PHX - STL

$87 Find Cheap Flights from Phoenix to St. Louis - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Phoenix to St. Louis departing on 10/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$298
Typical prices: $302-$425
Frontier
tors 8/27mån 8/31
PHX - STL • 1 stop
Cheapest non-stop
$310
Typical prices: $232-$377
Southwest
fre 10/9tis 10/13
PHX - STL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest includes a free carry-on; checked bags now cost extra.
American Main Cabin Extra adds early boarding and complimentary drinks.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
You can fly direct with American Airlines and Southwest. Average duration is 2h 57m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $251 (round-trip)
Shortest trip • 5h 21m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 7% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
Good to know
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Good to know
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Flight Deals
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Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Phoenix to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Phoenix to St. Louis

tors, aug 27 - mån, aug 31
Frontier Logo
6:00 am - 4:31 pm
PHX
-
STL
8h 31m
1 stop
Frontier Logo
7:58 pm - 11:39 pm
STL
-
PHX
5h 41m
1 stop
$298Frontier
ons, jul 22 - ons, jul 29
Frontier Logo
9:58 pm - 6:15 pm
PHX
-
STL
18h 17m
1 stop
Frontier Logo
7:03 pm - 11:05 pm
STL
-
PHX
6h 02m
1 stop
$299Frontier
fre, jul 31 - tors, aug 13
Frontier Logo
11:23 pm - 8:57 am
PHX
-
STL
7h 34m
1 stop
Frontier Logo
6:34 pm - 12:49 pm
STL
-
PHX
20h 15m
2 stops
$300Frontier
ons, sep 23 - sön, sep 27
Frontier Logo
10:55 pm - 11:51 am
PHX
-
STL
10h 56m
1 stop
Frontier Logo
10:35 am - 10:27 pm
STL
-
PHX
37h 52m
2 stops
$301Frontier
lör, jul 25 - ons, jul 29
Frontier Logo
6:24 am - 2:56 pm
PHX
-
STL
6h 32m
1 stop
Frontier Logo
7:03 pm - 11:05 pm
STL
-
PHX
6h 02m
1 stop
$303Frontier
fre, sep 25 - mån, sep 28
Frontier Logo
6:40 am - 7:15 pm
PHX
-
STL
10h 35m
1 stop
Frontier Logo
12:46 pm - 9:35 pm
STL
-
PHX
10h 49m
1 stop
$304Frontier
fre, sep 4 - mån, sep 7
Frontier Logo
10:30 pm - 5:50 pm
PHX
-
STL
17h 20m
1 stop
Frontier Logo
7:58 pm - 10:11 am
STL
-
PHX
16h 13m
1 stop
$305Frontier
fre, sep 4 - mån, sep 7
Frontier Logo
10:30 pm - 5:50 pm
PHX
-
STL
17h 20m
1 stop
Frontier Logo
7:58 pm - 1:17 pm
STL
-
PHX
19h 19m
1 stop
$306Frontier
tors, nov 5 - tis, nov 10
American Airlines Logo
7:54 pm - 11:50 pm
PHX
-
STL
2h 56mnonstop
American Airlines Logo
3:59 pm - 11:46 pm
STL
-
PHX
8h 47m
1 stop
$307American Airlines
tors, sep 3 - mån, sep 7
Frontier Logo
6:35 am - 7:13 pm
PHX
-
STL
10h 38m
1 stop
Frontier Logo
6:45 pm - 11:24 pm
STL
-
PHX
6h 39m
1 stop
$308Frontier
Booking Insights

KAYAK's insights & trends for Phoenix to St. Louis flights

Get data-powered insights and trends into flights from Phoenix to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Phoenix Sky Harbor Intl Airport to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Phoenix Sky Harbor Intl Airport to St. Louis departing in August.

What’s the cheapest day of the week to fly from Phoenix to St. Louis?

The average price of all round-trip flights from Phoenix Sky Harbor Intl Airport to St. Louis clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to St. Louis on a Friday and more expensive on a Sunday. On your return trip to Phoenix, you should consider flying back on a Wednesday, and avoid Sundays for better deals.

What is the cheapest month to fly from Phoenix Sky Harbor Intl Airport to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Phoenix Sky Harbor Intl Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Phoenix Sky Harbor Intl Airport to St. Louis is October, where tickets cost $307 (return) on average. On the other hand, the most expensive months are June and March, where the average cost of round-trip tickets is $453 and $440 respectively.

Can I save money by flying with a layover from Phoenix Sky Harbor Intl Airport to St. Louis?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $420 on average.

How far in advance should I book a flight from Phoenix Sky Harbor Intl Airport to St. Louis?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Phoenix Sky Harbor Intl Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Phoenix Sky Harbor Intl Airport to St. Louis, you should book around 2 weeks before departure, which saves you about 7% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Expert advice

Expert advice for your flight from Phoenix to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Laura Ratliff

Laura Ratliff

Expert on PHX

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Low seasonApril
Cheapest flight$87
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly with an average 9% increase in price.
Flight from Phoenix to St. Louis

When to book flights from Phoenix to St. Louis

Are your dates flexible? Find out the best times to travel from Phoenix to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Phoenix to St. Louis flights

  • Where can passengers sleep at Lambert International Airport?

    Seating with armrests is available in several locations across the airport, most of which are in Terminal 2 and Concourse C. It is recommended by reviewers that you bring a sleeping bag, travel blanket, or additional layers of clothing with you if you want to sleep at this airport since it is believed to be very chilly.

