London City
Chicago O'Hare Intl
2 stops
19h 35mMultiple Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
14h 00mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
1 stop
19h 10mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
26h 50mIcelandair
London Heathrow
Chicago O'Hare Intl
Nonstop
8h 40mFinnair
London Gatwick
Chicago O'Hare Intl
1 stop
22h 25mTurkish Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
16h 10mChicago O'Hare Intl
London Heathrow
1 stop
18h 50mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
1 stop
11h 15mChicago O'Hare Intl
London Heathrow
1 stop
10h 25mIcelandair
London Heathrow
Chicago O'Hare Intl
1 stop
14h 40mChicago O'Hare Intl
London Heathrow
1 stop
18h 20mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
11h 40mChicago O'Hare Intl
London Heathrow
1 stop
10h 15mAer Lingus
London Heathrow
Chicago O'Hare Intl
Nonstop
8h 40mChicago O'Hare Intl
London Heathrow
Nonstop
7h 50mFinnair
London Heathrow
Chicago O'Hare Intl
2 stops
38h 00mChicago O'Hare Intl
London Heathrow
1 stop
10h 25mMultiple Airlines
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.