What is the cheapest airline that flies from Illinois to Cologne Köln/Bonn?

Turkish Airlines is the most popular carrier operating from Illinois to Cologne Köln/Bonn

What airlines fly to Cologne?

Lufthansa, United Airlines and Aer Lingus are the top three most popular airlines that fly to Cologne from Illinois according to our data. Lufthansa is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Cologne. Keep in mind that there are 12 different airlines that fly to Cologne on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Illinois to Cologne Köln/Bonn Airport?

Prices for flights from Illinois to Cologne Köln/Bonn Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Illinois to Cologne Köln/Bonn Airport?

As of December 2025, there is 1 operator available to choose from for flights from Illinois to Cologne Köln/Bonn Airport.

How old do you have to be to fly from Illinois to Cologne Köln/Bonn Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Cologne Köln/Bonn Airport.

What documentation or ID do you need to fly to Cologne Köln/Bonn Airport?

The travel and health documents you'll need for your trip to Cologne Köln/Bonn Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Cologne Köln/Bonn Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$307 Cheap Flights from Illinois to Cologne in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Illinois to Cologne

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:39 am - 12:35 pm

STL

CGN

17h 56m2 stops

1:15 pm - 10:59 pm

CGN

STL

16h 44m2 stops

$558Lufthansa

Tue, Feb 24 - Sun, Mar 1

4:05 pm - 12:10 pm

STL

CGN

13h 05m2 stops

1:20 pm - 10:58 pm

CGN

STL

16h 38m2 stops

$574Multiple Airlines

Wed, Feb 4 - Wed, Feb 11

4:05 pm - 12:10 pm

STL

CGN

37h 05m2 stops

1:20 pm - 11:51 pm

CGN

STL

16h 31m2 stops

$579Multiple Airlines

Thu, Mar 5 - Mon, Mar 16

4:05 pm - 12:10 pm

STL

CGN

13h 05m2 stops

1:40 pm - 3:29 pm

CGN

STL

32h 49m2 stops

$585Air Canada

Wed, Feb 4 - Sun, Feb 8

8:20 pm - 10:35 am

ORD

CGN

31h 15m1 stop

6:15 pm - 6:25 pm

CGN

ORD

31h 10m1 stop

$593Turkish Airlines

Fri, Feb 20 - Sun, Feb 22

11:50 am - 10:35 am

ORD

CGN

15h 45m1 stop

11:35 am - 6:25 pm

CGN

ORD

37h 50m1 stop

$619Turkish Airlines

Wed, Feb 4 - Wed, Feb 11

8:37 am - 4:10 pm

ORD

CGN

24h 33m2 stops

5:15 pm - 6:02 pm

CGN

ORD

31h 47m2 stops

$649British Airways

Wed, Feb 11 - Wed, Feb 18

9:45 pm - 4:10 pm

ORD

CGN

11h 25m1 stop

5:15 pm - 6:02 pm

CGN

ORD

31h 47m2 stops

$652British Airways

Wed, Feb 11 - Wed, Feb 18

5:25 pm - 3:40 pm

ORD

CGN

39h 15m2 stops

5:15 pm - 1:50 pm

CGN

ORD

27h 35m1 stop

$696British Airways

Wed, Feb 4 - Wed, Feb 11

4:05 pm - 12:10 pm

STL

CGN

13h 05m2 stops

8:40 am - 9:07 pm

CGN

STL

18h 27m3 stops

$900Air Canada

Thu, Mar 5 - Mon, Mar 16

Turkish Airlines flights from Illinois to Cologne

Our best Turkish Airlines deals on Illinois to Cologne flight tickets

Turkish Airlines

Feb 20

ORD8:20 pmChicago O'Hare Intl

31h 15m

1 stop

CGN10:35 amCologne Köln/Bonn

Feb 22

CGN6:15 pmCologne Köln/Bonn

31h 10m

1 stop

ORD6:25 pmChicago O'Hare Intl

$593

Find similar

Turkish Airlines

Feb 4

ORD11:50 amChicago O'Hare Intl

15h 45m

1 stop

CGN10:35 amCologne Köln/Bonn

Feb 11

CGN11:35 amCologne Köln/Bonn

37h 50m

1 stop

ORD6:25 pmChicago O'Hare Intl

$619

Find similar

Turkish Airlines

Feb 5

ORD8:20 pmChicago O'Hare Intl

31h 15m

1 stop

CGN10:35 amCologne Köln/Bonn

Feb 12

CGN6:15 pmCologne Köln/Bonn

31h 10m

1 stop

ORD6:25 pmChicago O'Hare Intl

$650

Find similar

British Airways flights from Illinois to Cologne

Our best British Airways deals on Illinois to Cologne flight tickets

British Airways

Feb 11

ORD8:37 amChicago O'Hare Intl

24h 33m

2 stops

CGN4:10 pmCologne Köln/Bonn

Feb 18

CGN5:15 pmCologne Köln/Bonn

31h 47m

2 stops

ORD6:02 pmChicago O'Hare Intl

$649

Find similar

British Airways

Feb 11

ORD9:45 pmChicago O'Hare Intl

11h 25m

1 stop

CGN4:10 pmCologne Köln/Bonn

Feb 18

CGN5:15 pmCologne Köln/Bonn

31h 47m

2 stops

ORD6:02 pmChicago O'Hare Intl

$652

Find similar

British Airways

Feb 4

ORD5:25 pmChicago O'Hare Intl

39h 15m

2 stops

CGN3:40 pmCologne Köln/Bonn

Feb 11

CGN5:15 pmCologne Köln/Bonn

27h 35m

1 stop

ORD1:50 pmChicago O'Hare Intl

$696

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisCologne

STL - CGN

STLCGN

Lambert-St Louis

Tue 2/24

11:39 am-12:35 pm

2 stops17h 56m

Cologne Köln/Bonn

Sun 3/1

1:15 pm-10:59 pm

2 stops16h 44m

$558

St. LouisCologne

STL - CGN

STLCGN

