Zone & HourChicago to LondonTime Converter
Compare the same moment in United States and United Kingdom.
Chicago to London: the time difference
On 2026-10-05 at 9:00 AM in Chicago, it is 3:00 PM in London (Monday, October 5, 2026). London is 6 hours ahead of Chicago.
Chicago uses US Central Time. The abbreviation CST is also used elsewhere with different meanings; America/Chicago removes that ambiguity. London is often described as being on GMT, but it uses British Summer Time during part of the year. Choosing Europe/London keeps both seasons attached to the same calendar event.
24-hour conversion table
Source date: 2026-10-05 in Chicago. Each row is a real instant; the destination date is shown explicitly. Repeated hours appear twice and nonexistent hours are labeled.
| Chicago | London | Date in London |
|---|---|---|
| 12:00 AM UTC−05:00 | 6:00 AM UTC+01:00 | 2026-10-05 Today |
| 1:00 AM UTC−05:00 | 7:00 AM UTC+01:00 | 2026-10-05 Today |
| 2:00 AM UTC−05:00 | 8:00 AM UTC+01:00 | 2026-10-05 Today |
| 3:00 AM UTC−05:00 | 9:00 AM UTC+01:00 | 2026-10-05 Today |
| 4:00 AM UTC−05:00 | 10:00 AM UTC+01:00 | 2026-10-05 Today |
| 5:00 AM UTC−05:00 | 11:00 AM UTC+01:00 | 2026-10-05 Today |
| 6:00 AM UTC−05:00 | 12:00 PM UTC+01:00 | 2026-10-05 Today |
| 7:00 AM UTC−05:00 | 1:00 PM UTC+01:00 | 2026-10-05 Today |
| 8:00 AM UTC−05:00 | 2:00 PM UTC+01:00 | 2026-10-05 Today |
| 9:00 AM UTC−05:00 | 3:00 PM UTC+01:00 | 2026-10-05 Today |
| 10:00 AM UTC−05:00 | 4:00 PM UTC+01:00 | 2026-10-05 Today |
| 11:00 AM UTC−05:00 | 5:00 PM UTC+01:00 | 2026-10-05 Today |
| 12:00 PM UTC−05:00 | 6:00 PM UTC+01:00 | 2026-10-05 Today |
| 1:00 PM UTC−05:00 | 7:00 PM UTC+01:00 | 2026-10-05 Today |
| 2:00 PM UTC−05:00 | 8:00 PM UTC+01:00 | 2026-10-05 Today |
| 3:00 PM UTC−05:00 | 9:00 PM UTC+01:00 | 2026-10-05 Today |
| 4:00 PM UTC−05:00 | 10:00 PM UTC+01:00 | 2026-10-05 Today |
| 5:00 PM UTC−05:00 | 11:00 PM UTC+01:00 | 2026-10-05 Today |
| 6:00 PM UTC−05:00 | 12:00 AM UTC+01:00 | 2026-10-06 Tomorrow |
| 7:00 PM UTC−05:00 | 1:00 AM UTC+01:00 | 2026-10-06 Tomorrow |
| 8:00 PM UTC−05:00 | 2:00 AM UTC+01:00 | 2026-10-06 Tomorrow |
| 9:00 PM UTC−05:00 | 3:00 AM UTC+01:00 | 2026-10-06 Tomorrow |
| 10:00 PM UTC−05:00 | 4:00 AM UTC+01:00 | 2026-10-06 Tomorrow |
| 11:00 PM UTC−05:00 | 5:00 AM UTC+01:00 | 2026-10-06 Tomorrow |
Does the time difference change during 2026?
Yes. The daily reference calculation finds 5 and 6-hour differences across the year. A repeating meeting tied to one city's clock can move on the other city's calendar.
| Dates (2026) | London relative to Chicago |
|---|---|
| 2026-01-01 – 2026-03-07 | 6 hours ahead |
| 2026-03-08 – 2026-03-28 | 5 hours ahead |
| 2026-03-29 – 2026-10-24 | 6 hours ahead |
| 2026-10-25 – 2026-10-31 | 5 hours ahead |
| 2026-11-01 – 2026-12-31 | 6 hours ahead |
Ranges sample each date at 12:00 UTC. A transition can occur partway through the first or last date. Use the converter for the precise instant. Calculated from this build’s Intl time-zone rules; future legislation may change them.
Chicago: The 2026 reference data includes UTC−06:00 and UTC−05:00. Select the actual meeting date: one fixed offset will not describe the whole year.
London: The 2026 reference data includes UTC+00:00 and UTC+01:00. Select the actual meeting date: one fixed offset will not describe the whole year.
Best time to call London from Chicago
For a one-hour call on 2026-10-05, these example start times fit a 9 AM–6 PM workday in both cities. A shared workday is not a guarantee that a person is free.
| Start in Chicago | Start in London |
|---|---|
| 9:00 AM | 3:00 PM |
| 10:00 AM | 4:00 PM |
| 11:00 AM | 5:00 PM |
Chicago–London questions
Is London ahead of Chicago?
On 2026-10-05, London is 6 hours ahead of Chicago. The size of the difference changes during the year; consult the seasonal table.
What is 9 AM in Chicago in London?
On 2026-10-05, 9 AM in Chicago is 3:00 PM on 2026-10-05 in London. Both cities are on the same calendar date in this example.
Why does this time difference change?
The two cities do not maintain an identical offset relationship through the year. Chicago uses UTC−06:00 / UTC−05:00, while London uses UTC+00:00 / UTC+01:00. Anchor invitations to an IANA city zone so the calendar can follow each date’s rules.