$33 Find Cheap Flights 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 to St. Charles departing on 5/9. 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
$108
Typical prices: $315-$167
Frontier
Fri 5/1Mon 5/4
DEN - STL • Non-stop
Cheapest one-way
$33
Typical prices: $110-$188
Frontier
Sat 5/9
DEN - STL • Non-stop
Arrival airport
You can't fly directly to St. Charles. It is served by St. Louis (STL), located 7.2 miles from St. Charles.
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Flight Deals
Useful Info
Flight Deals

Cheap Flights to St. Charles

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights 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 to St. Charles

Fri, May 1 - Mon, May 4
Frontier Logo
4:09 pm - 7:21 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
8:17 pm - 9:50 pm
STL
-
DEN
2h 33mnonstop
$108Frontier
Sat, Apr 25 - Mon, Apr 27
Frontier Logo
4:20 pm - 7:32 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
9:55 pm - 8:00 pm
STL
-
DEN
23h 05m
1 stop
$109Frontier
Mon, May 4 - Wed, May 13
Delta Logo
5:27 pm - 9:19 pm
IAD
-
STL
4h 52m
1 stop
Delta Logo
1:27 pm - 6:43 pm
STL
-
IAD
4h 16m
1 stop
$271Delta
Mon, Apr 20 - Fri, Apr 24
Delta Logo
11:14 pm - 9:42 am
SEA
-
STL
8h 28m
1 stop
Delta Logo
12:23 pm - 4:45 pm
STL
-
SEA
6h 22m
1 stop
$272Delta
Sat, Apr 25 - Mon, Apr 27
United Airlines Logo
9:00 am - 10:31 am
IAD
-
STL
2h 31mnonstop
United Airlines Logo
11:15 am - 7:23 pm
STL
-
IAD
7h 08m
1 stop
$275United Airlines
Wed, Apr 22 - Fri, Apr 24
Southwest Logo
11:35 am - 10:00 pm
SEA
-
STL
8h 25m
2 stops
Southwest Logo
5:45 am - 5:00 pm
STL
-
SEA
13h 15m
2 stops
$277Southwest
Sun, Apr 19 - Tue, Apr 21
Southwest Logo
11:55 pm - 10:15 am
SEA
-
STL
8h 20m
1 stop
Southwest Logo
5:15 am - 1:35 pm
STL
-
SEA
10h 20m
2 stops
$278Southwest
Wed, Apr 29 - Wed, May 6
American Airlines Logo
8:29 am - 2:03 pm
LGA
-
STL
6h 34m
1 stop
American Airlines Logo
12:27 pm - 6:00 pm
STL
-
LGA
4h 33m
1 stop
$293American Airlines
Wed, Apr 29 - Wed, May 6
American Airlines Logo
7:58 am - 1:22 pm
JFK
-
STL
6h 24m
1 stop
American Airlines Logo
5:51 am - 8:03 pm
STL
-
JFK
13h 12m
1 stop
$293American Airlines
Sat, May 9 - Sun, May 10
United Airlines Logo
9:59 pm - 11:57 pm
EWR
-
STL
2h 58mnonstop
United Airlines Logo
6:15 am - 9:49 am
STL
-
EWR
2h 34mnonstop
$357United Airlines
Useful Info

Good to know - Book Cheap St. Charles Plane Tickets

Low seasonJanuary
Cheapest flight$33
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Denver to St. Louis

Flights to St. Charles: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew to St. Charles 
WaleFlew with United Airlines
IAH
-
STL
Dec 2025
Make sure your electronics are charged before boarding, the plane doesn’t have power outlets
Verified travelerFlew with Alaska Airlines
SEA
-
STL
Jul 2025
Give yourself extra time. Love the self check in options.
LarryFlew with Southwest
LAX
-
STL
Apr 2024
For long flights on airlines built for short flights (SWA) anyone over 5’ 10” is going to get cramped. Consider an Economy Plus upgrade when available.
Verified travelerFlew with Alaska Airlines
SEA
-
STL
Feb 2024
Be sure to measure your wheels for carry on my luggage was the correct size but the wheels made it over so had to check my bag wasn't happy about that since you have to pay for checked should at least get one free.

