Cheap flights from Denver (DEN) to Illinois from $37

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 6/25. 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
jun. 18 — jun. 251

How far in advance should I book a flight from Denver to Illinois?

Users have found that booking a flight from Denver to Illinois at least 56 days early can save you up to 84% on average compared to booking a flight this week. If booking 56 days before your flight isn’t an option for you, users have found flights from Denver to Illinois for as little as $155 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $293 for flights departing within the next 3 days.

What is the cheapest month to fly from Denver to Illinois?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, April can be a great choice for travel to Illinois. Flights to Illinois from Denver in April are about $180 on average during April, but can be found for as low as $40.

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to Illinois as you normally would.

Cheap Denver to Illinois flights in June & July 2024

Find cheap flight options from Denver to Illinois specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,214,720 searches. Prices were last updated on junio 13, 2024.
These are some of the best deals we've found on flights to Illinois in 2024 at this time. For more flight deals, be sure to check back very soon.
mar. 7/99:00 pmDEN - ORD
Nonstop2h 35mFrontier
mar. 7/166:00 amORD - DEN
Nonstop2h 40mFrontier
Deal found 6/11$51
mar. 7/99:00 pmDEN - ORD
Nonstop2h 35mFrontier
mar. 7/166:00 amORD - DEN
Nonstop2h 40mFrontier
Deal found 6/11$57
mar. 7/95:26 pmDEN - MDW
Nonstop2h 24mFrontier
mar. 7/169:45 pmMDW - DEN
Nonstop2h 45mFrontier
Deal found 6/11$58
mié. 6/196:20 amDEN - STL
Nonstop2h 09mFrontier
mar. 6/253:47 pmSTL - DEN
Nonstop2h 29mFrontier
Deal found 6/12$58
mar. 6/251:46 pmDEN - MDW
Nonstop2h 24mFrontier
mar. 7/99:45 pmMDW - DEN
Nonstop2h 45mFrontier
Deal found 6/12$60
sáb. 7/136:34 pmDEN - MDW
Nonstop2h 26mFrontier
sáb. 7/2010:55 pmMDW - DEN
Nonstop2h 47mFrontier
Deal found 6/13$66
mié. 7/108:05 pmDEN - ORD
Nonstop2h 28mFrontier
dom. 7/146:00 amORD - DEN
Nonstop2h 40mFrontier
Deal found 6/12$67
vie. 7/58:51 amDEN - MDW
Nonstop2h 23mFrontier
mié. 7/106:15 amMDW - DEN
Nonstop2h 41mFrontier
Deal found 6/12$68
mar. 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
jue. 7/410:41 pmMDW - DEN
Nonstop2h 54mFrontier
Deal found 6/12$70

Denver to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Denver and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,214,720 searches. Data last updated junio 13, 2024.
These are some of the best deals we've found on flights to Illinois in 2024 at this time. For more flight deals, be sure to check back very soon.
mié. 8/146:26 amDEN - STL
Nonstop2h 11mFrontier
mié. 8/148:00 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 6/12$48
mié. 9/189:27 pmDEN - ORD
Nonstop2h 36mFrontier
mar. 9/248:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 6/11$50
mar. 8/278:30 amDEN - MDW
Nonstop2h 22mFrontier
mar. 9/106:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 6/12$50
mar. 7/99:00 pmDEN - ORD
Nonstop2h 35mFrontier
mar. 7/166:00 amORD - DEN
Nonstop2h 40mFrontier
Deal found 6/11$51
vie. 8/239:27 pmDEN - ORD
Nonstop2h 36mFrontier
mar. 8/278:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 6/12$52
mié. 8/218:30 amDEN - MDW
Nonstop2h 22mFrontier
sáb. 8/246:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 6/12$53
lun. 8/126:15 amDEN - STL
Nonstop2h 10mFrontier
sáb. 8/178:00 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 6/12$53
dom. 9/18:30 amDEN - MDW
Nonstop2h 22mFrontier
mié. 9/46:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 6/12$55
sáb. 8/178:40 pmDEN - ORD
Nonstop2h 31mFrontier
vie. 8/236:48 pmORD - DEN
Nonstop2h 44mFrontier
Deal found 6/12$57

