Paris to New York Jet Lag

Crossing six time zones west, Paris to New York is one of the more manageable long-haul routes to adjust for. You leave Paris in the afternoon and land in New York around 18:45 with the evening still ahead - the right position for a westbound traveler. This trip is relatively easy to adjust for as it follows the direction the human clock naturally tends to drift.

What is happening to your clock

Your body temperature has a lowest point each night: the temperature minimum, where alertness is at its worst. For a Paris sleeper with a 22:30 bedtime, that falls around 3:30 in the morning. Getting to New York time means sliding it six hours later, to 3:30 Eastern. It moves slowly - about an hour and a half per day - and light is what drives it: evening light delays the clock, morning light advances it. Going west, the strategy is to get light in the evening and avoid it in the morning.

The chart below maps the full plan in one view: when to shift before departure, how to handle light on travel day, and where the temperature minimum lands each day as it moves from Paris time toward New York.

Read the top scale as Paris time and the bottom as New York time. The dark sleep bands start in the Paris night and edge later each day, until they settle into the New York night. The amber marker - your temperature minimum - drifts along with them.

Start shifting your clock in Paris

The two days before departure can be leveraged to nudge your clock toward New York before you leave, so you land part of the way there rather than facing the full six-hour gap at once.

Each afternoon and evening, seek bright light - outdoors if you can, a well-lit room otherwise. Each morning, avoid light in the first few hours: sunglasses outside if needed, so early light can’t pull the clock back. Your bedtime slides about an hour later each night, from 22:30 toward half past midnight.

Over two days, the temperature minimum drifts roughly an hour per day. You can follow it on the chart: the amber marker shifts across the pre-flight rows, and the gap to New York narrows before the flight even appears.

Landing in the evening

On flight day, what matters is to keep the clock moving the same direction. Flight AF8 leaves CDG around 16:30 and touches down at JFK near 18:45, with the evening still ahead.

A short rest on the plane is fine if you need it, though landing with some tiredness left makes the early night easier. On the ground, stay in the light through the afternoon and evening. You can go to bed around half past nine, a little earlier than usual.

The first few days

Each following day repeats the same pair: evening light to keep shifting the clock, a dim morning to stop early light from pulling it back. The temperature minimum drifts the last hour or two and settles.

Your bedtime eases back toward a normal 22:30. Keep coffee to the morning and early afternoon - caffeine taken later finds its way into your sleep. Most people are on New York time after about three nights on the ground, seven in total counting the run-up in Paris, so stick with the plan through that third night even if you feel mostly fine sooner.

Why west is the easy direction

The human clock runs slightly long - around 24.2 hours on average - and drifts later on its own. A westbound trip asks for exactly that, so evening light is nudging a tendency that was already there. Eastbound trips demand the opposite, and the body resists.

Make it your own

This guide assumes one specific flight and a 22:30-to-06:30 sleeper. A different departure time or sleep pattern shifts every light and sleep window with it, because light only moves the clock when it falls at the right moment relative to your temperature minimum. The Jetlag Coach app calculates the exact windows for your actual flight and sleep schedule.