Best Meeting Time: London to Chicago
🕐 Live Timezone Overlap: London & Chicago
London and Chicago sit six hours apart, with London always ahead. Both cities observe daylight saving time, but US and UK clocks change on different weekends in March and autumn, briefly creating a five-hour gap. That one-week mismatch catches many schedulers off-guard. The 3-hour overlap between London's afternoon and Chicago's morning means careful planning is essential. London's financial district aligns its afternoon to New York's open at 2:30pm GMT, and Chicago trading desks start at 7am Central, so institutional teams often find themselves squeezed into a narrow window.
Time Difference: London and Chicago
Chicago is currently 6 hours behind London. The live offsets are London UTC+1 and Chicago UTC-5. London observes daylight saving and Chicago also observes daylight saving, so the offset shifts twice a year if both sides aren't already aligned.
London operates on UTC+0 in winter and UTC+1 in summer. Chicago runs UTC−6 in winter and UTC−5 in summer. Both cities observe DST, but the UK changes clocks one week earlier than the US each autumn, creating a temporary five-hour offset before American clocks fall back. In spring the pattern reverses: US clocks advance first, again producing a brief five-hour window before the UK follows.
Best Times to Meet
The 3-hour overlap runs 3pm–6pm London and 9am–noon Chicago. Inside that 3-hour window, the cleanest slot is typically 3pm–4pm London (9am–10am Chicago), catching Chicago teams fresh and London workers before the day winds down. Avoid scheduling after 5pm London on Fridays; UK offices often empty by 4pm. Chicago trading desks open at 7am Central, so finance teams there may prefer an 8am start, which lands at 2pm London and sits just outside standard overlap.
Working Hours Overlap Explained
London operates on Europe/London (currently UTC+1). Chicago operates on America/Chicago (currently UTC-5). The table below maps a standard 9:00 AM–6:00 PM day in London to Chicago's local time.
| London time | Chicago time | Status |
|---|---|---|
| 9:00 AM | 3:00 AM | Chicago outside hours |
| 10:00 AM | 4:00 AM | Chicago outside hours |
| 11:00 AM | 5:00 AM | Chicago outside hours |
| 12:00 PM | 6:00 AM | Chicago outside hours |
| 1:00 PM | 7:00 AM | Chicago outside hours |
| 2:00 PM | 8:00 AM | Chicago just starting |
| 3:00 PM | 9:00 AM | Chicago in business hours |
| 4:00 PM | 10:00 AM | Chicago in business hours |
| 5:00 PM | 11:00 AM | Chicago in business hours |
| 6:00 PM | 12:00 PM | Chicago in business hours |
Tips for Scheduling Across London and Chicago
- London finance teams align to New York's 2:30pm GMT open, so book London–Chicago calls before 2pm London when possible.
- Chicago winters drive remote-work spikes December through February; confirm attendance before scheduling in-person events those months.
- UK clocks change one week earlier than US clocks each autumn, creating a brief four-hour offset to Chicago.
- Fridays wind down by 4pm in London; schedule recurring weeklies on Tuesday or Wednesday to avoid no-shows.
- Chicago sits one hour behind New York and two ahead of LA, so three-way calls often land mid-afternoon London time.
Public Holidays and Working Weeks
Both cities follow a Monday-to-Friday working week with 9am–6pm core hours. London's next major public holiday is New Year's Day on 1 January; Chicago observes Independence Day on 4 July. US Thanksgiving (fourth Thursday in November) and UK May Bank Holiday (first Monday in May) do not coincide, so cross-city teams should check both calendars before booking quarterly reviews or sprints.