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Cheap Flights from St Louis to Phoenix Sky Harbor

Compare St Louis to Phoenix Sky Harbor flight deals

Find the cheapest month or even day of the year to fly to Phoenix Sky Harbor

Book the best Phoenix Sky Harbor fare with no extra fees

Flight deals from St Louis to Phoenix Sky Harbor

Looking for a cheap last-minute deal or the best return flight from St Louis to Phoenix Sky Harbor? Find the lowest prices on one-way and return tickets right here.
Phoenix.R 1,046 per passenger.Departing Wed, 25 Feb.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 25 Feb, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,046, select.
Phoenix.R 1,052 per passenger.Departing Sat, 31 Jan.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 31 Jan, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,052, select.
Phoenix.R 1,105 per passenger.Departing Sat, 4 Apr.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Sat, 4 Apr, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,105, select.
Phoenix.R 1,138 per passenger.Departing Mon, 2 Mar.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 2 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,138, select.
Phoenix.R 1,299 per passenger.Departing Sun, 1 Feb.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Sun, 1 Feb, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,299, select.
Phoenix.R 1,302 per passenger.Departing Mon, 2 Mar.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Mon, 2 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,302, select.
Phoenix.R 1,303 per passenger.Departing Fri, 30 Jan.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from St Louis on Fri, 30 Jan, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 1,303, select.
Phoenix.R 2,772 per passenger.Departing Mon, 29 Jun.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Mon, 29 Jun, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From R 2,772, select.

Find the cheapest month to fly from St Louis to Phoenix Sky Harbor

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Phoenix Sky Harbor flights are currently cheapest in February.
Jan
from R 1,052
Feb
from R 1,046
Mar
from R 1,138
Apr
from R 1,105
May
from R 3,519
Jun
from R 2,772
Jul
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Aug
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Sep
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Oct
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Nov
from R 4,007
Dec
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Direct flights from St Louis to Phoenix Sky Harbor

St Louis to Phoenix Sky Harbor: Alternative routes

Compare routes from St Louis to Phoenix below. You may find an airport to fly into that's cheaper, faster, or easier than Phoenix Sky Harbor.

St Louis to Phoenix: Flight information

The things to know before you go.
Cheapest flight foundR 1,047
Cheapest month to flyFebruary
Average flight time3 hrs, 29 mins
Most popular airlineSouthwest Airlines
Average flights per week60

Finding cheap flights from St Louis to Phoenix Sky Harbor: Frequently asked questions

The best price we found for a return flight from St Louis to Phoenix Sky Harbor is R 2,099. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
3 hours and 29 minutes is the average flight time from St Louis to Phoenix Sky Harbor.
Southwest Airlines, American Airlines and Alaska Airlines fly direct from St Louis to Phoenix Sky Harbor.
As of January 2026, there are 60 flights per week flying from St Louis to Phoenix Sky Harbor.
The cheapest month to fly from St Louis to Phoenix Sky Harbor is usually February.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Phoenix Sky Harbor Airport on Saturday, 21 February 2026.
Yes – the average flight time is 3 hours and 29 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Phoenix Sky Harbor but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Phoenix is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines offers the cheapest flight tickets to Phoenix Sky Harbor.

Travelling from Lambert-St. Louis International Airport (STL) to Phoenix Sky Harbour International Airport (PHX): what you need to know

  • The average duration of a direct flight from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport is 3 hours 20 minutes.

  • Phoenix's timezone is UTC-7, which makes Phoenix two hours behind St Louis.

  • Take your pick of 50 weekly Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport flights. The 05:00 departure with Southwest Airlines is the earliest flight you can take. Frontier Airlines operates the latest service of the day at 23:41.

  • To ensure you catch your STL to PHX flight, allow plenty of time to check in and drop off your luggage. Turning up two hours ahead of international departures and one hour before domestic flights is the standard rule.

  • Flying during a peak time such as July? Major public holidays and other high seasons can result in longer lines and delays at airport checkpoints. Play things extra safe and get there up to four hours ahead of an international flight and two hours before domestic departures.

  • With direct flights from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport available through various airlines, flying to Phoenix (and then other corners of United States) is a breeze. You can fly nonstop with:

  • American Airlines has the highest passenger demand on this route.

  • American Airlines is the most punctual carrier that offers STL to PHX flights. An impressive 82.17% of its departures on this route arrive as planned.

  • We make it simple to book a flight with a stopover. To see your options for tickets from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport, deselect 'Direct flights only.' Then, pick a flight offering a stop long enough to visit your chosen city. Some great stopovers between STL and PHX include:

    • Kansas City International Airport

    • Denver International Airport

    • Dallas Love Field Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Phoenix Sky Harbour International Airport (PHX)

  • R 1,046 is the best price for a one-way Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport flight. Return flights start at R 2,099. These fares may change based on demand and availability.

  • To pick up cheap tickets from STL to PHX, reserve your journey six months before your departure date.

  • May is the cheapest month for flights from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport. If you prefer to fly during a different time of year, the 'Whole month' tool will give you the lowest prices for each month.

  • You won't have to check back in every day to find out if fares have gone down when you set up a Price Alert. We'll send you an update the moment a special offer becomes available on cheap flights from STL to PHX.

  • Choose your preferred arrival and departure times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to find the best deals on flights from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport.

Handy information about Lambert-St. Louis International Airport (STL)

  • You'll find STL at 10701 Lambert International Blvd..

  • When it comes to the on-time performance of Lambert-St. Louis International Airport, 78.04% of flights arrive within the scheduled timeframe.

  • Lambert-St. Louis International Airport is around 26 kilometres from central St Louis. If you're driving, ride-sharing or catching a cab from the centre, it'll take 20 minutes or so to arrive, depending on the traffic.

  • Catching public transport? You can expect a journey time of around 35 minutes.

  • Booked an early flight from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport? Avoid the hassle of rushing to the airport (and catch some extra z's) by picking one of these hotels close to STL:

Arriving at Phoenix Sky Harbour International Airport (PHX)

Getting from Phoenix Sky Harbour International Airport (PHX) to central Phoenix

  • You'll find PHX at 3400 Sky Harbour Boulevard.

  • Phoenix Sky Harbour International Airport is approximately 8 kilometres from central Phoenix. The drive time takes around 10 minutes.

  • It'll take around 35 minutes if you're travelling by public transport.

When to fly to Phoenix Sky Harbour International Airport (PHX)

  • July is the busiest month for flights from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport. To avoid the crowds, travel to Phoenix in May.

  • Book your flight from Lambert-St. Louis International Airport to Phoenix Sky Harbour International Airport for July if you'd like to go to Phoenix during its warmest month. You can expect temperatures of between 26ºC (79ºF) and 44ºC (111ºF).

  • January sees average temperatures of between 4ºC (39ºF) and 20ºC (68ºF). Search for cheap tickets from STL to PHX sometime around then if you want to travel when it's cooler.

Explore more of United States

  • San Diego is just one of the many cities in United States waiting to be discovered once you've taken in the sights of Phoenix. Around 483 kilometres away to the west, check out popular attractions including San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

  • Around 418 kilometres north-west of Phoenix, Las Vegas is another essential stop in United States. Experience the best of this destination with a visit to Las Vegas Strip, Fountains of Bellagio and Fremont Street Experience.

Plan the rest of your trip from St Louis to Phoenix

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.