Cheap flights from Colorado to Illinois from $38
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/26. 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.
DEN — ORD
May 14 — May 211
From?
To?
1 adult, Economy
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How far in advance should I book a flight from Colorado to Illinois?
To save up to 79% on this flight, we recommend booking at least 56 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Colorado to Illinois from $155 1-2 weeks out and tickets from $299 for flights departing within the next 72 hours.
What is the cheapest month to fly from Colorado to Illinois?
April is one of the best times of the year to fly to Illinois from Colorado. Prices for April average $188 per person but you can even find prices for as low as $40. The most expensive prices can be found in the month of June. Opting for a April flight can save you 40% on your journey compared to booking in June
When is the cheapest time to fly from Colorado to Illinois (CO - IL)?
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Illinois as you normally would.
Cheap Frontier flights from Colorado to Illinois
Explore cheap flight options specifically provided by Frontier for the route between Colorado and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Peruse some of the lowest-priced Frontier flights we've found from Colorado to Illinois. It's recommended that users confirm their flight details before booking.
Wed 5/299:41 pmDEN - ORD
Nonstop2h 32mFrontier
Tue 6/48:00 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$57
Wed 5/159:27 pmDEN - ORD
Nonstop2h 29mFrontier
Sat 5/185:56 pmORD - DEN
Nonstop2h 49mFrontier
Deal found 5/7$58
Tue 5/215:37 pmDEN - ORD
Nonstop2h 38mFrontier
Wed 5/226:45 pmORD - DEN
Nonstop2h 51mFrontier
Deal found 5/8$59
Sat 5/188:50 pmDEN - ORD
Nonstop2h 28mFrontier
Tue 5/218:00 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$60
Wed 5/229:41 pmDEN - ORD
Nonstop2h 32mFrontier
Sun 5/268:15 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$61
Wed 5/299:41 pmDEN - ORD
Nonstop2h 32mFrontier
Sat 6/15:56 pmORD - DEN
Nonstop2h 49mFrontier
Deal found 5/8$62
Wed 5/297:44 amDEN - MDW
Nonstop2h 25mFrontier
Wed 6/55:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 5/8$63
Wed 6/125:13 pmDEN - ORD
Nonstop2h 35mFrontier
Sat 6/1510:11 pmORD - DEN
Nonstop2h 54mFrontier
Deal found 5/8$65
Tue 7/29:10 pmDEN - ORD
Nonstop2h 30mFrontier
Tue 7/98:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 5/9$66
Cheap Sun Country Air flights from Colorado to Illinois
Explore cheap flight options specifically provided by Sun Country Air for the route between Colorado and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Some of the lowest-priced Sun Country Air flights we've found at this time heading from Colorado to Illinois. Deals frequently update to provide users with more options.
Mon 6/2410:18 amDEN - ORD
1 stop7h 48mSun Country Air
Fri 7/58:35 pmORD - DEN
1 stop14h 08mSun Country Air
Deal found 5/8$145
Wed 6/510:25 amDEN - ORD
1 stop7h 38mSun Country Air
Fri 6/78:05 pmORD - DEN
1 stop14h 51mSun Country Air
Deal found 5/8$152
Thu 5/306:20 pmDEN - ORD
1 stop16h 18mSun Country Air
Fri 5/318:30 pmORD - DEN
1 stop21h 25mSun Country Air
Deal found 5/9$172
Fri 7/127:50 pmDEN - ORD
1 stop23h 49mSun Country Air
Sun 7/148:05 pmORD - DEN
1 stop22h 38mSun Country Air
Deal found 5/8$175
Sat 5/256:05 pmDEN - ORD
1 stop23h 58mSun Country Air
Mon 6/36:15 pmORD - DEN
1 stop22h 46mSun Country Air
Deal found 5/8$185
Sat 5/186:50 pmDEN - ORD
1 stop23h 13mSun Country Air
Sun 5/268:30 amORD - DEN
1 stop25h 30mSun Country Air
Deal found 5/9$210
Sat 5/186:50 pmDEN - ORD
1 stop23h 13mSun Country Air
Sun 5/268:30 amORD - DEN
1 stop25h 30mSun Country Air
Deal found 5/8$218
Cheap Colorado to Illinois flights in May & June 2024
Find cheap flight options from Colorado to Illinois specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Prices were last updated on May 9, 2024.
