Earn point on your loyalty program!arrow arc left

Cheap flights from St Louis (STL) to Phoenix (PHX)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)

How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from St Louis to Phoenix in July , August 2026

25 Jul - 15 Aug $ 465.00
STL
St Louis
Frontier Airlines
1 STOPS
PHX
Phoenix
PHX
Phoenix
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates
31 Jul - 08 Aug $ 720.00
STL
St Louis
Frontier Airlines
1 STOPS
PHX
Phoenix
PHX
Phoenix
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates
29 Jul - 04 Aug $ 824.00
STL
St Louis
Frontier Airlines
1 STOPS
PHX
Phoenix
PHX
Phoenix
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates

Last minute flights from St Louis to Phoenix

28 Jul - 01 Aug $ 556.00
STL
St Louis
Frontier Airlines
1 STOPS
PHX
Phoenix
PHX
Phoenix
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates
30 Jul - 31 Jul $ 665.00
STL
St Louis
United Airlines
1 STOPS
PHX
Phoenix
PHX
Phoenix
United Airlines
1 STOPS
STL
St Louis
Pick dates
27 Jul - 31 Jul $ 666.00
STL
St Louis
United Airlines
1 STOPS
PHX
Phoenix
PHX
Phoenix
United Airlines
1 STOPS
STL
St Louis
Pick dates

One-way flights to Phoenix from St Louis

9:06 AM - 11:25 AM
United Airlines
1 Stops
5h 19m
STL - PHX
$ 297
Kiwi
Pick dates
4:48 PM - 7:32 PM
United Airlines
1 Stops
5h 44m
STL - PHX
$ 297
Kiwi
Pick dates
9:06 AM - 11:25 AM
United Airlines
1 Stops
5h 19m
STL - PHX
$ 298
Kiwi
Pick dates

How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Phoenix (PHX)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.