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Cheap Flights from St Louis (STL) to Phoenix (PHXA)

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Flight deals from St Louis to Phoenix

Looking for a cheap last-minute deal or the best round-trip flight from St Louis to Phoenix? Find the lowest prices on one-way and round-trip tickets right here.
Phoenix.$82 per passenger.Departing Fri, Jun 6.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Fri, Jun 6, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $82, select.
Phoenix.$87 per passenger.Departing Sat, Nov 15.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Nov 15, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $87, select.
Phoenix.$87 per passenger.Departing Fri, Aug 15.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Fri, Aug 15, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $87, select.
Phoenix.$92 per passenger.Departing Thu, Jul 10.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Thu, Jul 10, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $92, select.
Phoenix.$99 per passenger.Departing Tue, May 27.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Tue, May 27, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $99, select.
Phoenix.$105 per passenger.Departing Tue, Sep 23.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Sep 23, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $105, select.
Phoenix.$131 per passenger.Departing Mon, Aug 11.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Mon, Aug 11, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $131, select.
Phoenix.$132 per passenger.Departing Mon, Jul 21.One-way flight with American Airlines.Outbound direct flight with American Airlines departing from St Louis on Mon, Jul 21, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $132, select.

Find the cheapest month to fly from St Louis to Phoenix

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Phoenix flights are currently cheapest in June.
May
from $99
Jun
from $82
Jul
from $93
Aug
from $87
Sep
from $106
Oct
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Nov
from $87
Dec
from $607
Jan
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Feb
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Mar
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Apr
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Direct flights from St Louis to Phoenix

Alternative St Louis to Phoenix routes

Looking for the cheapest, fastest or easiest route from St Louis to Phoenix? You could fly into the following airports instead.

St Louis to Phoenix: Flight information

The things to know before you go.
Cheapest flight found$82
Cheapest month to flyJune
Average flight time3 hrs, 23 mins
Most popular airlineSouthwest Airlines
Average flights per week69

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

There are 4 airports in Phoenix: Phoenix Sky Harbor, Phoenix Scottsdale Municipal, Phoenix-Deer Valley, and Phoenix-Mesa Gateway.
The best price we found for a round-trip flight from St Louis to Phoenix is $164. 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 23 minutes is the average flight time from St Louis to Phoenix.
Southwest Airlines, American Airlines and Alaska Airlines fly direct from St Louis to Phoenix.
There are 138 flights per week flying from St Louis to Phoenix, as of May 2025.
The cheapest month to fly from St Louis to Phoenix is usually May 2025.
If you're flying from St Louis Airport, the cheapest airport near Phoenix is Phoenix Sky Harbor – which is 3.7 miles away from the center of Phoenix. We've found flights to this airport from $164.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Phoenix on Friday, June 13, 2025.
Yes – the average flight time is 3 hours and 23 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 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.
In May, the average temperature is usually around 77°F. July is typically the warmest month in Phoenix, when it usually averages around 103°F. You can expect the least rain in June. The coldest month is December, with temperatures averaging 39°F. The rainiest month is August.
Currently, Frontier Airlines and American Airlines offer the cheapest flight tickets to Phoenix.

Traveling from Lambert-St. Louis International Airport (STL) to Phoenix: what you need to know

  • Around 3 hours is how long you'll be traveling on a direct flight from Lambert-St. Louis International Airport to Phoenix.

  • Phoenix is two hours behind St Louis, where Lambert-St. Louis International Airport is located. Phoenix follows the UTC-7 timezone.

  • With 31 weekly flights between the two airports, Lambert-St. Louis International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) is the busiest route. Southwest Airlines operates the earliest flight at 05:15. If you're eager to get more out of your day before leaving, the last flight from STL to PHX is with Southwest Airlines at 22:40.

  • To avoid missing your STL to Phoenix flight, leave plenty of time for things like check-in and baggage drop. Turning up two hours before international departures and one hour before domestic flights is the general rule.

  • Taking off during a peak period like school or public holidays? Expect longer queues at security and check-in. To play it safe, arrive up to four hours before international flights and two hours before domestic departures.

  • Direct Lambert-St. Louis International Airport to Phoenix tickets are available for booking. Phoenix Sky Harbor International Airport (PHX) is where you'll disembark.

  • Southwest Airlines is a well-known airline that offers direct flights from Lambert-St. Louis International Airport to Phoenix.

  • Traveling from central St Louis to STL takes about 35 minutes by public transport. If you ride-share, drive or get a cab, you'll cover the 10 miles in 20 minutes or so, depending on traffic.

  • Catching an early flight from Lambert-St. Louis International Airport to Phoenix? Avoid the last-minute rush to the airport (and sneak in some extra precious sleep) by choosing one of these stays near STL:

  • Of the flights that depart from Lambert-St. Louis International Airport, 78.04% land on time at their destination.

