Peru Jet Lag Calculator

A gap this size is a weekend problem, not a week problem: Lima mornings feel early at first. By day three or four in Peru, your body has caught up. Two Peru specifics compound the shift: Lima sits at 154 m (altitude makes poor sleep feel worse), and South America sits on the South America travel circuit most Peru itineraries follow.

Jet lag into Lima scales with one number: |home offset − -5|. Reference frame for Peru: Lima keeps UTC-5 and sits 154 m above sea level in South America, with that same offset in every season.

Dry cabin air quietly drains you on the way to Peru; an extra 500 ml of water per 3 hours in the air keeps the Lima arrival day survivable. Each eastbound zone costs about one recovery day, each westbound zone about two-thirds of a day — so the London–Lima leg (westbound, 5 hours) bills you about 3.3 days, while flying the opposite direction would cost only 5.

On arrival, anchor the new rhythm with an outdoor morning in Lima and meals on Peru time from the first day. Applied to this South America trip: 5 hours west from London to Lima maps to about 3.3 reset days, so a Peru itinerary should front-load outdoor time on days one to 4.

The Peru sleep kit for Lima at 154 m: an eye mask, earplugs, curtains closed against late evening light, and a room held near 16–20°C. A 10-minute warm shower an hour before bed speeds the core-temperature drop that starts sleep — a real head-start on the first jangled Peru nights in Lima.

Naps are a tool with a limit in Peru: 20–30 minutes, done by 3pm Lima time, never as a substitute for a full local night. Practical baseline: lights out in a dark 16–20°C Lima room (154 m, UTC-5), and no evening alcohol for the first two nights while the Peru clock settles.