  • Are there any kid-friendly amenities at Lambert International Airport?

    Near gate C3 at STL is a play area designated specifically for children. This is an educational play exhibit with a transportation-based theme that has a child-sized facsimile of a light rail train and a MetroLink train as well as a child-sized airplane and air traffic control tower.

  • How can I get to downtown St. Louis from STL airport?

    If you are traveling downtown, using Metrolink is an option that is not only speedy but also affordable and easy. The St. Louis International Airport (STL) is about 15 miles from the city's central business district. It takes around 19min to complete.

  • How do I get from downtown Phoenix to PHX airport?

    No rail can take passengers directly from downtown Phoenix to the terminal building at the Phoenix airport. To begin, you will need to ride a Valley Metro Rail train to the rail station at 44th Street and Washington and then transfer to the free PHX Sky Train® to go to Terminal 3 or 4. The entire amount of time spent traveling is around half an hour.

  • What is the cheapest flight from Phoenix Sky Harbor Intl Airport to St. Louis?

    In the last 5 days, the lowest price for a flight from Phoenix Sky Harbor Intl Airport to St. Louis was $87 for a one-way ticket and $298 for a round-trip.

  • Do I need a passport to fly between Phoenix and St. Louis?

    No, a passport isn't needed to fly from Phoenix to St. Louis. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Phoenix to St. Louis?

    On your way to St. Louis, you’ll fly out from Phoenix Sky Harbor Intl. You’ll be landing at Lambert-St Louis.

  • Which airlines offer Wi-Fi service onboard planes from Phoenix to St. Louis?

    American Airlines, JetBlue, and Delta offer inflight Wi-Fi service on the Phoenix to St. Louis flight route.

  • Which aircraft models fly most regularly from Phoenix to St. Louis?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Phoenix to St. Louis flight route.

  • Which airline alliances offer flights from Phoenix to St. Louis?

    oneworld is the only airline alliance operating flights between Phoenix and St. Louis.

  • On which days can I fly direct from Phoenix to St. Louis?

    There are nonstop flights from Phoenix to St. Louis on a daily basis.

  • Which is the best airline for flights from Phoenix to St. Louis, Southwest or American Airlines?

    The two airlines most popular with KAYAK users for flights from Phoenix to St. Louis are Southwest and American Airlines. With an average price for the route of $415 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $384 and an overall rating of 7.1.

  • How does KAYAK find such low prices on flights from Phoenix to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Phoenix to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Phoenix to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Phoenix is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Phoenix to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Phoenix with another airline. Booking your flights between Phoenix and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Phoenix to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Phoenix up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Phoenix Sky Harbor Intl Airport to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $191 or less one-way and $349 or less round-trip.
  • Both within and outside of the terminals of Sky Harbor International Airport (PHX) are designated locations for pets to relieve themselves. The airport has eight locations for dogs to relieve themselves, drink water, and stretch their legs during layovers (mitts for cleaning up provided).
  • Is your journey to Phoenix taking longer than you thought, and do you need to keep your vehicle at Sky Harbor International Airport for a longer period than you first planned? The covered parking garage and the open parking lot are available to passengers who need to keep their automobiles at PHX for an extended period.
  • No matter which airline a customer is flying with, they are eligible to get a reduced rate to enter any of the lounges located in PHX. This is the greatest choice if you need to connect planes, if your trip was canceled, if you need to check in early in the morning, or if you want breakfast.
  • Phoenix Sky Harbor International Airport and Lambert International Airport (STL) provide services to assist guests who may have difficulties moving about the airport. Feel free to inquire about the assistance in renting a wheelchair and navigating the airport either before or after you go on your vacation. If you wish to use these services, you must give the airline plenty of notice in advance.
  • It is highly advised to pick up your rental automobile from Lambert International Airport as soon as you touch down. Passengers do not have to wait for a shuttle to a far-off place since there is a vehicle rental counter at the airport. Time is of the essence when it comes to renting an automobile.

Prefer to fly direct from Phoenix to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Phoenix Sky Harbor Intl to Lambert-St Louis.
Find which airlines fly direct from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

Phoenix Sky Harbor Intl to Lambert-St Louis

Monday

American Airlines,Southwest

American Airlines,Southwest

Tuesday

American Airlines,Southwest

American Airlines,Southwest

Wednesday

American Airlines,Southwest

American Airlines,Southwest

Thursday

American Airlines,Southwest

American Airlines,Southwest

Friday

American Airlines,Southwest

American Airlines,Southwest

Saturday

American Airlines,Southwest

American Airlines,Southwest

Sunday

American Airlines,Southwest

American Airlines,Southwest

See more direct flights

Direct returns

Lambert-St Louis to Phoenix Sky Harbor Intl

Monday

American Airlines,Southwest

American Airlines,Southwest

Tuesday

American Airlines,Southwest

American Airlines,Southwest

Wednesday

American Airlines,Southwest

American Airlines,Southwest

Thursday

American Airlines,Southwest

American Airlines,Southwest

Friday

American Airlines,Southwest

American Airlines,Southwest

Saturday

American Airlines,Southwest

American Airlines,Southwest

Sunday

American Airlines,Southwest

American Airlines,Southwest

See more direct flights

Everything you need to know for your flight from Phoenix to St. Louis

Other airlines flying from Phoenix to St. Louis

Flights from the other most popular airlines that fly from Phoenix to St. Louis according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.