These are some of the best deals we've found on flights to Illinois in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Wed 5/229:41 pmDEN - ORD
Nonstop2h 32mFrontier
Sun 5/268:15 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$61
Wed 5/299:41 pmDEN - ORD
Nonstop2h 32mFrontier
Sat 6/15:56 pmORD - DEN
Nonstop2h 49mFrontier
Deal found 5/8$62
Wed 5/297:44 amDEN - MDW
Nonstop2h 25mFrontier
Wed 6/55:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 5/8$63
Wed 6/125:13 pmDEN - ORD
Nonstop2h 35mFrontier
Sat 6/1510:11 pmORD - DEN
Nonstop2h 54mFrontier
Deal found 5/8$65
Sat 6/17:48 amDEN - MDW
Nonstop2h 25mFrontier
Sat 6/110:01 pmMDW - DEN
Nonstop2h 57mFrontier
Deal found 5/8$65
Wed 5/159:27 pmDEN - ORD
Nonstop2h 29mFrontier
Tue 5/218:00 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/7$66
Sat 5/258:50 pmDEN - ORD
Nonstop2h 28mFrontier
Sun 5/268:15 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$67
Tue 6/119:10 pmDEN - ORD
Nonstop2h 30mFrontier
Thu 9/58:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 5/8$68
Tue 6/111:46 pmDEN - MDW
Nonstop2h 24mFrontier
Thu 9/266:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 5/8$68
Colorado to Illinois 2024 flight deals
Discover exclusive flight deals for travel between Colorado and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
These are some of the best deals we've found on flights to Illinois in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Wed 5/299:41 pmDEN - ORD
Nonstop2h 32mFrontier
Sat 6/15:56 pmORD - DEN
Nonstop2h 49mFrontier
Deal found 5/8$62
Wed 5/297:44 amDEN - MDW
Nonstop2h 25mFrontier
Wed 6/55:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 5/8$63
Wed 6/125:13 pmDEN - ORD
Nonstop2h 35mFrontier
Sat 6/1510:11 pmORD - DEN
Nonstop2h 54mFrontier
Deal found 5/8$65
Sat 6/17:48 amDEN - MDW
Nonstop2h 25mFrontier
Sat 6/110:01 pmMDW - DEN
Nonstop2h 57mFrontier
Deal found 5/8$65
Wed 5/159:27 pmDEN - ORD
Nonstop2h 29mFrontier
Tue 5/218:00 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/7$66
Sat 5/258:50 pmDEN - ORD
Nonstop2h 28mFrontier
Sun 5/268:15 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$67
Tue 6/119:10 pmDEN - ORD
Nonstop2h 30mFrontier
Thu 9/58:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 5/8$68
Tue 6/111:46 pmDEN - MDW
Nonstop2h 24mFrontier
Thu 9/266:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 5/8$68
Tue 6/410:00 amDEN - STL
Nonstop2h 09mFrontier
Sat 6/88:02 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 5/8$68
Non-stop flights to Illinois from Colorado
Discover non-stop flight options from Colorado to Illinois. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Consider booking one of these non-stop flights heading from Colorado to Illinois. Users can also choose from other Colorado to Illinois flights by using the search form above.
Tue 5/211:46 pmDEN - MDW
Nonstop2h 26mFrontier
Wed 5/225:01 amMDW - DEN
Nonstop2h 48mFrontier
Deal found 5/8$43
Wed 5/229:41 pmDEN - ORD
Nonstop2h 32mFrontier
Wed 5/296:45 pmORD - DEN
Nonstop2h 51mFrontier
Deal found 5/8$51
Wed 5/299:41 pmDEN - ORD
Nonstop2h 32mFrontier
Tue 6/48:00 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$57
Tue 7/308:44 amDEN - STL
Nonstop2h 06mFrontier
Sat 8/108:00 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 5/9$57
Tue 9/34:43 pmDEN - ORD
Nonstop2h 38mFrontier
Tue 9/248:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 5/8$58
Tue 6/410:23 amDEN - MDW
Nonstop2h 26mFrontier
Tue 6/116:00 amMDW - DEN
Nonstop2h 44mFrontier
Deal found 5/9$58
Tue 5/215:37 pmDEN - ORD
Nonstop2h 38mFrontier
Wed 5/226:45 pmORD - DEN
Nonstop2h 51mFrontier
Deal found 5/8$59
Tue 8/138:30 amDEN - MDW
Nonstop2h 22mFrontier
Sat 8/316:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 5/8$59
Sat 5/188:50 pmDEN - ORD
Nonstop2h 28mFrontier
Tue 5/218:00 amORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$60
Colorado to Illinois flights leaving soon
Find last-minute flight options from Colorado to Illinois for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Book one of these great deals on flights from Colorado to Illinois. Tip: verify your flight details before completing your reservation.
