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Jet lag plan

Karachi → Kolkata

Karachi and Kolkata share the same time zone.

About 2,187 km due east · approximately 3.5-hour non-stop flight · a long-haul flight.

On arrival

  • Karachi and Kolkata are in the same time zone — no jet lag adjustment needed.

About the Karachi → Kolkata route

The route from Karachi, Pakistan to Kolkata, India covers roughly 2,187 kilometres in a due east direction. At standard jet cruise speed plus a one-hour allowance for taxi, climb, and descent, a non-stop flight takes about 3.5 hours. Both cities sit in the northern hemisphere, so the seasonal direction of daylight (longer days in June, shorter in December) matches between origin and destination.

Karachi is in the subtropics. Day length varies by roughly two hours between summer and winter; light remains a reliable circadian cue most of the year. Kolkata 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 8.5 hours. In Karachi that window runs 09:00 to 17:30; in Kolkata it is 09:30 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 Karachi to Kolkata?

The great-circle distance from Karachi to Kolkata is about 2,187 kilometres. A typical non-stop flight takes around 3.5 hours at standard cruise speed; routes with connections add two to four hours.

What is the time difference between Karachi and Kolkata?

Karachi and Kolkata 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 Karachi → Kolkata trip?

For a shift of 0.5 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 Karachi → Kolkata?

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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