Time difference between Chicago and London
Chicago and London are in different time zones. Below, you'll find the current time in both cities, the exact time difference, and a suggestion for when it's convenient to call.
London is 6 hr ahead of Chicago
When to call
Working hours (9:00–18:00) in both cities overlap from 09:00 to 12:00 in Chicago time.
Hour-by-hour comparison
On the left is the time in Chicago; on the right, the corresponding time in London.
| Chicago | London |
|---|---|
| 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 | 00:00 |
| 19:00 | 01:00 |
| 20:00 | 02:00 |
| 21:00 | 03:00 |
| 22:00 | 04:00 |
| 23:00 | 05:00 |
Time zones
| Chicago — Time zone | America/Chicago |
| Chicago — UTC offset | UTC-5 |
| London — Time zone | Europe/London |
| London — UTC offset | UTC+1 |
Frequently asked questions
How many hours is Chicago ahead of or behind London?
The current difference is 6 hr. It may change twice a year if the clocks are changed in either city.
Does the time difference change during the year?
Yes, if daylight saving time is observed in at least one of the cities. The values on this page are recalculated automatically.
When is the best time to call?
See the “When to call” section above: it shows the overlap between the working hours of both cities.
Calculated using the IANA time zone database. Daylight saving time is taken into account automatically.