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DEN - ORD
sep. 17 - sep. 24
Illinois

$42+ Cheap flights from Colorado to Illinois

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 1/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — ORD
sep. 17 — sep. 241
mar. 9/17
mar. 9/24
1 adult, Economy
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DEN - ORD
sep. 17 - sep. 24

Find cheap flights from Colorado to Illinois with Cheapflights

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Cheap Colorado to Illinois flights in September & October 2024

Find cheap flight options from Colorado to Illinois specifically for the months of September and October 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,854,678 searches. Prices were last updated on septiembre 12, 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.
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/27:24 pmDEN - ORD
Nonstop2h 40mFrontier
sáb. 10/54:36 pmORD - DEN
Nonstop2h 43mFrontier
Deal found 9/11$56
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/212:28 pmDEN - MDW
Nonstop2h 24mFrontier
sáb. 10/54:19 pmMDW - DEN
Nonstop2h 41mFrontier
Deal found 9/11$56
This Cheapflightsfares deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/238:44 pmDEN - STL
Nonstop2h 05mFrontier
sáb. 10/265:20 pmSTL - DEN
Nonstop2h 23mFrontier
Deal found 9/12$57
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/178:30 pmDEN - ORD
Nonstop2h 27mUnited Airlines
dom. 10/205:15 amORD - DEN
Nonstop2h 38mUnited Airlines
Deal found 9/11$139
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/38:15 pmDEN - STL
Nonstop2h 00mSouthwest
dom. 10/610:45 pmSTL - DEN
Nonstop2h 25mSouthwest
Deal found 9/11$140
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/211:59 pmDEN - STL
1 stop7h 24mAmerican Airlines
mar. 10/86:00 amSTL - DEN
1 stop6h 31mAmerican Airlines
Deal found 9/11$158
This Delta deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/297:05 amDEN - STL
1 stop8h 05mDelta
lun. 11/46:06 amSTL - DEN
1 stop5h 20mDelta
Deal found 9/12$176
This Kissandfly.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/85:55 amDEN - ORD
2 stops22h 52mMultiple Airlines
jue. 10/108:29 pmORD - DEN
1 stop14h 19mMultiple Airlines
Deal found 9/11$190
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/812:35 amDEN - MDW
1 stop7h 20mDelta
mié. 10/239:35 amMDW - DEN
1 stop7h 34mDelta
Deal found 9/11$196

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 2,854,678 searches. Data last updated septiembre 12, 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.
This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/127:42 pmDEN - ORD
Nonstop2h 31mFrontier
sáb. 10/264:44 pmORD - DEN
Nonstop2h 53mFrontier
Deal found 9/11$60
This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/212:28 pmDEN - MDW
Nonstop2h 24mFrontier
mié. 10/99:50 amMDW - DEN
Nonstop2h 42mFrontier
Deal found 9/11$60
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/28:44 pmDEN - STL
Nonstop2h 05mFrontier
mar. 10/85:30 pmSTL - DEN
Nonstop2h 23mFrontier
Deal found 9/11$62
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/178:30 pmDEN - ORD
Nonstop2h 27mUnited Airlines
dom. 10/205:15 amORD - DEN
Nonstop2h 38mUnited Airlines
Deal found 9/11$139
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/38:15 pmDEN - STL
Nonstop2h 00mSouthwest
dom. 10/610:45 pmSTL - DEN
Nonstop2h 25mSouthwest
Deal found 9/11$140
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/211:59 pmDEN - STL
1 stop7h 24mAmerican Airlines
mar. 10/86:00 amSTL - DEN
1 stop6h 31mAmerican Airlines
Deal found 9/11$158
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/157:05 amDEN - ORD
Nonstop2h 40mSouthwest
mar. 11/195:45 pmORD - DEN
1 stop6h 00mSouthwest
Deal found 9/11$165
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/169:55 amDEN - MDW
1 stop4h 45mSouthwest
sáb. 11/167:40 pmMDW - DEN
Nonstop2h 45mSouthwest
Deal found 9/11$169
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/512:55 amDEN - STL
1 stop7h 12mDelta
dom. 12/86:00 amSTL - DEN
1 stop5h 22mDelta
Deal found 9/11$176

