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 $347. Icelandair flights start at $352 while deals on Delta start at $439 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 $617 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 40% 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.

$680+ Flights from Illinois to Denmark

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Cheap flight deals from Illinois to Denmark

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$567 (oojo)
One-way from	$347 (oojo)
Popular in	June
Cheapest in	February
Average price	$569
Good round-trip deal	$549 or less
Good one-way deal	$346 or less

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

Search Deals

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. 19% potential increase in price ($154 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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 22, 2025.

Tue 9/237:25 pmORD - CPH

1 stop10h 30mIcelandair

Sat 10/44:45 pmCPH - ORD

1 stop32h 30mIcelandair

Deal found 4/22

$567

Wed 10/2212:00 pmORD - CPH

2 stops15h 50mUnited Airlines

Wed 11/512:15 pmCPH - ORD

1 stop14h 17mUnited Airlines

Deal found 4/22

$577

Mon 10/208:40 amORD - CPH

2 stops19h 10mMultiple Airlines

Mon 11/37:55 pmCPH - ORD

1 stop27h 20mMultiple Airlines

Deal found 4/21

$585

Tue 10/218:40 amORD - CPH

2 stops17h 15mAir Canada

Tue 11/46:55 amCPH - ORD

2 stops14h 50mAir Canada

Deal found 4/21

$591

Mon 10/207:15 pmORD - CPH

Nonstop8h 30mScandinavian Airlines

Mon 11/32:30 pmCPH - ORD

Nonstop9h 15mScandinavian Airlines

Deal found 4/21

$593

Sat 11/226:40 pmORD - CPH

1 stop31h 10mAir Serbia

Sat 11/299:35 amCPH - ORD

1 stop14h 05mAir Serbia

Deal found 4/21

$594

Mon 5/59:40 pmORD - BLL

1 stop18h 35mLufthansa

Tue 5/276:00 amBLL - ORD

1 stop13h 30mLufthansa

Deal found 4/21

$625

Tue 5/66:35 pmORD - CPH

1 stop12h 40mSWISS

Wed 5/149:40 amCPH - ORD

1 stop13h 15mSWISS

Deal found 4/22

$625

Mon 5/56:35 pmORD - BLL

2 stops14h 50mDelta

Tue 5/276:00 amBLL - ORD

1 stop15h 10mDelta

Deal found 4/21

$628

Tue 5/610:40 amORD - BLL

2 stops20h 20mMultiple Airlines

Wed 5/281:05 pmBLL - ORD

1 stop12h 10mMultiple Airlines

Deal found 4/21

$629

Tue 5/136:25 pmMDW - CPH

2 stops14h 20mDelta

Wed 5/219:00 amCPH - MDW

2 stops19h 27mDelta

Deal found 4/21

$637

Wed 4/235:45 pmORD - CPH

1 stop19h 20mAmerican Airlines

Wed 4/307:20 amCPH - ORD

1 stop16h 40mAmerican Airlines

Deal found 4/22

$659

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 22, 2025.

