A spacious airport terminal with clear signage for gates, a nursing room, and an animal relief area.

$83 Cheap Flights from St. Louis (STL) to Phoenix (PHX)

View $83 flight on Wed, Oct 7, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Phoenix Sky Harbor Intl. Airport (PHX)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from St. Louis to Phoenix (STL-PHX)

Prices were available within the past 7 days and start at $83 for one-way flights and $165 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Dec 2 - Mon, Dec 7
STL
St. Louis
PHX
Phoenix
$165 Roundtrip, found 5 hours ago
$165
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Wed, Dec 2 from St. Louis to Phoenix, returning Mon, Dec 7, priced at $165 found 5 hours ago
Frontier Airlines
Sat, Oct 31 - Sat, Nov 7
STL
St. Louis
PHX
Phoenix
$175 Roundtrip, found 3 hours ago
$175
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Oct 31 from St. Louis to Phoenix, returning Sat, Nov 7, priced at $175 found 3 hours ago
Frontier Airlines
Fri, Oct 16 - Sat, Oct 24
STL
St. Louis
PHX
Phoenix
$182 Roundtrip, found 4 hours ago
$182
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, Oct 16 from St. Louis to Phoenix, returning Sat, Oct 24, priced at $182 found 4 hours ago
Frontier Airlines
Sat, Nov 7 - Wed, Nov 11
STL
St. Louis
PHX
Phoenix
$188 Roundtrip, found 16 hours ago
$188
Roundtrip
found 16 hours ago
Select Frontier Airlines flight, departing Sat, Nov 7 from St. Louis to Phoenix, returning Wed, Nov 11, priced at $188 found 16 hours ago
Frontier Airlines
Wed, Dec 2 - Sat, Dec 5
STL
St. Louis
PHX
Phoenix
$190 Roundtrip, found 8 hours ago
$190
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Wed, Dec 2 from St. Louis to Phoenix, returning Sat, Dec 5, priced at $190 found 8 hours ago
Frontier Airlines
Sat, Oct 3 - Wed, Oct 7
STL
St. Louis
PHX
Phoenix
$192 Roundtrip, found 5 hours ago
$192
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, Oct 3 from St. Louis to Phoenix, returning Wed, Oct 7, priced at $192 found 5 hours ago
Southwest Airlines
Fri, Oct 16 - Mon, Oct 19
STL
St. Louis
PHX
Phoenix
$360 Roundtrip, found 5 hours ago
$360
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Fri, Oct 16 from St. Louis to Phoenix, returning Mon, Oct 19, priced at $360 found 5 hours ago
American Airlines
Mon, Oct 5 - Sat, Oct 10
STL
St. Louis
PHX
Phoenix
$365 Roundtrip, found 3 hours ago
$365
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Mon, Oct 5 from St. Louis to Phoenix, returning Sat, Oct 10, priced at $365 found 3 hours ago
Delta
Mon, Nov 23 - Thu, Dec 3
STL
St. Louis
PHX
Phoenix
$403 Roundtrip, found 5 hours ago
$403
Roundtrip
found 5 hours ago
Select Delta flight, departing Mon, Nov 23 from St. Louis to Phoenix, returning Thu, Dec 3, priced at $403 found 5 hours ago
United
Tue, Oct 6 - Sat, Oct 10
STL
St. Louis
PHX
Phoenix
$417 Roundtrip, found 1 hour ago
$417
Roundtrip
found 1 hour ago
Select United flight, departing Tue, Oct 6 from St. Louis to Phoenix, returning Sat, Oct 10, priced at $417 found 1 hour ago

Alternative airports near Phoenix

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sky Harbor Intl. PHX. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $460
PHX
Sky Harbor Intl.
CheapestClosest
Average driving time to city center10 min
Flights from $460

What you need to know for your flight from Lambert-St. Louis Intl. to Sky Harbor Intl.

