$28 Find Cheap Flights from Denver to Belleville

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 Belleville departing on 6/9. 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
$127
Typical prices: $358-$187
Frontier
Tue 5/26Tue 6/2
DEN - STL • Non-stop
Cheapest one-way
$28
Typical prices: $125-$266
Frontier
Tue 6/9
DEN - STL • Non-stop
Arrival airport
You can't fly directly to Belleville. It is served by St. Louis (STL), located 26.3 miles from Belleville.
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Denver to Belleville (DEN-STL)

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

Tue, May 26 - Tue, Jun 2
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
$127Frontier
Tue, Jun 2 - Wed, Jun 3
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
6:51 pm - 3:25 am
STL
-
DEN
9h 34m
1 stop
$130Frontier
Fri, May 22 - Tue, May 26
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
$131Frontier
Tue, Jun 2 - Wed, Jun 3
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
$132Frontier
Tue, May 26 - Mon, Jun 1
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
$133Frontier
Tue, Aug 11 - Mon, Aug 17
Frontier Logo
4:10 pm - 7:23 pm
DEN
-
STL
2h 13mnonstop
Frontier Logo
8:08 pm - 9:44 pm
STL
-
DEN
2h 36mnonstop
$134Frontier
Tue, Jun 2 - Thu, Jun 11
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
6:31 pm - 9:49 pm
STL
-
DEN
28h 18m
2 stops
$136Frontier
Tue, May 26 - Tue, Jun 2
Frontier Logo
7:00 am - 2:48 pm
DEN
-
STL
6h 48m
1 stop
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
$137Frontier
Wed, Jun 10 - Tue, Jun 16
Frontier Logo
12:47 pm - 2:06 pm
DEN
-
STL
24h 19m
1 stop
Frontier Logo
8:08 pm - 9:44 pm
STL
-
DEN
2h 36mnonstop
$138Frontier
Tue, Jun 2 - Wed, Jun 3
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
6:51 pm - 3:25 am
STL
-
DEN
9h 34m
1 stop
$139Frontier
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$28
Best time to beat the crowds with an average 34% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Denver to St. Louis

When to book flights from Denver to Belleville

Are your dates flexible? Find out the best times to travel from Denver to Belleville 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 Belleville

  • Which airports will I be using when flying from Denver to Belleville?

    When flying out of Denver you’ll be using Denver Intl. Belleville does not have its own airport so you’ll be flying into nearby Lambert-St Louis airport, which is 26.3 mi away.

  • How long does a flight from Denver to Belleville take?

    Direct flights cover the 767 miles separating Denver and Belleville in about 2h 00m.

  • How many flights are there between Denver and Belleville?

    26 direct flights run between Denver and Belleville on a daily basis. On average, there are about 183 departures each week.

  • What’s the cheapest day of the week to fly between Denver and Belleville?

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

  • How does KAYAK find such low prices on flights from Denver to Belleville?

    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 Belleville.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Belleville 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 Belleville?

    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 Belleville 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 Belleville?

    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 Belleville 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 Belleville?

    In the last 72 hours, the cheapest one-way ticket between Denver and Belleville found on KAYAK was with Frontier for $29. Frontier offered a round-trip connection from $58 and United Airlines from $176.

Top tips for finding cheap flights from Denver to Belleville

  • There is no airport in Belleville. Instead, you’ll be flying into St. Louis Lambert Airport when flying between Denver and Belleville.
  • The cheapest flight from Denver to Belleville was found 51 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 February, March and April. The cheapest month to fly is January.

Reviews of the top 3 airlines serving Denver to Belleville

 
Need help choosing which airline to fly with from Denver to Belleville? 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.
7.9
SouthwestOverall score based on 4301 reviews
7.5Entertainment
8.1Boarding
8.6Crew
8.0Comfort
7.0Food
Airline reviews

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

4.0 OkayCrystal, Apr 2026
MSY - MDW
Read more Southwest reviews

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

For the first time in a long time, the Wi-Fi actually worked the entire flight! The flight crew was amazing as usual.

