San Juan is typically 4 hours ahead of Los Angeles. When it's 9:00 AM in Los Angeles, it's 1:00 PM in San Juan. During daylight saving time (March to November), the difference reduces to 3 hours since Puerto Rico does not observe DST.
San Juan uses Atlantic Standard Time (AST/UTC-4) year-round, while Los Angeles operates on Pacific Time (PT). This significant time difference requires careful planning for business calls and meetings.
Optimal meeting window: 8:00 AM - 1:00 PM Los Angeles time (11:00 AM - 4:00 PM or 12:00 PM - 5:00 PM San Juan, depending on DST). This catches business hours in both locations.
Afternoon meetings in San Juan would require early morning participation from Los Angeles. For important calls, morning Pacific time generally works best for both parties.