Frontier's Economy Bundle includes a carry-on and seat choice, offering budget-friendly travel.
Choose Premium Bundle for extra legroom and priority boarding, enhancing comfort.
Planning a trip from Chicago to Denver? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.
When planning a trip from Chicago to Denver, it's important to consider the day of the week and month you choose to fly. Generally, Tuesdays and Saturdays are the cheapest days to fly, while April and May offer the most affordable monthly rates.
Cheapest Route: Opt for flights from Chicago Midway (MDW) to Denver (DEN) for the most cost-effective route.
Booking Advance: Book your flight at least 16 days in advance to get the best deal.
Budget Airline: Frontier Airlines typically offers the cheapest fares for this route.
Flight Type: Direct flights are generally cheaper than those with a layover for this particular route.
This feature is powered by ChatGPT: an OpenAI-developed artificial intelligence model trained with KAYAK proprietary data and third-party data not verified by KAYAK.
Low season | January |
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High season | July |
Cheapest flight | $39 |
Find which airlines fly direct from Chicago to Denver Intl Airport, which days they fly and book direct flights.
Direct departures
Chicago to Denver Intl
Monday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Tuesday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Wednesday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Thursday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Friday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Saturday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Sunday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Direct returns
Denver Intl to Chicago
Monday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Tuesday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Wednesday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Thursday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Friday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Saturday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
Sunday
American Airlines, Frontier, Southwest, +1 more
American Airlines, Frontier, +2 more
1
My flight to Chicago left and landed early. My return flight left two minutes late and arrived 2 minutes late. My seat selections were ideal! There were no snacks going to Chicago and no snacks on the return trip. There are no charging outlets on board.
My flight to Chicago left and landed early. My return flight left two minutes late and arrived 2 minutes late. My seat selections were ideal! There were no snacks going to Chicago and no snacks on the return trip. There are no charging outlets on board.
WiFi on the flight was not working. Thus, entertainment options were limited.
I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.
For the first time in a long time we had a flawless experience with Southwest. Both flights were early and no mechanical errors at all. We were shocked and pleasantly surprised 😮.
One of the crew performed a hilarious skit to accompany the standard instructions. Passengers enjoyed it so much they applauded at the end!
Excellent experience. WiFi worked on this leg of My trip
It was really nice! I appreciate the gate attendant allowing families with small children to board early on in the process… that was very helpful! The internet service didn’t work with the app I was trying to use even though I paid the $8… other than that it was great! Oh and I should’ve asked for the whole cranberry cocktail can. That cup was about 2 sips…
I love no assigned seats and bags fly free. If Private Equity gets their way and forces Southwest to change they will be everyone else and I will stop being loyal to them. DON'T CHANGE YOUR BUSINESS MODEL!!!
wifi wasn't working correctly so couldn't watch live tv
Flight was delayed by 12 minutes. Boarding wasn’t fun. The crew was nice though.
Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.
The Dekta Rep that checked us in was great. She's very personable, pleasant, and can tell she enjoys her job.
The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.
Terrible and im avoiding them in the future. My initial flight was delayed causing me to rebook my flight and when speaking with the representative to rebook I explained this is the second time my flights were delayed and they did nothing to help me. I wasn't booked to comfort plus or given a voucher or anything. I was almost late for my meeting that I needed to attend on Monday because of the games delta played delaying my flights even more and putting me in the very back of the plane next to an extremely intoxicated passenger
Flights on time. .Ride was as comfortable as can be expected in steerage. Luggage arrived at destination. Attendants were fairly friendly.
Great staff. Wifi is terrible. Signing up for skylines is a painstaking process. Had to call customer service just to get my flight itinerary and confirmation sent to me. Consistent delays. A well staffed company that is run so poorly. Upper management needs to be renewed.
The WiFi didn't seem as fast as it normally is
Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!
The crew was wonderful and attentive. The seats near exit row were restrictive. Offer healthy snacks please
Delta is a premier airline so my expectations are most always met.
Food choices were very limited. Taste of the dishes was average.
I liked all the informational texts. I always knew where to go and when .
Received an email the night before showing that there would be seatback entertainment on our flight. We get on and there was no seatback entertainment. And then it was a scramble to try to set up the iPads for the kids before takeoff so they could watch something for the four hour flight.
