Three numbers. The ones that decide the meeting.
When the world meets at work.
Read the day in both zones.
If it's this in London, it's that in San Juan.
When it's 8:00 am in London, it's 3:00 am in San Juan — late night there, the same day.
When it's 10:00 am in London, it's 5:00 am in San Juan — morning there, the same day.
When it's 12:00 pm in London, it's 7:00 am in San Juan — morning there, the same day.
When it's 3:00 pm in London, it's 10:00 am in San Juan — late morning there, the same day.
When it's 5:00 pm in London, it's 12:00 pm in San Juan — midday there, the same day.
When it's 9:00 pm in London, it's 4:00 pm in San Juan — afternoon there, the same day.
Crossing the border. Money, language, plugs.
Money changes hands at the border: London uses the GBP (£) and San Juan uses the USD ($). Conversations can stay in English, which is official in both countries. Be careful behind the wheel: London drives on the left, San Juan on the right.
- Country
- United Kingdom
- Capital
- London
- Currency
- British pound (GBP · £)
- Language
- English
- Calling code
- +44
- Drives on
- Left
- Country
- Puerto Rico
- Capital
- San Juan
- Currency
- United States dollar (USD · $)
- Language
- English, Spanish
- Calling code
- +1
- Drives on
- Right
Quick answers. Before you book the call.
What's the time difference between London and San Juan?
London is 5 hours behind San Juan. London runs on GMT+1 and San Juan on GMT-4. The gap can shift by an hour when either side enters or leaves daylight saving — the live clocks above always reflect the current offset.
When it's 10 am in London, what time is it in San Juan?
10:00 am in London is 5:00 am in San Juan on the same day — morning there. The same shift applies to any hour; the quick-conversion cards and the 24-hour table above cover the full day.
When it's 3 pm in London, what time is it in San Juan?
3:00 pm in London is 10:00 am in San Juan on the same day — late morning there. The same shift applies to any hour; the quick-conversion cards and the 24-hour table above cover the full day.
When's the best time to schedule a meeting?
There are 3 hours where both cities are inside a 09:00–17:00 workday. Aim for the middle of that window so neither side is starting or closing out.
Does daylight saving time change the difference?
Yes, if either city observes DST. When one side shifts and the other doesn't, the gap changes by one hour. The DST badges under each clock show whether each zone is currently shifted and when the next transition lands.
How far is London from San Juan?
About 6,758 km as the crow flies (great-circle distance). A non-stop commercial flight cruises that in roughly 8h 27m, not counting airport time, winds, or routing around restricted airspace.
Can I send this meeting time as a calendar invite?
Yes. Pick a time on the slider above, open the meeting card, customize the title and duration, then download the .ics file. It imports cleanly into Google Calendar, Outlook, and Apple Calendar with the correct timezone attached.
What currency do London and San Juan use?
London uses the British pound (GBP, £); San Juan uses the United States dollar (USD, $). Check the live rate before transferring money or paying with a card abroad — most banks add a 1–3 % FX margin on top of the mid-market rate.
How do I call London from San Juan?
Dial the international prefix used by your carrier (often 011), then +44, then the local number — drop any leading zero of the city or mobile code. For free calls, WhatsApp, Signal, and FaceTime work over Wi-Fi regardless of country code.
What language is spoken in London and San Juan?
Both United Kingdom and Puerto Rico count English among their official languages, so business meetings often skip translation. London also has no other official tongue; San Juan adds Spanish.
Do London and San Juan drive on the same side of the road?
No. United Kingdom drives on the left, Puerto Rico on the right. If you're renting, expect a learning curve on the first day — especially at roundabouts and when judging the centre of the lane.