Chicago zone
CDT (GMT-5)
London zone
GMT+1 (GMT+1)
Difference
6 hours ahead of Chicago
Business overlap
2h (9-5 windows)
Working hours overlap
Each cell is one hour in Chicago. Filled cells mark when 9 AM – 5 PM in Chicago and London both apply.
2 hours per day
- Chicago
- GMT-5
- London
- GMT+1
- Difference
- +6h
- Business overlap
- 2h
Hour-by-hour conversion
Each row shows the matching local time in London for an hour in Chicago.
| Chicago | London | Day | Window |
|---|---|---|---|
| 12:00 AM | 6:00 AM | same day | — |
| 1:00 AM | 7:00 AM | same day | — |
| 2:00 AM | 8:00 AM | same day | — |
| 3:00 AM | 9:00 AM | same day | — |
| 4:00 AM | 10:00 AM | same day | — |
| 5:00 AM | 11:00 AM | same day | — |
| 6:00 AM | 12:00 PM | same day | — |
| 7:00 AM | 1:00 PM | same day | — |
| 8:00 AM | 2:00 PM | same day | — |
| 9:00 AM | 3:00 PM | same day | Both 9-5 |
| 10:00 AM | 4:00 PM | same day | Both 9-5 |
| 11:00 AM | 5:00 PM | same day | — |
| 12:00 PM | 6:00 PM | same day | — |
| 1:00 PM | 7:00 PM | same day | — |
| 2:00 PM | 8:00 PM | same day | — |
| 3:00 PM | 9:00 PM | same day | — |
| 4:00 PM | 10:00 PM | same day | — |
| 5:00 PM | 11:00 PM | same day | — |
| 6:00 PM | 12:00 AM | next day | — |
| 7:00 PM | 1:00 AM | next day | — |
| 8:00 PM | 2:00 AM | next day | — |
| 9:00 PM | 3:00 AM | next day | — |
| 10:00 PM | 4:00 AM | next day | — |
| 11:00 PM | 5:00 AM | next day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 9:00 AM – 11:00 AM in Chicago time. That gives you 2 hours per workday for live meetings.
Tighter overlap is achievable by having the side with later working hours start earlier, or by treating the first and last hours of each side as flexible. The bar above marks every hour where both cities sit inside a 9 AM – 5 PM window.
About converting Chicago time to London time
Chicago follows the America/Chicago time zone (currently CDT, GMT-5), while London follows Europe/London (currently GMT+1, GMT+1). London is 6 hours ahead of Chicago right now.
Both cities observe daylight saving time. If their transition weekends differ, the offset shifts by one hour for a few weeks each spring and autumn.
Daylight saving transitions in 2026
Chicago
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
London
- Spring forward · Sunday, March 29, 2026
- Fall back · Sunday, October 25, 2026
Reverse this conversion
London to Chicago
Open the converter
Plan a meeting between Chicago and London
More conversions from Chicago
Frequently asked questions
- How many hours is Chicago from London?
- London is 6 hours ahead of Chicago right now.
- What time is 9:00 AM Chicago in London?
- 9:00 AM in Chicago is 3:00 PM in London.
- What time is 5:00 PM Chicago in London?
- 5:00 PM in Chicago is 11:00 PM in London.
- When do Chicago and London business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 2 hours, roughly from 9:00 AM to 11:00 AM in Chicago time.
- Does daylight saving time change the difference between Chicago and London?
- Both Chicago and London observe daylight saving time. If their transition dates differ, the offset between them shifts by an hour for a few weeks each year.
Local time page
Time in Chicago
Local time page
Time in London