STL - PHX

$71 Find Cheap Flights from St. Louis to Phoenix Sky Harbor Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Phoenix departing on 9/4. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Phoenix Sky Harbor Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Phoenix, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Phoenix, as well as popular online travel agencies
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Flight Deals

Cheap Flights from St. Louis to Sky Harbor Intl (STL-PHX)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Sky Harbor Intl 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 St. Louis to Phoenix

Thu, Sep 25 - Sun, Sep 28
Frontier Logo
7:55 pm - 11:27 pmSTL-PHX
5h 32m1 stop
Frontier Logo
6:00 am - 9:06 amPHX-STL
25h 06m1 stop
$193Frontier
Find Deal
Thu, Oct 9 - Mon, Oct 13
Frontier Logo
7:52 pm - 8:19 pmSTL-PHX
26h 27m1 stop
Frontier Logo
9:59 pm - 9:07 amPHX-STL
9h 08m1 stop
$196Frontier
Find Deal
Thu, Oct 9 - Sun, Oct 12
Frontier Logo
7:52 pm - 8:19 pmSTL-PHX
26h 27m1 stop
Frontier Logo
9:59 pm - 9:07 amPHX-STL
9h 08m1 stop
$203Frontier
Find Deal
Thu, Oct 9 - Mon, Oct 13
Frontier Logo
7:52 pm - 8:19 pmSTL-PHX
26h 27m1 stop
Frontier Logo
2:27 pm - 7:26 pmPHX-STL
2h 59mnonstop
$205Frontier
Find Deal
Thu, Nov 13 - Sun, Nov 16
Frontier Logo
7:45 pm - 12:29 amSTL-PHX
5h 44m1 stop
Frontier Logo
10:53 pm - 9:07 amPHX-STL
9h 14m1 stop
$209Frontier
Find Deal
Thu, Oct 23 - Mon, Oct 27
Southwest Logo
5:15 am - 6:35 amSTL-PHX
3h 20mnonstop
Southwest Logo
6:55 pm - 11:50 pmPHX-STL
2h 55mnonstop
$231Southwest
Find Deal
Wed, Oct 22 - Fri, Oct 24
Delta Logo
7:30 pm - 11:38 pmSTL-PHX
6h 08m1 stop
Delta Logo
12:40 am - 8:51 amPHX-STL
6h 11m1 stop
$237Delta
Find Deal
Thu, Nov 6 - Tue, Nov 11
American Airlines Logo
2:29 pm - 5:05 pmSTL-PHX
3h 36mnonstop
American Airlines Logo
7:55 pm - 11:51 pmPHX-STL
2h 56mnonstop
$238American Airlines
Find Deal
Wed, Oct 22 - Fri, Oct 24
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
American Airlines Logo
12:18 am - 9:09 amPHX-STL
6h 51m1 stop
$239American Airlines
Find Deal
Fri, Oct 17 - Tue, Oct 21
Delta Logo
7:30 pm - 11:38 pmSTL-PHX
6h 08m1 stop
Delta Logo
5:15 pm - 12:24 amPHX-STL
5h 09m1 stop
$244Delta
Find Deal
Expert advice

Expert advice for your flight from St. Louis to Phoenix

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
American Airlines

Main Cabin Extra offers early boarding (Group 5) and complimentary alcoholic drinks for a small fee.


Download the American Airlines app for access to movies, TV series, and music during your flight.

Southwest

Enjoy two free checked bags up to 50 pounds each, ideal for travelers with extra luggage.


Use Southwest's app for in-flight entertainment; download it beforehand for streaming and messaging.

Read more about Southwestby Blane Bachelor
Airports
STL

Avoid peak hours at STL to skip crowded terminals and long security lines. Early mornings and afternoons are busiest.

Read more about STLby Yulia Denisyuk
PHX

Use the Sky Train for easy access to downtown Phoenix from PHX. It's free and connects to Terminals 3 and 4.

Read more about PHXby Laura Ratliff
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet Baskas

Harriet Baskas

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.

Read more
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor

Blane Bachelor

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.

Read more
Laura Ratliff

Laura Ratliff

Expert on PHX

Laura Ratliff

Laura Ratliff

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.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

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.