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 2,854,678 searches. Data last updated septiembre 12, 2024.
Book one of these great deals on flights from Colorado to Illinois. Tip: verify your flight details before completing your reservation.
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/187:24 pmDEN - ORD
Nonstop2h 40mFrontier
mié. 10/24:36 pmORD - DEN
Nonstop2h 43mFrontier
Deal found 9/11$93
This Cheapflightsfares deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/1712:23 pmDEN - MDW
Nonstop2h 24mFrontier
mar. 9/249:45 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 9/10$95
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/198:14 pmDEN - STL
Nonstop2h 05mFrontier
mar. 9/245:30 pmSTL - DEN
Nonstop2h 21mFrontier
Deal found 9/11$156
This American Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/217:05 amDEN - ORD
Nonstop2h 33mAmerican Airlines
sáb. 9/216:50 pmORD - DEN
Nonstop3h 04mAmerican Airlines
Deal found 9/10$261
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/2012:35 amDEN - ORD
1 stop7h 36mDelta
mar. 9/247:15 amORD - DEN
1 stop7h 39mDelta
Deal found 9/11$280
This Delta deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/2012:55 amDEN - MDW
1 stop7h 46mDelta
mar. 9/247:30 pmMDW - DEN
1 stop4h 34mDelta
Deal found 9/12$280
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/1812:55 amDEN - STL
1 stop7h 01mDelta
mar. 9/245:44 pmSTL - DEN
1 stop6h 20mDelta
Deal found 9/11$293
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/197:05 amDEN - STL
1 stop4h 54mAmerican Airlines
sáb. 9/215:30 amSTL - DEN
1 stop5h 21mAmerican Airlines
Deal found 9/11$310
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/202:37 pmMTJ - ORD
1 stop5h 35mAmerican Airlines
lun. 9/235:00 amORD - MTJ
1 stop5h 55mAmerican Airlines
Deal found 9/11$328

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 2,854,678 searches. Data last updated septiembre 12, 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.
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/19:27 pmDEN - ORD
Nonstop2h 36mFrontier
Deal found 9/11$42
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/278:28 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 9/11$42
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/48:40 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 9/11$43
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/106:05 amDEN - ORD
Nonstop2h 31mUnited Airlines
Deal found 9/11$70
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/86:10 amDEN - STL
Nonstop2h 10mSouthwest
Deal found 9/10$70
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/155:00 amDEN - STL
1 stop4h 46mAmerican Airlines
Deal found 9/11$79
This Southwest deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/58:05 amDEN - MDW
Nonstop2h 25mSouthwest
Deal found 9/12$86
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/2212:55 amDEN - STL
1 stop7h 14mDelta
Deal found 9/11$88
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/117:05 amDEN - ORD
Nonstop2h 40mSouthwest
Deal found 9/11$95

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 2,854,678 searches. Data last updated septiembre 12, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$56 - $329

Route

Depart

Return

Price

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

mié. 10/2

Nonstop2h 40m

Chicago O'Hare Intl

sáb. 10/5

Nonstop2h 43m

$56

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

mié. 10/2

Nonstop2h 05m

Lambert-St Louis

mar. 10/8

Nonstop2h 23m

$62

Denver IntlChicago Midway

DEN - MDW

DENMDW

Denver Intl

mar. 10/1

Nonstop2h 24m

Chicago Midway

sáb. 10/5

Nonstop2h 41m

$66

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

jue. 10/17

Nonstop2h 27m

Chicago O'Hare Intl

dom. 10/20

Nonstop2h 38m

$139

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

jue. 10/3

Nonstop2h 00m

Lambert-St Louis

dom. 10/6

Nonstop2h 25m

$140

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

mié. 10/2

1 stop7h 24m

Lambert-St Louis

mar. 10/8

1 stop6h 31m

$158

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

mar. 10/29

1 stop8h 05m

Lambert-St Louis

lun. 11/4

1 stop5h 20m

$176

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

mar. 10/8

2 stops22h 52m

Chicago O'Hare Intl

jue. 10/10

1 stop14h 19m

$190

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

mié. 10/23

1 stop15h 58m

Lambert-St Louis

sáb. 10/26

2 stops22h 20m

$329

Flights are sorted by cheapest first

Deals found on 9/11

Best time to book a flight from Colorado to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Colorado with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Colorado to Illinois

Get recent, data-driven insights about flights from Colorado to Illinois including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Colorado to Illinois?