The reason I don’t fly United. No in seat entertainment for a long flight and inconsistent WiFi and entertainment available from my device.
It was a good flight. Nothing comes to mind about how it could have been better. It was a newer plane, seemed like a great upgrade from your older ones. Staff was very good as well.
The food for long haul was poor compared to Singapore airlines economy. Pasta plain with tomato sauce . Singapore airlines give me Hagen dash small ice cream cup it was great. The choices of dinner course Singapore air also much better The crew mostly friendly. The economy seat are as expected.
The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.
Flight was 3 1/2 hour delayed with no credit or meal vouchers
late departure due to some unspecified issue with ventilating the cabin. They got it running but it was FREEZING for the whole flight. I asked for a blanket but they didn't provide one. They could not turn up the heat. it was quite miserable.
Liked that we left on time for each flight. Snacks not the best, but we're okay.
I have long legs, my foot was out in the aisle and when a flight attendant came walking by and I didn't notice, instead of saying "excuse me" or anything like that, she kicked my foot. Extremely rude
Excellent! The gate agents were kind enough to rebook me on an earlier flight saving me from a 6 hour layover. Even my luggage made it despite the fact that the connection was technically too narrow. The flight itself was very comfortable, roomy, and clean. Plenty of space for my carryon items with plugs to charge my phone. After a long international flight of 14 hours, this was an excellent way to end my travels!
One of the best flights I’ve had. So smooth.
Great experience. Flight boarded easily. Departed early. Smooth flight. Great arrival in DC--almost no taxing! Almost direct to gate from runway. Crew was terrific. Same cookies and beverages in main cabin. I did not use the entertainment system on this flight.
Most of the delay was due to weather which is not what was at issue here. One delay was due to a missing flashlight and in the end the flashlight was actually found on the plane. The entertainment system is very limited. Live TV options offer only a few channels that are not very appealing. Boarding and deplaning are always difficult. It just takes too much time to get on and off the plane. On the plus side, I missed my connecting flight, but was easily able to book a later flight from the app while enroute.
You were more on time than United. I'm so over united delays.
The meals were mediocre and the alcohol selection was poor. I enjoyed the selection of movies and other entertainment.
I chatted with the captain before the flight, and similarly during the welcome announcement, he warned of a turbulent flight that may impact the in-flight service. However, once at altitude, he announced that the weather changed and he immediately turned off the seatbelt sign. But it appeared the cabin crew had already decided to take off this flight. They remained seated and then just chatted in the galley. The flight was fully catered, but only first class received service.
My flight attendant was attentive! The elderly person next to me was flatulent and the flight attendant could see that I was in distress and brought me some face masks
My boarding pass wouldn't pull up in the app very easily and had to really dig through my email. That caused a delay in TSA..
The plane failed preflight inspection, so we sat there for 90 mins while they tried to fix it. Ultimately, everything was remedied and we made our connecting flight; instead of a 2 hour layover at the airport, we spent it waiting on the plane.
I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.
The seats were extremely hard and uncomfortable. It was disappointing even for a budget airline.
Delayed each time on a round trip with no significant weather interference. Updates to flight times came after the fact. 30 min behind in boarding and board and phone still show an on time departure. Some mysterious extra 300 miles that came so surprising they had to fuel while we were already on board?
Our flight was canceled for no known reason. We weren’t told until we were checking in at 5:00 am. This was after our last flight with Frontier where we sat on the plane for three hours (not an exaggeration) before we took off because of a mechanical issue. We won’t be flying Frontier again.
Allowed me to chose my seat without extra charge (I purchased full-price ticket) and boarding was in group1. Didn't even serve water.
Stuck in Phoenix for two days, not even a hotel voucher offered.
Every day about it was very different all the boarding pass where all wrong l miss flight no refund all crazy
Flight got delayed for 3.5 hours, and for the first hour after the departure time there was no update from the gate folks...
Both flights were delayed. The sizing of bags is crazy. I know it is advertised as a no frills cheaper option but it does feel like you are being extorted for money the whole way-- $20 dollars to talk to a gate agent? Charging for soda a pretzels? I don't think I will be flying Frontier again if I can help it. That said, all the staff were wonderful.
Average price | Average duration | |
---|---|---|
Flights | $348 | 2h 35m |
Trains | $247 | 18h 54m |
Buses | $203 | 24h 15m |
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