Fly from STL to PHX: Best Rates and Travel Guide for St. Louis to Phoenix Flights
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$139.58
Last updated Feb 16, 2026
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Tracking the May 7, 2026 departure — the cheapest date we found.
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Phoenix (PHX)
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Search FlightsTraveling from the historic Gateway City of St. Louis to the sun-drenched Valley of the Sun in Phoenix offers a seamless transition from the lush landscapes of the Midwest to the ruggedly beautiful Sonoran Desert. This popular air corridor serves both business travelers heading to Arizona's tech hubs and vacationers seeking world-class golf courses, rejuvenating desert spas, and the breathtaking views of Camelback Mountain. Whether you are looking for a direct flight to escape the humidity or planning a strategic layover to explore the Southwest, this route provides numerous daily options to suit your schedule and budget preferences.
Travel Tips
Book your tickets early, specifically focusing on Southwest Airlines' "Wanna Get Away" fares which often appear three weeks before departure for the STL to PHX route. Secondly, since Phoenix Sky Harbor is a massive facility, download the airport map and check your arrival gate to plan your ground transportation in advance. Third, remember that the transition from Missouri's humidity to Arizona's dry heat requires extra hydration; carry a large reusable water bottle to fill up after passing through security. Finally, if you are flying out of St. Louis, be aware that Terminal 2 is dedicated to Southwest while other carriers use Terminal 1, so verify your departure point to avoid delays.
Airport Information
St. Louis (STL)
St. Louis Lambert International Airport (STL) serves as the primary aviation gateway for the Missouri-Illinois metropolitan region. Located approximately 14 miles northwest of downtown St. Louis, it features two main terminals and serves as a major focus city for Southwest Airlines. The airport is famous for its historic Minoru Yamasaki-designed Terminal 1, which served as a precursor to the World Trade Center's design. Travelers can enjoy local culinary favorites like toasted ravioli at various concourse restaurants while waiting for their departure.
Phoenix (PHX)
Phoenix Sky Harbor International Airport (PHX) is the largest and busiest airport in Arizona, situated just three miles east of downtown Phoenix. Known as "America's Friendliest Airport," it serves as a major hub for American Airlines and a significant base for Southwest Airlines. The airport offers unique amenities like the PHX Sky Train, which provides free transportation between terminals and the valley's light rail system. Passengers arriving here will find easy access to Scottsdale, Tempe, and the surrounding desert resorts via a well-organized ground transportation network.
Seasonal Pricing Patterns
Flights from St. Louis to Phoenix typically peak in price during the late winter and early spring months, specifically from February to April, as travelers and spring breakers flock to Arizona for its ideal temperatures and Major League Baseball Spring Training. Conversely, you can find the most significant bargains during the scorching summer months of July and August. While the Phoenix heat is intense during this period, airfares and hotel rates drop dramatically, making it the best time for budget-conscious travelers who prefer indoor activities or resort lounging.
Frequently Asked Questions
How long is the flight from STL to PHX?
Direct flights from St. Louis to Phoenix usually take about 3 hours and 30 minutes, covering a distance of approximately 1,260 miles.
Which airlines offer non-stop flights on this route?
Southwest Airlines and American Airlines are the primary carriers offering consistent non-stop service between St. Louis and Phoenix Sky Harbor.
Is there a time difference between St. Louis and Phoenix?
Yes, St. Louis follows Central Time, while Phoenix is on Mountain Standard Time. Because Arizona does not observe Daylight Saving Time, the difference is either one or two hours depending on the time of year.
What is the best way to get from PHX airport to downtown Phoenix?
The most efficient method is using the free PHX Sky Train to reach the 44th St/Washington Valley Metro Rail station, which takes you directly into the heart of the city.