London Heathrow
Chicago O'Hare Intl
2 stops
51h 35mMultiple Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
14h 15mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
1 stop
15h 25mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
26h 50mIcelandair
London Heathrow
Chicago O'Hare Intl
1 stop
27h 55mAir Serbia
London Gatwick
Chicago O'Hare Intl
1 stop
17h 10mTurkish Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
11h 05mChicago O'Hare Intl
London Heathrow
1 stop
10h 20mIcelandair
London Heathrow
Chicago O'Hare Intl
1 stop
27h 25mChicago O'Hare Intl
London Heathrow
1 stop
17h 45mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
1 stop
15h 25mChicago O'Hare Intl
London Heathrow
1 stop
18h 20mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
21h 35mChicago O'Hare Intl
London Heathrow
Nonstop
8h 05mLufthansa
Manchester
Chicago O'Hare Intl
2 stops
27h 30mChicago O'Hare Intl
Manchester
1 stop
17h 25mScandinavian Airlines
London City
Chicago O'Hare Intl
1 stop
13h 10mChicago O'Hare Intl
London City
1 stop
10h 40mMultiple Airlines
January
£1,586
February
£1,480
March
£1,987
April
£1,931
May
£2,044
June
£2,087
July
£2,062
August
£1,962
September
£2,001
October
£2,033
November
£2,021
December
£1,798
At the present moment the cheapest month to fly business class to Chicago is currently February; with June being the most expensive. Prices will vary depending on multiple factors such as booking in advance, airline and departure airports and times.