Lambert-St Louis

Wed 2/4

4:05 pm-12:10 pm

2 stops13h 05m

Cologne Köln/Bonn

Wed 2/11

1:20 pm-10:58 pm

2 stops16h 38m

$574

St. LouisCologne

STL - CGN

STLCGN

Lambert-St Louis

Thu 3/5

4:05 pm-12:10 pm

2 stops37h 05m

Cologne Köln/Bonn

Mon 3/16

1:20 pm-11:51 pm

2 stops16h 31m

$579

St. LouisCologne

STL - CGN

STLCGN

Lambert-St Louis

Wed 2/4

4:05 pm-12:10 pm

2 stops13h 05m

Cologne Köln/Bonn

Sun 2/8

1:40 pm-3:29 pm

2 stops32h 49m

$585

ChicagoCologne

ORD - CGN

ORDCGN

Chicago O'Hare Intl

Fri 2/20

8:20 pm-10:35 am

1 stop31h 15m

Cologne Köln/Bonn

Sun 2/22

6:15 pm-6:25 pm

1 stop31h 10m

$593

ChicagoCologne

ORD - CGN

ORDCGN

Chicago O'Hare Intl

Wed 2/4

11:50 am-10:35 am

1 stop15h 45m

Cologne Köln/Bonn

Wed 2/11

11:35 am-6:25 pm

1 stop37h 50m

$619

ChicagoCologne

ORD - CGN

ORDCGN

Chicago O'Hare Intl

Wed 2/11

8:37 am-4:10 pm

2 stops24h 33m

Cologne Köln/Bonn

Wed 2/18

5:15 pm-6:02 pm

2 stops31h 47m

$649

ChicagoCologne

ORD - CGN

ORDCGN

Chicago O'Hare Intl

Wed 2/11

9:45 pm-4:10 pm

1 stop11h 25m

Cologne Köln/Bonn

Wed 2/18

5:15 pm-6:02 pm

2 stops31h 47m

$652

ChicagoCologne

ORD - CGN

ORDCGN

Chicago O'Hare Intl

Wed 2/4

5:25 pm-3:40 pm

2 stops39h 15m

Cologne Köln/Bonn

Wed 2/11

5:15 pm-1:50 pm

1 stop27h 35m

$696

St. LouisCologne

STL - CGN

STLCGN

Lambert-St Louis

Thu 3/5

4:05 pm-12:10 pm

2 stops13h 05m

Cologne Köln/Bonn

Mon 3/16

8:40 am-9:07 pm

3 stops18h 27m

$900

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois to Cologne

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Cologne?

The cheapest month to fly to Cologne from Illinois is in February. Flight prices, which tend to average around $579, are often lower during this time because this is during the off-season. If you are unable to visit Cologne during the month of February, then departing from Illinois during the month March is also very affordable. Most momondo users find prices during this month for around $643.

What is the cheapest day to depart on your flight to Cologne?

The cheapest day to depart from Illinois to Cologne is on a Thursday when prices can be found for as low as $872. On the other hand, Monday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,547.

What is the cheapest time of day to depart on your flight to Cologne?

The cheapest time of day to fly to Cologne is in the morning when flights can be purchased for as low as $879. In the afternoon is when there is more demand to fly to Cologne, so prices are often more expensive at around $1,181 per ticket.

Cheap Illinois to Cologne flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Cologne

Fastest flight time	10h 55m
Direct flights	None

The fastest flight from Illinois to Cologne takes 10h 55m

There are no direct flights from Illinois to Cologne. There are no popular flight routes from Illinois to Cologne.

Search flight deals

When did momondo last update prices for flights from Illinois to Cologne Köln/Bonn Airport?
Prices for flights from Illinois to Cologne Köln/Bonn Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Illinois to Cologne Köln/Bonn Airport?
As of December 2025, there is 1 operator available to choose from for flights from Illinois to Cologne Köln/Bonn Airport.
How old do you have to be to fly from Illinois to Cologne Köln/Bonn Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Cologne Köln/Bonn Airport.
What documentation or ID do you need to fly to Cologne Köln/Bonn Airport?
The travel and health documents you'll need for your trip to Cologne Köln/Bonn Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Cologne Köln/Bonn Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Illinois to Cologne

Compare and see reviews for airlines that fly from Illinois to Cologne with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom $584	Free Cancellation	Rating 6.7 7,602 reviews		Search British Airways flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Cologne?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Cologne. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to Cologne with flexible booking policies on momondo?

momondo does allow users to show only those flights to Cologne from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to Cologne?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Cologne from Illinois.

I’m not ready to book a flight from Illinois to Cologne right now. Can momondo alert me if prices change?

Price alerts on flights to Cologne from Illinois are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.