City comparison · time difference and converter
London is 5 hours ahead of Boston right now. Boston sits in United States on New York; London sits in United Kingdom on London. They are roughly 5,264 km apart (3,271 mi), a flight of about 7h 12m. Boston's metro holds around 4.9 million people; London's around 9.5 million.
Slot 1
09:00 / 14:00
Boston / London
Both inside business hoursSlot 2
10:00 / 15:00
Boston / London
Both inside business hoursSlot 3
11:00 / 16:00
Boston / London
Both inside business hoursEach row is one hour in Boston. Green rows are inside business hours in both cities; amber means only one side is at their desk; grey rows fall outside business hours in both.
Juneteenth
Boston, United States
Fri, Jun 19
Great-circle distance
5,264 km
(3,271 mi)
Approximate flight
7h 12m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
5h
Roughly 1 day to adjust per timezone crossed
The heatmap gives you the shape of the day. If you need to convert one specific hour — say a customer call or a release window — open the converter with both cities already loaded.
Open in converter →The difference between Boston and London is not really a number, it's a daily rhythm. London is 5 hours ahead of Boston on the clock today, but the lived version is that London is wrapping up the working day while Boston is still in the morning, and the overlap people actually use is narrow. That gap, more than the raw offset, is what teams have to design around.
In Boston, the working day picks up earliest in the financial districts — Boston's downtown core wakes early and breaks for lunch at the usual hour. The mood in London is its own story: the Square Mile crowds Cannon Street at 08:00 and the pubs near Liverpool Street fill at 17:30. If you are scheduling between the two, the heatmap above marks the rows where both patterns line up.
Daylight saving is the other thing to keep an eye on. United States shifts the clock on the second Sunday of March and the first Sunday of November; United Kingdom follows the EU calendar (last Sunday of March and October). When the two changes are weeks apart, the offset between Boston and London is one hour off the usual for that stretch — a cliff that catches recurring calendar invites unless your calendar app rebases them automatically. Pin the meeting to a city, not an offset, and the tool handles the rest.
For travellers, the 7h 12m flight is the short version of the story. The longer one is jet lag: roughly one day of adjustment per timezone crossed, which means a trip across the 5-hour gap costs about 5 groggy days on each side. Pilots and cabin crew swear by morning sunlight and an early walk; whatever your routine, the wall-clock numbers above are the source of truth for your first morning in the new city.