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Find cheap flights from Denver to St. Charles from $30

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 7/10. 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
Wed 7/10
Wed 7/17

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Good to know

Low season

January

High season

May

Cheapest flight

$30
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 Tuesday and avoid Saturdays 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 Thursdays.

  • 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 $30. Frontier offered a round-trip connection from $47 and United Airlines from $187.

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 10647 reviews
7.7Boarding
7.1Entertainment
8.1Crew
7.2Comfort
6.7Food
Airline reviews

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

2.0 MediocreAnonymous, Jun 2024DEN - MSN
Read more about United Airlines reviews

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

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.

This is by far the worst experience I have had with American Airlines. The start of this trip was a complete disaster. I purposely planned my trip so that I would weather any delays so that I could make very important meeting at the Pentagon. My flight was cancelled because of maintenance and I was put on the first flight the next day but I was late to the meeting. After a long week at the Pentagon I just wanted to go home and my flight home which was early in the day was delayed. Eventually the flight was delayed until the next day. I was not authorized a hotel room because DCA was my point of origin. So I paid for a hotel out of pocket. The flight this morning was boarded then deplaned because the aircraft was hot. The flow of information was not happening in DCA and made it worse when the news was bad. I am going to take a break from American for my next few military flights. Hopefully whatever has been going on with American Airlines will be resolved.

We had a 2 hour delay. The seats were smaller than most other airlines. The person in front of us wanted to lay back and we had to stop her because she was pressing against my girlfriend’s legs. We had to ask her to sit up and not lay back due to the lack of room.

Everything was fine once we actually got on our flight. It was more then annoying they canceled (delayed) our flight. We lost out on a day of our trip along with money on our stay. Plus we had to book another hotel. So expensive.

This flight was canceled and delayed several times without explanation. The plane was freezing cold and no wifi for messaging. Getting off the plane was terribly unorganized and felt like it took forever….

The flight was delayed several times without explanation. The seats were terribly uncomfortable and wifi isn’t included. All these make for a less than ideal flight.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

Internet service was erratic. Crew service was poor and slow. My luggage on this non-stop flight was lost and not recovered

Terrible. I didn’t fly and I had an important meeting the next day.

Equipment swap led to 2+ hour delay on international flight. And to top it off, boarding took forever.

Wretched scheduling - they got themselves into a critical crew situation and didn’t try to address it until 15 minutes before they had to cancel my flight

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

8/13Tue
nonstopFrontier
2h 06mDEN-STL
8/14Wed
nonstopFrontier
2h 28mSTL-DEN
$47
8/23Fri
nonstopFrontier
2h 11mDEN-STL
8/28Wed
nonstopFrontier
2h 28mSTL-DEN
$52
8/22Thu
nonstopUnited Airlines
2h 08mDEN-STL
8/25Sun
1 stopUnited Airlines
6h 32mSTL-DEN
$187
7/10Wed
1 stopUnited Airlines
5h 33mDEN-STL
7/16Tue
1 stopUnited Airlines
6h 22mSTL-DEN
$192
8/13Tue
1 stopAmerican Airlines
7h 20mDEN-STL
8/14Wed
1 stopAmerican Airlines
4h 47mSTL-DEN
$193
7/16Tue
1 stopDelta
7h 39mDEN-STL
7/23Tue
1 stopDelta
5h 20mSTL-DEN
$196
7/9Tue
1 stopAmerican Airlines
5h 07mDEN-STL
7/16Tue
1 stopAmerican Airlines
5h 07mSTL-DEN
$198
11/14Thu
1 stopSun Country Air
14h 46mDEN-STL
11/17Sun
1 stopSun Country Air
17h 17mSTL-DEN
$205
7/13Sat
1 stopDelta
7h 59mDEN-STL
7/16Tue
1 stopDelta
5h 20mSTL-DEN
$206
7/5Fri
1 stopSun Country Air
21h 30mDEN-STL
7/7Sun
1 stopSun Country Air
24h 19mSTL-DEN
$285

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Recent one-way flight deals

7/10Wed
nonstopFrontier
2h 10mDEN-STL
$30
8/12Mon
nonstopFrontier
2h 10mDEN-STL
$32
8/13Tue
1 stopDelta
7h 59mDEN-STL
$88
9/9Mon
nonstopUnited Airlines
2h 08mDEN-STL
$89
7/9Tue
1 stopDelta
5h 21mDEN-STL
$98
9/9Mon
1 stopAmerican Airlines
8h 25mDEN-STL
$99
8/9Fri
1 stopSun Country Air
6h 31mDEN-STL
$101
7/13Sat
1 stopSun Country Air
22h 59mDEN-STL
$123
9/8Sun
1 stopAmerican Airlines
8h 54mDEN-STL
$153
9/13Fri
2 stopsUnited Airlines
19h 38mDEN-STL
$248

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Last minute flights from Denver to St. Charles

Last minute flight, train and bus deals

6/15Sat
nonstopFrontier
2h 09mDEN-STL
6/18Tue
nonstopFrontier
2h 29mSTL-DEN
$156
6/12Wed
nonstopFrontier
2h 09mDEN-STL
6/19Wed
nonstopFrontier
2h 30mSTL-DEN
$168
6/13Thu
multi-stop
23h 39mDEN-STL
6/16Sun
multi-stop
14h 06mSTL-DEN
$530
6/13Thu
multi-stop
26h 25mDEN-STL
6/16Sun
multi-stop
14h 06mSTL-DEN
$559
6/14Fri
multi-stopDelta
7h 16mDEN-STL
6/16Sun
multi-stopDelta
8h 41mSTL-DEN
$606
6/15Sat
multi-stopAmerican Airlines
8h 54mDEN-STL
6/15Sat
multi-stopAmerican Airlines
5h 12mSTL-DEN
$633
6/12Wed
multi-stopAmerican Airlines
7h 01mDEN-STL
6/14Fri
multi-stopAmerican Airlines
5h 32mSTL-DEN
$638
6/15Sat
multi-stopUnited Airlines
5h 33mDEN-STL
6/16Sun
multi-stopUnited Airlines
11h 52mSTL-DEN
$746
6/13Thu
multi-stopDelta
7h 15mDEN-STL
6/15Sat
multi-stopDelta
5h 53mSTL-DEN
$786
6/15Sat
multi-stopUnited Airlines
5h 16mDEN-STL
6/15Sat
multi-stopUnited Airlines
21h 49mSTL-DEN
$795

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Flights to St. Charles