Right time to call Puerto Rico (+1-787)
Puerto Rico runs on AST — four hours behind GMT, one hour ahead of US Eastern, with no daylight saving. Knowing the best time to call Puerto Rico on +1-787/939 keeps you inside San Juan office hours year-round.
AST, at a glance.
See the live gap between a global reference city and Puerto Rico's permanent AST zone — no calculator needed.
Puerto Rico against the world's hubs.
Compare live Puerto Rican time against New York, London and Miami so your call lands inside San Juan office hours.
Understanding the time difference between the United States and Puerto Rico
Time zone differences across other major countries
Why timing matters for calls to Puerto Rico.
AST puts San Juan one hour ahead of New York in winter — a morning call bridges the island and the US mainland without any timezone calculation.
The best windows to reach Puerto Rico.
Four factors that decide when a Puerto Rican prospect picks up — anchored to the permanent AST business day.
Puerto Rico runs at -04:00
The zone is America/Puerto_Rico. Every window on this page is worked out from that offset rather than a rule of thumb, so the times shown are the ones that actually apply to Puerto Rico.
No daylight saving
Puerto Rico stays on -04:00 all year. The windows below only move when the caller's own country changes its clocks, not when Puerto Rico does.
Shared hours with 3 of 5 markets
Callers in New York, Los Angeles, London share part of the working day with Puerto Rico. The table above gives the exact intersection for each.
Where the gap is too wide
There is no 9-to-5 overlap with Mumbai, Sydney. Calling Puerto Rico from those cities means someone is working outside normal hours — worth saying so when you book the call.
How to call Puerto Rico using the +1 code.
Four simple steps for every call into Puerto Rico — dial +1, then 787 or 939, then the seven-digit local number.
Number anatomy
Dial exit code
Press + on mobile or 00 from most landlines. This opens an international line.
Enter +1-787
Puerto Rico's international code. Every call to Puerto Rico must start with +1-787.
Area prefix
Add the local area or mobile network code — always drop any leading zero used for domestic calls.
Full number
Dial the remaining subscriber digits. Your number is now correctly formatted for international routing.
Best time to call — every country.
Jump to any country's best-time-to-call guide. Search by name, ISO or dial prefix.
Reach Puerto Rican customers in their window, on the right network.
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When your working day overlaps Puerto Rico
Callers in New York, Los Angeles and London share part of the working day with Puerto Rico. There is no shared working window with Mumbai and Sydney.
| Calling from | Puerto Rico is | Call at (your time) | Which is (their time) |
|---|---|---|---|
| New York | 1h ahead | 9:00 AM – 4:00 PM | 10:00 AM – 5:00 PM |
| Los Angeles | 4h ahead | 9:00 AM – 1:00 PM | 1:00 PM – 5:00 PM |
| London | 4h behind | 1:00 PM – 5:00 PM | 9:00 AM – 1:00 PM |
| Mumbai | 9h 30m behind | No shared working hours — you would need to call outside 9am-5pm | |
| Sydney | 15h behind | No shared working hours — you would need to call outside 9am-5pm | |
Windows are the intersection of a 9am-5pm working day in each place, using Puerto Rico'sstandard-time offset of -04:00. Puerto Rico does not observe daylight saving, so these windows hold all year — though they shift when the caller's own country changes its clocks.
FAQ
Calling Puerto Rico, answered.
Time zone, daylight saving and dialling questions for Puerto Rico (+1-787).