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Find cheap flights from Denver to Illinois from $36

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 6/1. 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
sex 6/14
sex 6/21

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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$57
Moline
Moline1 stop$272
Peoria
Peorianonstop$116
Bloomington
Bloomingtonnonstop$178
Champaign
Champaign1 stop$356
Springfield
Springfield1 stop$316
Decatur
Decatur1 stop$305
St. Louis
St. Louisnonstop$57

Good to know

Low season

January

High season

May

Cheapest flight

$36
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly and prices are also 29% lower on average.
Flight from Denver to St. Louis

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 $107 one-way - $224 round-trip
  • Morning departure is around 23% 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 10691 reviews
7.4Food
8.0Entertainment
8.2Boarding
7.9Comfort
8.6Crew
Airline reviews

Absolutely nothing flight was cancelled and delayed for 2 days. Barely a heads up I want a full refund

2.0 MediocreDevan, May 2024AUS - BOS
Read more about Delta reviews

Absolutely nothing flight was cancelled and delayed for 2 days. Barely a heads up I want a full refund

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Best airline! Always friendly and welcoming. Skyclub was great and loved the fast free wifi on board. I also love that you can pre-order your meal on the app!

Atlanta boarding crew at gate were filled with arrogance and were disrespectful. In flight crew showed indifference to the needs of passengers. This is about the flight from ATL to BDL.

Boarding was somewhat chaotic. Unable to evaluate crew or food/drink because captain kept them seated due to turbulence. Have no idea if entertainment was offered.

The gate area was incredibly short staffed, with one representative manning 4-5 flights, which caused a 3 hr delay in boarding even though the plane was all ready to leave. Other flights also were delayed because of this. The flight crew was awesome and I feel bad for the only gate worker on call, but Delta needs to hire more employees.

Very frustrated with boarding gate crew. She announced the plane was small and they would be limiting us to one item to carry on. Not a problem for me as I understand the tiny planes have limited space!! Not the case here! It was a rather large plane and had plenty of room for bags! So because I don’t want to be one of “those people” who ignores the request to check a carry on I did so asking if I would be able to pick it up at the bottom of the ramp on arrival in Knoxville to which she responded “yes”! Then I watched as every other passenger held onto their 2 items and boarded!! Then when we arrived in Knoxville our 2 carry ons had been put with all the other luggage and we had to go to baggage pick up and wait for all the big checked bags to come off the carousel! So she lied!! Frustrating. Next time I won’t be so nice!

It was a good experience except when boarding a female flight attendant did not go out of her way to assist my teenage daughters in finding space for their carry-ons after their compartments were full.

On time departure, smooth trip, flight attendant told through passengers the gate we would arrive at and the gate our outbound flight was departing from. Early arrival

Checking in at the airport the agent only booked the first keg of my trip and had my checked luggage going to the airport with a layover! Never was issued a boarding pass for the second leg or received sticker fir my checked bag. All was well in the end! Delta agents helped to resolve the situation!!!

Delayed departure. Delayed after landing pulling into gate. Delay due to sky bridge malfunction

Great. Loved that there was WiFi on flight to keep in touch and excellent service of beverages and snacks.

Business class is great. New airplane, very comfortable, better than some of the major airlines I am used to

Terrible. Flight was cancelled due to the weather in the east and sout east(florida). Did not get any compesation of any kind. According to them, it was not under their control so I lost all the money paid for the 2 fairs from Raleigh, NC to Orlando, Fl.

great flight. Pilot was communicative, flight attendants were excellent. Really nice experience except my tv didn’t work.

Overall, the flight was better than the flight I took to go to Florida, which had a bunch of problems. The crew is really nice and the plane was new so it had a small problem when we were on the runway, but the flight itself was great. They even made some time back up, which is always a good thing.

There were multiple delays but JetBlue tried to make the boarding and departure process as quick and efficient as possible. The crew was as detached from reality as could be, meaning: not very friendly and just doing things by the numbers.

I had back trouble prior to my flight and everyone was great about helping me.

40 minute delay before take off after boarding flight. Bright lights throughout night flight due Issues with light panels. In flight Entertainment nonfunctional

Everything was good except for deplaning in NY. Took way too long!!

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.

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

The flight was scheduled to depart DCA at 12:30 pm but was delayed twice on the ground so that we were finally scheduled to depart at around 4:00 pm. Once we boarded, it was announced that takeoff would be delayed again to fix a hydraulic problem which delayed our eventual takeoff until around 5:00 pm. Once we departed, it was a smooth flight back to ORD. We did not get any explanation about what caused the original significant delay. In my experience, this happens frequently with AA.

