Chicago and London working-hours overlap
On Monday, 28 September 2026, Chicago is 6 hours behind London — UTC-05:00 against UTC+01:00. Their working hours overlap for 2 hours that day, between 14:00–16:00 UTC — 09:00–11:00 in Chicago and 15:00–17:00 in London. Chicago changes clocks on Sunday, 1 November 2026, and the gap between them goes from 5 hours to 6 hours. London changes clocks on Sunday, 25 October 2026, and the gap between them goes from 6 hours to 5 hours.
Every figure on this page describes Monday, 28 September 2026 — a fixed day, not the day you are reading it. Working hours are 09:00–17:00 local time for both cities; change either, or pick another date, in the overlap calculator.
Shared working hours
Everyone is at work between 14:00–16:00 UTC — 2 hours.
| City | Local time | Offset |
|---|---|---|
| Chicago | 09:00–11:00 | UTC-05:00 |
| London | 15:00–17:00 | UTC+01:00 |
Each city's working day
| City | Local hours | In UTC | Offset | Next clock change |
|---|---|---|---|---|
| Chicago | 09:00–17:00 | 14:00–22:00 UTC | UTC-05:00 | UTC-05:00 → UTC-06:00, 1 Nov 2026 |
| London | 09:00–17:00 | 08:00–16:00 UTC | UTC+01:00 | UTC+01:00 → UTC+00:00, 25 Oct 2026 |
How the shared window moves through the year
Chicago and London change clocks on different dates, so the gap between them moves twice a year. Each row is the same pair of working days, sampled once a month, so the window's size and position follow the clock changes described above.
| Month | Shared window | Length |
|---|---|---|
| 2026-10 | 14:00–16:00 UTC | 2 hours |
| 2026-11 | 15:00–17:00 UTC | 2 hours |
| 2026-12 | 15:00–17:00 UTC | 2 hours |
| 2027-01 | 15:00–17:00 UTC | 2 hours |
| 2027-02 | 15:00–17:00 UTC | 2 hours |
| 2027-03 | 14:00–17:00 UTC | 3 hours |
| 2027-04 | 14:00–16:00 UTC | 2 hours |
| 2027-05 | 14:00–16:00 UTC | 2 hours |
| 2027-06 | 14:00–16:00 UTC | 2 hours |
| 2027-07 | 14:00–16:00 UTC | 2 hours |
| 2027-08 | 14:00–16:00 UTC | 2 hours |
| 2027-09 | 14:00–16:00 UTC | 2 hours |
Questions
- What time can Chicago and London meet?
- 14:00–16:00 UTC on Monday, 28 September 2026 — 2 hours. In Chicago that is 09:00–11:00, and in London it is 15:00–17:00.
- How far apart are Chicago and London?
- On Monday, 28 September 2026, Chicago is 6 hours behind London — UTC-05:00 against UTC+01:00. Chicago changes clocks on Sunday, 1 November 2026, and the gap between them goes from 5 hours to 6 hours. London changes clocks on Sunday, 25 October 2026, and the gap between them goes from 6 hours to 5 hours.
- Does the overlap between Chicago and London change through the year?
- Chicago and London change clocks on different dates, so the gap between them moves twice a year. Sampled once a month across the twelve months from Monday, 28 September 2026 the window is 14:00–16:00 UTC, 15:00–17:00 UTC, 14:00–17:00 UTC.
Related city pairs
- Honolulu and Chicago
- Honolulu and London
- San Francisco and Chicago
- San Francisco and London
- Denver and Chicago
- Denver and London
Or read how overlap is calculated and the other questions people ask about scheduling across time zones.