Chennai is 4.5-5.5 hours ahead of London. London uses Greenwich Mean Time/British Summer Time (GMT/BST, UTC+0/+1) while Chennai uses Indian Standard Time (IST, UTC+5:30). During standard time, Chennai is 5.5 hours ahead; during daylight saving time, Chennai is 4.5 hours ahead.
India does not observe daylight saving time, while the UK does, so the difference varies seasonally.
Best calling time: 4:30 AM - 1:30 PM London time. This corresponds to approximately 9:00 AM - 6:00 PM in Chennai during daylight saving time.
London and Chennai have strong historical and business connections. Chennai is a major IT and automotive hub in India, with many British companies having operations there. Direct flights connect them.