Highlighted rows fall within 09:00–18:00 in both places: 3 shared working hours.
Clock changes in London and Chicago
London
British Time (GMT)
Next clock change Sun 28 Mar 2027 (UTC+0 → UTC+1)
Chicago
Central Standard Time (CST)
Next clock change Sun 14 Mar 2027 (UTC−6 → UTC−5)
Time difference between London and Chicago today
At this moment Chicago is 6 hours behind of London. When it is 09:00 in London, it is 03:00 in Chicago. London is on British Time (GMT); Chicago is on Central Standard Time (CST).
When the London to Chicago time difference changes
For most of the year Chicago is 6 hours behind of London. From 14 March to 27 March 2027, Chicago is 5 hours behind of London instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
Chicago vs London
Length
1 November 2026 to 31 December 2026
6 hours behind
61 days
1 January 2027 to 13 March 2027
6 hours behind
72 days
14 March 2027 to 27 March 2027
5 hours behind
14 days
28 March 2027 to 30 October 2027
6 hours behind
217 days
31 October 2027 to 6 November 2027
5 hours behind
7 days
7 November 2027 to 31 December 2027
6 hours behind
55 days
Best time for a meeting between London and Chicago
When Chicago is 6 hours behind of London: 2 shared office hours, 15:00 to 17:00 in London (09:00 to 11:00 in Chicago).
When Chicago is 5 hours behind of London: 3 shared office hours, 14:00 to 17:00 in London (09:00 to 12:00 in Chicago).
Frequently asked questions about London and Chicago time
What time is it in Chicago when it is 9:00 AM in London?
03:00 today; Chicago is 6 hours behind of London.
Does the time difference between London and Chicago change?
Yes. It is usually 6 hours behind, but changes when one side moves its clocks: 5 hours behind from 14 March to 27 March 2027; 5 hours behind from 31 October to 6 November 2027.