Chicago to London time converter
London is usually 6 hours ahead of Chicago, but the gap changes around daylight saving dates. Pick a date and time below, or use the tables to plan a call.
London is 6 hours ahead of Chicago.
Live from your device clock using your browser’s time zone data.
- 9:00 AM in Chicago is3:00 PM in London
- A 9 am – 5 pm working day in Chicago is3:00 PM – 11:00 PM in London
- Best time for a one-hour call (both in working hours)9:00 AM–11:00 AM in Chicago (3:00 PM–5:00 PM in London)
Reference date at build time. Tables below cover the whole year.
Convert a specific time
9:00 AM Chicago on Thu, Oct 22 is 3:00 PM London on Thu, Oct 22.
Tip: link straight to an answer with ?t=3pm or ?t=15:30&d=2026-10-22. Select any time in the hour-by-hour table below to fill this in.
Time difference through 2026
5 periods with a constant difference. The unusual periods last 21 days and 7 days: check meetings in those weeks.
| Dates in Chicago | London vs Chicago | 9:00 AM in Chicago is | Best one-hour call, Chicago time |
|---|---|---|---|
| Jan 1 – Mar 8 66 days | 6 hours ahead UTC−6 → UTC+0 | 3:00 PM | 9:00 AM–11:00 AM Within 9–5 for both |
| Mar 8 – Mar 28 21 days | 5 hours ahead UTC−5 → UTC+0 | 2:00 PM | 9:00 AM–12:00 PM Within 9–5 for both |
| Mar 28 – Oct 24 210 days | 6 hours ahead UTC−5 → UTC+1 | 3:00 PM | 9:00 AM–11:00 AM Within 9–5 for both |
| Oct 24 – Nov 1 7 days | 5 hours ahead UTC−5 → UTC+0 | 2:00 PM | 9:00 AM–12:00 PM Within 9–5 for both |
| Nov 1 – Dec 31 61 days | 6 hours ahead UTC−6 → UTC+0 | 3:00 PM | 9:00 AM–11:00 AM Within 9–5 for both |
Periods are split at every clock change in either place, calculated from the IANA time zone database at build time. The 9:00 AM and call examples use the middle date of each period. Future rules can change.
Hour-by-hour: Chicago to London
Every hour of the chosen day in Chicago, with working hours marked on both sides.
Showing 2026-10-22. Repeated hours after a clock change list both occurrences.
| Chicago | London | Date in London |
|---|---|---|
| 6:00 AM | Thu, Oct 22 | |
| 7:00 AM | Thu, Oct 22 | |
| 8:00 AM | Thu, Oct 22 | |
| 9:00 AM | Thu, Oct 22 | |
| 10:00 AM | Thu, Oct 22 | |
| 11:00 AM | Thu, Oct 22 | |
| 12:00 PM | Thu, Oct 22 | |
| 1:00 PM | Thu, Oct 22 | |
| 2:00 PM | Thu, Oct 22 | |
| 3:00 PM | Thu, Oct 22 | |
| 4:00 PM | Thu, Oct 22 | |
| 5:00 PM | Thu, Oct 22 | |
| 6:00 PM | Thu, Oct 22 | |
| 7:00 PM | Thu, Oct 22 | |
| 8:00 PM | Thu, Oct 22 | |
| 9:00 PM | Thu, Oct 22 | |
| 10:00 PM | Thu, Oct 22 | |
| 11:00 PM | Thu, Oct 22 | |
| 12:00 AM | Fri, Oct 23next day | |
| 1:00 AM | Fri, Oct 23next day | |
| 2:00 AM | Fri, Oct 23next day | |
| 3:00 AM | Fri, Oct 23next day | |
| 4:00 AM | Fri, Oct 23next day | |
| 5:00 AM | Fri, Oct 23next day |
9 am – 5 pm7–9 am, 5–9 pmNightShaded rows: working hours in both places
Public holidays in the next 60 days
National holidays in the United States and the United Kingdom. A call that works on the clock may still land on a day off. The planner above skips these dates when “Skip public holidays” is on.
- Wed, Nov 11 · Veterans Day (the United States)
- Thu, Nov 26 · Thanksgiving Day (the United States)
Questions about Chicago and London time
What is the time difference between Chicago and London?
It depends on the date. For most of 2026, London is 6 hours ahead of Chicago. From Mar 8 – Mar 28, it is 5 hours ahead of Chicago. From Oct 24 – Nov 1, it is 5 hours ahead of Chicago.
The difference changes because Chicago and London change their clocks on different dates.
What time is it in London when it is noon in Chicago?
When London is 6 hours ahead of Chicago: 12:00 PM in Chicago is 6:00 PM in London.
When London is 5 hours ahead of Chicago: 12:00 PM in Chicago is 5:00 PM in London.
When is the best time to call London from Chicago?
On a typical weekday, start a one-hour call between 9:00 AM–11:00 AM in Chicago (3:00 PM–5:00 PM in London). Both sides are inside 9 am – 5 pm.
Switch the converter above to Meeting planner to set your own working hours and meeting length, or exclude weekends.
Do Chicago and London use daylight saving time?
Chicago changes its clocks 2 times in 2026: forward on Sunday, March 8, 2026 (UTC−6 → UTC−5); back on Sunday, November 1, 2026 (UTC−5 → UTC−6).
London changes its clocks 2 times in 2026: forward on Sunday, March 29, 2026 (UTC+0 → UTC+1); back on Sunday, October 25, 2026 (UTC+1 → UTC+0).
Which time zone identifiers should I use in a calendar?
Chicago: America/Chicago. London: Europe/London. City identifiers carry the daylight saving rules, so a recurring event keeps its local time.