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

To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at $344. Icelandair flights start at $345 while deals on Virgin Atlantic start at $460 one-way.

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

Travelers have found it’s best to book a flight 59 days in advance to save up to 46% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 59 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Illinois to Denmark 1-2 weeks in advance for as low as $581, or $776 for flights within the next 24 hours.

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

February is one of the best times of the year to fly to Denmark from Illinois. Prices for February average $623 per person but you can even find prices for as low as $378. The most expensive prices can be found in the month of June. Opting for a February flight can save you 44% on your journey compared to booking in June

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

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

How can I find direct flights from Illinois to Denmark?

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

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

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

$633+ Flights from Illinois to Denmark

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Cheap flight deals from Illinois to Denmark

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$531 (Ticket)
One-way from	$344 (oojo)
Popular in	June
Cheapest in	February
Average price	$575
Good round-trip deal	$576 or less
Good one-way deal	$366 or less

Provider with most accurate pricing for Chicago (CHI)-Kastrup Copenhagen flight deals.

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Provider most trusted by Cheapflights users for Chicago (CHI)-Kastrup Copenhagen flights.

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From Illinois to Denmark

Search Deals

One-way flight from Illinois to Denmark

Search Deals

Highest demand for flights based on searches. 21% potential increase in price ($175 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($25 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

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Price to beat on a round-trip flight from Illinois to Denmark.

Search Deals

Price to beat on a one-way flight from Illinois to Denmark.

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Find flight deals from Illinois to Denmark

Cheapest flights from Illinois to Denmark
Explore the most affordable flight options available from Illinois to Denmark. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2025.

Fri 9/197:25 pmORD - CPH

1 stop19h 20mIcelandair

Sat 9/2710:35 pmCPH - ORD

1 stop29h 40mIcelandair

Deal found 4/1

$534

Sun 4/137:15 pmORD - CPH

Nonstop8h 30mScandinavian Airlines

Mon 4/211:55 pmCPH - ORD

Nonstop9h 15mScandinavian Airlines

Deal found 4/1

$542

Wed 4/210:53 amORD - CPH

2 stops17h 32mAir Canada

Tue 4/812:55 pmCPH - ORD

1 stop13h 35mAir Canada

Deal found 4/1

$569

Wed 4/24:41 pmORD - CPH

1 stop11h 44mMultiple Airlines

Mon 4/78:10 pmCPH - ORD

1 stop26h 45mMultiple Airlines

Deal found 4/1

$580

Tue 4/299:30 pmORD - CPH

1 stop11h 45mFinnair

Tue 5/1312:25 pmCPH - ORD

1 stop12h 25mFinnair

Deal found 4/1

$581

Wed 5/77:00 amORD - CPH

1 stop16h 30mVirgin Atlantic

Wed 5/149:00 amCPH - ORD

2 stops16h 48mVirgin Atlantic

Deal found 4/1

$595

Tue 5/610:25 pmORD - BLL

2 stops32h 00mFinnair

Wed 5/282:10 pmBLL - ORD

2 stops28h 35mFinnair

Deal found 4/1

$596

Wed 4/27:00 amORD - CPH

2 stops28h 45mDelta

Mon 4/711:50 amCPH - ORD

1 stop33h 50mDelta

Deal found 4/1

$601

Tue 9/97:10 pmORD - BLL

1 stop14h 10mBritish Airways

Tue 9/165:05 pmBLL - ORD

2 stops23h 08mBritish Airways

Deal found 3/31

$603

Sun 5/116:38 pmMDW - CPH

2 stops28h 52mVirgin Atlantic

Wed 5/219:00 amCPH - MDW

2 stops19h 27mVirgin Atlantic

Deal found 4/1

$605

Tue 4/89:15 pmORD - CPH

1 stop19h 05mBritish Airways

Wed 4/167:20 amCPH - ORD

1 stop17h 55mBritish Airways

Deal found 4/1

$606

Sat 8/2311:45 pmORD - CPH

1 stop16h 50mTurkish Airlines

Sun 9/77:20 pmCPH - ORD

1 stop33h 40mTurkish Airlines

Deal found 3/31

$612

Best flights from Illinois to Denmark
Discover carefully curated flight deals from Illinois to Denmark that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 2, 2025.

