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CA $176 Cheap Flights from St. Louis (STL) to Phoenix (PHX)

View CA $176 flight on Sat, Aug 8, 2026Opens in a new window

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

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Cheap flights from St. Louis (STL) to Phoenix (PHX)

Prices were available within the past 7 days and start at CA $176 for one-way flights and CA $422 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, Sep 21 - Thu, Sep 24
STL
St. Louis
PHX
Phoenix
CA $422 Roundtrip, found 3 days ago
CA $422
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Sep 21 from St. Louis to Phoenix, returning Thu, Sep 24, priced at CA $422 found 3 days ago
American Airlines
Mon, Sep 21 - Thu, Sep 24
STL
St. Louis
PHX
Phoenix
CA $435 Roundtrip, found 3 days ago
CA $435
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Sep 21 from St. Louis to Phoenix, returning Thu, Sep 24, priced at CA $435 found 3 days ago
Delta
Mon, Sep 21 - Thu, Sep 24
STL
St. Louis
PHX
Phoenix
CA $440 Roundtrip, found 3 days ago
CA $440
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Sep 21 from St. Louis to Phoenix, returning Thu, Sep 24, priced at CA $440 found 3 days ago
American Airlines
Mon, Aug 17 - Tue, Aug 18
STL
St. Louis
PHX
Phoenix
CA $449 Roundtrip, found 5 days ago
CA $449
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Aug 17 from St. Louis to Phoenix, returning Tue, Aug 18, priced at CA $449 found 5 days ago
Delta
Mon, Aug 17 - Tue, Aug 18
STL
St. Louis
PHX
Phoenix
CA $450 Roundtrip, found 5 days ago
CA $450
Roundtrip
found 5 days ago
Select Delta flight, departing Mon, Aug 17 from St. Louis to Phoenix, returning Tue, Aug 18, priced at CA $450 found 5 days ago
Delta
Mon, Sep 21 - Thu, Sep 24
STL
St. Louis
PHX
Phoenix
CA $454 Roundtrip, found 3 days ago
CA $454
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Sep 21 from St. Louis to Phoenix, returning Thu, Sep 24, priced at CA $454 found 3 days ago
Delta
Mon, Aug 17 - Tue, Aug 18
STL
St. Louis
PHX
Phoenix
CA $495 Roundtrip, found 5 days ago
CA $495
Roundtrip
found 5 days ago
Select Delta flight, departing Mon, Aug 17 from St. Louis to Phoenix, returning Tue, Aug 18, priced at CA $495 found 5 days ago
Delta
Mon, Aug 17 - Tue, Aug 18
STL
St. Louis
PHX
Phoenix
CA $498 Roundtrip, found 5 days ago
CA $498
Roundtrip
found 5 days ago
Select Delta flight, departing Mon, Aug 17 from St. Louis to Phoenix, returning Tue, Aug 18, priced at CA $498 found 5 days ago
United
Mon, Aug 17 - Tue, Aug 18
STL
St. Louis
PHX
Phoenix
CA $562 Roundtrip, found 5 days ago
CA $562
Roundtrip
found 5 days ago
Select United flight, departing Mon, Aug 17 from St. Louis to Phoenix, returning Tue, Aug 18, priced at CA $562 found 5 days ago
Alaska Airlines
Fri, Jul 31 - Sun, Aug 2
STL
St. Louis
PHX
Phoenix
CA $1,389 Roundtrip, found 3 hours ago
CA $1,389
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Fri, Jul 31 from St. Louis to Phoenix, returning Sun, Aug 2, priced at CA $1,389 found 3 hours 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 centre is 10 minutes. Flights from CA $756
PHX
Sky Harbor Intl.
CheapestClosest
Average driving time to city centre10 min
Flights from CA $756

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 CA $176 and cheap return flights from CA $422 STL to PHX with Expedia. Return flights often range between CA$594 and CA$2094. 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 STL to PHX ticket fares go up or down.
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 months to fly from STL to PHX are typically during off-peak season 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 are 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.)?
There are 2 airlines offering direct flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.). Here are the carriers:
  • Southwest Airlines operates 30 direct flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) every week.
  • American Airlines operates 15 direct flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) 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 return flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.), with tickets starting from around CA$108 for flights that can be booked for departure within the next year. Southwest Airlines offers one of the cheapest connecting return flights with a layover in Love Field (DAL), starting from around CA$209. These prices are per adult for economy/coach class. 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.
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-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) will differ from traveler to traveler. If you like to fly early, Southwest Airlines offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.), 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.)?
You'll find approximately 6 nonstop flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.). For even more choices, look at flights that include layovers, as there are around 141 connecting flights per day. Some common connection points include O'Hare Intl. (ORD), Dallas-Fort Worth Intl. (DFW), and Seattle - Tacoma Intl. (SEA).
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.) typically departs around 5:00 AM. This service is operated by American Airlines. This is a seasonal service, active in November. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.)?
You'll find the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) on a Friday, with around 98 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, American Airlines, and United. Flight schedules are quite consistent throughout the week, with Fridays having only slightly more options than other days.
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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Phoenix, AZ (PHX-Sky Harbor Intl.) are in the early morning, from 6am to 9am. Many major carriers, including Southwest Airlines, American Airlines and United, offer flights during this window. Many travelers prefer this because it allows for an early arrival in Phoenix, giving you more time to enjoy your day.
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 2,026 kilometers. 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.)?
Yes, you can fly business class or first class between STL and PHX. Airlines that offer business class service on this route include:
  • Frontier Airlines
  • Delta
First class cabins are available on:
  • Alaska Airlines
  • Delta
  • American Airlines
  • United
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, AZ (PHX) from St. Louis, MO (STL)?
If you're planning to travel to Phoenix from Lambert-St. Louis International Airport (STL), you can fly directly into Sky Harbor International Airport (PHX). Some flights may connect through major hubs like Seattle - Tacoma International Airport (SEA), Love Field (DAL), or Denver International Airport (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) to Phoenix, AZ (PHX) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL) to Phoenix, AZ (PHX) 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) to Phoenix, AZ (PHX) flight and hotel package?
Securing a St. Louis, MO (STL) to Phoenix, AZ (PHX) flight and hotel package 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, United
Roundtrip price
CA $421
Distance
2014 km
Average flight time
1 hour 11 mins

Book with confidence

St. Louis to Phoenix Flights

The easy way to book your flights from St. Louis to Phoenix 

With Expedia, it’s simple to find and book flights to Phoenix from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Sky Harbor Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to Phoenix today, tomorrow, or this week.  

 

Save dollars with cheap flights from Lambert-St. Louis Intl., STL to Sky Harbor Intl., PHX 

Sort your search results by price to find great deals on your flight from St. Louis to Phoenix—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Phoenix from St. Louis currently is just CA $422 rising to CA $1,389.  

Here are more money-saving tips: 

  • Fly in September when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Phoenix  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Phoenix from St. Louis 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Phoenix with Expedia today.

St. Louis to Phoenix Flights

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