Jet lag from San Francisco to Zurich: what to expect
Fly San Francisco to Zurich and local time runs 9 hours ahead of your body. Land at 07:30 and your body still thinks it's 22:30 in San Francisco. That's the middle of your body's night. At 23:00 in Zurich, it's 14:00 for you.
That's an eastward shift: your clock has to move earlier, against its natural drift S1. It's why the first nights after flying east bring trouble falling asleep at local bedtime, and a groggy late morning S1.
How long does jet lag last from San Francisco to Zurich?
Unaided, eastward shifts settle at around a day per time zone: about 9 days for this one. S6 S7
This plan targets 8 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 has you sleep 09:00–14:25, a daytime sleep in Zurich; for your body it's midnight in San Francisco. From there the bedtime pulls earlier night by night, reaching 23:00 by night 10.
Studies of aircrew point the same way: after large shifts, westward adaptation runs roughly 50% faster than eastward S6 S8. This trip is on the slow side of that.
What does the plan say for a typical San Francisco to Zurich flight?
- Departs
- 10:35 San Francisco time
- Lands
- 07:30 Zurich time +1 day
- In the air
- about 11h 55m (estimate)
- Light, landing day
- 14:25–15:25 Get outside into bright light
- Keep it dim, landing day
- 22:25–00:25 Avoid bright light before bed
- Last caffeine, landing day
- 17:30
- First night's sleep
- 09:00–14:25 the morning you land
Eastbound long-hauls tend to land in the morning, so this example lands in Zurich at 07:30, leaving San Francisco at 10:35 the day before, after about 11h 55m 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.
On board, the plan keeps you awake apart from a short nap at 21:10 Zurich time, saving the real sleep for the night in Zurich.
The day before you fly, the plan starts with light at 07:00–08:00 San Francisco time. San Francisco's sunrise, about 07:21 in January, comes partway through, so finish it outside.
January days are short in Zurich: about 9 hours of daylight. In January the sun is up in Zurich from about 08:04 to 17:08, so the 14:25 light step on landing day is daylight. Outside is the easy way to get it.
What helps after flying east to Zurich?
Going east, you want light after your body's low point and darkness before it S1. In the first days after a big shift that often means sunglasses in the morning and the early afternoon outside. Why flying east is harder goes through the mechanism.
Melatonin has its best trial results on eastward flights across five or more time zones S5. It's a timing signal, not a sleeping pill: melatonin for jet lag covers when to take it. Check with your doctor first.
And the flight home from Zurich?
Zurich to San Francisco is the same 9 hours the other way, westward. It's the easier direction: about 6 days unaided, and the plan targets 5. Plan the flight home from Zurich with your own times.
More routes from San Francisco
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
- S5 Herxheimer A, Petrie KJ. Melatonin for the prevention and treatment of jet lag. Cochrane Database of Systematic Reviews, 2002. doi:10.1002/14651858.CD001520
- 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
- S8 Samel A, et al. Aircrew adaptation after transmeridian flights, 1995. As cited in Waterhouse et al., The Lancet 2007 (S6). Full text Cited via S6.