Should you sleep on a flight from London to New York?
London to New York crosses 4 time zones westbound. Westbound routes are often easier because your body clock can delay.
Local time in LHR
Auto-calculated in JFK
Stay awake on board
High confidenceBuild sleep pressure so your first local night is easier.
First day plan: Stay active after landing. Use caffeine in the early part of the day only. Avoid naps.
Why this recommendation?
- Arrival is in the evening (17:16), so preserving first-night sleep pressure is important.
- You are traveling west across 4 hours, which usually favors staying awake later.
- You only need to stay awake about 4.7 hours after landing to reach local bedtime.
Tips for your flight
- Hydrate consistently during and after the flight.
- Use caffeine early only; avoid it later in the destination day.
- Avoid intentional sleep on board; use movement, hydration, and light instead.
- Get bright light exposure after landing to reinforce destination daytime.
- After landing, stay awake until a normal local bedtime.
Route intelligence
Time difference: -4 hours. Direction: westbound.
Typical nonstop duration is around 7h 16m for this route distance.
Typical advice for this route: protect your first local night while managing fatigue. The best strategy depends mostly on departure/arrival timing, not just the route itself.
Understanding Your Flight
Time Zone Change
Flying west stretches your perceived day - clocks at JFK are 4 hours behind, so your day feels longer than 24 hours. Your body will want to sleep and wake earlier than locals in JFK.
Prefer the stretching vs squishing framing? Why this route stretches your day
Body Clock vs Local Time at Arrival
Your body clock
Based on LHR time on arrival
Local arrival time
John F. Kennedy International Airport
FAQ
Should I sleep on a London to New York flight? Usually yes for long-haul flights, but timing matters. Use the departure time input to get route-specific sleep windows.
Is jet lag worse flying there or back? Eastbound is usually harder than westbound for circadian adjustment, especially across large shifts.
How long does recovery usually take? For a 4-hour shift, many travellers need multiple days to fully adjust.
What should I do after landing? Follow the first-day plan in your recommendation card and use local light timing to reinforce the destination schedule.
These recommendations are educational, circadian-informed guidance and not medical advice. If you have a sleep disorder, are pregnant, take sleep-related medication, or have ongoing fatigue concerns, consult a clinician.
Read more: run your flight timing · jet lag guides · evidence and methodology