Time difference between London and Chicago

Updated live in your browser · IANA time zone database (Europe/London, America/Chicago)

London BST · UTC+1

Chicago CDT · UTC-5

Difference 6 hours — Chicago is behind London

Best time to call

Hours shown in London time. The working-day overlap runs 3:00 PM – 5:00 PM in London, which is 9:00 AM – 11:00 AM in Chicago — schedule calls in that window.

Hour-by-hour conversion

Daylight saving time note

London and Chicago do not change their clocks on the same date. Between October 25, 2026 and November 1, 2026 the difference is 5 hours ahead of Chicago — because London and Chicago switch daylight saving time on different dates.

For the rest of the year the difference holds steady at 6 hours. Every time on this page is computed from the IANA database at the moment you load it, so the tables above already account for whichever side has switched.

Why the time difference exists

Related comparisons

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• London ↔ San Francisco