The time difference is usually −6 hours. For a few weeks in spring and autumn it is −5 hours, because the two places change their clocks on different dates. When it is 12:00 PM (noon) in London, it is 6:00 AM in Chicago.
Changes during 2026
- Sunday, 8 March 2026: −5 hours
- Sunday, 29 March 2026: −6 hours
- Sunday, 25 October 2026: −5 hours
- Sunday, 1 November 2026: −6 hours
Conversion table
| London | Chicago |
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Green: between 8 AM and 8 PM in both places – ideal for calls and meetings.