London zone
GMT+1 (GMT+1)
Chicago zone
CDT (GMT-5)
Difference
6 hours behind London
Business overlap
2h (9-5 windows)
Working hours overlap
Each cell is one hour in London. Filled cells mark when 9 AM – 5 PM in London and Chicago both apply.
2 hours per day
- London
- GMT+1
- Chicago
- GMT-5
- Difference
- -6h
- Business overlap
- 2h
Hour-by-hour conversion
Each row shows the matching local time in Chicago for an hour in London.
| London | Chicago | Day | Window |
|---|---|---|---|
| 12:00 AM | 6:00 PM | previous day | — |
| 1:00 AM | 7:00 PM | previous day | — |
| 2:00 AM | 8:00 PM | previous day | — |
| 3:00 AM | 9:00 PM | previous day | — |
| 4:00 AM | 10:00 PM | previous day | — |
| 5:00 AM | 11:00 PM | previous day | — |
| 6:00 AM | 12:00 AM | same day | — |
| 7:00 AM | 1:00 AM | same day | — |
| 8:00 AM | 2:00 AM | same day | — |
| 9:00 AM | 3:00 AM | same day | — |
| 10:00 AM | 4:00 AM | same day | — |
| 11:00 AM | 5:00 AM | same day | — |
| 12:00 PM | 6:00 AM | same day | — |
| 1:00 PM | 7:00 AM | same day | — |
| 2:00 PM | 8:00 AM | same day | — |
| 3:00 PM | 9:00 AM | same day | Both 9-5 |
| 4:00 PM | 10:00 AM | same day | Both 9-5 |
| 5:00 PM | 11:00 AM | same day | — |
| 6:00 PM | 12:00 PM | same day | — |
| 7:00 PM | 1:00 PM | same day | — |
| 8:00 PM | 2:00 PM | same day | — |
| 9:00 PM | 3:00 PM | same day | — |
| 10:00 PM | 4:00 PM | same day | — |
| 11:00 PM | 5:00 PM | same day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 3:00 PM – 5:00 PM in London 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 London time to Chicago time
London follows the Europe/London time zone (currently GMT+1, GMT+1), while Chicago follows America/Chicago (currently CDT, GMT-5). Chicago is 6 hours behind London 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
London
- Spring forward · Sunday, March 29, 2026
- Fall back · Sunday, October 25, 2026
Chicago
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
Reverse this conversion
Chicago to London
Open the converter
Plan a meeting between London and Chicago
More conversions from London
Frequently asked questions
- How many hours is London from Chicago?
- Chicago is 6 hours behind London right now.
- What time is 9:00 AM London in Chicago?
- 9:00 AM in London is 3:00 AM in Chicago.
- What time is 5:00 PM London in Chicago?
- 5:00 PM in London is 11:00 AM in Chicago.
- When do London and Chicago business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 2 hours, roughly from 3:00 PM to 5:00 PM in London time.
- Does daylight saving time change the difference between London and Chicago?
- Both London and Chicago 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 London
Local time page
Time in Chicago