Denver to Illinois flights leaving soon

Find last-minute flight options from Denver 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 3,214,720 searches. Data last updated junio 13, 2024.
Book one of these great deals on flights from Denver to Illinois. It's wise to confirm all flight details are correct before booking.
mié. 6/196:20 amDEN - STL
Nonstop2h 09mFrontier
mar. 6/253:47 pmSTL - DEN
Nonstop2h 29mFrontier
Deal found 6/12$58
mié. 6/196:20 amDEN - STL
Nonstop2h 09mFrontier
sáb. 6/228:02 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 6/11$87
mié. 6/196:20 amDEN - STL
Nonstop2h 09mFrontier
sáb. 6/228:02 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 6/12$88
sáb. 6/225:31 pmDEN - ORD
Nonstop2h 35mFrontier
mié. 6/269:53 pmORD - DEN
Nonstop2h 57mFrontier
Deal found 6/12$96
sáb. 6/228:25 amDEN - MDW
Nonstop2h 22mFrontier
mié. 6/265:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 6/12$96
mar. 6/1811:39 amDEN - STL
Nonstop2h 08mFrontier
mié. 6/268:02 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 6/12$111
mié. 6/1911:56 pmDEN - ORD
1 stop9h 35mFrontier
mié. 6/269:53 pmORD - DEN
Nonstop2h 57mFrontier
Deal found 6/12$117
sáb. 6/226:04 pmDEN - MDW
Nonstop2h 26mFrontier
sáb. 6/295:40 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 6/12$118
jue. 6/209:10 pmDEN - ORD
Nonstop2h 30mFrontier
mié. 6/269:53 pmORD - DEN
Nonstop2h 57mFrontier
Deal found 6/12$119

One-way flights to Illinois from Denver

Search for one-way flight options from Denver 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 3,214,720 searches. Data last updated junio 13, 2024.
Some of the best available deals we've found on one-way flights from Denver to Illinois. Users needing a return flight from Denver to Illinois should utilize the search form above.
mar. 6/259:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 6/12$37
mar. 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/12$37
jue. 7/119:00 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 6/13$38
jue. 7/189:00 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 6/12$39
dom. 11/178:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/13$39
mié. 7/246:15 amDEN - STL
Nonstop2h 10mFrontier
Deal found 6/12$39
vie. 7/58:51 amDEN - MDW
Nonstop2h 23mFrontier
Deal found 6/13$41
lun. 8/199:27 pmDEN - ORD
Nonstop2h 36mFrontier
Deal found 6/13$44
dom. 8/258:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/12$44

Find flights from Denver to Illinois within your budget

Customize your flight search to find flights from Denver 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 3,214,720 searches. Data last updated junio 13, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$48 - $131

Route

Depart

Return

Price

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

mié. 8/14

Nonstop2h 11m

Lambert-St Louis

mié. 8/14

Nonstop2h 28m

$48

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

mié. 9/18

Nonstop2h 36m

Chicago O'Hare Intl

mar. 9/24

Nonstop2h 45m

$50

Denver IntlChicago Midway

DEN - MDW

DENMDW

Denver Intl

mar. 8/27

Nonstop2h 22m

Chicago Midway

mar. 9/10

Nonstop2h 43m

$50

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

mar. 7/9

Nonstop2h 35m

Chicago O'Hare Intl

mar. 7/16

Nonstop2h 40m

$51

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

vie. 8/23

Nonstop2h 36m

Chicago O'Hare Intl

mar. 8/27

Nonstop2h 45m

$52

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

vie. 10/11

Nonstop2h 33m

Chicago O'Hare Intl

dom. 10/13

Nonstop2h 38m

$98

Denver IntlGreater Peoria

DEN - PIA

DENPIA

Denver Intl

vie. 8/9

Nonstop2h 00m

Greater Peoria

lun. 8/12

Nonstop2h 20m

$100

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

mar. 8/6

Nonstop2h 35m

Chicago O'Hare Intl

vie. 8/9

1 stop14h 18m

$108

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

jue. 8/22

Nonstop2h 30m

Chicago O'Hare Intl

jue. 8/22

Nonstop2h 39m

$131

Flights are sorted by cheapest first

Deals found on 6/12

No data available for this route at this time. Please check back soon.

Best time to book a flight from Denver to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Denver 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.

