London City
Chicago O'Hare Intl
2 stops
32h 20mMultiple Airlines
London Gatwick
Chicago O'Hare Intl
1 stop
11h 15mIcelandair
London Heathrow
Chicago O'Hare Intl
1 stop
14h 40mLOT
London Heathrow
Chicago O'Hare Intl
1 stop
11h 10mBrussels Airlines
London Gatwick
Chicago O'Hare Intl
2 stops
48h 55mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
Nonstop
9h 10mAustrian Airlines
London Gatwick
Chicago O'Hare Intl
1 stop
11h 20mChicago O'Hare Intl
London Gatwick
1 stop
10h 25mIcelandair
London Heathrow
Chicago O'Hare Intl
1 stop
26h 25mChicago O'Hare Intl
London Heathrow
1 stop
12h 45mTAP AIR PORTUGAL
London Heathrow
Chicago O'Hare Intl
2 stops
14h 25mChicago O'Hare Intl
London Heathrow
1 stop
18h 50mMultiple Airlines
London Heathrow
Chicago O'Hare Intl
1 stop
14h 03mChicago O'Hare Intl
London Heathrow
Nonstop
8h 00mLufthansa
London Heathrow
Chicago O'Hare Intl
1 stop
19h 10mChicago O'Hare Intl
London Heathrow
1 stop
13h 40mLOT
London Heathrow
Chicago O'Hare Intl
Nonstop
8h 40mChicago O'Hare Intl
London Heathrow
Nonstop
7h 50mFinnair
January
£1,587
February
£1,480
March
£1,987
April
£1,931
May
£1,994
June
£2,087
July
£2,042
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.