Flights from St. Louis to Phoenix Sky Harbor

Our cheapest offers for flights from St. Louis to Phoenix Sky Harbor

Here you can compare cheap flights from St. Louis (STL) to Phoenix Sky Harbor (PHX) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Phoenix Sky Harbor. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
St. Louis
Phoenix - Sky Harbor
Outbound
10/18/25
1 Stopover (LAS)
F92017, F93484
08h 16min
Return
11/17/25
1 Stopover (LAS)
F93483, F92018
09h 00min
Frontier Airlines ?
$198
Best option
St. Louis
Phoenix - Sky Harbor
Outbound
07/25/25
direct
AA2574
03h 15min
Return
08/17/25
direct
AA0890
02h 58min
American Airlines ?
$389
St. Louis
Phoenix - Sky Harbor
Outbound
10/18/25
1 Stopover (LAS)
F92017, F93484
08h 16min
Return
11/17/25
1 Stopover (LAS)
F93983, F92018
13h 12min
Frontier Airlines
$214
St. Louis
Phoenix - Sky Harbor
Outbound
10/18/25
1 Stopover (LAS)
F92017, F93484
08h 16min
Return
11/17/25
1 Stopover (LAS)
F93983, F92018
13h 12min
Frontier Airlines
$225
St. Louis
Phoenix - Sky Harbor
Outbound
09/04/25
direct
AA0590
03h 12min
Return
09/28/25
1 Stopover (ORD)
AA1148, AA6428
10h 23min
American Airlines ?
$255
St. Louis
Phoenix - Sky Harbor
Outbound
09/04/25
1 Stopover (DTW)
NK3897, NK3910
07h 27min
Return
09/28/25
1 Stopover (DEN)
F91820, F93302
12h 42min
Spirit Airlines
$284
St. Louis
Phoenix - Sky Harbor
Outbound
09/04/25
1 Stopover (DTW)
NK3897, NK3910
07h 27min
Return
09/28/25
1 Stopover (DEN)
F91820, F93302
12h 42min
Spirit Airlines
$297
St. Louis
Phoenix - Sky Harbor
Outbound
09/04/25
1 Stopover (DEN)
UA2625, UA2249
05h 23min
Return
09/28/25
1 Stopover (SFO)
UA2051, UA0336
07h 32min
United Airlines ?
$303
St. Louis
Phoenix - Sky Harbor
Outbound
09/04/25
1 Stopover (DTW)
NK3897, NK3910
07h 27min
Return
09/28/25
1 Stopover (LAS)
F93983, F93108
05h 34min
Spirit Airlines ?
$303
St. Louis
Phoenix - Sky Harbor
Outbound
09/04/25
direct
UA0483
05h 37min
Return
09/28/25
1 Stopover (SFO)
UA2051, UA0336
07h 32min
United Airlines ?
$315
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from St. Louis to Phoenix Sky Harbor

Favorite airline: Spirit Airlines
Spirit Airlines is the most popular airline for flights from St. Louis to Phoenix - Sky Harbor.
Spirit Airlines
30 %
Frontier Airlines
22 %
American Airlines
14 %
Direct flights are more expensive
Direct flights on this route are $328.00 more expensive on average than flights with a stopover.
non stop flight
1 stop
2 stops
03h 25min
06h 03min
27h 20min
$483
$155
$430
Favourite connection: via Las Vegas
71 % of booked tickets on this route are for flights with a transfer in Las Vegas.
Route
bookings
1 stopover Las Vegas - McCarran International Airport, NV
06h 03min, from $155
71 %
Direct flights
03h 25min, from $483
17 %
1 stopover Hartsfield-Jackson Atlanta International Airport, GA
06h 55min, from $500
8 %

Important flight information

Flight information: St. Louis - Phoenix - Sky Harbor

Roundtrip from $197.65
Flight duration min. 03:27 / max. 08:20
Return flight duration min. 02:45/ max. 09:15
Distance 2029 km
Flights per week 91
Departure airport Airport St. Louis - Lambert International Airport (STL)
Arrival airport Airport Phoenix - Sky Harbor International Airport (PHX)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Phoenix - Sky Harbor
Flight destinations with a similar price
Flight destinations with a similar price