Currently, April is the cheapest month in which you can book a flight from Colorado to Illinois (average of $25). Flying from Colorado to Illinois in July is currently the most expensive (average of $87). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CO to IL?

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 septiembre 12, 2024.

A simple way to save on the total cost of your ticket is to fly from Colorado to Illinois in the evening. If you’re flexible enough to do this you can expect to save up to 72% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Colorado to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Colorado to Illinois. Price data was last updated on September 8, 2024.

Travelers seeking maximum savings on their Colorado to Illinois flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Find deals

Weekly flight availability from Colorado to Illinois

Explore weekly flight availability from Colorado to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated septiembre 12, 2024.

The most flights from USCO to USIL are scheduled on a Thursday (60 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 septiembre 12, 2024.
Read through reviews of airlines operating flights from Colorado to Illinois, such as American Airlines, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,342 reviews

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.2
Very good
5,342 reviews
Southwest
8.2
Very good
5,342 reviews

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,357 reviews
Southwest
8.2
Very good
5,342 reviews

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
9,116 reviews
Southwest
8.2
Very good
5,342 reviews

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

JetBlue
7.6
Good
3,713 reviews
Southwest
8.2
Very good
5,342 reviews

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,570 reviews
Southwest
8.2
Very good
5,342 reviews

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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.

  • Can I find flights from Colorado to Illinois for under $100 on Cheapflights?

    Yes, there are multiple flights from Colorado to Illinois for under $100. The cheapest flight booked recently is on Frontier for just $56, but on average you can expect to pay $186.

  • Are there nonstop flights from Colorado to Illinois for under $100 on Cheapflights?

    Cheapflights has at least 12 direct flights from Colorado to Illinois under $100. A good price for a nonstop flight from Colorado to Illinois is less than $176.

  • Are there last-minute flights available from Colorado to Illinois for under $100?

    There are currently 20+ open flights from Colorado to Illinois within the next 7 days for less than $100.

  • What days are nonstop flights available from Colorado to Illinois?

    Days when nonstop flights are available for this flight are: Monday, Tuesday, Saturday.

  • How many flights depart from Colorado to Illinois on average per day?

    Travelers can expect 10 flights from Colorado to Illinois on average per day.
    Early Morning (Midnight to 6am) - 20% of flight departures
    Morning (6am - Noon) - 50% of flight departures
    Afternoon (Noon - 6pm) - 10% of flight departures
    Evening (6pm - Midnight) - 20% of flight departures

  • How long is the flight from Colorado to Illinois?

    Airlines like Frontier, United Airlines, and Southwest fly from Colorado to Illinois in about 2h. The time it takes to get you to your destination is usually consistent. Colorado and Illinois are separated by a distance of 891 mi. Most flights are nonstop.

  • What are the cheapest airlines to fly from Colorado to Illinois one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $42. However, be on the lookout for offers from United Airlines and Southwest, as they are both options that can get you from Colorado to Illinois for a low price.

  • What does DEN to ORD mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Denver Intl Airport to Chicago O'Hare Intl Airport flight would often be abbreviated as a DEN to ORD flight. Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Champaign University-Willard Airport (CMI) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Colorado to Illinois that include extra baggage allowance?

    The amount of baggage you can bring on your Colorado to Illinois flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Colorado to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Colorado to Illinois flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Colorado to Illinois that include hotel bookings?

    Yes. In addition to deals on Colorado to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Illinois.

  • Can I find deals for business class flights from Colorado to Illinois?

    Yes. Cheapflights offers flight deals from Colorado to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Colorado to Illinois that allow pets onboard?

    Many airlines flying from Colorado to Illinois offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Colorado to Illinois?

    Yes, you can often find last-minute deals on Colorado to Illinois flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Colorado to Illinois flight deals updated?

    The Colorado to Illinois flight deals you see on this page were last updated on 9/11.

  • What is the cheapest month to book a flight from Colorado to Illinois?

    Currently, April is the cheapest month in which you can book a flight from Colorado to Illinois (average of $25). Flying from Colorado to Illinois in July is currently the most expensive (average of $87). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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