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Find cheap flights from Denver to St. Charles from $32

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to St. Charles departing on 7/16. 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
0 bags
Mon 7/1
Mon 7/8

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Good to know

Low season

January

High season

May

Cheapest flight

$32
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from Denver to St. Louis

When to book flights from Denver to St. Charles

Are your dates flexible? Find out the best times to travel from Denver 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 Denver to St. Charles

  • Which airports will I be using when flying from Denver to St. Charles?

    When flying out of Denver you’ll be using Denver 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 Denver to St. Charles take?

    Direct flights cover the 767 miles separating Denver and St. Charles in about 2h 06m.

  • How many flights are there between Denver and St. Charles?

    18 direct flights run between Denver and St. Charles on a daily basis. On average, there are about 126 departures each week.

  • What’s the cheapest day of the week to fly between Denver and St. Charles?

    Consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to Denver, you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Charles from Denver 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 Denver 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 Denver with another airline.

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

    In the last 72 hours, the cheapest one-way ticket between Denver and St. Charles found on KAYAK was with Frontier for $32. Frontier offered a round-trip connection from $56 and United Airlines from $142.

See more FAQs

Top tips for finding cheap flights from Denver to St. Charles

  • There is no airport in St. Charles. Instead, you’ll be flying into St. Louis Lambert Airport when flying between Denver and St. Charles.
  • The cheapest flight from Denver to St. Charles was found 48 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 November, December and January. The cheapest month to fly is September.
See more tips

Top 3 airlines serving Denver to St. Charles

 
Need help choosing which airline to fly with from Denver 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.
7.4
United AirlinesOverall score based on 10754 reviews
8.1Crew
7.7Boarding
6.7Food
7.2Comfort
7.1Entertainment
Airline reviews

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

8.0 ExcellentKeith, May 2024DEN - FAT
Read more about United Airlines reviews

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Flight delayed from Cape Town to Washington then got diverted to miami and in miami we had to fend for ourselves , im still trying to get to Shreveport now

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

Too many fees (but that seems to apply to all airlines nowadays)

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Everything was very good. Boarding and takeoff were on time and organized. Had a good flight

Wheelchair assistance was not complete. The person left me at the departure gate without informing the groundstaff of my requirements. I had to walk to the departure counter to ask for help to reach the plane door. The crew informed me that in future they were not allowed to help passengers like me, senior citizen and Wheelchair passenger with placing their carry on bags in the overhead compartments!

Flight was delayed by over an hour and gate checked bags took 15 minutes to be delivered to the jet bridge.

Seats are way too snug for my hip to knee ratio and the recline on the seat in front of me made my experience worst. My legs had no room at all. Not a plane for people 6 ft or over unless you fly first class.

Delayed for maintenance issue?? Should have been addressed before boarding. Put my bag on an earlier flight, but didn’t ask if I wanted to change to an earlier flight. Arrived to find my bag locked up and no agent to be found when I landed.

Nothing, terrible travel experience due to weather and maintenance delays and was left stranded in Austin.

My husband and I pre-ordered our food, but they did not have my husband’s order, and my cheese plate was very average. I asked for a blanket and was told they don’t carry blankets on domestic routs. The flight was on time and smooth!

28 hour delay at Fort Worth/Dallas airport, part due to weather which was unavoidable, but various other reasons - no pilot, no fa, mechanical problem, plane too small, too big, crew out of flying time, seat configuration problems.... endless and hourly updates with a different excuse. Finally told us about 3.00 am, that the flight was delayed to hours later.

Experience was bad. 3.5 hour delay for a 2.5 hour trip. There was no r Transparency about the reason for the delay and it was done 30 mins at a time.

The boarding process and flight were great. However, I waited about 40 minutes for my luggage. It did not come up on the designated belt. Instead, everyone’s bags were on a cart. Not sure what the issue was, but we were not informed until another passenger went looking for her bags and found them.

There were delays on both ends. It made it less than excellent. This plane was great though

AA1537 the AC was not working properly. It was very hot and uncomfortable.

Worst experience flying American Airlines. I fly with them often, so I was super disappointed in the service I received at gate 30 in LGA on May 24, mid-day. The flight was delayed twice. I was patiently waiting in the American Airlines lounge when I received the notice on my app that the plane was boarding 45 minutes before its newly re-scheduled take off of 4 pm (from the orginal 1:45 pm then 3:00 pm). It took me 5 min to travel from the lounge to the gate and when I arrived there at 3:20 flight gate attendant told me the flight had closed and that they announced for passengers multiple times. I showed them the notification on my app and they were really rude and unempathetic. The person who rescheduled my flight at customer service wasn't any happier but was at least helpful in getting me on the next flight.

Flight was 1/2 hour delayed leaving Phoenix. Otherwise it was an average flight. Flight crew on this trip was very nice.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Didn't like anything..entire crew was very rude to everyone on the flight. Plane old and the trays fall down on you the while time you're flying. Charged more for a carry on bag than for the plane ticket itself. Did make it from point a to point b, but worth the extra money to fly with another airline

My experience with frontier staff at the Denver airport was absolutely horrible. The manager on duty was even worst if was the worst experience I have ever had, I have never been treated so poorly as a customer in my life! The staff was extremely rude, eye rolls and attitude and then refusal to help me at all. I wish I could never fly frontier again that’s how horrible it was!

