Time Difference: Chicago vs London
Chicago
3:58:18 AM CDT
Sunday, October 25, 2026
5h
5h
London
8:58:18 AM GMT
Sunday, October 25, 2026
London is 5 hours ahead of Chicago.
Quick Reference
- Chicago
- CDT (GMT-5)
CST starts on Nov 1, 2026
- London
- GMT (GMT+0)
BST starts on Mar 28, 2027
Frequently Asked Questions
- What is the time difference between Chicago and London?
- London is 5 hours ahead of Chicago.
- When is the best time to call from Chicago to London?
- The best time to call is during overlapping business hours (9 AM – 5 PM) in both cities. Use the interactive converter on this page to visually compare hours side by side.
- Does the time difference change with daylight saving time?
- The time difference may change when either city enters or exits daylight saving time. Chicago uses CDT and London uses GMT.