🇬🇧 London ↔ 🇺🇸 Philadelphia

London is usually 5 hours ahead of Philadelphia. Both observe daylight saving time, so the difference shifts by an hour for a few weeks around the spring and autumn changeovers.

Sunrise 4:45 AMSunset 9:23 PM(local)

Sunrise 5:34 AMSunset 8:34 PM(local)

London: daylight saving timeNow UTC+1. Next change: October 25, 2026 — clocks go back 1 hour.
Philadelphia: daylight saving timeNow UTC-4 EDT. Next change: November 1, 2026 — clocks go back 1 hour.
LondonUTC+1
PhiladelphiaUTC-4EDT

🇬🇧 London

Dialing code+44
Population8,961,989
Coordinates51.51°N, 0.13°W
Elevation25 m

🇺🇸 Philadelphia

Dialing code+1
Population1,573,916
Coordinates39.95°N, 75.16°W
Elevation12 m

Best time for a call: 14:00–18:00 in LondonAdd to calendar

25 October 2026 — 1 November 2026: the gap is 4h instead of the usual 5h — London and Philadelphia change clocks on different days.

Working hours assumed 9:00–18:00.

Frequently asked questions

What is the time difference between London and Philadelphia?
London is 5 hours ahead of Philadelphia. Use the side-by-side clocks and the day/night strips above to convert any hour between them.
When is the best time to call between London and Philadelphia?
The best window to call is 14:00–18:00 London time, when working hours overlap in both cities. Pick an hour on the strips to add it to your calendar.
Why does the time difference between London and Philadelphia change?
Because London and Philadelphia switch to or from daylight saving time on different dates, the gap between them is temporarily larger or smaller for a few weeks around those changes.