Sat 5/187:48 amDEN - MDW
Nonstop2h 25mFrontier
Sat 5/1810:01 pmMDW - DEN
Nonstop2h 57mFrontier
Deal found 5/7$93
Wed 5/156:41 amDEN - STL
Nonstop2h 06mFrontier
Wed 5/228:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 5/8$100
Wed 5/157:59 amDEN - MDW
1 stop7h 02mFrontier
Tue 5/216:00 amMDW - DEN
Nonstop2h 47mFrontier
Deal found 5/7$101
Tue 5/148:11 amDEN - MDW
Nonstop2h 27mFrontier
Wed 5/155:30 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 5/8$104
Tue 5/149:27 pmDEN - ORD
Nonstop2h 29mFrontier
Wed 5/156:27 pmORD - DEN
Nonstop2h 55mFrontier
Deal found 5/8$107
Wed 5/157:59 amDEN - MDW
1 stop7h 02mFrontier
Sat 5/1810:01 pmMDW - DEN
Nonstop2h 57mFrontier
Deal found 5/7$109
Wed 5/156:41 amDEN - STL
Nonstop2h 06mFrontier
Wed 6/128:02 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 5/8$109
Wed 5/156:31 amDEN - ORD
1 stop16h 12mFrontier
Sat 5/185:56 pmORD - DEN
Nonstop2h 49mFrontier
Deal found 5/7$115
Sun 5/197:44 amDEN - MDW
Nonstop2h 25mFrontier
Tue 5/216:00 amMDW - DEN
Nonstop2h 47mFrontier
Deal found 5/8$118
One-way flights to Illinois from Colorado
Search for one-way flight options from Colorado to Illinois. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Users traveling one-way from Colorado to Illinois can select one of these great deals. Those needing a return flight from Colorado to Illinois can use the search form above.
Sun 5/266:27 pmDEN - MDW
Nonstop2h 27mFrontier
Deal found 5/8$38
Fri 5/319:41 pmDEN - ORD
Nonstop2h 32mFrontier
Deal found 5/8$39
Mon 6/108:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/8$39
Sat 6/16:15 amDEN - STL
Nonstop2h 10mFrontier
Deal found 5/8$39
Fri 5/319:41 pmDEN - ORD
Nonstop2h 32mFrontier
Deal found 5/8$40
Sun 6/97:48 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 5/8$40
Thu 5/305:37 pmDEN - ORD
Nonstop2h 38mFrontier
Deal found 5/8$41
Sun 6/97:48 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 5/8$41
Sat 6/155:31 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 5/9$42
Find flights from Colorado to Illinois within your budget
Customize your flight search to find flights from Colorado to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Fly from
Any airport
Fly to
Any airport
Budget
$57 - $145
Route
Depart
Return
Price
Denver IntlChicago O'Hare Intl
DEN - ORD
DENORD
Denver Intl
Wed 5/29
Nonstop2h 32m
Chicago O'Hare Intl
Tue 6/4
Nonstop2h 55m
$57
Denver IntlLambert-St Louis
DEN - STL
DENSTL
Denver Intl
Tue 7/30
Nonstop2h 06m
Lambert-St Louis
Sat 8/10
Nonstop2h 28m
$57
Denver IntlChicago O'Hare Intl
DEN - ORD
DENORD
Denver Intl
Wed 5/15
Nonstop2h 29m
Chicago O'Hare Intl
Sat 5/18
Nonstop2h 49m
$58
Denver IntlChicago Midway
DEN - MDW
DENMDW
Denver Intl
Tue 5/14
Nonstop2h 27m
Chicago Midway
Wed 6/12
Nonstop2h 46m
$58
Denver IntlChicago O'Hare Intl
DEN - ORD
DENORD
Denver Intl
Tue 5/21
Nonstop2h 38m
Chicago O'Hare Intl
Wed 5/22
Nonstop2h 51m
$59
Denver IntlChicago O'Hare Intl
DEN - ORD
DENORD
Denver Intl
Sat 5/18
Nonstop2h 28m
Chicago O'Hare Intl
Tue 5/21
Nonstop2h 55m
$60
Denver IntlChicago Midway
DEN - MDW
DENMDW
Denver Intl
Wed 6/5
Nonstop2h 22m
Chicago Midway
Wed 6/12
Nonstop2h 46m
$60
Denver IntlChicago O'Hare Intl
DEN - ORD
DENORD
Denver Intl
Sat 5/25
Nonstop2h 28m
Chicago O'Hare Intl
Sun 5/26
1 stop14h 00m
$94
Denver IntlChicago O'Hare Intl
