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$36 Find cheap flights from Denver to Illinois

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 Illinois departing on 8/14. 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 7/18
Thu 7/25

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Best Illinois Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Chicago
Chicagononstop$47
Moline
Moline1 stop$208
Peoria
Peorianonstop$116
Bloomington
Bloomingtonnonstop$118
Champaign
Champaign1 stop$421
Springfield
Springfield1 stop$366
Decatur
Decatur1 stop$384
St. Louis
St. Louisnonstop$48

Good to know

Low season

January

High season

June

Cheapest flight

$36
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 13% increase in price.
Flight from Denver to Chicago O'Hare Airport

FAQs - booking Illinois flights

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

    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 Illinois.

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

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

    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 Illinois 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 Illinois?

    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 Illinois from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Denver to the following destinations at these prices or less: Chicago $119 one-way - $225 round-trip
  • Morning departure is around 35% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from Denver to Illinois

Need help choosing which airline to fly with from Denver to Illinois? 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
DeltaOverall score based on 10000 reviews
8.6Crew
7.4Food
8.2Boarding
8.0Entertainment
7.9Comfort
Airline reviews

The fight was about 2 1/2 hours delayed, but that was weather related. The flight was also overbooked. But we were in Comfort plus so the flight was fine for us.

10.0 ExcellentBarb, Jun 2024JFK - MSP
Read more about Delta reviews

The fight was about 2 1/2 hours delayed, but that was weather related. The flight was also overbooked. But we were in Comfort plus so the flight was fine for us.

Meh. A late flight meant I missed my connections, and a 2pm LAX arrival turned into gettin in after midnight.

Flight was 3 hours late so only had an OK experience

It was very cold because the air conditioner was on high power, and my son got sick.

3 hours late and all they have is was a $12 meal voucher. That’s not even enough to cover fast food.

Among the poorest flights I’ve had with Delta in a while. Entertainment system failed completely on a 7.5 hr flight. Crew seemed distracted and not the normal friendly crew. Flight overbooked it seemed… very crowded.

If I can, I always fly Delta. I’ve found their service to always be reliable and pleasant.

You could have not cancelled the flight (AA, which I will be flying from now on) left for BOS despite the fictitious weather issues (that no one in my Boston family could see). You could have rebooked my direct flight to another direct flight instead of sending me though JFK, the worst US airport after O’Hara You could have rebooked me on a Main Cabin seat (like the one I paid for in my original ticket instead of putting me a the last row on JFK->BOS leg, pocketing the difference in ticket price But I do not really care whether you will ever do that in a future because in a future neither I nor anyone from my company (unless they pay out of pocket) nor an of my clients and partners (if they heed my advice) will ever be caught dead on any of Delta flights

Really bad baggage handling. Had my Rimowa bag badly damaged at the latches.

It was pretty good I was worried with the short Layover that I might not catch my connection but the gate was there

They put me on a chair in between two men, one overweight who was almost falling on top of me, and the other was even uncomfortable because I was half falling because of what the other was pushing me. I stayed with. my feet were swollen from fluid retention and from being unable to accommodate myself. it was very uncomfortable. I asked for help but they told me that the flight was full and they couldn't help me. I got off the plane almost unable to walk due to the inflammation. and then at FLL airport I asked for help because I couldn't go to my next flight, which was a connection.

The walk from baggage claim to the taxi is very difficult for older people I will never fly into JFK again. It is physically challenging

Overall fine but both ways for this trip was delayed.

Flight was delayed by almost 5 hours. Suitcase was not loaded despite the flight being near empty (my colleagues’ suitcases did reach JFK, unlike mine). Had to argue on phone to get JetBlue to deliver the case to my hotel. Never again

The flight was excellent. The crew was welcoming and attentive.

Great! I love Jet Blue. My favorite airline! Very efficient, clean and timely.

Run out of snack choices. Why are the seats not padded for your butt? Are we sitting on blocks of wood or metal for $250-300 a pop? This ain’t spirit. Let’s get it together people

We were told that our flight would be delayed for 90+ minutes because of weather, so we went to get something to eat only to have them randomly start boarding 15 minutes after the announcement, with no warning.

Entertainment... No earphones passed out. Many including me couldn't use the TV. Legroom was good. Crew was indifferent and a bit surly. Free wifi was a nice convenience. Check in desk location was unknown. Gate number on the boarding passes was wrong.

Going through JFK’s security is a mess. The TSA security said no shoes on the bins. So, we place our shoes in the belt and they came out all over the belt. Boarding was delayed and Flight as well.

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.

Our flight was delayed by 18 hours. Poor accommodations made and no apology.

This flight was awful all around. Delays on the tarmac at PHL before takeoff and at the tarmac in Chicago caused me to miss my final connection. This was completely avoidable, in my opinion.