St. Louis (STL) to Phoenix (PHX) at a glance

Travel from St. Louis (STL) to Phoenix (PHX) and choose from a variety of airlines on this domestic short-haul route. Explore options from both full-service and budget carriers to discover the best itinerary that meets your needs and budget while you visit Phoenix's iconic attractions and neighborhoods. Get ready to find key details for flights departing from Lambert-St. Louis International Airport (STL) to Sky Harbor International Airport (PHX).

  • Fastest flight duration: around 3h 30m non-stop
  • Route distance: roughly 1,300 miles (2,090 km)
  • Flights per week: around 30+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $75–$375, depending on seasonality and how far ahead you book

Flights from Lambert-St. Louis International Airport (STL) to Sky Harbor International Airport (PHX)

Based on the latest traveler bookings, here are the top airlines favored for flights from St. Louis to Phoenix, particularly for non-stop and one-stop options. Popular layover spots include Denver International Airport (DEN) with a layover of approximately 1 hour and 15 minutes, Harry Reid International Airport (LAS) at around 1 hour and 30 minutes, and Salt Lake City International Airport (SLC) also at about 1 hour and 15 minutes. These choices allow you to balance price, total travel time, and cabin class for the best travel experience.

  • Southwest Airlines: This budget-friendly airline provides both non-stop and one-stop flight options. One-way ticket prices generally fall between $105 and $400, accounting for about 51% of departures on this route, with a standard non-stop travel duration of 3 hours and 30 minutes.
  • American Airlines: A major full-service airline, it offers non-stop and one-stop flights, with one-way fares typically ranging from $100 to $405. It represents around 30% of departures on this route, featuring a usual non-stop flight time of 3 hours and 30 minutes.
  • Frontier Airlines: Known for its low-cost fares, this airline provides both non-stop and one-stop options. One-way prices usually range from $75 to $220, capturing about 12% of departures on this route, with an average non-stop travel time of 3 hours and 30 minutes.
  • United: This full-service airline offers non-stop and one-stop services, with one-way fares varying between $130 and $410. It accounts for roughly 5% of departures on this route, with a typical one-stop journey time of 4 hours and 45 minutes, totaling around 6 hours of travel.
  • Delta: Offering one-stop flights, this full-service carrier presents one-way fares generally from $120 to $495. It makes up about 2% of departures on this route, with an in-flight duration of approximately 4 hours and 45 minutes and a total travel time near 6 hours, including layovers.

Travelers flying from St. Louis to Phoenix can opt to upgrade to first class with either American Airlines or Delta, enhancing their journey with premium service and comfort.

Best time to fly from St. Louis (STL) to Phoenix (PHX)

The most popular months for travelers flying from St. Louis to Phoenix are February, March, and April, when peak temperatures in Phoenix reach up to 74.5°F in April. If you prefer quieter travel, consider August, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 94.8°F. For better deals, November usually offers the lowest average one-way fare around $161. Flight availability peaks in December, with approximately 40 flights per week, making it easier to find convenient departure times.

  • Cheapest time to fly: November usually offers good deals with average one-way fare around $161, roughly 22% cheaper than the yearly average.
  • Another budget-friendly time to fly: October typically offers an average one-way fare of around $171.
  • Most flight options: December has the highest number of flights from St. Louis to Phoenix, with approximately 40 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January55.4°F (13.0°C)Average26$211
February58.6°F (14.8°C)High30$212
March66.0°F (18.9°C)High36$250
April74.5°F (23.6°C)High32$225
May82.0°F (27.8°C)Average39$220
June92.3°F (33.5°C)Low29$243
July95.7°F (35.4°C)Low30$227
August94.8°F (34.9°C)Low26$197
September89.8°F (32.1°C)Average34$196
October77.7°F (25.4°C)Average35$171
November65.5°F (18.6°C)Average35$161
December55.4°F (13.0°C)Average40$197

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from St. Louis (STL) to Phoenix (PHX)

  • St. Louis to Scottsdale (STL-SCF): Located approximately 14 miles from Sky Harbor International Airport (PHX), Scottsdale Airport (SCF) provides convenient access for travelers heading to the area.
  • St. Louis to Phoenix (SUS-PHX): Spirit of St. Louis Airport (SUS) is about 16 miles from Lambert-St. Louis International Airport (STL), making it a practical choice for flights to Phoenix.
  • St. Louis to Mesa (STL-AZA): Phoenix - Mesa Gateway Airport (AZA) lies roughly 22 miles from Sky Harbor International Airport (PHX), offering an additional option for those flying into the region.

