San Juan to Phoenix Time
AST to MST Converter — 9 AM AST is 6:00 AM MST
San Juan is 3 hours ahead of Phoenix. Convert any time between San Juan (AST) and Phoenix (MST) instantly.
San Juan
Puerto Rico
Phoenix
United States
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Time Zone Comparison
San Juan to Phoenix Time Conversion Table
| San Juan (AST) | Phoenix (MST) |
|---|---|
| 12:00 AM | 9:00 PM |
| 2:00 AM | 11:00 PM |
| 4:00 AM | 1:00 AM |
| 6:00 AM | 3:00 AM |
| 8:00 AM | 5:00 AM |
| 10:00 AM | 7:00 AM |
| 12:00 PM | 9:00 AM |
| 2:00 PM | 11:00 AM |
| 4:00 PM | 1:00 PM |
| 6:00 PM | 3:00 PM |
| 8:00 PM | 5:00 PM |
| 10:00 PM | 7:00 PM |
San Juan & Phoenix — Business & Scheduling Guide
San Juan (Puerto Rico) is a US territory with pharmaceutical and tech manufacturing, with key industries in pharmaceuticals, medical devices, electronics, and tourism. Phoenix (United States) is a global financial and tech hub, known for technology, finance, healthcare, and entertainment. With a 3-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between San Juan and Phoenix
With only a 3-hour gap, San Juan and Phoenix have generous overlapping work hours. Morning calls in the earlier time zone align well with mid-day in the other. Puerto Rican business hours are typically 8 AM–5 PM, with a bilingual (English/Spanish) workforce. US business hours typically run 9 AM–5 PM, with a culture that values punctuality and efficiency. Most teams find that late morning to early afternoon offers the widest window for collaboration.
Daylight Saving Time Considerations
Neither San Juan nor Phoenix observes Daylight Saving Time — San Juan stays on AST and Phoenix stays on MST year-round. This makes scheduling between these two cities simpler, as the 3-hour time difference remains constant throughout the year with no DST surprises.
Collaboration Tools & Workflow
Teams working between San Juan and Phoenix enjoy strong real-time collaboration potential. With just a 3-hour time difference, daily standups, pair programming, and spontaneous video calls are all practical. Popular tools for San Juan–Phoenix teams include Slack for real-time messaging, Google Meet or Zoom for video calls, and Notion or Linear for project management. The overlapping work window is wide enough that most teams can operate nearly synchronously.
Remote Work Between San Juan & Phoenix
San Juan, a key city in Puerto Rico, and Phoenix, a key city in United States, are well-connected for remote work. With a manageable 3-hour time difference, distributed teams can maintain a near-synchronous workflow. Both cities have strong internet infrastructure, coworking spaces, and established remote work cultures. For freelancers and remote workers, this time zone pairing is ideal — you can serve clients in Phoenix from San Juan (or vice versa) without disrupting your standard workday.
AST to MST — Quick Reference
AST (AST) stands for the timezone used in San Juan, Puerto Rico (UTC-4). MST (MST) is the timezone used in Phoenix, United States (UTC-7). San Juan is 3 hours ahead of Phoenix.
To convert AST to MST, subtract 3 hours from AST time. For example, AST 9:00 AM = MST 6:00 AM.
Key Facts
- •Time difference: San Juan (UTC-4) is 3 hours ahead of Phoenix (UTC-7).
- •Daylight Saving Time: San Juan does not observe DST (AST). Phoenix does not observe DST (MST).
- •Regions: San Juan is located in Puerto Rico and uses the AST time zone. Phoenix is located in United States and uses the MST time zone.
- •Best time to call: The best time to call between San Juan and Phoenix is 12:00 PM to 4:00 PM in San Juan time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between San Juan and Phoenix?
San Juan is 3 hours ahead of Phoenix.
What time is it in Phoenix when it's 9 AM in San Juan?
When it's 9:00 AM in San Juan, it is 6:00 AM in Phoenix.
What time is 9 PM AST in MST?
9 PM AST (San Juan time) is 6:00 PM MST (Phoenix time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between San Juan and Phoenix?
The best time to schedule a meeting is between 12:00 PM to 4:00 PM in San Juan time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert AST to MST?
AST (AST) is the timezone for San Juan, Puerto Rico (UTC-4). MST (MST) is the timezone for Phoenix, United States (UTC-7). San Juan is 3 hours ahead of Phoenix. Quick examples: 9 AM AST = 6:00 AM MST, 12 PM AST = 9:00 AM MST, 3 PM AST = 12:00 PM MST, 6 PM AST = 3:00 PM MST.
Is San Juan ahead of or behind Phoenix?
San Juan is 3 hours ahead of Phoenix. When it's noon in San Juan, it's 9:00 AM in Phoenix.
Does San Juan or Phoenix change clocks for Daylight Saving Time?
No, San Juan does not observe DST — it stays on AST year-round. Phoenix does not observe DST — it stays on MST year-round.
What time is noon in San Juan in Phoenix time?
When it is 12:00 PM (noon) in San Juan (AST), it is 9:00 AM in Phoenix (MST). This is often a popular time for scheduling lunch-hour calls across the San Juan–Phoenix corridor.
What are the overlapping work hours between San Juan and Phoenix?
The overlapping work hours between San Juan and Phoenix are approximately 12:00 PM to 4:00 PM in San Juan time, when both cities are within the standard 9 AM–5 PM workday. This is the ideal window for meetings, pair programming, and real-time collaboration.
What timezone is San Juan in?
San Juan is in the AST time zone (UTC-4). It is located in Puerto Rico. San Juan does not observe Daylight Saving Time.
What timezone is Phoenix in?
Phoenix is in the MST time zone (UTC-7). It is located in United States. Phoenix does not observe Daylight Saving Time.
How do I schedule a call between San Juan and Phoenix?
To schedule a call between San Juan and Phoenix, aim for the overlapping window of 12:00 PM to 4:00 PM in San Juan time. Use Google Calendar or Calendly with both time zones visible, share the meeting invite with the MST time clearly noted, and always double-check the time difference — especially during DST transitions. Pro tip: include both local times in the calendar invite title (e.g., "Sync — 10 AM AST / 7:00 AM MST").
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