FAQs - booking St. Charles flights

  • How long is the flight to St. Charles?

    Flights from Boston2h 55m
    Flights from Philadelphia2h 21m
    Flights from Washington, D.C.2h 18m
    Flights from New York2h 40m
    Flights from Denver2h 22m
  • What is the cheapest flight to St. Louis?

    In the last 3 days, the cheapest flight deal to St. Louis was found on the route from Denver, at $108 return. The most popular connection is from New York to St. Louis and KAYAK users have found round-trip deals for as low as $293 in the last 3 days.

  • Which airlines fly to St. Louis?

    Many airlines fly to St. Louis, the most common ones being Southwest, American Airlines, and United Airlines. See the amount of flights per week for popular airlines flying to St. Louis.

  • How to fly to St. Charles?

    You cannot fly directly to St. Charles. KAYAK recommends you fly to Lambert-St Louis (STL) (7.16 miles from St. Charles). From there you can rent a car or get a taxi.

  • What airports are near St. Charles?

    The closest airport is Lambert-St Louis (STL) (7.16 mi). Other nearby airports are Springfield Capital (SPI) (85 mi) or Columbia Regional (COU) (92.78 mi). KAYAK recommends you fly to Lambert-St Louis.

  • How far is Lambert-St Louis Airport from central St. Louis?

    You’ll need to travel 13 miles to reach the St. Louis city center from Lambert-St Louis Airport.

  • What is the name of St. Louis’s airport?

    All flights to St. Louis land at Lambert-St Louis Airport. The airport code is STL,and it can also be referred to as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl.

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

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

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

  • What is the Hacker Fare option on flights 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to St. Charles

  • There is no major airport in St. Charles. It is instead served by Lambert-St Louis Airport.
  • Looking for cheap airfare to St. Charles? 25% of our users found round-trip tickets to St. Charles for the following prices or less: From Fort Lauderdale $271, from Miami $307, from Los Angeles $334
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest St. Charles flight deals.

Reviews of the top 5 airlines flying to St. Charles

 
Need help choosing which airline to fly with from the United States 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 4339 reviews
8.1Boarding
7.5Entertainment
7.0Food
8.6Crew
8.0Comfort
Airline reviews

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

2.0 MediocreJames, Apr 2026
LAX - MCO
Read more Southwest reviews

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

Plane was late. Zero service for 2+ hour flight and it was not that bumpy.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

Great flight. Good snacks and drinks. Grateful it was free. The flight from Nashville to louisville, i think her name was Tracy (not sure that's right) super awesome, nice and cheerful. She really enjoyed being at work today! She was the person who scanned the boarding pass on flight wn941. She should be recommended for a raise !

We departed and landed early which was a nice surprise. The boarding process was slow.

N Everything was perfect from boarding to assistance to baggage in Tampa

Subpar. The seating on the plane is almost unbearable. We are literally touching and/or sitting on each other which is totally unacceptable and shameful. Pilots and crew was very accommodating and friendly.

The boarding was organized and informative but the plane was tight meaning that you were sitting on one another and extremely uncomfortable. It’s disappointing that can’t have common seating comfort on the plane.

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

I was told that they needed to check my bag at the gate and to pick it up at the gate in Richmond. No big deal. I know they can't control the weather, but we flew around RIC for 45 minutes to avoid the storm and were 25 minutes late leaving as well. Once we landed, we were told to go to baggage claim to pick up our luggage. I went to bathroom, paid for parking, and went to the assigned baggage claim location. United flight people came down with us as well. They got their luggage immediately. Next, South West people came down about 10 minutes later. They got their luggage next. We finally got our luggage around 30 minutes in waiting. Was not a wonderful experience. No reflection on Delta, but the ground crew was lousy at best.