Sun 4/137:15 pmORD - CPH

Nonstop8h 30mScandinavian Airlines

Mon 4/211:55 pmCPH - ORD

Nonstop9h 15mScandinavian Airlines

Deal found 4/1

$531

Wed 5/710:15 pmORD - CPH

1 stop16h 30mIcelandair

Wed 5/142:00 pmCPH - ORD

1 stop14h 15mIcelandair

Deal found 4/2

$532

Tue 4/299:30 pmORD - CPH

1 stop11h 45mFinnair

Tue 5/1312:25 pmCPH - ORD

1 stop12h 25mFinnair

Deal found 4/1

$581

Wed 5/77:00 amORD - CPH

1 stop16h 30mVirgin Atlantic

Wed 5/149:00 amCPH - ORD

2 stops16h 48mVirgin Atlantic

Deal found 4/1

$595

Sun 4/138:25 pmORD - CPH

1 stop27h 40mMultiple Airlines

Mon 4/211:55 pmCPH - ORD

Nonstop9h 15mMultiple Airlines

Deal found 4/1

$603

Wed 5/1410:25 pmORD - CPH

1 stop14h 40mBritish Airways

Wed 5/217:20 amCPH - ORD

1 stop16h 40mBritish Airways

Deal found 3/31

$605

Tue 5/610:25 amORD - CPH

2 stops15h 35mDelta

Tue 5/139:00 amCPH - ORD

1 stop19h 31mDelta

Deal found 4/1

$608

Sat 8/2311:45 pmORD - CPH

1 stop16h 50mTurkish Airlines

Sun 9/77:20 pmCPH - ORD

1 stop33h 40mTurkish Airlines

Deal found 3/31

$612

Wed 4/234:50 pmORD - BLL

1 stop9h 45mKLM

Mon 4/286:35 pmBLL - ORD

1 stop26h 35mKLM

Deal found 4/1

$622

Tue 9/210:00 amORD - CPH

2 stops14h 10mUnited Airlines

Wed 9/1012:20 pmCPH - ORD

1 stop14h 51mUnited Airlines

Deal found 4/1

$630

Mon 9/13:40 pmORD - CPH

1 stop32h 30mAir Canada

Wed 9/1012:20 pmCPH - ORD

2 stops14h 09mAir Canada

Deal found 4/1

$632

Sun 9/211:00 pmMDW - CPH

2 stops26h 55mAir France

Wed 10/112:20 pmCPH - MDW

1 stop12h 47mAir France

Deal found 4/1

$660

Last-minute flights from Illinois to Denmark
Discover last-minute flight deals from Illinois to Denmark. Data last updated April 2, 2025 and is based on user searches.