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 junio 13, 2024.
Get a feel of what it's like to fly with Frontier, Delta and Sun Country Air from Denver to Illinois by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,872 reviews

Crew

8.7

Boarding

8.3

Entertainment

7.8

Food

7.3

Overall

8.2

Comfort

8.1

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
5,872 reviews
Southwest
8.2
Very good
5,872 reviews

Crew

8.7

Boarding

8.3

Entertainment

7.8

Food

7.3

Overall

8.2

Comfort

8.1

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

8.1
Very good
9,272 reviews
Southwest
8.2
Very good
5,872 reviews

Crew

8.7

Boarding

8.3

Entertainment

7.8

Food

7.3

Overall

8.2

Comfort

8.1

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

8.0
Very good
10,000 reviews
Southwest
8.2
Very good
5,872 reviews

Crew

8.7

Boarding

8.3

Entertainment

7.8

Food

7.3

Overall

8.2

Comfort

8.1

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

7.5
Good
989 reviews
Southwest
8.2
Very good
5,872 reviews

Crew

8.7

Boarding

8.3

Entertainment

7.8

Food

7.3

Overall

8.2

Comfort

8.1

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

7.4
Good
10,000 reviews
Southwest
8.2
Very good
5,872 reviews

Crew

8.7

Boarding

8.3

Entertainment

7.8

Food

7.3

Overall

8.2

Comfort

8.1

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Related info for your journey

Find useful and relevant information for your journey from Denver to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly from for flights from Denver to Illinois?

    Most people fly from Denver Intl (DEN) if they book a flight from Denver to Illinois. Denver Intl is conveniently located just 18.5 mi from Denver’s city center.

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

    Yes, there are multiple flights from Denver to Illinois for under $100. The cheapest flight booked recently is on Frontier for just $48, but on average you can expect to pay $58.

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

    Cheapflights has at least 20 direct flights from Denver to Illinois under $100. A good price for a nonstop flight from Denver to Illinois is less than $56.

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

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

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

    Nonstop flights can be found on the following days: Thursday, Saturday.

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

    10 flight departures from Denver to Illinois per day on average.
    Early Morning (Midnight to 6am) - 40% of flight departures
    Morning (6am - Noon) - 40% of flight departures
    Afternoon (Noon - 6pm) - 20% of flight departures

  • How long is the flight from Denver to Illinois?

    There are many flights that can get you from Denver to Illinois in 2h 11m. Fly via Frontier to get the fastest option. Denver and Illinois are separated by a distance of 891 mi. All flights are typically nonstop.

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

    $37 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $49 and $50, respectively.

  • What are the most popular routes from Denver to Illinois?

  • What are the most reliable airlines from Denver to Illinois?

    No one likes to see their flight delayed. When booking a flight from Denver to Illinois consider choosing Copa Airlines (98%), Austrian Airlines (85%) or Scandinavian Airlines (83%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Denver to Illinois?

    Looking at all options, your cheapest flight can be booked for $55. While the most popular route (Denver Intl - Chicago O'Hare Intl) can be booked for $83 on average our data indicates $705 when flying from Denver to Illinois.

  • What does DEN to ORD mean?

    DEN stands for Denver Intl Airport, while ORD stands for Chicago O'Hare Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI) are some additional IATA codes for airports related to your trip.

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

    The amount of baggage you can bring on your Denver 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 Denver to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Denver 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 Denver to Illinois that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Denver 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 Denver to Illinois that allow pets onboard?

    Many airlines flying from Denver 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 Denver to Illinois?

    Yes, you can often find last-minute deals on Denver 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 Denver to Illinois flight deals updated?

    The Denver to Illinois flight deals you see on this page were last updated on 6/12.

  • What are the most popular airlines that fly from Denver to Illinois?

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

    Currently, February is the cheapest month in which you can book a flight from Denver to Illinois (average of $244). Flying from Denver to Illinois in July is currently the most expensive (average of $320). 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.

See more FAQs

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Top 6 airlines flying from Denver to Illinois

Discover the top 6 airlines that operate flights from Denver 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 3,214,720 searches. Data last updated junio 13, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$34Average$133FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$85Average$162FlexibilityNo cancel feeOn-time88%
Spirit AirlinesCheapest$115Average$209FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$148Average$353FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$151Average$399FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$346FlexibilityNo cancel feeOn-timeN/A

Search flights from Denver to Illinois by cabin class

Find flights from Denver to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from Denver to Illinois

Find hourly flight availability from Denver 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 junio 13, 2024.
12%of flight departuresEarly morningMidnight to 6 am
45%of flight departuresMorning6 am to noon
31%of flight departuresAfternoonNoon to 6 pm
12%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM
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