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Cheap Flights from St. Louis to Phoenix

Browse current best options from St. Louis. Become a member to unlock all deals and get alerts when new deals appear.

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St. Louis

RatePunk searches hundreds of travel sites at once for deals on flights to Phoenix

Prices updated 24 days ago

486,190 searches this week

171 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated May 29, 2026.)

Today’s best flight deals from St. Louis to Phoenix

Explore current cheapest deals departing from St. Louis to Phoenix

Round trip

Sort by: Cheapest

July 20 - July 29

Cheapest

Best

Earliest

STL - Phoenix

$273

$156

Round trip

August 11 - August 19

STL - Phoenix

$343

$158

Round trip

July 27 - August 11

STL - Phoenix

$253

$160

Round trip

July 21 - August 11

STL - Phoenix

$256

$160

Round trip

July 27 - July 29

Best

STL - Phoenix

$288

$160

Round trip

July 27 - August 5

STL - Phoenix

$271

$160

Round trip

July 27 - August 12

STL - Phoenix

$256

$160

Round trip

July 21 - August 12

STL - Phoenix

$256

$160

Round trip

July 21 - July 29

Best

STL - Phoenix

$275

$160

Round trip

July 21 - August 5

STL - Phoenix

$254

$160

Round trip

Unlock all 500+ flight deals to Phoenix and get alerts when great deals appear

Route Intelligence — 486,190 Searches this Week

Insights for flights from St. Louis to Phoenix

Right now, only 5% of recent fares from St. Louis to Phoenix are classified as a good price. Fares for this route typically range from $318–$759, with a median of $409. Current fares are significantly above the typical level, suggesting that cheaper options may become available. New deals appear almost daily, so setting up a price alert could be beneficial for finding cheap flights from St. Louis to Phoenix.

A typical journey from St. Louis to Phoenix takes about 12h 18m, including connections. This is a medium-haul route, covering a distance of 2027 km. Most itineraries connect at least once, with the median number of stopovers for connecting flights being 2.

If you are looking for the cheapest time to fly from St. Louis to Phoenix, consider traveling in April, when the median fare is $219. Other affordable months include January, with a median fare of $270, and February, where the median fare is $272.

How much is a round trip from St. Louis to Phoenix

Regular price: $228 - $346

Prices are currently below the regular range for flights from St. Louis to Phoenix.

The regular price range for flights from St. Louis to Phoenix is typically between $228 and $346. The current lowest deal is $156 with Frontier Airlines, for travel from Jul 20-Jul 29.

now $156

Low $228

High $346

The cheapest time to fly from St. Louis to Phoenix

The cheapest month to fly from St. Louis to Phoenix is April, with a median price of $219. The most expensive month is May, with a median price of $723. Prices are generally lower from January to December.

April

Cheapest

Flights from $219

May

Most Expensive

Flights from $723

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from St. Louis to Phoenix

Southwest Airlines

Last-minute flights going from St. Louis to Phoenix

Tue, Jun 16

⌛ Last-Minute

STL - Phoenix

St. Louis (STL) - Phoenix (PHX)

Frontier Airlines

$451

$337

One-way

Wed, Jun 17

⌛ Last-Minute

STL - Phoenix

St. Louis (STL) - Phoenix (PHX)

Frontier Airlines

$453

$337

One-way

Thu, Jun 18

⌛ Last-Minute

STL - Phoenix

St. Louis (STL) - Phoenix (PHX)

Frontier Airlines

$456

$354

One-way

Sun, Jun 28

⌛ Last-Minute

STL - Phoenix

St. Louis (STL) - Phoenix (PHX)

Frontier Airlines

$360

$292

One-way

Wed, Jul 1

⌛ Last-Minute

STL - Phoenix

St. Louis (STL) - Phoenix (PHX)

Frontier Airlines

$301

$247

One-way

Wed, Jul 1

⌛ Last-Minute

STL - Phoenix

St. Louis (STL) - Phoenix (PHX)

Frontier Airlines

$301

$250

One-way

Biggest price drops on these dates for flights from St. Louis to Phoenix

2 nights

Aug 17 - Aug 19

$377 → $166

56%

2 nights

Aug 24 - Aug 26

$376 → $167

56%

7 nights

Aug 25 - Sep 1

$359 → $173

52%

7 nights

Aug 18 - Aug 25

$359 → $173

52%

Popular Airports to fly from St. Louis to Phoenix

St. Louis - Phoenix route insights

💸 Price insights

Recent fares are below the typical level.