Read more
Booking Insights

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

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

Find cheap flights to Phoenix Sky Harbor Airport
Find cheap flights to Phoenix Sky Harbor Airport

Planning a trip from St. Louis to Phoenix? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What is the most popular layover airport when flying from St. Louis to Phoenix Sky Harbor Airport?

Percentage of 1-stop round-trip flights from St. Louis to Phoenix Sky Harbor Airport chosen by KAYAK users via each layover airport in the last 12 months (only includes trips with the same layover airport on both legs).

Denver (DEN) is the top choice – 58% of KAYAK users who clicked on 1-stop flights from St. Louis to Phoenix Sky Harbor Airport picked an itinerary connecting there.

What is the cheapest layover airport when flying from St. Louis to Phoenix Sky Harbor Airport?

Average round-trip price for 1-stop flights from St. Louis to Phoenix Sky Harbor Airport clicked by KAYAK users in the last 12 months (only includes trips with the same layover airport on both legs).

Flights via Orlando (MCO) offer the most affordable fares, with an average round-trip price of $202.

Which layover airport offers the shortest total travel time from St. Louis to Phoenix Sky Harbor Airport?

Shortest average total travel time for 1-stop one-way flights from St. Louis to Phoenix Sky Harbor Airport via different layover airports, based on KAYAK user data from the last 12 months.

Consider flying via Wichita (ICT) for the shortest journey. The average one-way travel time for flights connecting there is 4h 40m.

Which layover airport has the quickest connection when flying from St. Louis to Phoenix Sky Harbor Airport?

Average layover duration at different layover airports for 1-stop one-way flights from St. Louis to Phoenix Sky Harbor Airport, based on KAYAK user data from the last 12 months.

If you prefer a quick connection, Wichita (ICT) often has the shortest layovers from St. Louis to Phoenix Sky Harbor Airport, with an average of 0h 43m.

Good to know

Low seasonJune
Cheapest flight$71
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly with an average 21% increase in price.
Flight from St. Louis to Phoenix Sky Harbor Airport

When to book flights from St. Louis to Phoenix

Are your dates flexible? Find out the best times to travel from St. Louis to Phoenix 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.
  • Can I withdraw money at STL?

    If you’d like to withdraw some cash at STL, you’ll be able to do so with ease, given that this airport is full of operational ATMs. The ATMs are located near Gate A10 in Concourse A, the Mid-Level Stage of Terminal 1, Gate C15 in Concourse C, Gate E20 in Terminal 2, and the entrance doors of Terminal 2.

  • What is the most convenient way to travel from St. Louis to STL?

    The most convenient way to travel from St. Louis to STL is by taxi. This is because, aboard one of the taxis present in St. Louis, you’ll be able to travel comfortably with all your luggage from your preferred pickup point to the entrance of STL’s terminals.

  • Does PHX have a medical center?

    If you feel a bit unwell while on your flight from STL to PHX, before departing PHX, you can receive a quick medical check-up at XpresCheck. Located on Level 3 of Terminal 4, this clinic boasts well-trained professionals.

  • Does PHX have a chapel?

    In case you’d like to pray, meditate, or gather your thoughts before departing PHX, you’ll be able to do so, given that PHX has a chapel on Level 3 of Terminal 4. It’s worth mentioning that you can pray at this chapel, regardless of your faith, as it is an interfaith chapel.

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

  • Looking for a cheap flight? 25% of our users found flights on this route for $168 or less one-way and $311 or less round-trip.
  • St. Louis Lambert International Airport (STL) usually has security checkpoints characterized by lengthy lines. Time and again, passengers have missed their flights at this airport after being unable to go through its security checkpoints in time for their flights. To avoid such a fate, on the date you’re scheduled to fly to Phoenix, it’s in your best interest to reach this airport at least 2h before your flight.
  • If you require special in-flight services on your flight from STL to Phoenix Sky Harbor International Airport (PHX), you should contact and inform the airline you intend to travel with of the special assistance services you’ll require. It’s advisable that you do so when booking your flight or at least 72h before your flight.
  • STL features several on-site parking garages. This airport is also surrounded by a number of off-site garages. If you’d like to leave your car in a parking garage you can easily get to from the airport upon your return from your trip, you should leave it in an off-site garage, as off-site garages charge cheaper rates than the on-site garages.
  • If you travel to PHX with your pet, you can take advantage of the numerous designated pet relief areas at the airport. Some of these pet relief areas are outdoors, while others are indoors. The outdoor ones are located west of Terminal 3, outside the baggage claim area of Terminal 4, and at the northwest corner of the 44th Street PHX Sky Train station.
  • At PHX, you can easily rent a car, as the airport features a Rental Car Facility that houses branches for dependable car rentals like Alamo, Avis, Budget, Dollar, Enterprise, National, Payless, SIXT, and Thrifty. To get to this rental car facility, situated south of the airport’s complex, you will board an airport shuttle.

