London Heathrow
Chicago O'Hare Intl
1 stop
14h 10mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
2 stops
33h 35mMultiple Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
15h 25mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
29h 50mIcelandair
London Heathrow
Chicago O'Hare Intl
Nonstop
8h 42mFinnair
London Gatwick
Chicago O'Hare Intl
1 stop
22h 25mTurkish Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
26h 20mChicago O'Hare Intl
London Heathrow
1 stop
17h 45mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
1 stop
11h 05mChicago O'Hare Intl
London Heathrow
1 stop
18h 50mIcelandair
London Heathrow
Chicago O'Hare Intl
1 stop
16h 50mChicago O'Hare Intl
London Heathrow
1 stop
16h 05mMultiple Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
14h 40mChicago O'Hare Intl
London Heathrow
1 stop
13h 40mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
24h 20mChicago O'Hare Intl
London Heathrow
Nonstop
7h 40mFinnair
London Heathrow
Chicago O'Hare Intl
1 stop
12h 22mChicago O'Hare Intl
London Heathrow
Nonstop
7h 50mBritish Airways
January
£1,587
February
£1,480
March
£1,987
April
£1,931
May
£2,038
June
£2,087
July
£2,051
August
£1,960
September
£1,720
October
£2,147
November
£2,021
December
£1,687
At the present moment the cheapest month to fly business class to Chicago is currently February; with October being the most expensive. Prices will vary depending on multiple factors such as booking in advance, airline and departure airports and times.