Recent fares from St. Louis to Phoenix are below the typical level, with a median of $409.

📅 Best time to fly

April is historically the cheapest month to fly.

Historically, April is the cheapest month to fly from St. Louis to Phoenix, with a median price of $219.

⏱️ Flight duration

Flights typically take 12h 18m.

The typical flight duration from St. Louis to Phoenix is 12 hours and 18 minutes.

✈️ Airlines & availability

Connecting flights are dominant.

Connecting flights are dominant on this route, with a median of 2 stopovers when connecting.

🏆 Airline highlight

Southwest Airlines offers direct flights.

Southwest Airlines is one of the airlines that offers direct flights on this route.

🎯 Booking tip

Deals are frequent on this route.

Deals for flights from St. Louis to Phoenix are frequent, with over 1 deal per day.

St. Louis main airports to depart from

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International Airport is a good choice for flights from St. Louis to Phoenix.

📍 ~20 km from city center (reachable by car)

💸 Flights from ~$156

Phoenix main airports to arrive at

Phoenix Sky Harbor International (PHX)

Cheapest

Phoenix Sky Harbor International Airport is a convenient arrival point for flights from St. Louis.

📍 ~7 km from Phoenix (reachable by car, bus, or metro).

💸 Flights from ~$158

Phoenix–Mesa Gateway (AZA)

Phoenix–Mesa Gateway Airport offers an alternative arrival option for your trip from St. Louis.

📍 ~50 km from Phoenix (reachable by car).

💸 Flights from ~$269

Airports nearby Phoenix used as alternative

Tucson International (TUS)

Tucson International is a reliable alternative for Phoenix with a full range of cabin classes.

📍 ~180 km from Phoenix (approximately a 1.5 to 2-hour drive)

💸 Flights from ~$303

Harry Reid International Airport (LAS)

Cheapest

Harry Reid International Airport offers competitive pricing and direct flight options to Phoenix.

📍 ~400 km from Phoenix (approximately a 4.5 to 5-hour drive)

💸 Flights from ~$97

Palm Springs International (PSP)

Palm Springs International is a well-equipped alternative for travelers to the west side of Phoenix.

📍 ~220 km from Phoenix (reachable by car)

💸 Flights from ~$316

Flagstaff Pulliam (FLG)

Flagstaff Pulliam is a relatively close option for residents in North Phoenix with simple terminal navigation.

📍 ~200 km from Phoenix (reachable by car)

💸 Flights from ~$533

Ernest A. Love Field (PRC)

Ernest A. Love Field is useful for very specific regional connections to Phoenix.

📍 ~140 km from Phoenix (reachable by car)

💸 Flights from ~$554

Business & First Class Flight Deals to Phoenix

40% AI deal score

$2,745

Frequently Asked Questions About Flights to Phoenix

Historically, the best prices for flights from St. Louis to Phoenix are found when booking 7-13 days in advance, with an average price of $329. Booking within 0-6 days of departure typically sees a significantly higher average price of $957. For those planning further ahead, flights booked 28-59 days out averaged $354, while those booked 60+ days in advance had an average price of $505. These trends are based on pricing across the trailing 90 days.

Across the trailing quarter, a good price for a flight from St. Louis to Phoenix is considered to be $318 or less. The median price for this route over the same period was $409. Prices can vary, with 75% of flights historically costing $759 or less. These figures provide a benchmark for travelers seeking value on this route.

Historically, April has offered the cheapest flights from St. Louis to Phoenix, with a median price of $219. January and February also tend to be more affordable, showing median prices of $270 and $272, respectively. The annual median price for this route is $409, indicating that these specific months offer notable savings compared to the yearly average. These insights are based on pricing data over the trailing 270 days.

Related routes

Consider alternative routes from St. Louis

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