Convert Chicago time to London time

Hour by hour

Every hour of a day in Chicago, and what the clock reads in London at that same moment.

Daylight saving time

Chicago and London both observe daylight saving. Where their change dates differ, so does the gap between them for the weeks in between.

When you can actually talk

The window is 3 hours wide — 09:00–12:00 in Chicago, 15:00–18:00 in London.

• Chicago 09:00–12:00London 15:00–18:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Chicago and London?

London is 6 hours ahead of Chicago. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call London from Chicago?

Between 09:00–12:00 in Chicago, which is 15:00–18:00 in London. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Chicago observe daylight saving time?

Yes. Chicago runs on UTC-6 in winter and UTC-5 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

Does London observe daylight saving time?

Yes. London runs on UTC+0 in winter and UTC+1 in summer. The next change is on 2026-10-25, when clocks go back by 60 minutes.

If it is midday in Chicago, what time is it in London?

It is 18:00 in London, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Chicago and London use?

Chicago uses America/Chicago, currently UTC-5 (CDT), and London uses Europe/London, currently UTC+1 (BST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.