:25 pm
Nonstop3h 15m
$405
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 7/3
8:55 pm-1:50 am
Nonstop2h 55m
Lambert-St Louis
Fri 7/10
7:20 pm-8:30 pm
Nonstop3h 10m
$405
Quickest round-trip
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 6/3
4:20 pm-9:10 pm
Nonstop2h 50m
Lambert-St Louis
Mon 6/8
9:45 pm-10:55 pm
Nonstop3h 10m
$406
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 8/5
9:00 am-5:40 pm
1 stop6h 40m
Lambert-St Louis
Sun 8/9
9:15 pm-10:25 pm
Nonstop3h 10m
$415
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 5/27
6:20 pm-11:15 pm
Nonstop2h 55m
Lambert-St Louis
Sat 5/30
1:15 pm-2:40 pm
Nonstop3h 25m
$415
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 6/2
12:20 pm-8:20 pm
1 stop6h 00m
Lambert-St Louis
Thu 6/11
9:45 pm-10:55 pm
Nonstop3h 10m
$421
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Sky Harbor Intl to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Sky Harbor Intl to St. Louis in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Phoenix Sky Harbor Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Phoenix Sky Harbor Intl Airport-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Phoenix Sky Harbor Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Sky Harbor Intl to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Sky Harbor Intl with our price prediction graph.
PHX-STL
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 Phoenix Sky Harbor Intl Airport to St. Louis
Prices
Airlines
More
How far ahead should I book a flight from Phoenix Sky Harbor Intl Airport to St. Louis?
To ensure you get the cheapest price possible for a flight from Phoenix Sky Harbor Intl Airport to St. Louis, 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 Phoenix Sky Harbor Intl Airport to St. Louis?
Currently, October is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $297). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in March is currently the most expensive (average of $440). 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 PHX to STL?
Find hourly flight availability from Sky Harbor Intl to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 15, 2026.
A simple way to save on the total cost of your ticket is to fly from Phoenix Sky Harbor Intl Airport to St. Louis at noon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight in the evening.
What is the cheapest day to fly from Phoenix Sky Harbor Intl Airport to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to St. Louis. Price data was last updated on May 9, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Louis flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
What’s the top layover airport for flights from Phoenix Sky Harbor Intl Airport to St. Louis?
Share of 1-stop round-trip flights from Phoenix Sky Harbor Intl Airport to St. Louis chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 67% of 1-stop itineraries from Phoenix Sky Harbor Intl Airport to St. Louis on Cheapflights.
What’s the cheapest layover airport for flights from Phoenix Sky Harbor Intl Airport to St. Louis?
Average round-trip fare for 1-stop flights from Phoenix Sky Harbor Intl Airport to St. Louis, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $174.
What’s the fastest layover option from Phoenix Sky Harbor Intl Airport to St. Louis?
Shortest average travel time for 1-stop one-way flights from Phoenix Sky Harbor Intl Airport to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 7h 10m.
Which airport typically offers the quickest layover for flights from Phoenix Sky Harbor Intl Airport to St. Louis?
Average layover duration for 1-stop one-way flights from Phoenix Sky Harbor Intl Airport to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 6h 03m.
The best insider tips for Phoenix Sky Harbor Intl Airport to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Phoenix Sky Harbor Intl Airport to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated May 15, 2026.
See what other customers who have flown with Southwest,Delta, andAmerican Airlines from Phoenix Sky Harbor Intl Airport to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from Sky Harbor Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Sky Harbor Intl
Popular flights
St. Louis flight routes
Alternative routes for Sky Harbor Intl to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Sky Harbor Intl to St. Louis by cabin class
Find flights from Sky Harbor Intl to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Sky Harbor Intl and St. Louis flights
Browse other Sky Harbor Intl and St. Louis flight options. Last updated on May 15, 2026.
Other flights from Sky Harbor Intl
Browse through other flights departing from Sky Harbor Intl. Flights are based on user searches made on Cheapflights and were last updated on May 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 15, 2026.
Top 4 airlines flying from Sky Harbor Intl to St. Louis
Discover the top 4 airlines that operate flights from Sky Harbor Intl to St. Louis. 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 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$99 | Average$206 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$228 | Average$382 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$257 | Average$397 | FlexibilityNo cancel fee | On-time63% |