DEN - ORD
DENORD
Denver Intl
Mon 6/24
1 stop7h 48m
Chicago O'Hare Intl
Fri 7/5
1 stop14h 08m
$145
No data available for this route at this time. Please check back soon.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated May 9, 2024.
Read through reviews of airlines operating flights from Colorado to Illinois, such as Frontier, Sun Country Air and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
9,141 reviews
Food
7.3
Overall
8.1
Entertainment
7.3
Comfort
7.9
Boarding
8.2
Crew
8.6
Reviews
1 / 10
Paid a lot for our exit row seats and they weren’t that roomy.
9,141 reviews
9,141 reviews
Food
7.3
Overall
8.1
Entertainment
7.3
Comfort
7.9
Boarding
8.2
Crew
8.6
Reviews
1 / 10
Paid a lot for our exit row seats and they weren’t that roomy.
10,789 reviews
9,141 reviews
Food
7.3
Overall
8.1
Entertainment
7.3
Comfort
7.9
Boarding
8.2
Crew
8.6
Reviews
1 / 10
Paid a lot for our exit row seats and they weren’t that roomy.
4,525 reviews
9,141 reviews
Food
7.3
Overall
8.1
Entertainment
7.3
Comfort
7.9
Boarding
8.2
Crew
8.6
Reviews
1 / 10
Paid a lot for our exit row seats and they weren’t that roomy.
2,942 reviews
9,141 reviews
Food
7.3
Overall
8.1
Entertainment
7.3
Comfort
7.9
Boarding
8.2
Crew
8.6
Reviews
1 / 10
Paid a lot for our exit row seats and they weren’t that roomy.
11,043 reviews
9,141 reviews
Food
7.3
Overall
8.1
Entertainment
7.3
Comfort
7.9
Boarding
8.2
Crew
8.6
Reviews
1 / 10
Paid a lot for our exit row seats and they weren’t that roomy.
Related info for your journey
Find useful and relevant information for your journey from Colorado to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for Colorado to IllinoisSee prices for flight routes from nearby airports that may be better suited for you.
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Colorado to Illinois
Discover the top 6 airlines that operate flights from Colorado to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Search flights from Colorado to Illinois by cabin class
Find flights from Colorado to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Hourly flight availability from Colorado to Illinois
Find hourly flight availability from Colorado to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 9, 2024.
| 13%of flight departures | Early morningMidnight to 6 am |
|---|---|
| 46%of flight departures | Morning6 am to noon |
| 34%of flight departures | AfternoonNoon to 6 pm |
| 7%of flight departures | Evening6 pm to midnight |
Midnight
6 AM
Noon
6 PM
Book a flight to one of these trending destinations
User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Colorado to Illinois?
Deals for Colorado to Illinois flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Colorado to Illinois?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Colorado to Illinois.
Can Cheapflights find flights from Colorado to Illinois with no change fees?
Cheapflights does show flights with no change fees to all users. To see these options for flights from Colorado to Illinois, users can toggle the no change fees filter when performing a flight search.
Can Cheapflights notify me if prices for flights from Colorado to Illinois become cheaper?
Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Illinois from Colorado today and book when prices fit your budget.