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Find cheap flights from Denver to St. Charles from $39

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 7/3. 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
Thu 6/27
Thu 7/4

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Good to know

Low season

January

High season

May

Cheapest flight

$39
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 Thursdays if you are looking for the best rates. For your return to Denver, you’ll find the best rates on Saturdays 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 $39. Frontier offered a round-trip connection from $81 and Delta from $196.

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 10799 reviews
7.7Boarding
6.7Food
7.1Entertainment
7.2Comfort
8.1Crew
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.

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

Was lucky to have a employee at the AA checkin counter that had compassion and understood they ordeal that we went through with our original flight being diverted, needing to stay in the aircraft and then flying to the original destination; adding hours to the trip and forcing us to miss our connection and our rebooked connection. She was able to get up on standby on the highest priority on the next flight to the closest airport we need to be at and it all worked out despite being many hours late.

Delayed so that missed connecting flight. Connecting flight was also delayed on the tarmac but they closed the gate before the rescheduled time.

Attendants were rude. Scowling. Seats were miserable and we paid extra.

Took off over an hour late with multiple mechanical issues. Gate agent in Dallas was lazy and was slow as molasses. Had a line 10 people long. Spirit bad..

The flight was short. However, my bag was delayed and was put on another flight.

Flight attendant was incredible. Very efficient, friendly and pleasant. Patricia was one of the best I have ever seen. Please give her a big raise!

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.

Seats are cramped and uncomfortable. You have to pay for everything and it is very expensive.

Book cheap flights from Denver to St. Charles

Recent round-trip flight deals

7/17Wed
nonstopFrontier
2h 10mDEN-STL
7/17Wed
nonstopFrontier
2h 28mSTL-DEN
$81
7/24Wed
nonstopFrontier
2h 10mDEN-STL
7/31Wed
nonstopFrontier
2h 23mSTL-DEN
$86
7/4Thu
1 stop
14h 39mDEN-STL
7/6Sat
nonstop
2h 23mSTL-DEN
$167
6/9Sun
1 stop
6h 00mDEN-STL
6/18Tue
nonstop
2h 29mSTL-DEN
$192
6/26Wed
1 stopDelta
7h 33mDEN-STL
7/3Wed
1 stopDelta
8h 41mSTL-DEN
$196
7/23Tue
1 stopDelta
5h 21mDEN-STL
8/2Fri
1 stopDelta
5h 20mSTL-DEN
$216
6/14Fri
1 stopAmerican Airlines
7h 33mDEN-STL
6/15Sat
1 stopAmerican Airlines
6h 30mSTL-DEN
$273
6/14Fri
1 stopAmerican Airlines
7h 33mDEN-STL
6/16Sun
1 stopAmerican Airlines
7h 55mSTL-DEN
$295
10/25Fri
1 stopUnited Airlines
7h 13mDEN-STL
10/28Mon
nonstopUnited Airlines
2h 31mSTL-DEN
$317
7/20Sat
1 stopUnited Airlines
7h 26mDEN-STL
7/23Tue
2 stopsUnited Airlines
14h 26mSTL-DEN
$386

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Recent one-way flight deals

7/3Wed
nonstopFrontier
2h 09mDEN-STL
$39
6/19Wed
nonstopFrontier
2h 09mDEN-STL
$40
6/26Wed
1 stopDelta
7h 33mDEN-STL
$98
7/4Thu
1 stopSun Country Air
14h 39mDEN-STL
$101
6/19Wed
1 stopAmerican Airlines
7h 34mDEN-STL
$107
6/13Thu
1 stopSun Country Air
17h 21mDEN-STL
$108
6/30Sun
nonstopUnited Airlines
2h 09mDEN-STL
$109
8/12Mon
1 stopAmerican Airlines
7h 20mDEN-STL
$117
6/28Fri
1 stopDelta
7h 33mDEN-STL
$118
7/20Sat
1 stopUnited Airlines
5h 51mDEN-STL
$124

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Last minute flights from Denver to St. Charles

Last minute flight, train and bus deals

6/2Sun
multi-stopFrontier
30h 01mDEN-STL
6/10Mon
nonstopFrontier
2h 30mSTL-DEN
$177
6/1Sat
multi-stopFrontier
15h 45mDEN-STL
6/5Wed
nonstopFrontier
2h 30mSTL-DEN
$227
5/30Thu
multi-stopDelta
7h 24mDEN-STL
6/4Tue
multi-stopDelta
5h 44mSTL-DEN
$576
5/30Thu
multi-stopDelta
7h 24mDEN-STL
6/3Mon
multi-stopDelta
5h 39mSTL-DEN
$596
5/31Fri
multi-stopUnited Airlines
12h 40mDEN-STL
6/3Mon
multi-stopUnited Airlines
6h 44mSTL-DEN
$621
5/29Wed
multi-stopAmerican Airlines
6h 12mDEN-STL
5/29Wed
multi-stopAmerican Airlines
4h 42mSTL-DEN
$631
5/29Wed
multi-stopUnited Airlines
5h 14mDEN-STL
5/30Thu
multi-stopUnited Airlines
6h 55mSTL-DEN
$876
5/29Wed
multi-stopAmerican Airlines
8h 33mDEN-STL
5/29Wed
multi-stopAmerican Airlines
5h 36mSTL-DEN
$939
5/31Fri
multi-stopAlaska Airlines
29h 22mDEN-STL
6/2Sun
multi-stopAlaska Airlines
27h 56mSTL-DEN
$945
5/29Wed
multi-stopAlaska Airlines
18h 59mDEN-STL
5/30Thu
multi-stopAlaska Airlines
21h 56mSTL-DEN
$988

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Flights to St. Charles