
Popular airlines from St. Louis Lambert Intl. Airport (STL) to Phoenix Sky Harbor Intl. Airport (PHX)
- Alaska Airlines
Alaska Airlines
- Southwest Airlines
Southwest Airlines
- American Airlines
American Airlines
- United
United
- Delta
Delta
- Frontier Airlines
Frontier Airlines
- Hawaiian Airlines
Hawaiian Airlines
Today's featured flight deals from St. Louis Lambert Intl. Airport (STL) to Phoenix Sky Harbor Intl. Airport (PHX)
- St. Louis (STL) to Phoenix (PHX).Southwest Airlines, nonstop.Departing on Wed, Nov 26 at 10:45pm from St. Louis, arriving on Thu, Nov 27 at 1:10am in Phoenix.Returning on Sun, Nov 30 at 9:25pm from Phoenix, arriving on Mon, Dec 1 at 7:00am in St. Louis.Select Southwest Airlines flight departing on Wed, Nov 26 at 10:45pm from St. Louis, returning on Sun, Nov 30 at 9:25pm from Phoenix priced at $33835% less than typical$338
- St. Louis (STL) to Phoenix (PHX).Southwest Airlines, nonstop.Departing on Wed, Nov 26 at 10:45pm from St. Louis, arriving on Thu, Nov 27 at 1:10am in Phoenix.Returning on Sun, Nov 30 at 9:45pm from Phoenix, arriving on Mon, Dec 1 at 7:05am in St. Louis.Select Southwest Airlines flight departing on Wed, Nov 26 at 10:45pm from St. Louis, returning on Sun, Nov 30 at 9:45pm from Phoenix priced at $33835% less than typical$338
- St. Louis (STL) to Phoenix (PHX).Southwest Airlines, nonstop.Departing on Sun, Nov 23 at 5:20am from St. Louis, arriving at 7:45am in Phoenix.Returning on Thu, Nov 27 at 2:40pm from Phoenix, arriving at 6:30pm in St. Louis.Select Southwest Airlines flight departing on Sun, Nov 23 at 5:20am from St. Louis, returning on Thu, Nov 27 at 2:40pm from Phoenix priced at $22045% less than typical$220
- St. Louis (STL) to Phoenix (PHX).American Airlines, nonstop.Departing on Wed, Nov 12 at 7:00am from St. Louis, arriving at 9:36am in Phoenix.Returning on Sat, Nov 15 at 9:36am from Phoenix, arriving at 1:40pm in St. Louis.Select American Airlines flight departing on Wed, Nov 12 at 7:00am from St. Louis, returning on Sat, Nov 15 at 9:36am from Phoenix priced at $14755% less than typical$147
- St. Louis (STL) to Phoenix (PHX).Southwest Airlines, nonstop.Departing on Fri, Nov 21 at 5:20am from St. Louis, arriving at 7:45am in Phoenix.Returning on Sun, Nov 30 at 10:45pm from Phoenix, arriving on Mon, Dec 1 at 10:20am in St. Louis.Select Southwest Airlines flight departing on Fri, Nov 21 at 5:20am from St. Louis, returning on Sun, Nov 30 at 10:45pm from Phoenix priced at $33830% less than typical$338
- St. Louis (STL) to Phoenix (PHX).American Airlines, nonstop.Departing on Tue, Nov 18 at 2:29pm from St. Louis, arriving at 5:05pm in Phoenix.Returning on Sat, Nov 22 at 6:20am from Phoenix, arriving at 10:10am in St. Louis.Select American Airlines flight departing on Tue, Nov 18 at 2:29pm from St. Louis, returning on Sat, Nov 22 at 6:20am from Phoenix priced at $14750% less than typical$147
- St. Louis (STL) to Phoenix (PHX).Southwest Airlines, nonstop.Departing on Fri, Nov 21 at 5:20am from St. Louis, arriving at 7:45am in Phoenix.Returning on Tue, Nov 25 at 2:25pm from Phoenix, arriving at 6:15pm in St. Louis.Select Southwest Airlines flight departing on Fri, Nov 21 at 5:20am from St. Louis, returning on Tue, Nov 25 at 2:25pm from Phoenix priced at $14750% less than typical$147
- St. Louis (STL) to Phoenix (PHX).American Airlines, nonstop.Departing on Tue, Nov 4 at 2:29pm from St. Louis, arriving at 5:05pm in Phoenix.Returning on Tue, Nov 11 at 7:55pm from Phoenix, arriving at 11:51pm in St. Louis.Select American Airlines flight departing on Tue, Nov 4 at 2:29pm from St. Louis, returning on Tue, Nov 11 at 7:55pm from Phoenix priced at $17045% less than typical$170
- St. Louis (STL) to Phoenix (PHX).American Airlines, nonstop.Departing on Wed, Nov 5 at 7:00am from St. Louis, arriving at 9:36am in Phoenix.Returning on Wed, Nov 12 at 7:55pm from Phoenix, arriving at 11:51pm in St. Louis.Select American Airlines flight departing on Wed, Nov 5 at 7:00am from St. Louis, returning on Wed, Nov 12 at 7:55pm from Phoenix priced at $23030% less than typical$230
Cheap Flights from St. Louis to Phoenix (STL-PHX)
Prices were available within the past 7 days and start at $34 for one-way flights and $54 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.










Find the cheapest month to fly from St. Louis (STL) to Phoenix (PHX)
January is typically the cheapest month to fly
Alternative airports near Phoenix
Prices were available within the past 7 days. Prices and availability are subject to change.
Frequently asked questions
Travel information
Origin airport | Lambert-St. Louis Intl. |
---|---|
Destination airport | Sky Harbor Intl. |
Airlines serving | Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United |
Roundtrip price | $54 |
Distance | 1259 mi |
Average flight time | 1 hour 20 mins |
Book with confidence
St. Louis to Phoenix Flights
The cheapest times to fly from St. Louis to Phoenix
On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Phoenix are during the month of January. You can find some of the cheapest flights from St. Louis to Phoenix with Expedia's search tool and vast selection of airlines.
The best time to book a flight from St. Louis to Phoenix
Sunday is one of the best days to book for cheap flights from St. Louis to Phoenix: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.
How to find cheap round-trip tickets from St. Louis to Phoenix
Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Phoenix in 2025. You can also book with separate airlines for your outbound and return journeys, from $34 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.
Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Phoenix flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.
You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Phoenix airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.
*Terms apply.
Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.
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