$77 Find Cheap Flights from Phoenix to St. Charles

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. Charles departing on 9/18. 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 from Phoenix Sky Harbor Intl Airport to St. Charles

Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Free to useThere are no hidden charges or fees.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Useful Info
Flight Deals

Cheap Flights from Phoenix to St. Charles (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. Charles 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. Charles

Tue, Sep 30 - Thu, Oct 9
Frontier Logo
8:00 am - 9:06 amPHX-STL
23h 06m1 stop
Frontier Logo
10:17 am - 9:39 amSTL-PHX
25h 22m2 stops
$232Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Frontier Logo
8:20 pm - 9:06 amPHX-STL
10h 46m1 stop
Frontier Logo
4:00 pm - 9:56 pmSTL-PHX
31h 56m2 stops
$234Frontier
Find Deal
Tue, Oct 21 - Wed, Oct 29
Delta Logo
12:40 am - 8:51 amPHX-STL
6h 11m1 stop
Delta Logo
6:50 am - 12:15 pmSTL-PHX
7h 25m1 stop
$237Delta
Find Deal
Tue, Oct 21 - Tue, Oct 21
Southwest Logo
5:10 am - 10:00 amPHX-STL
2h 50mnonstop
Southwest Logo
5:20 pm - 9:15 pmSTL-PHX
5h 55m1 stop
$239Southwest
Find Deal
Wed, Oct 22 - Sat, Oct 25
Delta Logo
12:40 am - 8:51 amPHX-STL
6h 11m1 stop
Delta Logo
6:50 am - 12:15 pmSTL-PHX
7h 25m1 stop
$244Delta
Find Deal
Thu, Oct 23 - Sat, Oct 25
American Airlines Logo
1:27 pm - 11:54 pmPHX-STL
8h 27m1 stop
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
$246American Airlines
Find Deal
Thu, Oct 9 - Tue, Oct 14
 Logo
11:37 am - 10:37 amPHX-STL
21h 00m2 stops
 Logo
7:52 pm - 6:21 pmSTL-PHX
24h 29m1 stop
Thu, Oct 9 - Tue, Oct 14
Southwest Logo
4:40 pm - 12:10 amPHX-STL
5h 30m1 stop
Southwest Logo
8:45 pm - 10:05 pmSTL-PHX
3h 20mnonstop
$259Southwest
Find Deal
Tue, Oct 14 - Tue, Oct 21
American Airlines Logo
3:25 pm - 8:27 pmPHX-STL
3h 02mnonstop
American Airlines Logo
7:00 am - 8:34 amSTL-PHX
3h 34mnonstop
$261American Airlines
Find Deal
Fri, Oct 3 - Sun, Oct 5
 Logo
8:20 pm - 9:06 amPHX-STL
10h 46m1 stop
 Logo
10:39 am - 10:42 pmSTL-PHX
14h 03m2 stops
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$77
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Phoenix to St. Louis

When to book flights from Phoenix to St. Charles

Are your dates flexible? Find out the best times to travel from Phoenix to St. Charles based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

FAQs for booking flights from Phoenix to St. Charles

  • Which airports will I be using when flying from Phoenix Sky Harbor Intl Airport to St. Charles?

    When flying out of Phoenix Sky Harbor Intl Airport you’ll be using Phoenix Sky Harbor Intl. St. Charles does not have its own airport so you’ll be flying into nearby Lambert-St Louis airport, which is 7.2 mi away.

  • How long does a flight from Phoenix Sky Harbor Intl Airport to St. Charles take?

    Direct flights cover the 1,258 miles separating Phoenix Sky Harbor Intl Airport and St. Charles in about 2h 50m.

  • How many flights are there between Phoenix Sky Harbor Intl Airport and St. Charles?

    8 direct flights run between Phoenix Sky Harbor Intl Airport and St. Charles on a daily basis. On average, there are about 60 departures each week.

  • What’s the cheapest day of the week to fly between Phoenix Sky Harbor Intl Airport and St. Charles?

    Consider leaving on a Tuesday and avoid Sundays if you are looking for the best rates. For your return to Phoenix Sky Harbor Intl Airport, you’ll find the best rates on Sundays and the most expensive ones on Tuesdays.

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

    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. Charles.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Charles 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. Charles?

    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. Charles with an airline and back to Phoenix with another airline.

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

    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. Charles from Phoenix up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from Phoenix Sky Harbor Intl Airport to St. Charles?

    In the last 72 hours, the cheapest one-way ticket between Phoenix Sky Harbor Intl Airport and St. Charles found on KAYAK was with Frontier for $77. Frontier offered a round-trip connection from $232 and Delta from $237.

Top tips for finding cheap flights from Phoenix Sky Harbor Intl Airport to St. Charles

  • There is no airport in St. Charles. Instead, you’ll be flying into St. Louis Lambert Airport when flying between Phoenix Sky Harbor Intl Airport and St. Charles.
  • The cheapest flight from Phoenix to St. Charles was found 87 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be December, January and February. The cheapest month to fly is September.

Reviews of the top 5 airlines serving Phoenix to St. Charles

 
Need help choosing which airline to fly with from Phoenix to St. Charles? 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 4246 reviews
8.1Boarding
8.6Crew
7.5Entertainment
7.0Food
8.0Comfort
Airline reviews

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.

6.0 GoodDavid, Aug 2025MCO - DEN
Read more Southwest reviews

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.

Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.

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.

There was supposed to be a meal served, but there wasn’t and the major toilet was out of order

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.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

This flight was perfect. No complaints and only the highest regard for the crew and ground staff and how they executed perfectly. I fly a lot with United and would request predictability and transparency in their operations instead of last minute changes.

I didn't like that my paid for seat was changed 2 hours before my flight.

Overall, a good experience. The food, however, was subpar. The breakfast was a joke.

First world problems, but still… We were seated in first class and asked for a cocktail on a very short, 50 minute flight. After our drink order was taken, a half hour went by, and we noticed that every other person in the small plane had been served except for us. We got up to ask about it, the drinks finally came, then were taken away three minutes later since the flight was so short. Really strange situation, on the other hand, we were in Utah.

Boarding took forever, the plane was cramped and cold, and the seatbelt song came on constantly throughout the red eye flight with a loud pre-recorded message playing each time

Wonderful crew and early arrival to our destination. It was so nice to have free wifi access and movies too. Thank you!

Bigger seats. Board back to front! Disembark front to back!

Plane was pretty clean, staff was friendly and helpful, flight left about on time arrived early. Took a long time to board and get off the plane - carry on items didn't have enough room so people had to move all around to find places.

Service in first class no longer exists on American Airlines .

My seat was very worn. Otherwise I had an excellent flight

Boarding can be more efficiently done by having the back row passengers board first. This way, the other people do the have to wait for front row passengers to load their luggage in the overhead cabins. Food is simply pathetic for the price I paid. Cleanliness is simply poor; my seat was full of crumps.

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 Phoenix to St. Charles

Complete your trip to St. Charles with a hotel stay or car rental

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.