How to find the best prices for flights from St. Louis (STL) to Phoenix (PHX)

Getting some of the best deals on flights from St. Louis to Phoenix is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually found when booking 2-8 weeks in advance, which coincides with when most travelers make their reservations. Evening departures from 6 PM to 12 AM tend to be less expensive, while morning flights from 5 AM to 12 PM are more popular. Additionally, flying on Monday often offers lower prices, although Friday remains the busiest travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Sky Harbor International Airport from Lambert-St. Louis International Airport

Phoenix welcomes travelers from St. Louis with a range of transport options based on price, convenience, and proximity. Here's how to reach Phoenix efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Phoenix, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Sky Harbor International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Sky Harbor International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Sky Harbor International Airport, travelers can easily access nearby transport options on foot, with Terminal 3 Station, a metro station, located about 0.1 miles away, while the Phoenix Airport Bus Stop, a bus station, is about 0.2 miles away.

Frequently asked questions

How much does a flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) cost?
You can find cheap one-way flights from $83 and cheap return flights from $165 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) with Expedia. One-way flights usually range from $184 to $825, and return flights typically cost between $335 and $1529. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
The cheapest month to fly from STL to PHX is December when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
Choose from 2 airlines operating direct flights from STL to PHX:

  • American Airlines operates around 19 direct flights from STL to PHX every week
  • Frontier Airlines operates around 9 direct flights from STL to PHX every week

What is the cheapest airline that flies from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
Frontier Airlines is one of the cheapest airlines offering nonstop flights from St. Louis (STL) to Phoenix (PHX), with round-trip tickets starting from around $414. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
The best airline to fly with from St. Louis, MO (STL) to Phoenix, AZ (PHX) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. WN also offers the most daily flights from STL to PHX, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
There are approximately 8 nonstop flights per day from Lambert-St. Louis Intl. (STL) to Sky Harbor Intl. (PHX). For more options, look at flights that include layovers.
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
The earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) usually departs at around 5:00 AM, operated by American Airlines. This seasonal service is available in November, giving you a great opportunity to maximize your time in Phoenix. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
The most popular departure times for flights from Lambert-St. Louis Intl. (STL) to Sky Harbor Intl. (PHX) are in the early morning, from 6am to 9am. This time window accounts for about 25% of total traffic. Many major carriers, including Southwest Airlines and American Airlines, offer flights during this period. Many travelers prefer this because it allows for a full day of activities in Phoenix after landing.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
Flying nonstop from STL to PHX takes around 3 hours 30 minutes, with the route covering approximately 1,259 miles. Flights with a layover typically take 3 hours 30 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
First class seats are offered on the STL to PHX route. First class cabins are available on:

  • Delta Air Lines
  • American Airlines
  • United Airlines

How much is a business class flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
A non-stop, one-way business class flight from St. Louis, MO (STL) to Phoenix, AZ (PHX) typically costs between $688 - $974. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Phoenix from Lambert-St. Louis Intl. (STL)?
From Lambert-St. Louis Intl. (STL), you can fly into Sky Harbor Intl. (PHX) to reach Phoenix. Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), Love Field (DAL), Denver Intl. (DEN) before reaching Phoenix. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) Phoenix Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Sky Harbor Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$165
Distance
1259 mi
Average flight time
1 hour 23 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 December. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $83 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.

 

St. Louis to Phoenix Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

Explore a world of travel with Expedia