Tue 9/237:25 pmORD - CPH

1 stop10h 30mIcelandair

Sat 10/44:45 pmCPH - ORD

1 stop32h 30mIcelandair

Deal found 4/22

$567

Sun 9/148:00 amORD - CPH

2 stops16h 10mUnited Airlines

Wed 9/2412:20 pmCPH - ORD

1 stop14h 51mUnited Airlines

Deal found 4/20

$599

Mon 5/123:50 pmORD - CPH

1 stop12h 00mMultiple Airlines

Mon 5/268:10 pmCPH - ORD

1 stop23h 00mMultiple Airlines

Deal found 4/21

$603

Mon 5/58:40 amORD - CPH

2 stops19h 10mAir Canada

Fri 5/1612:50 pmCPH - ORD

1 stop13h 40mAir Canada

Deal found 4/21

$607

Mon 5/59:40 pmORD - BLL

1 stop18h 35mLufthansa

Tue 5/276:00 amBLL - ORD

1 stop13h 30mLufthansa

Deal found 4/21

$625

Tue 5/66:35 pmORD - CPH

1 stop12h 40mSWISS

Wed 5/149:40 amCPH - ORD

1 stop13h 15mSWISS

Deal found 4/22

$625

Mon 5/56:35 pmORD - BLL

2 stops14h 50mDelta

Tue 5/276:00 amBLL - ORD

1 stop15h 10mDelta

Deal found 4/21

$628

Mon 9/1511:45 pmORD - CPH

1 stop35h 40mTurkish Airlines

Mon 9/2210:25 amCPH - ORD

1 stop18h 35mTurkish Airlines

Deal found 4/20

$669

Sat 10/186:50 pmORD - CPH

1 stop29h 15mScandinavian Airlines

Sat 11/12:30 pmCPH - ORD

Nonstop9h 15mScandinavian Airlines

Deal found 4/21

$672

Mon 8/116:10 pmORD - CPH

1 stop15h 40mTAP AIR PORTUGAL

Sat 8/165:40 pmCPH - ORD

1 stop29h 35mTAP AIR PORTUGAL

Deal found 4/22

$681

Fri 9/192:09 pmORD - CPH

2 stops14h 06mAmerican Airlines

Fri 10/32:00 pmCPH - ORD

2 stops14h 30mAmerican Airlines

Deal found 4/22

$709

Tue 7/159:15 pmORD - CPH

1 stop15h 00mBritish Airways

Mon 7/219:45 pmCPH - ORD

1 stop23h 05mBritish Airways

Deal found 4/22

$719

Last-minute flights from Illinois to Denmark
Discover last-minute flight deals from Illinois to Denmark. Data last updated April 22, 2025 and is based on user searches.

Wed 4/235:45 pmORD - CPH

1 stop19h 20mAmerican Airlines

Wed 4/307:20 amCPH - ORD

1 stop16h 40mAmerican Airlines

Deal found 4/22

$659

Wed 4/238:20 pmORD - CPH

1 stop16h 45mBritish Airways

Mon 4/289:45 pmCPH - ORD

1 stop24h 00mBritish Airways

Deal found 4/22

$661

Mon 4/282:05 pmORD - CPH

1 stop14h 20mMultiple Airlines

Mon 5/59:40 amCPH - ORD

1 stop33h 30mMultiple Airlines

Deal found 4/21

$636

Mon 4/287:15 pmORD - CPH

Nonstop8h 30mScandinavian Airlines

Mon 5/54:10 pmCPH - ORD

Nonstop9h 15mScandinavian Airlines

Deal found 4/21

$775

Mon 4/2811:25 amORD - CPH

1 stop19h 25mTurkish Airlines

Fri 5/210:25 amCPH - ORD

1 stop30h 15mTurkish Airlines

Deal found 4/21

$905

Mon 4/284:05 pmORD - CPH

2 stops20h 05mAustrian Airlines

Mon 5/58:00 pmCPH - ORD

2 stops23h 45mAustrian Airlines

Deal found 4/21

$908

Tue 4/298:25 pmORD - CPH

1 stop31h 25mAir Canada

Tue 5/1312:45 pmCPH - ORD

1 stop16h 21mAir Canada

Deal found 4/21

$642

Tue 4/292:20 pmORD - CPH

1 stop11h 35mSWISS

Sat 5/106:40 amCPH - ORD

1 stop16h 15mSWISS

Deal found 4/22

$729

Wed 4/3010:30 pmORD - BLL

1 stop17h 30mLufthansa

Tue 5/66:00 amBLL - ORD

1 stop13h 30mLufthansa

Deal found 4/21

$664

Wed 4/3010:50 amORD - CPH

2 stops14h 55mUnited Airlines

Wed 5/76:10 amCPH - ORD

2 stops15h 55mUnited Airlines

Deal found 4/20

$677

Wed 4/3010:20 amMDW - BLL

2 stops16h 15mDelta

Tue 5/66:00 amBLL - MDW

2 stops17h 12mDelta

Deal found 4/21

$679

Wed 4/309:20 amMDW - CPH

2 stops24h 45mDelta

Wed 5/76:00 amCPH - MDW

2 stops18h 45mDelta

Deal found 4/20

$686

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 22, 2025.

