CA $234 Cheap Flights from Phoenix (PHX) to St. Louis (STL)

View CA $234 flight on Thu, May 28, 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 $234 for one-way flights and CA $503 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, May 28 - Wed, Jun 3
PHX
Phoenix
STL
St. Louis
CA $503 Roundtrip, found 1 day ago
CA $503
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, May 28 from Phoenix to St. Louis, returning Wed, Jun 3, priced at CA $503 found 1 day ago
American Airlines
Wed, Jun 17 - Wed, Jun 24
PHX
Phoenix
STL
St. Louis
CA $510 Roundtrip, found 1 day ago
CA $510
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jun 17 from Phoenix to St. Louis, returning Wed, Jun 24, priced at CA $510 found 1 day ago
American Airlines
Wed, Jun 17 - Wed, Jun 24
PHX
Phoenix
STL
St. Louis
CA $523 Roundtrip, found 1 day ago
CA $523
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jun 17 from Phoenix to St. Louis, returning Wed, Jun 24, priced at CA $523 found 1 day ago
Delta
Wed, Jun 17 - Wed, Jun 24
PHX
Phoenix
STL
St. Louis
CA $536 Roundtrip, found 1 day ago
CA $536
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Jun 17 from Phoenix to St. Louis, returning Wed, Jun 24, priced at CA $536 found 1 day ago
American Airlines
Wed, Jun 17 - Wed, Jun 24
PHX
Phoenix
STL
St. Louis
CA $537 Roundtrip, found 1 day ago
CA $537
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jun 17 from Phoenix to St. Louis, returning Wed, Jun 24, priced at CA $537 found 1 day ago
American Airlines
Wed, Jun 17 - Wed, Jun 24
PHX
Phoenix
STL
St. Louis
CA $550 Roundtrip, found 1 day ago
CA $550
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jun 17 from Phoenix to St. Louis, returning Wed, Jun 24, priced at CA $550 found 1 day ago
American Airlines
Thu, May 28 - Wed, Jun 3
PHX
Phoenix
STL
St. Louis
CA $552 Roundtrip, found 1 day ago
CA $552
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, May 28 from Phoenix to St. Louis, returning Wed, Jun 3, priced at CA $552 found 1 day ago
American Airlines
Thu, May 28 - Wed, Jun 3
PHX
Phoenix
STL
St. Louis
CA $553 Roundtrip, found 1 day ago
CA $553
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, May 28 from Phoenix to St. Louis, returning Wed, Jun 3, priced at CA $553 found 1 day ago
American Airlines
Wed, Jun 17 - Wed, Jun 24
PHX
Phoenix
STL
St. Louis
CA $563 Roundtrip, found 1 day ago
CA $563
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jun 17 from Phoenix to St. Louis, returning Wed, Jun 24, priced at CA $563 found 1 day ago
United
Thu, May 28 - Wed, Jun 3
PHX
Phoenix
STL
St. Louis
CA $600 Roundtrip, found 1 day ago
CA $600
Roundtrip
found 1 day ago
Select United flight, departing Thu, May 28 from Phoenix to St. Louis, returning Wed, Jun 3, priced at CA $600 found 1 day ago

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from CA $653
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city centre20 min
Flights from CA $653

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?
One-way flights typically cost between $550 and $2,142 and return flights often range between $1,045 and $3,439. 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 Anaa (AAA) to Toronto, ON (YYZ-Pearson 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
November is typically the cheapest month to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), with average round-trip fares of approximately 866 CAD. This is about 13% lower than the average price throughout the year. November often sees lower prices as the peak holiday travel season approaches, but before the busiest travel days. Other cheap months to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) include September and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter PHX to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
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.) (PHX) to St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, F9 typically offers the lowest fares. WN offers the most daily flights from Phoenix, AZ (PHX-Sky Harbor Intl.) (PHX) to St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL), 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.)?
Based on booking data from the past year, the cheapest months to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) are typically November and October, with average round-trip flights around 866 CAD. However, the most popular months for this route are February and March, meaning you'll find plenty of flight options during those times. While there isn't a single month that is both the cheapest and most popular, you can choose between saving money in the autumn or having more flexibility with flight times in late winter/early spring.*Prices based on flights available on Expedia in the last year.
How many flights per day from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are 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 choice, look at flights that include layovers, as there are around 170 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 at approximately 12:05 AM local time, operated by Frontier Airlines. This is a seasonal service active in March. An early departure like this can help maximize 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 typically find the most flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) on a Friday, with around 113 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include WN, AA, and UA. Friday offers notably more flight options compared to other days of the week.
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 Sky Harbor International Airport (PHX) to St. Louis Lambert-St. Louis International Airport (STL) are in the morning, between 6am and 9am. About 27% of passengers prefer this time window. Southwest Airlines and United Airlines offer flights during this window. Many travelers prefer these early morning flights as they allow you to arrive at your destination with plenty of time to start 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 PHX to STL typically takes around 3 hours, covering approximately 1,259 miles. Connecting flights on this route usually add 4 hours to your travel time. 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 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Select the "Business class" and "First class" filters when looking for PHX to STL flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
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 from Sky Harbor Intl. (PHX)?
If you're planning to travel to St. Louis from Sky Harbor Intl. (PHX), you can fly into Lambert-St. Louis Intl. (STL) Some flights may connect through major hubs like Portland Intl. (PDX), Harry Reid Intl. (LAS), San Diego Intl. (SAN) 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, United
Roundtrip price
CA $502
Distance
2014 km
Average flight time
4 hours 54 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 $503 rising to CA $600.  

Here are more money-saving tips: 

  • Fly in May 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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