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

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

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

Flight was fine. It took an unusually long time to have baggage delivered to the carousel in ORD.

Average - flew with Jet Blue internal and it was far more comfortable and better food and entertainment. Notable difference

The flight got canceled due to mechanical issues, and he to be rebooked and missed my appointments for that day

Did not realize seats did not recline. Best to travel in an exit row... No question

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.

Book cheap flights from Denver to Illinois

Recent round-trip flight deals

8/6Tue
nonstopFrontier
2h 35mDEN-ORD
8/28Wed
nonstopFrontier
2h 44mORD-DEN
$47
9/21Sat
nonstopFrontier
2h 31mDEN-ORD
9/24Tue
nonstopFrontier
2h 45mORD-DEN
$48
9/11Wed
nonstopFrontier
2h 11mDEN-STL
9/14Sat
nonstopFrontier
2h 28mSTL-DEN
$48
7/2Tue
nonstopUnited Airlines
2h 31mDEN-ORD
7/5Fri
nonstopUnited Airlines
2h 43mORD-DEN
$97
8/9Fri
nonstopUnited Airlines
2h 31mDEN-ORD
8/12Mon
nonstopUnited Airlines
2h 44mORD-DEN
$152
7/16Tue
1 stopDelta
7h 20mDEN-STL
7/23Tue
1 stopDelta
5h 34mSTL-DEN
$176
7/17Wed
1 stopDelta
7h 20mDEN-STL
7/24Wed
1 stopDelta
5h 20mSTL-DEN
$186
7/9Tue
nonstopAmerican Airlines
2h 37mDEN-ORD
7/9Tue
nonstopAmerican Airlines
2h 37mORD-DEN
$199
11/13Wed
nonstopAmerican Airlines
2h 29mDEN-ORD
11/16Sat
1 stopAmerican Airlines
6h 36mORD-DEN
$201
9/11Wed
2 stopsAlaska Airlines
24h 23mDEN-STL
9/14Sat
1 stopAlaska Airlines
8h 03mSTL-DEN
$397

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Recent one-way flight deals

8/14Wed
nonstopFrontier
2h 36mDEN-ORD
$36
8/28Wed
nonstopFrontier
2h 22mDEN-MDW
$36
7/16Tue
nonstopUnited Airlines
2h 09mDEN-STL
$75
7/16Tue
1 stopAmerican Airlines
7h 31mDEN-STL
$84
7/15Mon
1 stopDelta
7h 07mDEN-STL
$88
7/16Tue
1 stopDelta
5h 55mDEN-ORD
$98
7/4Thu
1 stopAmerican Airlines
6h 07mDEN-PIA
$99
8/19Mon
1 stopUnited Airlines
5h 41mDEN-ORD
$122
11/10Sun
2 stopsAlaska Airlines
21h 57mDEN-ORD
$169
7/16Tue
2 stopsAlaska Airlines
15h 55mDEN-STL
$192

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Last minute flights from Denver to Illinois

Last minute flight, train and bus deals

6/21Fri
nonstopFrontier
2h 35mDEN-ORD
7/1Mon
nonstopFrontier
2h 57mORD-DEN
$187
6/23Sun
nonstopFrontier
2h 30mDEN-ORD
6/27Thu
nonstopFrontier
2h 45mORD-DEN
$197
6/21Fri
multi-stopAmerican Airlines
5h 10mDEN-MLI
6/25Tue
multi-stopAmerican Airlines
7h 12mMLI-DEN
$258
6/23Sun
multi-stopDelta
5h 52mDEN-ORD
7/4Thu
multi-stopDelta
9h 19mORD-DEN
$276
6/23Sun
multi-stopDelta
5h 52mDEN-ORD
6/24Mon
multi-stopDelta
7h 14mORD-DEN
$356
6/21Fri
multi-stopUnited Airlines
4h 58mDEN-MLI
6/25Tue
nonstopUnited Airlines
2h 27mMLI-DEN
$414
6/19Wed
nonstopUnited Airlines
2h 35mDEN-ORD
6/19Wed
nonstopUnited Airlines
2h 47mORD-DEN
$452
6/19Wed
nonstopAmerican Airlines
2h 34mDEN-ORD
6/19Wed
multi-stopAmerican Airlines
5h 27mORD-DEN
$467
6/23Sun
multi-stopAlaska Airlines
28h 01mDEN-STL
7/23Tue
multi-stopAlaska Airlines
24h 47mSTL-DEN
$748
6/21Fri
multi-stopAlaska Airlines
26h 34mDEN-STL
6/23Sun
multi-stopAlaska Airlines
16h 30mSTL-DEN
$956

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Denver - Illinois Flights

Departure:

Denver (DEN)United States

Return flight deals:

Illinois - Denver

Cabin classes:

$443
$753
$671
$57