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CA $212 Cheap Flights from Phoenix (PHX) to St. Louis (STL)

View CA $212 flight on Thu, Aug 20, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at CA $212 for one-way flights and CA $423 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Sep 3 - Mon, Sep 7
PHX
Phoenix
STL
St. Louis
CA $423 Roundtrip, found 3 days ago
CA $423
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Sep 3 from Phoenix to St. Louis, returning Mon, Sep 7, priced at CA $423 found 3 days ago
American Airlines
Fri, Sep 4 - Mon, Sep 7
PHX
Phoenix
STL
St. Louis
CA $435 Roundtrip, found 6 days ago
CA $435
Roundtrip
found 6 days ago
Select American Airlines flight, departing Fri, Sep 4 from Phoenix to St. Louis, returning Mon, Sep 7, priced at CA $435 found 6 days ago
American Airlines
Thu, Sep 3 - Mon, Sep 7
PHX
Phoenix
STL
St. Louis
CA $437 Roundtrip, found 3 days ago
CA $437
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Sep 3 from Phoenix to St. Louis, returning Mon, Sep 7, priced at CA $437 found 3 days ago
American Airlines
Thu, Aug 13 - Mon, Aug 17
PHX
Phoenix
STL
St. Louis
CA $440 Roundtrip, found 4 days ago
CA $440
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Aug 13 from Phoenix to St. Louis, returning Mon, Aug 17, priced at CA $440 found 4 days ago
Delta
Thu, Aug 13 - Mon, Aug 17
PHX
Phoenix
STL
St. Louis
CA $450 Roundtrip, found 4 days ago
CA $450
Roundtrip
found 4 days ago
Select Delta flight, departing Thu, Aug 13 from Phoenix to St. Louis, returning Mon, Aug 17, priced at CA $450 found 4 days ago
Delta
Thu, Aug 13 - Mon, Aug 17
PHX
Phoenix
STL
St. Louis
CA $454 Roundtrip, found 4 days ago
CA $454
Roundtrip
found 4 days ago
Select Delta flight, departing Thu, Aug 13 from Phoenix to St. Louis, returning Mon, Aug 17, priced at CA $454 found 4 days ago
American Airlines
Thu, Aug 13 - Mon, Aug 17
PHX
Phoenix
STL
St. Louis
CA $484 Roundtrip, found 4 days ago
CA $484
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Aug 13 from Phoenix to St. Louis, returning Mon, Aug 17, priced at CA $484 found 4 days ago
American Airlines
Thu, Aug 13 - Mon, Aug 17
PHX
Phoenix
STL
St. Louis
CA $490 Roundtrip, found 4 days ago
CA $490
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Aug 13 from Phoenix to St. Louis, returning Mon, Aug 17, priced at CA $490 found 4 days ago
Delta
Thu, Aug 13 - Mon, Aug 17
PHX
Phoenix
STL
St. Louis
CA $495 Roundtrip, found 4 days ago
CA $495
Roundtrip
found 4 days ago
Select Delta flight, departing Thu, Aug 13 from Phoenix to St. Louis, returning Mon, Aug 17, priced at CA $495 found 4 days ago
Alaska Airlines
Thu, Sep 3 - Mon, Sep 7
PHX
Phoenix
STL
St. Louis
CA $794 Roundtrip, found 3 days ago
CA $794
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Sep 3 from Phoenix to St. Louis, returning Mon, Sep 7, priced at CA $794 found 3 days ago

Frequently asked questions

How much does a flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from CA $212 and cheap return flights from CA $423 PHX to STL with Expedia. One-way flights typically cost between CA$285 and CA$1094, and return flights often range between CA$561 and CA$1843. 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 PHX to STL ticket fares go up or down.
What is the cheapest month to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you're looking for the cheapest time to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), November is typically your best bet. You can expect average return fares around CA$495 during this month. November often sees lower prices as the peak autumn travel season winds down before the busy holiday period. Other budget-friendly months to consider for this route include September and October.
Which airlines fly direct from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are 2 airlines offering direct flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.).
  • Southwest Airlines operates 29 direct flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) every week.
  • American Airlines operates 15 direct flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) every week.
What is the cheapest airline that flies from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Frontier Airlines is one of the cheapest airlines offering nonstop return flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), with tickets starting from around CA$108 for flights that can be booked for departure within the next year. Sun Country Airlines is one of the cheapest airlines offering connecting return flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), with tickets starting from around CA$580 for flights that can be booked for departure within the next year. 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The cheapest months to fly from Phoenix Sky Harbor International Airport (PHX) to St. Louis Lambert International Airport (STL) are typically November and October, with average return flights around CA$495. However, the most popular months for this route, offering plenty of flight options, are February and March. While there isn't a single month that is both the cheapest and most popular, you can weigh whether saving on your fare in the autumn or having more schedule flexibility in late winter/early spring is more important for your travel plans.
How many flights per day from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll find approximately 6 nonstop flights per day from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.). For even more choices, look at flights that include layovers, as there are around 128 connecting flights per day. Some common connection points include Seattle - Tacoma Intl. (SEA), O'Hare Intl. (ORD), and Denver Intl. (DEN).
What is the earliest flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Phoenix Sky Harbor International Airport (PHX) to St. Louis Lambert International Airport (STL) typically departs around 12:05 AM local time. This flight is operated by Frontier Airlines. This is a seasonal service, active only in March. 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll find the most flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) on Thursdays, with around 115 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, American Airlines, and United. Thursdays have notably more flight options compared to other days of the week, offering you greater flexibility.
What are the most popular departure times for flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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 St. Louis, giving you more time to enjoy your day.
How long does it take to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A nonstop flight from Phoenix Sky Harbor International Airport (PHX) to St. Louis Lambert International Airport (STL) typically takes around 3 hours. This route covers a distance of approximately 2,026 kilometres. If you opt for a flight with one stop, your travel time will be longer, usually around 6 hours. Flights with two or more stops generally take about 10 hours 18 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some extra time when planning your trip.
Can you fly business or first class from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly business class or first class between PHX and STL. You can fly business class with Frontier Airlines and Delta.First class cabins are available on:
  • Alaska Airlines
  • United
  • Delta
  • American Airlines

How do I earn miles on a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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 St. Louis, MO (STL) from Phoenix, AZ (PHX)?
If you're planning to travel to St. Louis from Sky Harbor Intl. (PHX), you can fly directly into Lambert-St. Louis Intl. (STL). Some flights may connect through major hubs like Portland Intl. (PDX), San Diego Intl. (SAN), or Harry Reid International Airport (LAS) before reaching St. Louis. 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis 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
Sky Harbor Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta
Roundtrip price
CA $422
Distance
2014 km
Average flight time
4 hours 56 mins

Book with confidence

Phoenix to St. Louis Flights

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

With Expedia, it’s simple to find and book flights to St. Louis from Phoenix 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 Lambert-St. Louis 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 Phoenix to St. Louis today, tomorrow, or this week.  

 

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

Sort your search results by price to find great deals on your flight from Phoenix to St. Louis—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to St. Louis from Phoenix currently is just CA $423 rising to CA $794.  

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 St. Louis  
  • 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 St. Louis from Phoenix 

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 St. Louis with Expedia today.

Phoenix to St. Louis Flights

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