$43 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 4/3. 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
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$107
Overall average: $299
Frontier
Wed 4/1Mon 4/6
DEN - STL • Non-stop
Cheapest one-way
$43
Typical prices: $110-$193
Frontier
Fri 4/3
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

Wed, Apr 1 - Mon, Apr 6
Frontier Logo
6:40 am - 9:48 am
DEN
-
STL
2h 08mnonstop
Frontier Logo
8:19 pm - 9:52 pm
STL
-
DEN
2h 33mnonstop
$107Frontier
Thu, Apr 16 - Thu, Apr 23
Frontier Logo
4:09 pm - 7:21 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
8:06 pm - 9:39 pm
STL
-
DEN
2h 33mnonstop
$111Frontier
Sat, May 2 - Wed, May 6
Frontier Logo
4:20 pm - 7:32 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
6:51 pm - 3:25 am
STL
-
DEN
9h 34m
1 stop
$113Frontier
Sat, Apr 18 - Mon, Apr 20
Frontier Logo
4:20 pm - 7:32 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
9:55 pm - 3:59 am
STL
-
DEN
7h 04m
1 stop
$114Frontier
Tue, May 5 - Sat, May 9
Frontier Logo
11:54 pm - 8:55 am
DEN
-
STL
8h 01m
1 stop
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
$115Frontier
Fri, May 1 - Mon, May 4
Frontier Logo
4:09 pm - 7:21 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
8:17 pm - 9:50 pm
STL
-
DEN
2h 33mnonstop
$120Frontier
Fri, Apr 10 - Mon, Apr 13
Frontier Logo
6:40 am - 9:48 am
DEN
-
STL
2h 08mnonstop
Frontier Logo
8:19 pm - 9:52 pm
STL
-
DEN
2h 33mnonstop
$121Frontier
Fri, Apr 10 - Mon, Apr 13
Frontier Logo
5:53 pm - 11:25 pm
DEN
-
STL
28h 32m
1 stop
Frontier Logo
8:19 pm - 9:52 pm
STL
-
DEN
2h 33mnonstop
$125Frontier
Mon, May 4 - Wed, May 6
Frontier Logo
4:20 pm - 7:32 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
6:51 pm - 3:25 am
STL
-
DEN
9h 34m
1 stop
$126Frontier
Sun, Apr 26 - Mon, Apr 27
Frontier Logo
4:09 pm - 7:21 pm
DEN
-
STL
2h 12mnonstop
Frontier Logo
8:17 pm - 9:50 pm
STL
-
DEN
2h 33mnonstop
$127Frontier
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$43
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly with an average 12% 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?

    19 direct flights run between Denver and Belleville on a daily basis. On average, there are about 137 departures each week.

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

    Consider leaving on a Friday and avoid Mondays 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 $59 and United Airlines from $169.

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 71 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 May, June and July. 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.
8.0
SouthwestOverall score based on 4324 reviews
8.6Crew
8.0Comfort
7.5Entertainment
8.1Boarding
7.0Food
Airline reviews

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

8.0 ExcellentNick, Mar 2026
BOS - MDW
Read more Southwest reviews

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.

The seats were comfortable, and the boarding process was pretty smooth.

It was rough. The staff was unprofessional, the choice of on board drinks terrible, it was cramped in space at every airport, they always ran out of overhead bin space so they pressured people to check bags for free or we couldn’t leave on the plane— so I did check my bag to help, and they nearly lost my bag. My bag did not arrive on the luggage belt, another man on my flight and I had to waste our time going to the baggage office to search for our bags. I would only fly southwest again if it was my last choice. Also, my flights were consistently delayed over and over again— at one point they straight up told us we were waiting for the pilot to arrive.

Connecting flight is on time and boarding was a breeze!

Excellent. Would encourage Southwest to keep current boarding procedures with free style seating. Makes for a fantastic experience

WiFi did not work. For as outrageous as these flights cost, when they’re advertised with certain services/ features they should be in working order

Worst experience I had on Southwest. Still better than most, but the seating was barely tolerable.

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.

Terrible. They wouldn't allow me on my flight on the 14th..

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

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!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

This company socks. It's fraud. They canceled our flight yesterday, and today we were late because of a really long line at the check in bag. At the rebook station, there was ton of people. The workers were all rude. I am gonna make a report to FTC.

Not clean and was told I would get a great seat and it was not great at all

Delayed. Text notifications were slow. Not much information o what was happening. Boarding was slow and confusing. Wasn’t even offered water other flight. Had to ask. No entertainment at all. Felt like.a Greyhound bus.

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

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