New York to London Time Difference (and the One Week It Shrinks)

For most of the year, London is 5 hours ahead of New York: when it's 12:00 noon in New York, it's 5:00 PM in London. That holds whenever both cities are on the same side of their daylight saving schedules — either both observing it in summer or both on standard time in deep winter.

Both New York and London do observe daylight saving time, so the gap between them usually stays a steady 5 hours even as the absolute clocks shift, because they spring forward and fall back together — almost.

The catch is that the UK and the US don't change their clocks on the same day. The UK (and the rest of Europe) ends daylight saving on the last Sunday of October — October 25 in 2026 — while the US doesn't fall back until the first Sunday of November, which is November 1 in 2026.

For that one week in between, London has already fallen back but New York hasn't, so the difference shrinks from 5 hours to 4. When it's 12:00 noon in New York during that week, it's 4:00 PM in London, not 5:00 PM. On November 1, the US catches up, and the gap returns to 5 hours.

This narrow window is a classic scheduling trap for transatlantic calls and flights: a recurring meeting set for '2:00 PM New York, 7:00 PM London' will silently be an hour off for that week, landing at 6:00 PM London time instead.

The safest habit is to re-confirm the actual local times on both ends during late October rather than assuming the usual 5-hour rule holds. The live comparison above always shows the current, correct gap.