Wed 4/210:53 amORD - CPH

2 stops17h 32mAir Canada

Tue 4/812:55 pmCPH - ORD

1 stop13h 35mAir Canada

Deal found 4/1

$569

Wed 4/24:41 pmORD - CPH

1 stop11h 44mMultiple Airlines

Mon 4/78:10 pmCPH - ORD

1 stop26h 45mMultiple Airlines

Deal found 4/1

$580

Wed 4/27:00 amORD - CPH

2 stops28h 45mDelta

Mon 4/711:50 amCPH - ORD

1 stop33h 50mDelta

Deal found 4/1

$601

Tue 4/89:15 pmORD - CPH

1 stop19h 05mBritish Airways

Wed 4/167:20 amCPH - ORD

1 stop17h 55mBritish Airways

Deal found 4/1

$606

Tue 4/810:55 amORD - CPH

2 stops16h 45mDelta

Wed 4/162:45 pmCPH - ORD

2 stops14h 21mDelta

Deal found 4/1

$680

Wed 4/97:45 amORD - AAL

2 stops47h 00mAir France

Fri 4/186:20 amAAL - ORD

2 stops22h 05mAir France

Deal found 4/1

$671

Wed 4/94:50 pmORD - AAL

1 stop10h 00mKLM

Fri 4/186:10 pmAAL - ORD

1 stop27h 00mKLM

Deal found 4/1

$676

Wed 4/911:20 amORD - AAL

2 stops15h 30mDelta

Fri 4/186:20 amAAL - ORD

1 stop14h 50mDelta

Deal found 4/1

$719

Wed 4/91:57 pmORD - AAL

2 stops16h 58mScandinavian Airlines

Fri 4/186:20 amAAL - ORD

3 stops22h 05mScandinavian Airlines

Deal found 4/1

$1,012

Thu 4/1010:35 amORD - CPH

2 stops15h 10mUnited Airlines

Thu 4/1712:55 pmCPH - ORD

2 stops17h 45mUnited Airlines

Deal found 4/1

$730

Thu 4/101:15 pmMDW - CPH

2 stops16h 55mAir France

Thu 4/179:00 amCPH - MDW

2 stops15h 59mAir France

Deal found 4/1

$774

Thu 4/1010:15 amORD - CPH

2 stops39h 25mEthiopian Air

Thu 4/173:45 pmCPH - ORD

3 stops47h 30mEthiopian Air

Deal found 4/1

$3,336

One-way flights from Illinois to Denmark
Search for one-way flight options from Illinois to Denmark. Find affordable one-way fares based on user searches. Data last updated April 2, 2025.

Thu 8/76:00 pmORD - CPH

1 stop22h 05mTAP AIR PORTUGAL

Deal found 4/2

$344

Sun 6/1510:15 pmORD - CPH

1 stop10h 30mIcelandair

Deal found 4/1

$345

Tue 4/157:25 pmORD - CPH

2 stops17h 15mMultiple Airlines

Deal found 4/1

$348

Fri 4/44:57 pmSTL - CPH

3 stops57h 43mMultiple Airlines

Deal found 4/1

$403

Mon 7/79:40 amMDW - CPH

2 stops23h 55mMultiple Airlines

Deal found 4/1

$404

Sat 5/176:18 pmORD - CPH

1 stop29h 12mVirgin Atlantic

Deal found 4/2

$460

Sun 5/1110:30 pmORD - CPH

1 stop16h 45mLufthansa

Deal found 4/1

$467

Wed 8/69:15 pmORD - CPH

1 stop11h 35mBritish Airways

Deal found 4/1

$468

Tue 5/61:16 pmMDW - CPH

2 stops14h 24mDelta

Deal found 4/1

$487

Wed 7/2310:35 amORD - CPH

2 stops17h 05mDelta

Deal found 4/1

$487

Sat 5/174:25 pmORD - CPH

2 stops31h 05mAir France

Deal found 4/2

$496

Thu 4/106:35 pmORD - CPH

1 stop12h 40mSWISS

Deal found 4/1

$524

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Denmark that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Fri 9/19

7:25 pm-9:45 pm

1 stop19h 20m

Kastrup Copenhagen

Sat 9/27

10:35 pm-9:15 pm

1 stop29h 40m

$534

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Sun 4/13

7:15 pm-10:45 am

Nonstop8h 30m

Kastrup Copenhagen

Mon 4/21

1:55 pm-4:10 pm

Nonstop9h 15m

$542

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Tue 4/29

9:30 pm-4:15 pm

1 stop11h 45m

Kastrup Copenhagen

Tue 5/13

12:25 pm-5:50 pm

1 stop12h 25m

$581

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Wed 5/7

7:00 am-6:30 am

1 stop16h 30m

Kastrup Copenhagen

Wed 5/14

9:00 am-6:48 pm

2 stops16h 48m

$595

ChicagoBillund

ORD - BLL

ORDBLL

Chicago O'Hare Intl

Tue 5/6

10:25 pm-1:25 pm

2 stops32h 00m

Billund

Wed 5/28

2:10 pm-11:45 am

2 stops28h 35m

$596

ChicagoBillund

ORD - BLL

ORDBLL

Chicago O'Hare Intl

Tue 9/9

7:10 pm-4:20 pm

1 stop14h 10m

Billund

Tue 9/16

5:05 pm-9:13 am

2 stops23h 08m

$603

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Sun 4/13

8:25 pm-7:05 am

1 stop27h 40m

Kastrup Copenhagen

Mon 4/21

1:55 pm-4:10 pm

Nonstop9h 15m

$603

ChicagoCopenhagen

MDW - CPH

MDWCPH

Chicago Midway

Sun 5/11

6:38 pm-6:30 am

2 stops28h 52m

Kastrup Copenhagen

Wed 5/21

9:00 am-9:27 pm

2 stops19h 27m

$605

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Wed 5/14

10:25 pm-8:05 pm

1 stop14h 40m

Kastrup Copenhagen

Wed 5/21

7:20 am-5:00 pm

1 stop16h 40m

$605

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Tue 5/6

10:25 am-9:00 am

2 stops15h 35m

Kastrup Copenhagen

Tue 5/13

9:00 am-9:31 pm

1 stop19h 31m

$608

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 46 results

...

