LA → TOKYO
How to Beat Jet Lag
Flying from LA to Tokyo
You fly westbound across the Pacific to Japan, and your calendar jumps forward by most of a day, one of the toughest trips to adapt to. Here's how Flightmode helps you sync before you land.
Try Flightmode, Save 50%WHY IT HITS HARD
LA to Tokyo is a circadian reset, not a tweak
You leave California in daylight on a westbound arc over the North Pacific and land in Japan when your body still thinks it's yesterday night. The lost calendar day, dry cabin air, and pressure changes stack fatigue on top of phase shift, making it far harder than a five-hour hop to Europe.
That's why most travelers spend their first night staring at the ceiling at 3 a.m. JST. The key to how to get over jet lag when traveling to Japan is shifting your clock before you board, not after you land.
How It Works
- Shift your clock forward before you fly. Starting two days before departure, you'll stay up a little later each night (midnight, then 1 a.m.) and avoid morning light so your body starts drifting toward Tokyo time before you even pack.
- Seek light in the LA evening. Each pre-flight night you'll get bright light from about 7–11 p.m., which tells your circadian clock that "daytime" is later than usual, effectively pulling it toward tomorrow's Tokyo morning.
- Sleep through the first half of the flight. You'll take Flightmode Sleep right around departure and sleep from takeoff through roughly the midpoint, covering what would be Tokyo's nighttime. Then you wake, grab some caffeine, and arrive in the afternoon feeling like you had a real night.
- Lock in Tokyo time on landing. Once you're on the ground, the plan has you seeking bright light until the evening, then cutting it off and taking Flightmode Sleep at 11 p.m. Tokyo time. By the second morning you're waking, eating, and caffeinating on a local schedule, not fighting a 16-hour gap.
- Use Flightmode to smooth each transition. Flightmode Sleep and Wake supplements support the sleep and caffeine cues at each stage, helping your body actually commit to the new schedule instead of snapping back.
Your LA → Tokyo jet lag plan
UA39 16-hour westbound shift
Times shown in departure airport time.
BEAT THE LA → TOKYO SHIFT
Your Jet Lag Plan, in a Gummy
Flightmode's Sleep & Wake system comes with an AI planner personalised to your exact route, wake time, and chronotype. Most users are fully adjusted within 24 hours of landing.
- Sleep gummy + Wake gummy in every kit
- AI planner timed to LA → 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 LA to Tokyo?
Tokyo is about 16–17 hours ahead of Los Angeles depending on daylight saving, so most travelers feel jet lag for 4–7 days without a plan. Symptoms include waking at odd hours, afternoon crashes, and brain fog. A gradual sleep and light schedule before departure can shorten that window a lot.
How do I sleep on a long flight to Japan?
Match rest to where you want to land, not where you left. On a daytime LAX–Haneda flight, short strategic naps usually work better than trying to sleep the whole way at the wrong circadian time. After landing, get bright light in the local afternoon and commit to a Japan bedtime — melatonin-free Flightmode Sleep can support wind-down without next-morning grogginess.
Why do my feet swell after flying?
Swollen feet after flying are caused by sitting for 10+ hours, which slows circulation. Stay hydrated, get up to walk the aisle periodically, and avoid salty snacks. Flightmode contains French Pine Bark extract, which is shown to help on long-haul crossings.
What's the best jet lag treatment for LA to Tokyo?
The most effective approach combines evening bright light at your origin before departure, caffeine in the local morning window, shifting your clock forward gradually (later bedtimes) in the days before you fly, and consistent meal timing. A structured plan beats winging it on a route this long.
Can I beat jet lag without melatonin?
Yes. A melatonin-free sleep supplement can support your body's natural wind-down without the side effects some people experience with melatonin. Pair it with light control and the pre-flight schedule you follow in the days before departure.
How soon before my flight should I start adjusting?
For a long westbound Pacific crossing to Japan, starting 2 days before departure lines up with the phased plan below, about an hour per day toward Japan time so you're already partially adapted at boarding.