Everything could have benn better. Short fly, no food, no entertainment and no wifi.

Flight delayed. Air broken. Cabin was hot enough to pass out. Delta shuttle’s becoming worse and worse.

my mom urmila patel needed a wheelchair which was not available on the curbside. she needed to walk almost 50 meters inside (at the risk of falling) and then had to wait in line to get a wheelchair (this is not ok). Once obtained she had to seat in it for 30-45 minutes for someone to take her in thru the checkin process (which was fairly smooth and easy). the lady who helped her with her checkin process was very courteous and helpful

On the return flight, flight attendant Britt went out of her way to inform passengers that several of us had tight connections.

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

The boarding process was straightforward. One pertinent observation regarding all boarding procedures is that if an individual requires assistance or possesses a special status and is part of preboarding, it is advisable to limit the number of passengers who can preboard with them, rather than the entire, sometimes large, companion groups. The seats are uncomfortable, and the entertainment options are significantly inferior compared to other airlines. During the snack service, I requested an additional bag of snacks, but my request was denied. Initially, the flight attendant agreed to my request.becoming a strange accurate moment. The flight duration was four hours.

The flight was officially delayed 3 times, and was actually later than that. Combined, it was a 3 hour delay, but there was no recognition (miles, voucher, etc). The crew seemed stressed. The captain sounded nervous in his announcements. The flight itself was smooth and uneventful.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

It was perfect! I've never flown with United before, but I definitely will in the future

I had a cancelled flight because of technical issues going to my destination, and a delayed flight coming home. All told it wasn’t a total bust.

Just a bad day to fly. Flight was delayed from scheduled 6:50 pm departure to 8:50 pm. Combination of factors mostly related to weather at the destination airport (which is where the incoming flight originated) which delayed the inbound flight over an hour. Once on board, we taxied but had to hold again on the taxiway for 10 minutes or so. We did not get wheels up until after 9 pm. The flight was smooth but about 18 minutes from our destination, we had to hold for several minutes more due to weather at ORD. We finally landed at ORD about 11:08 pm (accounting for the time difference, that was about a 3 hour delay from our scheduled departure time). It felt like we were never going to get to our destination. But the flight crew and attendants were very good. The movie selection onboard was also very nice. Got to watch half of a movie just during our taxi from the gate at ATL due to the delay!

Fine. The issues I had were associated with luggage being delayed from Turkey to Tanzania

No meal service to the back of the plane as it started late or was too slow to get it out before it was time to land.

Terrible, if possible won't be flying again anytime soon!

Delays experienced in boarding/take off due to incoming plane delayed. However, the boarding time/depart time in the app was significantly delayed in providing these updates. Usually not updated until an hour after we should have already boarded. Poorly managed.

Bag drop was very disorganized in Miami. All main cabin passengers were shunted to just a few lanes and they had an equal number of lanes for first class passengers but there was nobody on those lines. They did nothing to bring the main cab and passengers over to the open lines and they just had employees standing there and doing nothing

there are no options s for snack besides cookies would ve nice to have a salty option n

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Human interaction. Thought there would be more service-even a smile would have been nice.

It was canceled at the last minute. While I was literally at the airport. Messed my entire trip up.

Seat was VERY uncomfortable. Flight was delayed and then boarded slowly. The crew was super helpful with boarding and supporting maximizing the luggage in the overhead.

Crew at the gate was very crabby and not at all polite. The plane was very hot the entire flight. And the seat cushion was very worn out.

Incoming flight was delayed, delaying boarding. It then took 30 mins to take off. Took 20 mins to get to a gate because they changed the gate last minute, crew weren’t ready so there was no one staffed to work the jet bridge. Boarding was so disorganized as is usual with American because everyone just stands around the gate regardless of boarding group.

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Everything you need to know for your flight to St. Charles