The only problem experienced was a ground stop in Chicago due to weather. But the crew handled everything professionally. They prioritized rebooking those passengers who had connecting flights and then deplaning the other passengers. When the hold was lifted, they efficiently re-boarded all the passengers so that we could depart before our departure limit expired.

Our second leg to Jackson WY was unable to land due to weather. We were flown back to Dallas after stopping in SLC. We were given hotel rooms and vouchers. We were told that we would be back on the same plane in the morning. Instead we were given a different flight with different seats. Not a good experience. No one knew what was going on.

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 Illinois

Recent round-trip flight deals

5/22qua
nonstopFrontier
2h 32mDEN-ORD
6/1sáb
nonstopFrontier
2h 49mORD-DEN
$57
7/23ter
nonstopFrontier
2h 06mDEN-STL
7/23ter
nonstopFrontier
2h 29mSTL-DEN
$57
7/18qui
1 stop
5h 00mDEN-ORD
7/20sáb
nonstop
2h 39mORD-DEN
$87
6/13qui
1 stop
5h 51mDEN-ORD
6/15sáb
nonstop
2h 54mORD-DEN
$108
7/30ter
1 stopDelta
5h 03mDEN-STL
8/3sáb
1 stopDelta
7h 20mSTL-DEN
$196
6/12qua
1 stopDelta
5h 52mDEN-ORD
6/15sáb
1 stopDelta
5h 54mORD-DEN
$200
7/17qua
1 stopAmerican Airlines
5h 18mDEN-PIA
7/20sáb
1 stopAmerican Airlines
4h 53mPIA-DEN
$245
7/23ter
1 stopAmerican Airlines
5h 08mDEN-STL
7/23ter
1 stopAmerican Airlines
7h 27mSTL-DEN
$262
10/30qua
1 stopUnited Airlines
7h 00mDEN-DEC
11/2sáb
1 stopUnited Airlines
6h 09mDEC-DEN
$305
5/25sáb
nonstopUnited Airlines
2h 13mDEN-MLI
5/27seg
nonstopUnited Airlines
2h 27mMLI-DEN
$319

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Recent one-way flight deals

6/1sáb
nonstopFrontier
2h 10mDEN-STL
$36
6/12qua
nonstopFrontier
2h 35mDEN-ORD
$37
5/30qui
nonstopAmerican Airlines
2h 28mDEN-ORD
$70
7/14dom
nonstopUnited Airlines
2h 35mDEN-ORD
$83
6/17seg
1 stopDelta
5h 52mDEN-ORD
$98
6/14sex
1 stopDelta
7h 08mDEN-MDW
$98
6/30dom
nonstopUnited Airlines
2h 09mDEN-STL
$109
8/12seg
1 stopAmerican Airlines
7h 20mDEN-STL
$113
6/11ter
2 stopsAlaska Airlines
16h 47mDEN-ORD
$189
6/10seg
2 stopsAlaska Airlines
11h 03mDEN-ORD
$197

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Last minute flights from Denver to Illinois

Last minute flight, train and bus deals

5/18sáb
nonstopFrontier
2h 25mDEN-MDW
5/21ter
nonstopFrontier
2h 47mMDW-DEN
$98
5/18sáb
nonstopFrontier
2h 25mDEN-MDW
5/22qua
nonstopFrontier
2h 48mMDW-DEN
$103
5/20seg
multi-stopDelta
5h 41mDEN-ORD
6/1sáb
multi-stopDelta
4h 59mORD-DEN
$233
5/18sáb
nonstopAmerican Airlines
2h 28mDEN-ORD
5/18sáb
nonstopAmerican Airlines
2h 42mORD-DEN
$276
5/18sáb
multi-stopAmerican Airlines
6h 36mDEN-ORD
5/18sáb
multi-stopAmerican Airlines
6h 45mORD-DEN
$292
5/20seg
multi-stopDelta
5h 41mDEN-ORD
5/21ter
multi-stopDelta
5h 45mORD-DEN
$300
5/16qui
nonstopUnited Airlines
2h 30mDEN-ORD
5/16qui
nonstopUnited Airlines
2h 47mORD-DEN
$360
5/17sex
nonstopUnited Airlines
2h 32mDEN-ORD
5/17sex
multi-stopUnited Airlines
22h 08mORD-DEN
$369
5/17sex
multi-stopAlaska Airlines
25h 23mDEN-ORD
5/21ter
multi-stopAlaska Airlines
16h 58mORD-DEN
$716
5/17sex
multi-stopAlaska Airlines
14h 42mDEN-ORD
5/21ter
multi-stopAlaska Airlines
16h 58mORD-DEN
$721

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Denver - Illinois Flights