Fri 8/86:00 pmORD - CPH

1 stop34h 55mTAP AIR PORTUGAL

Deal found 4/22

$347

Wed 6/187:25 pmORD - CPH

1 stop19h 20mIcelandair

Deal found 4/22

$352

Mon 5/195:05 amORD - CPH

3 stops33h 40mMultiple Airlines

Deal found 4/22

$360

Fri 6/139:40 amMDW - CPH

2 stops40h 25mMultiple Airlines

Deal found 4/21

$387

Mon 4/287:25 pmORD - AAR

3 stops36h 25mMultiple Airlines

Deal found 4/21

$424

Mon 5/57:05 amORD - CPH

2 stops16h 25mDelta

Deal found 4/22

$439

Sun 5/46:30 pmORD - CPH

1 stop33h 20mAir Canada

Deal found 4/22

$441

Mon 5/58:15 pmORD - CPH

Nonstop8h 30mScandinavian Airlines

Deal found 4/22

$448

Tue 5/66:35 pmORD - BLL

1 stop31h 15mSWISS

Deal found 4/22

$454

Wed 8/61:00 pmMDW - CPH

2 stops14h 40mDelta

Deal found 4/21

$457

Thu 5/89:40 pmORD - CPH

1 stop14h 05mLufthansa

Deal found 4/21

$472

Mon 5/199:35 amORD - CPH

1 stop18h 15mUnited Airlines

Deal found 4/22

$496

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

Tue 9/23

7:25 pm-12:55 pm

1 stop10h 30m

Kastrup Copenhagen

Sat 10/4

4:45 pm-6:15 pm

1 stop32h 30m

$567

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Sun 9/14

8:00 am-7:10 am

2 stops16h 10m

Kastrup Copenhagen

Wed 9/24

12:20 pm-8:11 pm

1 stop14h 51m

$599

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Mon 5/12

3:50 pm-10:50 am

1 stop12h 00m

Kastrup Copenhagen

Mon 5/26

8:10 pm-12:10 pm

1 stop23h 00m

$603

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Mon 5/5

8:40 am-10:50 am

2 stops19h 10m

Kastrup Copenhagen

Fri 5/16

12:50 pm-7:30 pm

1 stop13h 40m

$607

ChicagoBillund

ORD - BLL

ORDBLL

Chicago O'Hare Intl

Mon 5/5

9:40 pm-11:15 pm

1 stop18h 35m

Billund

Tue 5/27

6:00 am-12:30 pm

1 stop13h 30m

$625

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Tue 5/6

6:35 pm-2:15 pm

1 stop12h 40m

Kastrup Copenhagen

Wed 5/14

9:40 am-3:55 pm

1 stop13h 15m

$625

ChicagoBillund

ORD - BLL

ORDBLL

Chicago O'Hare Intl

Mon 5/5

6:35 pm-4:25 pm

2 stops14h 50m

Billund

Tue 5/27

6:00 am-2:10 pm

1 stop15h 10m

$628

ChicagoBillund

ORD - BLL

ORDBLL

Chicago O'Hare Intl

Tue 5/6

10:40 am-2:00 pm

2 stops20h 20m

Billund

Wed 5/28

1:05 pm-6:15 pm

1 stop12h 10m

$629

ChicagoCopenhagen

MDW - CPH

MDWCPH

Chicago Midway

Tue 5/13

6:25 pm-3:45 pm

2 stops14h 20m

Kastrup Copenhagen

Wed 5/21

9:00 am-9:27 pm

2 stops19h 27m

$637

ChicagoCopenhagen

ORD - CPH

ORDCPH

Chicago O'Hare Intl

Mon 9/15

11:45 pm-6:25 pm

1 stop35h 40m

Kastrup Copenhagen

Mon 9/22

10:25 am-10:00 pm

1 stop18h 35m

$669

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/21

Showing 1-10 of 57 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 Finnair 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

7,920 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

7,920 reviews

Delta

8.0

Very good

7,920 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

1,331 reviews

Delta

8.0

Very good

7,920 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

1,272 reviews

Delta

8.0

Very good

7,920 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

1,582 reviews

Delta

8.0

Very good

7,920 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.

Air France

7.4

Good

1,441 reviews

Delta

8.0

Very good

7,920 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 $347. Icelandair flights start at $352 while deals on Delta start at $439 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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San Francisco to Heathrow flights

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Baltimore to Heathrow flights

Seattle to Heathrow flights

O'Hare Intl to Heathrow flights

Dallas/Fort Worth to Heathrow flights

Dulles Intl to Charles de Gaulle flights

LaGuardia to Leonardo da Vinci/Fiumicino flights

Newark to Dublin flights

John F Kennedy Intl to Malpensa flights

Newark to Madrid flights

O'Hare Intl to Charles de Gaulle flights

John F Kennedy Intl to Dublin flights

Newark to Malpensa flights

O'Hare Intl to Athens flights

Boston to Charles de Gaulle flights

Boston to Leonardo da Vinci/Fiumicino flights

Dallas/Fort Worth to Charles de Gaulle flights

Dulles Intl to Leonardo da Vinci/Fiumicino flights

Atlanta to Heathrow flights

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LaGuardia to Gatwick flights

LaGuardia to Athens flights

Boston to Dublin flights

Los Angeles to Charles de Gaulle flights

Top 10 airlines flying from Illinois to Denmark

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$378	Average$630	FlexibilityNo cancel fee	On-time76%
Scandinavian Airlines	Cheapest$439	Average$831	FlexibilityNo cancel fee	On-time77%
Lufthansa	Cheapest$488	Average$687	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$498	Average$676	FlexibilityNo cancel fee	On-time70%
KLM	Cheapest$501	Average$817	FlexibilityNo cancel fee	On-time75%
United Airlines	Cheapest$508	Average$680	FlexibilityNo cancel fee	On-time69%
SWISS	Cheapest$509	Average$827	FlexibilityNo cancel fee	On-time79%
Air Canada	Cheapest$521	Average$641	FlexibilityNo cancel fee	On-time67%
Finnair	Cheapest$570	Average$705	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$570	Average$686	FlexibilityNo cancel fee	On-timeN/A

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$346+ 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 8/8. Fares are subject to change and may not be available on all flights or dates of travel.

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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 22, 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 22, 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 22, 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 22, 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 Finnair 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 22, 2025.