Fecal matter in seat back pocket. Presumably from a kids diaper.

I didn't get to do this flight l, hard to review

Not good 😐 Over priced baggage fees Small hard seats No wifi or entertainment options 😕

Left Denver late, then sat on tarmac 30 min after arrival

Everything was good, 20/30 minutes late waiting on a crew member. It’s hard to keep employees. Or serious employees I know. I remember one flight from Houston of Frontiers was almost 18 hours late. And another 4 hours late very poor. But I would rather be late and safe than the on the news. Thank you.

Bought seats on the flight and they were supposed to be 2 and a jumpseat. Plane clearly changed and it was a regular 3 seat row. Asked for a refund and was denied. If I wanted to sit next to someone else I wouldn't have bought the seats..

Lost baggage on my connecting flight. 24 hours later, still no update on my bags.

It’s a cheap airline and I wish if they had better seats.

Book cheap flights from Denver to St. Charles

Recent round-trip flight deals

6/12Wed
nonstopFrontier
2h 09mDEN-STL
6/19Wed
nonstopFrontier
2h 30mSTL-DEN
$56
6/13Thu
nonstopFrontier
2h 08mDEN-STL
6/18Tue
nonstopFrontier
2h 29mSTL-DEN
$61
8/13Tue
nonstopUnited Airlines
2h 09mDEN-STL
8/17Sat
1 stopUnited Airlines
6h 22mSTL-DEN
$142
7/1Mon
nonstop
2h 09mDEN-STL
7/5Fri
1 stop
8h 25mSTL-DEN
$172
7/9Tue
1 stopDelta
5h 21mDEN-STL
7/10Wed
1 stopDelta
8h 40mSTL-DEN
$176
6/28Fri
nonstop
2h 09mDEN-STL
7/5Fri
1 stop
8h 25mSTL-DEN
$182
7/30Tue
1 stopDelta
7h 51mDEN-STL
8/1Thu
1 stopDelta
5h 20mSTL-DEN
$186
8/23Fri
1 stopAmerican Airlines
7h 20mDEN-STL
8/28Wed
1 stopAmerican Airlines
8h 12mSTL-DEN
$195
6/21Fri
1 stopAmerican Airlines
7h 33mDEN-STL
6/24Mon
1 stopAmerican Airlines
6h 22mSTL-DEN
$253
8/13Tue
1 stopUnited Airlines
6h 55mDEN-STL
8/17Sat
2 stopsUnited Airlines
14h 26mSTL-DEN
$330

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Recent one-way flight deals

7/16Tue
nonstopFrontier
2h 06mDEN-STL
$32
7/3Wed
nonstopFrontier
2h 09mDEN-STL
$39
7/2Tue
1 stopDelta
5h 20mDEN-STL
$88
7/30Tue
nonstopUnited Airlines
2h 09mDEN-STL
$89
6/30Sun
1 stopDelta
7h 14mDEN-STL
$98
6/7Fri
1 stopSun Country Air
6h 13mDEN-STL
$101
6/6Thu
1 stopSun Country Air
20h 46mDEN-STL
$112
10/21Mon
nonstopUnited Airlines
2h 08mDEN-STL
$119
10/21Mon
1 stopAmerican Airlines
9h 05mDEN-STL
$132
6/14Fri
1 stopAmerican Airlines
7h 33mDEN-STL
$147

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Last minute flights from Denver to St. Charles

Last minute flight, train and bus deals

6/3Mon
multi-stopFrontier
9h 14mDEN-STL
6/10Mon
nonstopFrontier
2h 30mSTL-DEN
$125
6/2Sun
multi-stopFrontier
12h 26mDEN-STL
6/6Thu
nonstopFrontier
2h 29mSTL-DEN
$128
6/3Mon
nonstopSouthwest
2h 00mDEN-STL
6/7Fri
nonstopSouthwest
2h 15mSTL-DEN
$480
6/3Mon
multi-stopSouthwest
3h 55mDEN-STL
6/7Fri
nonstopSouthwest
2h 15mSTL-DEN
$485
6/5Wed
multi-stop
24h 20mDEN-STL
6/8Sat
multi-stop
22h 42mSTL-DEN
$488
6/6Thu
multi-stop
19h 05mDEN-STL
6/9Sun
multi-stop
23h 10mSTL-DEN
$495
6/2Sun
nonstopUnited Airlines
2h 09mDEN-STL
6/8Sat
nonstopUnited Airlines
2h 24mSTL-DEN
$532
6/4Tue
nonstopUnited Airlines
2h 04mDEN-STL
6/7Fri
nonstopUnited Airlines
2h 27mSTL-DEN
$552
6/3Mon
multi-stopAmerican Airlines
8h 54mDEN-STL
6/6Thu
multi-stopAmerican Airlines
7h 08mSTL-DEN
$588
6/3Mon
multi-stopAmerican Airlines
6h 12mDEN-STL
6/3Mon
multi-stopAmerican Airlines
5h 36mSTL-DEN
$631

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Flights to St. Charles