Time difference between Chicago and London
London is currently 6 hours ahead of Chicago. The best shared working window is 14:00–16:00 UTC — 2 hours a day. The table below shows the hours side by side.
National conventions are the default and the public figure. Change them here for your own answer — the chart, the window and the calendar file all follow.
Not on that day. Saturday is a rest day in both Chicago and London. The hours above are what you would share on a day you are both at work.
09:00 Chicago At work = 15:00 London At work
Tap any hour to read it in both cities.
The difference changes twice a year
Chicago and London do not change their clocks on the same dates, so a standing meeting moves by an hour in these weeks.
- 25 October – 31 October +5 h
- 14 March – 27 March +5 h
- usually +6 h
Days when one side is not at work
A public holiday is not a time-zone fact, so no converter shows it — but it is the same question.
- 12 October — Columbus Day Chicago off
- 11 November — Veterans Day Chicago off
- 26 November — Thanksgiving Day Chicago off
- 28 December — Boxing Day (substitute day) London off
- 18 January — Martin Luther King Jr. Day Chicago off
Hour by hour
| 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 | both at work |
| 10:00 | 16:00 | both at work |
| 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 |
The difference adjusts automatically for daylight saving in both Chicago and London.
The working week
- Chicago
- 09:00 to 17:00, Monday, Tuesday, Wednesday, Thursday, Friday.
- London
- 09:00 to 17:00, Monday, Tuesday, Wednesday, Thursday, Friday.
Sources and last check
Times, offsets and sun positions on this page are computed live from the IANA timezone database and the NOAA solar algorithm, so they do not depend on the review dates below.
- Working hours and weekend days for 55 countries
- Source: Published national labour conventions and government working-hours guidance. Last checked, reviewed every 12 months.
Not covered:A national convention, not any given employer. Countries not listed fall back to a nine-to-five, Monday to Friday default, and pages say so rather than implying we checked.
FAQ
How many hours between Chicago and London?
London is 6 hours ahead of Chicago (+6 hours).
When is the best time for a meeting?
Around 14:00–16:00 UTC, when both working days overlap — Chicago works 09:00–17:00 and London works 09:00–17:00, each in their own local time.