Live · calculated from the IANA time-zone database
Time difference between Chicago and London
Short answer
London is 6 hours ahead of Chicago. Right now it is 07:34 in Chicago (CDT, UTC−5) and 13:34 in London (GMT+1, UTC+1).
Right now
Chicago · United States
07:34
Tuesday, September 15, 2026
Central Daylight Time · CDT · UTC−5
London · United Kingdom
13:34
Tuesday, September 15, 2026
British Summer Time · GMT+1 · UTC+1
Times at the moment this page was generated. Reload for a fresh reading.
Does the difference between Chicago and London change during the year?
Yes. For 337 days of 2026 the difference is 6 hours, but it moves whenever Chicago or London enters or leaves daylight saving time. Here is the full 2026 calendar (dates in UTC):
| From | Until | London vs Chicago |
|---|---|---|
| January 1 | March 8 | +6 h |
| March 8 | March 29 | +5 h |
| March 29 | October 25 | +6 h |
| October 25 | November 1 | +5 h |
| November 1 | December 31 | +6 h |
The highlighted row is the current period. Every date comes from each zone's official rules, not from a hand-typed table.
Best time to call London from Chicago (and vice versa)
The window in which both cities are inside their 9:00–17:00 working day runs from 09:00 to 11:00 in Chicago, which is 15:00 to 17:00 in London: 2 hours of overlap per day. For a call that disturbs nobody, aim for the middle of that window.
Outside that window, the practical rule: mornings in London are afternoons in Chicago. Avoid any hour that falls before 8:00 or after 21:00 in either city.
Chicago to London conversion table
Each Chicago hour and its equivalent in London today. Rows shaded green are working hours (9:00–17:00) in both cities at once.
| Chicago time · Tue, Sep 15 | London time |
|---|---|
| 00:00 | 06:00 |
| 01:00 | 07:00 |
| 02:00 | 08:00 |
| 03:00 | 09:00 |
| 04:00 | 10:00 |
| 05:00 | 11:00 |
| 06:00 | 12:00 |
| 07:00 | 13:00 |
| 08:00 | 14:00 |
| 09:00 | 15:00 |
| 10:00 | 16:00 |
| 11:00 | 17:00 |
| 12:00 | 18:00 |
| 13:00 | 19:00 |
| 14:00 | 20:00 |
| 15:00 | 21:00 |
| 16:00 | 22:00 |
| 17:00 | 23:00 |
| 18:00 | 00:00next day |
| 19:00 | 01:00next day |
| 20:00 | 02:00next day |
| 21:00 | 03:00next day |
| 22:00 | 04:00next day |
| 23:00 | 05:00next day |
Looking for it the other way round? This page covers both directions: London to Chicago is the same difference with the sign flipped.
The two time zones
Chicago — America/Chicago
Chicago follows Central Time (CT): UTC−6 in winter (CST) and UTC−5 in summer (CDT), shared with Dallas, Houston and most of the US Midwest and South.
London — Europe/London
London sits on the Greenwich meridian: GMT (UTC+0) in winter and British Summer Time (UTC+1) from the last Sunday of March to the last Sunday of October.
Frequently asked questions
How many hours difference between Chicago and London?
London is 6 hours ahead of Chicago. For most of the year (337 days) the difference is 6 hours; it shifts during the weeks when one of the two cities enters or leaves daylight saving time.
When it is 12:00 noon in Chicago, what time is it in London?
18:00 in London (at today's difference of 6 hours).
What is the best time for a meeting between Chicago and London?
Between 09:00 and 11:00 in Chicago, which is 15:00–17:00 in London: 2 hours of overlap inside both cities' 9:00–17:00 working day.
Do Chicago and London observe daylight saving time?
Chicago: yes. London: yes. Both change, but not necessarily on the same dates — see the transitions section on this page.
What time zone is Chicago in? And London?
Chicago: Central Daylight Time (America/Chicago, UTC−5). London: British Summer Time (Europe/London, UTC+1).
Tools
Meeting grid — add both cities and click a slot
Time zone converter — any city, any time
Working hours overlap calculator
Daylight saving time 2027 — all dates
More time differences from Chicago
More time differences from London
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