Jet lag from Bangkok to Zurich: what to expect
Fly Bangkok to Zurich and local time runs 6 hours behind your body. Land at 16:35 and your body still thinks it's 22:35 in Bangkok. That's the middle of your body's night. At 23:00 in Zurich, it's 05:00 for you.
That's a westward shift: your clock has to move later, which is the way it drifts on its own S1. Expect to be sleepy early in the evening for the first few days, and awake before your alarm S1.
How long does jet lag last from Bangkok to Zurich?
Unaided, westward shifts settle somewhat faster than a day per time zone: about 4 days for this one. S6 S7
This plan targets 3 days.
That's what the plan aims at, not a promise — bodies vary.
For this trip that's 1 day sooner than the unaided estimate, on the effort level that fits around a working day.
On night one the plan's bedtime is 21:00, early by Zurich's clock, and it moves later night by night, reaching 23:00 by night 4.
Sleep length tends to recover within about two days. The timing of your sleep takes longer to come right S2.
What does the plan say for a typical Bangkok to Zurich flight?
- Departs
- 11:00 Bangkok time
- Lands
- 16:35 Zurich time
- In the air
- about 11h 35m (estimate)
- Light, landing day
- 20:00–21:00 Seek bright light (delay shift)
- Last caffeine, landing day
- 13:00 on the plane
- Last caffeine, first full day
- 13:00
- First night's sleep
- 21:00–05:30
Westbound flights often go by day, so this example leaves Bangkok at 11:00 and lands in Zurich at 16:35 in the afternoon, after about 11h 35m in the air.
The flight time is our estimate for a nonstop from the distance, and the trip is set in January. It's the default traveler from the calculator: usually asleep 23:00 to 07:00, no melatonin, Real Life effort.
In July the gap is 5 hours, not 6, because Zurich moves its clocks and Bangkok doesn't.
On board, the plan keeps you awake apart from a short nap at 07:00 Zurich time, saving the real sleep for the night in Zurich.
The day before you fly, the plan keeps your morning dim, 07:00–09:00 Bangkok time, and the sun is up in Bangkok by about 06:44 in January, so plan on sunglasses for the commute.
On landing day your last coffee comes on the plane, at 13:00 Zurich time, and the plan has none between landing and your first night's sleep. From 05:30, when you wake from that first sleep, it allows it again, until 13:00.
January days are short in Zurich: about 9 hours of daylight. In January the sun sets in Zurich at about 17:06, so the 20:00 light step on landing day comes after dark. It has to be bright indoor light.
What helps after flying west to Zurich?
Going west, you want light before your body's low point, which usually means bright light in the evening and staying up a little later S1. Bright light first thing in the morning works against you. East vs west explains why this direction is the easier one.
If you nap on arrival, keep it short, so it doesn't eat into the night S1. The plan has no nap on landing day; its first is 30 minutes at 11:30, the next day. More tested advice in jet lag hacks, tested.
And the flight home from Zurich?
Zurich to Bangkok is the same 6 hours the other way, eastward. It's the harder direction: about 6 days unaided, and the plan targets 4. Jet lag from Zurich to Bangkok has the details.
More routes from Bangkok
Sources
Numbered from the site-wide source registry — every Delagged page uses the same numbering.
- S1 Roach GD, Sargent C. Interventions to Minimize Jet Lag After Westward and Eastward Flight. Frontiers in Physiology, 2019;10:927. doi:10.3389/fphys.2019.00927
- S2 Willoughby AR, Vallat R, Ong JL, Chee MWL. Insights about travel-related sleep disruption from 1.5 million nights of data. SLEEP, 2025;48(7):zsaf077. doi:10.1093/sleep/zsaf077
- S6 Waterhouse J, Reilly T, Atkinson G, Edwards B. Jet lag: trends and coping strategies. The Lancet, 2007;369:1117–29. doi:10.1016/S0140-6736(07)60529-7
- S7 Eastman CI, Burgess HJ. How to travel the world without jet lag. Sleep Medicine Clinics, 2009;4:241–55. doi:10.1016/j.jsmc.2009.02.006