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$437+ Cheap flights from Denmark to Illinois

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
CPH — ORD
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheap flight deals from Denmark to Illinois

Keep the following information in mind while searching for Denmark to Illinois flight deals. Data was last updated julio 31, 2025.

Round-trip from

$437
(Ticket)

Popular in

July

Cheapest in

February

Average price

$781

Good round-trip deal

$605 or less

Good one-way deal

$724 or less
From Denmark to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($113 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Denmark to Illinois.
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Price to beat on a one-way flight from Denmark to Illinois.
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Find flight deals from Denmark to Illinois

Cheapest flights from Denmark to Illinois
Explore the most affordable flight options available from Denmark to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This Ticket deal was found by Cheapflights users on 7/31. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/410:45 amBLL - ORD
1 stop16h 10mLufthansa
lun. 9/89:40 pmORD - BLL
1 stop18h 35mLufthansa
Deal found 7/31$437
This Travelis deal was found by Cheapflights users on 7/30. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/166:00 amBLL - ORD
1 stop15h 10mAir France
sáb. 9/275:15 pmORD - BLL
2 stops13h 15mAir France
Deal found 7/30$489
This Travelis deal was found by Cheapflights users on 7/30. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/282:10 pmBLL - ORD
2 stops28h 45mFinnair
mié. 9/31:20 pmORD - BLL
2 stops17h 05mFinnair
Deal found 7/30$498
This Lufthansa deal was found by Cheapflights users on 7/30. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/46:35 amBLL - STL
2 stops22h 05mLufthansa
lun. 12/81:00 pmSTL - BLL
2 stops13h 40mLufthansa
Deal found 7/30$499
This Finnair deal was found by Cheapflights users on 7/30. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/282:10 pmBLL - ORD
2 stops31h 30mMultiple Airlines
mié. 9/38:25 amORD - BLL
2 stops22h 00mMultiple Airlines
Deal found 7/30$504
This American Airlines deal was found by Cheapflights users on 7/30. 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. 12/46:45 amCPH - STL
2 stops22h 37mAmerican Airlines
lun. 12/84:08 pmSTL - CPH
2 stops15h 42mAmerican Airlines
Deal found 7/30$509
This Delta deal was found by Cheapflights users on 7/30. 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. 10/112:30 pmCPH - STL
1 stop27h 07mDelta
mié. 10/86:00 pmSTL - CPH
2 stops16h 05mDelta
Deal found 7/30$511
This Air Canada deal was found by Cheapflights users on 7/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/216:50 amCPH - ORD
2 stops17h 47mAir Canada
mar. 8/268:40 amORD - CPH
1 stop15h 30mAir Canada
Deal found 7/31$517
This Ticket deal was found by Cheapflights users on 7/31. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/301:55 pmCPH - ORD
Nonstop9h 15mScandinavian Airlines
dom. 9/147:15 pmORD - CPH
Nonstop8h 30mScandinavian Airlines
Deal found 7/31$518
This American Airlines deal was found by Cheapflights users on 7/30. 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. 8/92:00 pmCPH - ORD
1 stop13h 11mAmerican Airlines
sáb. 8/309:30 pmORD - CPH
1 stop14h 10mAmerican Airlines
Deal found 7/30$521
This Delta deal was found by Cheapflights users on 7/30. 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. 9/199:00 amCPH - MDW
2 stops19h 36mDelta
sáb. 9/271:43 pmMDW - CPH
1 stop13h 12mDelta
Deal found 7/30$525
This Lufthansa deal was found by Cheapflights users on 7/29. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/46:50 pmCPH - STL
1 stop26h 05mLufthansa
lun. 12/86:42 pmSTL - CPH
2 stops21h 13mLufthansa
Deal found 7/29$526

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denmark 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 2,558,603 searches. Data last updated julio 31, 2025.
Use the filters below to find and compare flights from Denmark to Illinois that are best for you.