Best time to book a flight from Illinois to Denmark

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

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

Currently, November is the cheapest month in which you can book a flight from Illinois to Denmark (average of $523). Flying from Illinois to Denmark in June is currently the most expensive (average of $953). 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 IL to DK?

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

Rainfall in Denmark by month

In terms of precipitation, rainfall in Denmark ranges from 0.8 - 2.8 inches per month. August is typically the wettest month, when rainfall can reach 2.8 in. February is typically the driest time to visit Denmark when rainfall is around 0.8 in.

Temperature in Denmark by month

If weather is an important factor for your trip to Denmark, 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 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Denmark

Peruse reviews from past customers who have flown with Delta, KLM and LOT from Illinois to Denmark to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,898 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,898 reviews

Delta

8.0

Very good

7,898 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,323 reviews

Delta

8.0

Very good

7,898 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

LOT

7.6

Good

1,065 reviews

Delta

8.0

Very good

7,898 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,267 reviews

Delta

8.0

Very good

7,898 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS

7.5

Good

1,572 reviews

Delta

8.0

Very good

7,898 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What are the cheapest airlines to fly from Illinois to Denmark one-way?
To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at $344. Icelandair flights start at $345 while deals on Virgin Atlantic start at $460 one-way.
Can I find deals for flights from Illinois to Denmark that include hotel bookings?
Yes. In addition to deals on Illinois to Denmark flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Denmark?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Denmark.
Can I find deals for business class flights from Illinois to Denmark?
Yes. Cheapflights offers flight deals from Illinois to Denmark 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 Illinois to Denmark?
Currently, November is the cheapest month in which you can book a flight from Illinois to Denmark (average of $523). Flying from Illinois to Denmark in June is currently the most expensive (average of $953). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Illinois to Denmark

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Top 10 airlines flying from Illinois to Denmark

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$378	Average$625	FlexibilityNo cancel fee	On-time76%
Scandinavian Airlines	Cheapest$438	Average$715	FlexibilityNo cancel fee	On-time77%
Lufthansa	Cheapest$488	Average$687	FlexibilityNo cancel fee	On-time76%
KLM	Cheapest$501	Average$841	FlexibilityNo cancel fee	On-time75%
United Airlines	Cheapest$508	Average$672	FlexibilityNo cancel fee	On-time69%
SWISS	Cheapest$509	Average$675	FlexibilityNo cancel fee	On-time79%
Air Canada	Cheapest$521	Average$649	FlexibilityNo cancel fee	On-time67%
British Airways	Cheapest$532	Average$678	FlexibilityNo cancel fee	On-time70%
Finnair	Cheapest$570	Average$691	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$570	Average$779	FlexibilityNo cancel fee	On-timeN/A

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$344+ Cheap flights from Illinois to Denmark

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 8/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to Denmark with Cheapflights

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Cheap flight deals from Illinois to Denmark

Keep the following information in mind while searching for Illinois to Denmark flight deals. Data was last updated April 2, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to Denmark

Cheapest flights from Illinois to DenmarkExplore the most affordable flight options available from Illinois to Denmark. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2025.

Explore the most affordable flight options available from Illinois to Denmark. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Denmark that are best for you.

Best time to book a flight from Illinois to Denmark

Have a flexible travel schedule? Discover the best time to fly to Denmark from Illinois with our price prediction graph.

Cheapflights Insights

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

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

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

Find hourly flight availability from Illinois to Denmark. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 2, 2025.

Rainfall in Denmark by month

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

Temperature in Denmark by month

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

Reviews of airlines servicing Denmark

Peruse reviews from past customers who have flown with Delta, KLM and LOT from Illinois to Denmark to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Denmark. 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 Illinois to Denmark one-way?

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

How can I find direct flights from Illinois to Denmark?

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

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

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 Illinois to Denmark

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Illinois to Denmark

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Cheapest flights from Illinois to Denmark
Explore the most affordable flight options available from Illinois to Denmark. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2025.