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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 6/5. 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
Sun 6/9
Sun 6/16

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Good to know

Low season

January

High season

April

Cheapest flight

$39
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 7% increase in price.
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 04m.

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

    22 direct flights run between Denver and St. Charles on a daily basis. On average, there are about 159 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 Mondays.

  • 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 $67 and Sun Country Air from $185.

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 11016 reviews
7.2Comfort
7.1Entertainment
6.7Food
8.1Crew
7.7Boarding
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.

Worst situation ever! I booked my tickets for this trip on Alaska Airlines. I guess AA is a partner and we flew nonstop from Eugene to PHX on an AA jet. I had to pay for luggage from PHX to EUG. And this was an Alaska Airlines reservation paid for with Alaska airlines credit card! Got to the PHX airport and was not able to check bags because of some weird issue with the AA software. My reservation had to be the-entered by the agent. I will never pick another American Airlines flight on the Alaska Airlines website. While on vacation, I tried to upgrade our seats for the trip home. The request just buffered and never went through. I tried four times and was charged four times on my credit card. The card was charged but the seats were never changed. What a wreck!

Left from gate 30 minutes before flight. Never been late to a flight ever. It says 15 minutes before explicitly on the ticket.

I like the boarding process, it was fast. The seat doesn’t have a TV for a long flight and food wasn’t served, just snacks.

Use planes with TVs on flights over 4 hours. The free entertainment was a cheap in between solution for a very long flight that you don't even bother providing meals or decent snacks.

Even though we left CMI late, we mostly made up the time.

Delayed almost 4 hours for a 45 minute flight with no explanation.

Again, multiple delays and I eventually just canceled and drove!

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Horrible - they lied to me about baggage & boarding, even though I specifically spoke to their agents the day before my flight about my issue. When I showed up they did not let me board and stranded me at my airport until I bought a new flight with money I did not have to spend.

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.

For a busy travel season, everything was clearly marked, correct, and smooth. My favorite travel description is “UNEVENTFUL,” and this trip met the mark!

The flight and crew were fine. When we (several groups) arrived in Norfolk on Sunday we discovered our bags had not arrived. The staff at norfolk airport was less than helpful. Told us our bags wouldn't arrive until Thursday. When asked what happened they said it bags never made it on the plane and it happened all the time. When asked about reimbursement for replacement items the desk agent said we could try to submit receipts online, but they weren't sure we would be reimbursed. I understand this is a low cost airline, but this was really beyond poor customer service.

Book cheap flights from Denver to St. Charles

Recent round-trip flight deals

5/29Wed
nonstopFrontier
2h 10mDEN-STL
6/4Tue
nonstopFrontier
2h 36mSTL-DEN
$67
7/30Tue
nonstopFrontier
2h 06mDEN-STL
8/1Thu
nonstopFrontier
2h 24mSTL-DEN
$76
8/8Thu
1 stop
22h 02mDEN-STL
8/11Sun
nonstop
2h 24mSTL-DEN
$178
5/23Thu
nonstop
2h 12mDEN-STL
5/26Sun
1 stop
15h 40mSTL-DEN
$180
5/24Fri
1 stopSun Country Air
24h 00mDEN-STL
5/26Sun
1 stopSun Country Air
15h 40mSTL-DEN
$185
7/9Tue
1 stopAmerican Airlines
5h 04mDEN-STL
7/9Tue
1 stopAmerican Airlines
8h 14mSTL-DEN
$191
7/9Tue
1 stopAmerican Airlines
7h 31mDEN-STL
7/13Sat
1 stopAmerican Airlines
6h 33mSTL-DEN
$205
6/13Thu
1 stopSun Country Air
17h 21mDEN-STL
6/16Sun
1 stopSun Country Air
14h 06mSTL-DEN
$240
5/17Fri
1 stopUnited Airlines
7h 23mDEN-STL
5/21Tue
nonstopUnited Airlines
2h 25mSTL-DEN
$326
7/9Tue
2 stopsUnited Airlines
11h 02mDEN-STL
7/13Sat
1 stopUnited Airlines
6h 22mSTL-DEN
$374

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Recent one-way flight deals

6/5Wed
nonstopFrontier
2h 09mDEN-STL
$39
5/31Fri
nonstopFrontier
2h 10mDEN-STL
$49
8/9Fri
1 stopSun Country Air
6h 31mDEN-STL
$91
7/8Mon
1 stopDelta
7h 11mDEN-STL
$98
8/9Fri
1 stopSun Country Air
6h 31mDEN-STL
$113
9/9Mon
1 stopAmerican Airlines
6h 03mDEN-STL
$114
6/10Mon
1 stopAmerican Airlines
7h 34mDEN-STL
$117
5/31Fri
1 stopDelta
5h 36mDEN-STL
$118
7/9Tue
2 stopsUnited Airlines
11h 02mDEN-STL
$252
7/9Tue
2 stopsUnited Airlines
17h 39mDEN-STL
$258

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Last minute flights from Denver to St. Charles

Last minute flight, train and bus deals

5/15Wed
nonstopFrontier
2h 06mDEN-STL
5/25Sat
nonstopFrontier
2h 31mSTL-DEN
$127
5/11Sat
nonstopFrontier
2h 06mDEN-STL
5/15Wed
nonstopFrontier
2h 31mSTL-DEN
$278
5/15Wed
multi-stopDelta
7h 24mDEN-STL
5/18Sat
multi-stopDelta
8h 44mSTL-DEN
$367
5/15Wed
multi-stopDelta
7h 24mDEN-STL
5/20Mon
multi-stopDelta
5h 24mSTL-DEN
$387
5/15Wed
multi-stopUnited Airlines
5h 16mDEN-STL
5/25Sat
multi-stopUnited Airlines
5h 23mSTL-DEN
$461
5/11Sat
nonstopUnited Airlines
2h 00mDEN-STL
5/17Fri
multi-stopUnited Airlines
6h 54mSTL-DEN
$471
5/11Sat
multi-stopAmerican Airlines
6h 16mDEN-STL
5/16Thu
multi-stopAmerican Airlines
5h 22mSTL-DEN
$515
5/12Sun
multi-stopAmerican Airlines
8h 54mDEN-STL
5/13Mon
multi-stopAmerican Airlines
7h 43mSTL-DEN
$619
5/11Sat
multi-stopAlaska Airlines
27h 46mDEN-STL
5/17Fri
multi-stopAlaska Airlines
24h 30mSTL-DEN
$687
5/12Sun
multi-stopAlaska Airlines
29h 27mDEN-STL
5/17Fri
multi-stopAlaska Airlines
24h 30mSTL-DEN
$720

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Flights to St. Charles