London → Tokyo
London to Tokyo Jet Lag: How Long It Lasts and How to Beat It
Tokyo is eight hours ahead of London and the adjustment takes about six and a half days untreated. Flights leave around midday and land in the morning after roughly fourteen hours, which means you arrive at 9am Tokyo with your body reading 1am. Your temperature low sits near 1pm Tokyo on day one, so morning light works against you. Wait for the afternoon.
Try Flightmode — Save 50%Why this route is harder than it was five years ago
The longer southern routing adds two to three hours of seat time compared to the old polar routes. That is two to three more hours of dry cabin air, restricted movement, and shallow sleep. Fatigue from the flight itself stacks on top of the eight-hour shift.
Daytime departures from Heathrow make in-flight sleep hard even when you are tired. Most passengers arrive having dozed in ninety-minute fragments rather than slept. Budget for that separately from your jet lag plan: hydration, compression, and a real meal before boarding matter more when the flight runs fourteen hours instead of eleven.
How It Works
- Shift earlier before leaving London. Two days out, you'll pull bedtime from midnight toward 11 p.m. and get bright light when you wake. Tokyo is eight hours ahead, and starting the shift at home means less recovery after landing.
- Get afternoon light in London. Seek bright light from 10 a.m. to 5 p.m. on pre-flight days. It pushes your clock eastward so Tokyo afternoons feel natural instead of like the middle of the night.
- Sleep the overnight to Tokyo. Your flight departs at 1:10 p.m. and lands at 10:55 a.m. the next day. You'll take Flightmode Sleep soon after takeoff and sleep through as much of the crossing as you can. Caffeine is fine early, then cut it off so rest comes easy.
- Settle into Tokyo from day one. Once you land, get outside from 3 p.m. to 9 p.m. and take Flightmode Sleep around 1 a.m. that first night. By day two you're on Tokyo time after an 8-hour jump.
- Flightmode Sleep and Wake support the crossing. Sleep reinforces each bedtime shift, and Wake keeps caffeine aligned with Tokyo instead of London.
Your London → Tokyo jet lag plan
BA5 · 8-hour eastbound shift
Times shown in departure airport time.
Beat the London → Tokyo shift
Your Jet Lag Plan, in a Gummy
The Travel Planner accounts for the longer current flight time and sets your windows against your real arrival rather than a pre-2022 schedule.
- Sleep gummy + Wake gummy in every kit
- AI planner timed to London → Tokyo
- Melatonin-free, no morning grogginess
- 30-day First Flight guarantee
What long-haul travelers say
"No jet lag flying solo. Flying over and flying back I had absolutely no jet lag. Everyone else on the plane was feeling the effects — I was perfectly fine."
"No more 3am wakeups. Usually I wake at odd hours for a week after a big time change. With Flightmode, I slept through the night faster."
"I was full of energy and started my trip immediately. Do not waste your first day in a new time zone dealing with jet lag."
Frequently asked questions
How long does jet lag last flying from London to Tokyo?
About six and a half days untreated, three with a pre-shift.
Why is the flight longer than it used to be?
Airspace restrictions push the route south over Central Asia, adding two to three hours.
Is Tokyo to London easier?
Yes. Westbound is an eight hour delay and delays run about a third faster. Expect four days coming home against six and a half going out.
Should I sleep on the daytime flight to Tokyo?
The back half only. Sleeping early on a midday departure is difficult and less useful than sleeping in the final hours.
Is London to Tokyo worse than LA to Tokyo?
Different, and in some ways worse. London is a true eight hour advance. Los Angeles is an eight hour delay, and delays are easier.