Prefer to fly direct from St. Louis to Phoenix Sky Harbor Airport?

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

Direct departures

Lambert-St Louis to Phoenix Sky Harbor Intl

Monday

Alaska Airlines, American Airlines, Southwest, +1 more

Alaska Airlines, American Airlines, +2 more

Tuesday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Wednesday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Thursday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Friday

Alaska Airlines, American Airlines, Southwest, +1 more

Alaska Airlines, American Airlines, +2 more

Saturday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Sunday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

See more direct flights

Direct returns

Phoenix Sky Harbor Intl to Lambert-St Louis

Monday

Alaska Airlines, American Airlines, Southwest, +1 more

Alaska Airlines, American Airlines, +2 more

Tuesday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Wednesday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Thursday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Friday

Alaska Airlines, American Airlines, Southwest, +1 more

Alaska Airlines, American Airlines, +2 more

Saturday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

Sunday

Alaska Airlines, American Airlines, Southwest

Alaska Airlines, American Airlines, +1 more

See more direct flights

Reviews of the top 5 airlines serving from St. Louis to Phoenix

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Phoenix. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Phoenix? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4243 reviews
7.5Entertainment
8.6Crew
7.0Food
8.1Boarding
8.0Comfort
Airline reviews

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

2.0 MediocreMike, Aug 2025AUS - BWI
Read more Southwest reviews

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

Southwest's seats are the least comfortable I have ever sat in.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Southwest like most American domestic airlines, is a mediocre airline. But it is among the cheapest. Oh well.

My flight was delayed 50 minutes and we were rushed to board to then sit for 15 minutes until the pilot arrived. Unacceptable since we could have waited to board. Also the delayed flight was updated AFTER we boarded to more than the 10 minutes as originally stated.

Other than a bit of a delay, everything was good. Again, the boarding process and picking seats is the only thing I don't enjoy.

If we are going to have to pay for luggage, make it easier to do. Put something on the app during check-in so I don't need to do it at the kiosk. I've done it twice recently and I ended up having to pay at the desk because something went wrong at the kiosk in Tampa.

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

The quality of Southwest Airlines continues to degrade each time I fly with them. If it were not for the free luggage, I would probably choose another airline. Their prices are a little bit competitive, but way too high for the quality of the service. Southwest is not unique in this way. Domestic flight in the United States of America has continued to be a lower and lower quality product. Very sad when you compare the quality of domestic airlines to that of many international airlines around the world.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Three seats in first class were broken and while they were able to still acommodate us it was looking very touch and go and they had others they could not acommodate

Mechanic delay in addition to a 2 hour change in takeoff time was frustrating.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

The flight attendants in SLC were rude. I arrived 40 minutes early to gate. Ticket said I needed check in for seat assignments and tried check in and attendants said they weren’t doing it. And proceeded to never call me to give me a ticket so when time to board I received the very last seat. Please relay to employees to do their job better..,

On this flight I felt the food offering was not as complete as on previous flights. The tomato salad was a bit off and there was nothing additional such a bread or butter. The breakfast was only one option, so you either ate what they had or ate nothing. The crew was efficient, but most seemed frustrated throughout the flight. The flight arrived early and was obstacle-free, so I’m overall quite happy, but the shine in the rest of the experience just wasn’t there.

The seats got pretty uncomfortable pretty fast. The armrests are bigger than on other planes, so I had less room in the actual seat. My butt hurt by the end of the flight. :/ comfort was the primary issue. The crew were fantastic!

