London is typically 5 hours ahead of New York. When it's 9:00 AM in New York, it's 2:00 PM in London. Both cities observe DST but on different schedules.
During DST transitions (2-3 weeks in March and November), the difference can be 4 or 6 hours. London uses GMT/BST, New York uses EST/EDT.
Afternoon London works best! 2:00 PM - 6:00 PM London corresponds to 9:00 AM - 1:00 PM New York. London afternoon catches NY morning.
London and New York are the world's two largest financial centers with overlapping trading hours. British Airways, Virgin Atlantic, American, Delta, and United operate 20+ daily flights.