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

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

  • The lowest price we've seen for a one-way Lambert-St. Louis International Airport to Phoenix flight is $82. The cheapest price for a return flight is $163. Remember fares can change due to demand at the time of booking.

  • Book one month before flying. Pricing trends show that this is the ideal window for finding cheap flights from STL to Phoenix.

  • The best month for landing cheap Lambert-St. Louis International Airport to Phoenix tickets is May. Use the 'Whole month' tool to compare prices, then select the dates offering the lowest fares.

  • There's no need to check back in every day to find out if fares have dropped when you set up a Price Alert. We'll let you know as soon as there's an even bigger deal on cheap flights from STL to Phoenix.

  • Snag an affordable flight from Lambert-St. Louis International Airport to Phoenix with the help of our filters. Choose your ideal duration, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

Airports in Phoenix

Phoenix Scottsdale Municipal Airport (SCF)

  • Phoenix Scottsdale Municipal Airport (SCF) is around 20 miles from the center of Phoenix. If you're getting a cab or a ride-share, the drive takes about 35 minutes.

  • If you're using public transport, expect a journey time of around 1 hour 55 minutes.

  • If you're arriving on a late flight from Lambert-St. Louis International Airport to Phoenix, nothing beats the convenience of staying near the terminal. Grab your luggage from the carousel and then be showered and sleeping not long after at one of these accommodation options near SCF:

Phoenix Sky Harbor International Airport (PHX)

  • After your flight from Lambert-St. Louis International Airport to Phoenix has touched down, you can get to the city center in around 10 minutes by car. Central Phoenix is roughly 5 miles from Phoenix Sky Harbor International Airport (PHX).

  • If you're catching public transport, it'll take around 35 minutes.

  • There are some comfortable places to rest your head close to PHX. Kick back and get cozy after your STL to Phoenix flight at any of these perfectly located options:

  • Forget about public transport schedules or long cab queues. Pick up a Phoenix Sky Harbor International Airport rental car and take your trip in whatever direction you choose. Compare availability and rates from Europcar, Dollar and Thrifty.

  • Don't pay more than you need to. Booking your ride one week ahead of your arrival at PHX will help you save.

  • You can find Phoenix Sky Harbor International Airport at 3400 Sky Harbor Boulevard.

Phoenix-Mesa Gateway Airport (AZA)

  • Set your sights on the city center after your flight from Lambert-St. Louis International Airport to Phoenix has arrived. Central Phoenix is about 35 miles from Phoenix-Mesa Gateway Airport (AZA) and takes roughly 40 minutes to reach by cab or ride-share.

  • Enjoy a low-stress, comfortable start to your break by staying at a hotel near AZA after your STL to Phoenix flight. Rest up after a long day of travel or just take a moment to find your footing in a new place at:

  • Start your trip without stressing over how to get to your destination with a Phoenix-Mesa Gateway Airport rental car. Book your ideal wheels with trusted companies here like Dollar, Alamo and Budget.

  • About two weeks ahead of your flight from Lambert-St. Louis International Airport to Phoenix is the ideal time to book your ride from AZA. You're more likely to get a better rate or even pick up some early bird discounts.

  • Phoenix-Mesa Gateway Airport is located at 6033 S. Sossaman Rd..

Best time to go to Phoenix

  • Carefully consider your dates before securing your flight from Lambert-St. Louis International Airport to Phoenix. The city buzzes in peak season, but hotel rates are often higher and major attractions can be crowded. Go to Phoenix in the off-season if you want a more relaxed vibe.

  • The warmest month in Phoenix is July, with temperatures ranging between 79ºF and 111ºF. Book your Lambert-St. Louis International Airport to Phoenix plane ticket then if that's your ideal forecast.

  • January sees average temperatures of between 39ºF and 68ºF. Look for a cheap ticket from STL to Phoenix around that time if you like cooler conditions.

More about Phoenix

  • Start your Phoenix trip off on the right foot by choosing the perfect place to stay. After booking your flight from Lambert-St. Louis International Airport to Phoenix, browse our selection of accommodation options including:

  • There are so many things to explore in this city it can be difficult to know where to start. Heard Museum, Desert Botanical Garden and Papago Park are highlights which should be on every Phoenix itinerary.

Explore more of United States

  • You've visited Phoenix, now it's time to discover other parts of United States. Travel around 300 miles west to San Diego to tick off its top attractions. From San Diego Zoo to USS Midway Museum and SeaWorld San Diego, there's plenty to keep you busy.

  • If you're ready to explore another side of United States, head for Las Vegas, roughly 260 miles north-west of Phoenix. Las Vegas Strip, Fountains of Bellagio and Fremont Street Experience are key highlights.

More travel options

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.