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Jet lag plan

Manaus → San Juan

Manaus and San Juan share the same time zone.

About 2,491 km due north · approximately 3.9-hour non-stop flight · a long-haul flight.

On arrival

  • Manaus and San Juan are in the same time zone — no jet lag adjustment needed.

About the Manaus → San Juan route

The route from Manaus, Brazil to San Juan, Puerto Rico covers roughly 2,491 kilometres in a due north direction. At standard jet cruise speed plus a one-hour allowance for taxi, climb, and descent, a non-stop flight takes about 3.9 hours. This route crosses the equator. The destination's season is reversed relative to the origin, which can amplify the perceived disorientation of jet lag — your body lands not just in a different clock but in a different daylight regime.

Manaus sits within ten degrees of the equator, so day length is nearly constant year-round (about 12 hours). Sunset and sunrise stay close to 06:00 and 18:00 regardless of season. San Juan is in the tropics, so day length varies only slightly across the year. Light cues for the circadian system stay strong year-round.

Business-hours overlap

Standard 09:00–18:00 working hours at both ends of this route overlap by approximately 9 hours. In Manaus that window runs 09:00 to 18:00; in San Juan it is 09:00 to 18:00. This is the realistic window for live meetings, customer calls, or pair work without forcing either end out of normal hours.

Daylight saving on this route

Neither city observes daylight saving time, so the hour offset on this route is fixed year-round. This makes recurring schedules and calendar invites with collaborators on the other end safer than for DST-observing pairs.

Frequently asked questions

How long is the flight from Manaus to San Juan?

The great-circle distance from Manaus to San Juan is about 2,491 kilometres. A typical non-stop flight takes around 3.9 hours at standard cruise speed; routes with connections add two to four hours.

What is the time difference between Manaus and San Juan?

Manaus and San Juan share the same time zone, so there is no clock offset on this route.

Is jet lag worse flying east or west on this route?

No circadian shift is required between these two cities.

Should I take melatonin for the Manaus → San Juan trip?

For a shift of 0 hours, melatonin offers little benefit beyond what consistent light exposure already provides. The Cochrane review on jet-lag melatonin shows the strongest effects on shifts of five hours or more.

Do I need a pre-trip schedule shift for Manaus → San Juan?

For a shift under two hours, pre-trip adjustment is usually not worth the effort.

What chronotype handles this route best?

Chronotype does not affect adjustment on a same-time-zone route.

Sources

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