Chicago time to London time
London is 6 hours ahead of Chicago all year (Chicago GMT-5/UTC−05:00 in summer; London BST/UTC+01:00). Enter a Chicago time below to convert it, or leave it blank to see the current time in both cities.
How to use the Chicago to London time
- Type a Chicago time (24-hour) and optionally a date, or leave blank for now.
- Click Convert.
- Read the London time and the working-hours table.
Time difference between Chicago and London
London is 6 hours ahead of Chicago all year. Both Chicago and London observe daylight saving time, but they change clocks on different dates, so for a few weeks each spring and autumn the difference shifts by an hour. Chicago uses America/Chicago time (UTC−06:00 in January, UTC−05:00 in July); London uses Europe/London (UTC+00:00 in January, UTC+01:00 in July).
Working week in Chicago and London
Chicago: Central Time, one hour behind New York: CDT (UTC−5) in summer, CST (UTC−6) in winter. Weekend Saturday–Sunday.
London: Office hours 09:00–17:30, weekend Saturday–Sunday. Clocks go forward on the last Sunday of March (BST, UTC+1) and back on the last Sunday of October (GMT).
Quick conversion table (summer difference)
| Chicago | London |
|---|---|
| 08:00 | 14:00 |
| 09:00 | 15:00 |
| 10:00 | 16:00 |
| 12:00 | 18:00 |
| 14:00 | 20:00 |
| 16:00 | 22:00 |
| 18:00 | 00:00 (next day) |
| 20:00 | 02:00 (next day) |
| 22:00 | 04:00 (next day) |
Table uses the July difference; the tool above applies the exact rule for any date.
Best time to call between Chicago and London
Within normal office hours (09:00–18:00) in both cities: 9:00–11:00 Chicago time. For a compromise outside that window, the fairest slots are the ones nearest each side's start or end of day, alternating who takes the inconvenient hour.
Reverse
Need the other direction? See London to Chicago, or the general time zone converter.
Frequently asked questions
How many hours ahead is London from Chicago?
London is 6 hours ahead of Chicago all year.
When it is 12:00 noon in Chicago, what time is it in London?
18:00 in summer (); use the tool for a specific date.
Does the converter handle daylight saving?
Yes, for the exact date you enter, using the IANA time-zone rules in your browser.
Privacy
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Last updated 2026-09-23.