Chicago to London: time difference and meeting times
Everything you need to schedule between Chicago and London — the current offset, both cities' daylight saving dates, and the hour-by-hour overlap of their working days.
3 hours of full overlap. Both cities are inside normal working hours (09:00–17:59 local) at 14:00–17:00 UTC. Any hour in that range works for both sides without anyone starting early or finishing late.
Hour by hour
| UTC | Chicago | Status | London | Status |
|---|---|---|---|---|
| 00:00 | 19:00 prev day | Evening | 01:00 | Asleep |
| 01:00 | 20:00 prev day | Evening | 02:00 | Asleep |
| 02:00 | 21:00 prev day | Late night | 03:00 | Asleep |
| 03:00 | 22:00 prev day | Late night | 04:00 | Asleep |
| 04:00 | 23:00 prev day | Late night | 05:00 | Asleep |
| 05:00 | 00:00 | Asleep | 06:00 | Early morning |
| 06:00 | 01:00 | Asleep | 07:00 | Early morning |
| 07:00 | 02:00 | Asleep | 08:00 | Early morning |
| 08:00 | 03:00 | Asleep | 09:00 | Working hours |
| 09:00 | 04:00 | Asleep | 10:00 | Working hours |
| 10:00 | 05:00 | Asleep | 11:00 | Working hours |
| 11:00 | 06:00 | Early morning | 12:00 | Working hours |
| 12:00 | 07:00 | Early morning | 13:00 | Working hours |
| 13:00 | 08:00 | Early morning | 14:00 | Working hours |
| 14:00 | 09:00 | Working hours | 15:00 | Working hours |
| 15:00 | 10:00 | Working hours | 16:00 | Working hours |
| 16:00 | 11:00 | Working hours | 17:00 | Working hours |
| 17:00 | 12:00 | Working hours | 18:00 | Evening |
| 18:00 | 13:00 | Working hours | 19:00 | Evening |
| 19:00 | 14:00 | Working hours | 20:00 | Evening |
| 20:00 | 15:00 | Working hours | 21:00 | Late night |
| 21:00 | 16:00 | Working hours | 22:00 | Late night |
| 22:00 | 17:00 | Working hours | 23:00 | Late night |
| 23:00 | 18:00 | Evening | 00:00 next day | Asleep |
Green rows are hours when both cities are inside core working hours (09:00–17:59 local). Amber rows are hours when both are awake but at least one is in the early morning or evening. Times shown are for 27 August 2026; the pattern shifts when either city changes its clocks.
Quick conversions
| When it is… | …it is |
|---|---|
| 09:00 in Chicago | 15:00 in London |
| 12:00 in Chicago | 18:00 in London |
| 15:00 in Chicago | 21:00 in London |
| 17:00 in Chicago | 23:00 in London |
Daylight saving
Chicago next moves its clocks back on 1 November 2026, to UTC−6. London next moves its clocks back on 25 October 2026, to UTC+0.
Both sides change clocks, but not on the same dates
Both cities observe daylight saving, so the offset between them is stable for most of the year. It is not stable during the weeks when one has changed and the other has not — check the transition dates above before scheduling anything in those windows.
Scheduling across this corridor
The transatlantic corridor is the most forgiving of the long-haul pairings, and the only one where a genuine shared working day exists. The window is real but narrow: it opens when the US East Coast starts work and closes when Europe goes home, which in practice means the early afternoon in Europe and the morning in New York. The complication is not the offset itself — it is that the two regions change their clocks on different dates, so the gap silently widens or narrows for a couple of weeks each spring and autumn.
About Chicago
Chicago anchors US Central Time, an hour behind the East Coast and the zone covering most of the American interior. For international scheduling it behaves like a slightly softer version of New York — an hour further from Europe, an hour closer to Asia. It observes the standard US daylight saving dates.
About London
London is the practical reference point for global scheduling, sitting at UTC in winter and an hour ahead of it in summer. That is precisely why UTC and London time are not the same thing for most of the year, and why "GMT" used loosely between April and October is usually wrong. British Summer Time runs from the last Sunday in March to the last Sunday in October, on the EU schedule rather than the American one.
Add more cities
This page covers two cities. If your team spans three or more, open the interactive grid — it shows every city's working hours side by side and highlights the columns where everyone overlaps.
◎ Open Chicago and London in the grid
Related time differences
Intl API and were last generated on 27 August 2026. See how we calculate these figures.