I believe that a four-hour trip should have a meal. Delta had none.

Great flight with Delta! Boarding was quick and easy, the amenities were solid, and the plane was in great shape. The flight attendants had a fun, lively energy while staying professional. All in all, a smooth trip — even managed to catch up on some rest. Thanks, Delta!

I was uncomfortably cold on the plane. Other than that it was uneventful and therefore as enjoyable as a plane ride can be.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

I flew with my dog and had already purchased my dog’s ticket. Even that morning I had called costumer service to insure that my husband and I had seats together since the website was giving me an error when choosing our seats and the representative mentioned our dog. I showed up early to the airport and when I got to the gate and we started boarding I was help back and told that I was supposed to have a yellow tag and that I should have checked in at the counter for them to give me that tag. I was not aware of this, the representative on the phone did not say anything. Nor did I see it anywhere in the checking process online, so if you travel with a pet and are not checking in luggage, just know that you still have to go to the check in counter when arriving at the airport unless you want to be the last one to board and not have room for your carry on in the overhead bins. Other than that, I had a great experience.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

There was no food available for this red eye... one little waffle cookie for a 6+ hour flight... thank God I was able to sleep some

It is clear that someone knew, and competent, is in charge of food at United Airlines at least for the international flights. I was flying in coach, but the choices of the dinner were excellent. Tasty, and appropriate size. I had the beef, which was a little bit like a shepherds pie, and it was good. Nothing comparable has been served on a United flight in years. It will not be confused with three star food, but it is very good for airline food. Even better was the breakfast choice between a cinnamon roll and a breakfast sandwich. I chose the breakfast sandwich which was absolutely delicious and which I would happily order again at my local Starbucks or Panera. It is clear that someone knew indifferent is in charge of the food and it’s about time.

The flight was comfortable with the exit row and great service

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

As smooth as you can expect. Some issues with boarding because the previous plane took forever to deplane but overall, a good experience.

After a two hour delay, my flight was CANCELLED! No pilot available. Such BS.

I miss the screens they used to have for the long flights. I use a Kendal and it doesn’t work well with there WiFi. I tried my cell and the wifi was not good for it either this is the free wifi.

Update departure times in a more timely manner. We are not boarding on time if the plane isn’t arriving until after our scheduled departure time.

Very friendly and efficient and smooth boarding. We were even way early arriving at my destination. Thank you.

The trip was very smooth and they provided great customer service

We kept being told that the flight was full and that all overhead compartments were full and therefore had to check in our hand luggage. We were some of the last people to board and noticed that there was still sufficient space in the overhead compartments. We were obliged to check in hand luggage when there was space and so had to wait at luggage retrieval which took a while to then noticed damage to our luggage - not a great experience!

The seats were crammed and the guy in front of me wouldn't stop reclining. If AA is cramming extra rows in, they need to take away the reclining in coach. My knees were smashed for 4 1/2 hours and I was very close to confronting the passenger in front of me.

What, first class and not even a cup of coffee before landing at 5 am in First Class? Really?

I paid for what I got which was cheap, I brought my own entertainment. I knew what to expect, so I could be prepared. If you’re flying economy, check in early like me. I have no problems with my flight, was on time, staff were friendly, and overall good experience.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

sluggish boarding and arrival procedures, fake nice flight attendants, and lots of delays.

Disaster. They lied every step of the way. We ended up being delayed due to crew and then allegedly abandoned the flight because of a curfew at LGA. No rebooking to LGA at any reasonable time. No hotel. No meal vouchers. Had to sleep in the airport and fly to Newark instead. Will never fly Frontier again.

What I expected, nickeled and dined and a frontier flight attendant loudly complained about her job and lack of communication as she headed to the gate on her cell phone. Not professional.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

After boarding and un-boarding twice over 6+hours, the flight was canceled.

Severe turbulence. Captain never came on to reassure passengers after things settled down.

My first flight was delayed 5 hours. The 2nd flight was canceled til the next day and the never even tried to compensate for it. Worse I was delayed again on the flight the rebooked me on.

Boarding in Orlando was not good. Giant mob at the gate, should have been lines.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

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

Information on your arrival and departure airports

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