Great flight. I didn't get a drink because I was asleep whole on the flight.

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.

WiFi was not working and didn’t have a beverage service

My flight from Denver to Minneapolis was excellent. My flight from Minneapolis to Denver was one of the worst I flights I have ever experienced. I had a window seat, the gentleman in the middle seat was morbidly obese and SW should have made him purchase two seats. His elbow dug into my arm most of the way even after I asked to please be careful. I was literally squashed between the him and the window with no wiggle room. The plane was full so it was not possible to ask for a different seat. I realize I should have complained to the flight attendant but I didn't feel anything could be done to rectify the situation. I fly SW often, I will continue to do so as this was my first negative experience.

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

Everything went smoothly and we even arrived a little bit early.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Really hard landing... as in slammed into the runway then hit the brakes really hard ...

Every staff member was professional, friendly and courteous. The pizza twist was ok. It was warm but too much dough.

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

Flight left on time and we arrived 25 minutes early! There was a gate available when we arrived so early on a busy Sunday afternoon! Flight attendants came around twice with the drinks cart.

Sitting on the runway after we land for almost two hours! Not sure if we should blame United or Just Dumpy Vance.

Flight was late - I was downgraded from first class to coach

Crew seemed a bit cranky. No seatback screens. But boarding was efficient and on time and we arrived early.

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

The staff at the check in counter was so rude. Made you feel Incompetent

Frontier scheduled a 40 minute connection in DEN. What they failed to mention was that they “close the doors” 20 mins prior to departure, which means you only have 20 mins. Not enough time. Possibly against DOT regulations. Filing complaint.

Flight was scheduled at 9:40pm. Got delayed to 10 am, the next day. crazy

The bag check, flight check-in, and onboard experience convinced my wife and me that we will actively go out of our way to avoid flying Frontier Airlines in the future. At bag check, we were informed that check-in could only be completed via the Frontier mobile app. Unfortunately, the app was extremely frustrating—sending us through repetitive, confusing loops that repeatedly forced us to decline add-on services with nearly every click. While most airline apps upsell, this one felt intentionally exhausting. As the process dragged on, we became genuinely concerned that my phone battery would die before check-in could be completed. We approached the bag check staff—who were standing together talking—and explained both our frustration and our predicament. They laughed. Later, my wife described the interaction as “gaslighting,” which felt accurate. We were then informed it would cost $25 per person simply to have our boarding passes printed. From that point forward, the tone of the experience was consistently hostile. The bag check employees were condescending and combative, behaving more like bullies than customer service staff. Unfortunately, that same attitude continued onboard. One flight attendant argued with me when I attempted to stow my backpack in the overhead bin. I explained that we had each paid $75 to check our bags specifically so we would not need to use carry-on space and could have adequate legroom. She demanded to see my ticket, pointed out that it said “no carry-on”—which I acknowledged—and I reiterated that this was precisely why we paid to check our bags. Her response was, “I don’t make the rules.” She then walked away, but not before asking if I “truly wanted to fly back to Chicago today?”—an unnecessary and unmistakable threat. It is also worth noting that despite booking our tickets together in the same transaction, we were not seated together. Upon our return to Chicago—where we could once again sit together—we compared onboard experiences. We both remarked on how unhappy the flight attendants appeared and how each of us was separately asked whether we would like to purchase a beverage. We declined. At no point was water mentioned as an option, leaving us with the clear impression that even water came at a cost—or that complimentary water, if available at all, was deliberately left unmentioned. Overall, the experience was shocking and deeply disappointing, but it was also a profound learning experience—one we will not forget and will not repeat. -Steve

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

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.

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!!

Everything you need to know for your flight from Denver to Belleville

Complete your trip to Belleville with a hotel stay or car rental