City comparison · time difference and converter
Reykjavik is 1 hour behind London right now. London sits in United Kingdom on London; Reykjavik sits in Iceland on Reykjavik. They are roughly 1,890 km apart (1,174 mi), a flight of about 3h 13m. London's metro holds around 9.5 million people; Reykjavik's around 0.2 million.
Slot 1
10:00 / 09:00
London / Reykjavik
Both inside business hoursSlot 2
11:00 / 10:00
London / Reykjavik
Both inside business hoursSlot 3
12:00 / 11:00
London / Reykjavik
Both inside business hoursEach row is one hour in London. 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.
Icelandic National Day
Reykjavik, Iceland · Þjóðhátíðardagurinn
Wed, Jun 17
Great-circle distance
1,890 km
(1,174 mi)
Approximate flight
3h 13m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
1h
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 London and Reykjavik is not really a number, it's a daily rhythm. Reykjavik is 1 hour behind London on the clock today, but the lived version is that London is ahead in the calendar, so by the time Reykjavik comes online, half of London's day is already gone. That gap, more than the raw offset, is what teams have to design around.
In London, the working day picks up earliest in the financial districts — City of London desks switch on by 07:30 for the European open. The mood in Reykjavik is its own story: Reykjavik settles into the evening at the usual hour, with the local commuter pattern setting the pace. 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 Kingdom shifts the clock on the last Sunday of March and October; Iceland follows the EU calendar (last Sunday of March and October). When the two changes are weeks apart, the offset between London and Reykjavik 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 3h 13m 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 1-hour gap costs about 1 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.