Why is jet lag worse from the US to Europe than Europe to the US?
The human circadian clock does not run on a neat 24-hour cycle. It drifts. Most people’s internal rhythm wants to stretch the day longer, not compress it. Flying west from Europe to the US asks your body to stay up later. That is the direction it already wants to go. Flying east forces you to go to bed early. That fights the natural drift.
Land in New York or Los Angeles and you feel tired earlier than local time. But your body can stretch into the evening without much protest. The worst jet lag hits on the return leg, when you land in Europe and need to wake at 07:00 local. Your body thinks it is 01:00.
Save important meetings for the Europe→US trip. The return leg will cost you more sleep.
Typical time differences and their impact
The distance between Europe and the US spans 6 to 9 time zones.
From Central Europe the differences are constant throughout the year. New York is always 6 hours behind. Los Angeles is always 9 hours behind. Chicago is always 7 hours behind. Those numbers do not change when the clocks shift, because both sides move together. Mostly.
A 6-hour difference means a 14:00 flight from Frankfurt lands at 20:00 local in New York. That feels like 02:00 body time. You will be tired. You can still eat dinner, walk to the hotel, and fall asleep by 22:00 local. That is 04:00 body time. Your first night will be short. Your second day will be fine.
A 9-hour difference to Los Angeles is harder. A 10:00 departure from Paris lands at 13:00 local. That feels like 22:00 body time. You arrive in the middle of your biological night. Plan to nap. Skip caffeine after 16:00 local. Treat the first afternoon as a rest day.
Does a red-eye from Europe to the US make jet lag worse?
The most common Europe→US flight pattern is the red-eye. Depart in the evening from Europe, fly overnight, arrive in the morning US time.
A 20:00 departure from London Heathrow arrives at 07:00 New York local. You have not slept properly on the plane. You clear customs at 08:00. New York is waking up.
This arrival time is a trap. Your body thinks it is 14:00 Central European Time. You feel like you have been awake all night. Because you have. Social pressure says start your day. Hotels will not let you check in until 15:00. Meetings may be scheduled.
Book your hotel room for the night before arrival. Walk in, close the curtains, and sleep until 13:00 local. That nap resets your clock to the new time zone. It works better than pushing through on coffee.
If you cannot check in early, find a quiet cafe or a museum lobby. Sit still for two hours. Do not start sightseeing. Do not start working. The first four hours after landing set your body’s new anchor point. Waste them on sleep. Not on a bagel.
How DST misalignment affects jet lag Europe to US
Both Europe and the US observe daylight saving time. They do not change on the same dates.
In March, the US springs forward on the second Sunday. Europe springs forward on the last Sunday. That creates a 2-to-3-week window where the time difference shrinks by one hour.
In October and November, Europe falls back on the last Sunday of October. The US falls back on the first Sunday of November. That creates a 1-week window where the gap shrinks by another hour.
During those windows, New York is only 5 hours behind Central Europe. Los Angeles is 8 hours behind. That one hour matters. A 5-hour difference is noticeably easier to handle than 6.
Fly Europe→US in the last week of March or the first week of November if you can. You get a smaller clock shift and less jet lag.
Check the exact dates. Europe changes on 29 March 2026, springing forward, and 25 October 2026, falling back. The US changes on 8 March 2026 and 1 November 2026.
Practical recovery tips for each direction
Europe to US (westbound):
Stay awake until at least 22:00 local on arrival day. Do not go to bed at 19:00 even if you are exhausted. You will wake at 02:00 and ruin your next day.
Get morning sunlight. Step outside within 30 minutes of waking. Bright light tells your brain to shift earlier.
Eat meals at local meal times, not body times. A big dinner at 19:00 local helps anchor your new schedule.
Avoid alcohol on the flight. It fragments sleep and makes the first day worse.
US to Europe (eastbound, for reference):
Start shifting your bedtime earlier three days before departure. Go to bed 30 minutes earlier each night.
On arrival, avoid afternoon naps. Stay awake until 21:00 local even if you are dragging.
Use a sleep mask on the plane to block cabin lights during the night portion of the flight.
How can business travellers minimise jet lag flying Europe to US?
If you fly Europe→US weekly, the rules change. You cannot recover fully every time. Focus on protecting sleep, not eliminating jet lag.
Take the same flight number each week. Your body learns the pattern.
Land in the morning. Arriving at 07:00 gives you the whole day to push through. Arriving at 16:00 means you will be awake until 02:00 local.
Book a hotel with blackout curtains. Even streetlight through a gap can keep you from falling asleep.
Never schedule a meeting before 10:00 on arrival day. Your cognitive performance drops sharply in the first 6 hours after a red-eye.
The next clock change that affects your travel is 29 March 2026, when Europe springs forward. The gap with New York shrinks from 6 hours to 5 hours for two weeks. Plan your March trips in that window if you can.