£137 Cheap Flights from St. Louis (STL) to Phoenix (PHX)

View £137 flight on Tue, 16 Sep 2025Opens in a new window

Popular airlines from Lambert-St. Louis International Airport (STL) to Sky Harbor International Airport (PHX)

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Cheap Flights from St. Louis (STL) to Phoenix (PHX)

Prices were available within the past 7 days and start at £137 for one-way flights and £296 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, 22 Sep - Tue, 23 Sep
STL
St. Louis
PHX
Phoenix
£296 Return, found 1 day ago
£296
Return
found 1 day ago
Select Alaska Airlines flight, departing Mon, 22 Sep from St. Louis to Phoenix, returning Tue, 23 Sep, priced at £296 found 1 day ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£337 Return, found 6 days ago
£337
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £337 found 6 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£351 Return, found 6 days ago
£351
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £351 found 6 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£360 Return, found 6 days ago
£360
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £360 found 6 days ago
Alaska Airlines
Wed, 16 Jul - Wed, 23 Jul
STL
St. Louis
PHX
Phoenix
£364 Return, found 5 days ago
£364
Return
found 5 days ago
Select Alaska Airlines flight, departing Wed, 16 Jul from St. Louis to Phoenix, returning Wed, 23 Jul, priced at £364 found 5 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£375 Return, found 6 days ago
£375
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £375 found 6 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£381 Return, found 6 days ago
£381
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £381 found 6 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£395 Return, found 6 days ago
£395
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £395 found 6 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£400 Return, found 6 days ago
£400
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £400 found 6 days ago
Alaska Airlines
Thu, 9 Oct - Mon, 13 Oct
STL
St. Louis
PHX
Phoenix
£415 Return, found 6 days ago
£415
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 9 Oct from St. Louis to Phoenix, returning Mon, 13 Oct, priced at £415 found 6 days ago

Find the cheapest month to fly from St. Louis (STL) to Phoenix (PHX)

August is typically the cheapest month to fly

From £58 - £166 per traveller.

Graph displaying average flight prices per month

Flight from St. Louis to Phoenix route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Sky Harbor Intl.
Airlines serving
Alaska Airlines
Return price
£296
Distance
2014 km
Average flight time
2 hours 18 mins

Frequently asked questions

How much is a flight from STL to Phoenix Sky Harbour Airport?
The lowest price advertised for a round-trip flight between St. Louis Lambert International Airport and Sky Harbour Intl. Airport (PHX) is £296. But you better get a move on. This price is based on fares quoted within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Lambert-St. Louis Intl. Airport (STL) to Phoenix Sky Harbour Intl. Airport?
This differs from airline to airline, as each has its own terms and conditions. Head to the Customer Service Portal, where there are easy-to-follow instructions on how to cancel online.
How do I find cheap flights from Lambert-St. Louis Intl. Airport (STL) to Sky Harbour Intl. Airport (PHX) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Lambert-St. Louis Intl. Airport (STL) to Phoenix Sky Harbour Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Lambert Field to PHX?
The flying distance between St. Louis Lambert International Airport (STL) and Phoenix Sky Harbour Intl. Airport (PHX) is 2,000 kilometres. Work your way through your travel song playlist or get stuck into a book and the trip will zip on by.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Sky Harbour Intl. Airport (PHX)?
Southwest Airlines (WN) is a top option. It offers 95 flights from Lambert Field to Phoenix Sky Harbour Intl. Airport each month. Like more options? Check out what's available with American Airlines (AA). This carrier offers 56 flights every month between these airports.
Are Lambert-St. Louis Intl. Airport (STL) to Sky Harbour Intl. Airport (PHX) flight tickets cheaper when they're purchased at the last minute?
Booking last minute from St. Louis Lambert International Airport to Sky Harbour Intl. Airport (PHX) can be hit-or-miss. You may be able to find a bargain, but you could also miss out entirely! If you'd rather play it safe and start planning your trip early on, Expedia compares flight deals up to 12 months in advance. Just keep in mind that not all airlines list their prices that far in advance. Our suggestion? Check back often as prices are updated frequently.

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