Fly from

Denmark

Fly to

Illinois

Route

Depart

Return

Price

BillundChicago

BLL - ORD

BLLORD

Billund

jue. 9/4

10:45 am-7:55 pm

1 stop16h 10m

Chicago O'Hare Intl

lun. 9/8

9:40 pm-11:15 pm

1 stop18h 35m

$437

BillundChicago

BLL - ORD

BLLORD

Billund

mar. 9/16

6:00 am-2:10 pm

1 stop15h 10m

Chicago O'Hare Intl

sáb. 9/27

5:15 pm-1:30 pm

2 stops13h 15m

$489

BillundChicago

BLL - ORD

BLLORD

Billund

jue. 8/28

2:10 pm-11:55 am

2 stops28h 45m

Chicago O'Hare Intl

mié. 9/3

1:20 pm-1:25 pm

2 stops17h 05m

$498

BillundSt. Louis

BLL - STL

BLLSTL

Billund

jue. 12/4

6:35 am-9:40 pm

2 stops22h 05m

Lambert-St Louis

lun. 12/8

1:00 pm-9:40 am

2 stops13h 40m

$499

BillundChicago

BLL - ORD

BLLORD

Billund

jue. 8/28

2:10 pm-2:40 pm

2 stops31h 30m

Chicago O'Hare Intl

mié. 9/3

8:25 am-1:25 pm

2 stops22h 00m

$504

CopenhagenSt. Louis

CPH - STL

CPHSTL

Kastrup Copenhagen

jue. 12/4

6:45 am-10:22 pm

2 stops22h 37m

Lambert-St Louis

lun. 12/8

4:08 pm-2:50 pm

2 stops15h 42m

$509

CopenhagenSt. Louis

CPH - STL

CPHSTL

Kastrup Copenhagen

mié. 10/1

12:30 pm-8:37 am

1 stop27h 07m

Lambert-St Louis

mié. 10/8

6:00 pm-5:05 pm

2 stops16h 05m

$511

CopenhagenChicago

CPH - ORD

CPHORD

Kastrup Copenhagen

jue. 8/21

6:50 am-5:37 pm

2 stops17h 47m

Chicago O'Hare Intl

mar. 8/26

8:40 am-7:10 am

1 stop15h 30m

$517

CopenhagenChicago

CPH - ORD

CPHORD

Kastrup Copenhagen

sáb. 8/30

1:55 pm-4:10 pm

Nonstop9h 15m

Chicago O'Hare Intl

dom. 9/14

7:15 pm-10:45 am

Nonstop8h 30m

$518

CopenhagenChicago

CPH - MDW

CPHMDW

Kastrup Copenhagen

vie. 9/19

9:00 am-9:36 pm

2 stops19h 36m

Chicago Midway

sáb. 9/27

1:43 pm-9:55 am

1 stop13h 12m

$525

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 50 results
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Best time to book a flight from Denmark to Illinois

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

Cheapflights Insights

Everything you need to know about your flight from Denmark to Illinois

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

Currently, August is the cheapest month in which you can book a flight from Denmark to Illinois (average of $245). Flying from Denmark to Illinois in March is currently the most expensive (average of $321). 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 DK to IL?

Find hourly flight availability from Denmark 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 julio 31, 2025.

When flying from Denmark to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 julio 31, 2025.
See what other customers who have flown with Delta, KLM, and LOT from Denmark to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
LOT
7.6
Good
1,105 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Related info for your journey

Find useful and relevant information for your journey from Denmark to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    The cheapest airlines for a one-way flight from Denmark to Illinois are Lufthansa ($517), Brussels Airlines ($548), and Icelandair ($550).

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Denmark 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.

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

    Currently, August is the cheapest month in which you can book a flight from Denmark to Illinois (average of $245). Flying from Denmark to Illinois in March is currently the most expensive (average of $321). 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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Alternative routes for Denmark to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Denmark to Illinois

Discover the top 4 airlines that operate flights from Denmark 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 2,558,603 searches. Data last updated julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$352Average$470FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$460Average$662FlexibilityNo cancel feeOn-time69%
Scandinavian AirlinesCheapest$515Average$828FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$530Average$742FlexibilityNo cancel feeOn-time76%

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