London to Los Angeles: a jet lag plan that fits the route.
London (LHR) sits in Europe/London. Los Angeles (LAX) is west of you, 8 hours behind. The flight is around 10h 53m gate to gate.
London, United Kingdom to Los Angeles, United States crosses 8 time zones — and you’re going west, the gentler direction. Los Angeles is 8 hours behind home, on a flight of about 10 hours.
Westbound is gentler because your body’s default drift is later, not earlier. You’re going with the grain. The price is feeling sleepy in the late afternoon for a few days while the clock catches up.
For most travelers, that translates to about 6 days of feeling off. We grade this route as hard. The plan below is built around the things that actually move your body clock — light, sleep timing, caffeine, and (if you want it) a small dose of melatonin — applied at the times when they actually work.
How to fly London → Los Angeles without losing the first three days.
- 1Three days before — push bedtime later
Each night before the flight, go to bed and wake up 60 minutes later than usual. Catch evening light, skip morning light. You’re training your body to drift later — which is what it wants to do anyway.
- 2On the plane — stay awake unless it’s an overnight
Westbound, the goal is to roll into the destination already tired enough to sleep on local time. Save your sleep for the destination. Water every hour, alcohol skipped, walk every two hours.
- 3Day one — late-afternoon walk, no morning sun
Get outside in the last few hours of daylight; that’s the light that holds your clock later. Sunglasses early in the morning for the first two days — morning light here would push you back toward home time.
- 4Skip the melatonin, mostly
Westbound jet lag isn’t a melatonin problem — taking it just to sleep is fine, but it doesn’t shift you the way it does eastbound. If you wake up at 3 a.m. and can’t fall back asleep, a single 0.5 mg dose can help.
- 5Caffeine in the morning, cut by mid-afternoon
Coffee in the morning helps you push through to a normal local bedtime. Cut it eight hours before bed (twelve if you’re sensitive).
More about flying London to Los Angeles
Flight basics: London → Los Angeles
Nonstop flights from London (LHR) to Los Angeles (LAX) operate daily across major time zones. Major international carriers provide comfortable cabin configurations and flexible meal timing, allowing pre-landing adjustment to your destination schedule. Flight durations range widely by route distance, but most transatlantic flights cross 7–8 hours, while transpacific routes extend 11–14 hours depending on wind patterns and routing.
When to go (and when to brace)
Travel during your destination's shoulder season (spring or early fall) for easier adjustment without extreme weather stress.
At London
Begin light exposure adjustments 3–4 days before departure. If heading east, move your bedtime earlier by 1 hour daily; if heading west, delay it. At London's airport, position yourself in the brightest departure gate areas to anchor your current rhythm. Eat meals on your home timezone right up to boarding to minimize stomach confusion.
After landing in Los Angeles
Upon landing in Los Angeles, resist sleeping for at least 6–8 hours (unless arriving after midnight). Walk outdoors for 30–45 minutes in natural daylight to expose your eyes and skin to local circadian timing. Eat a meal shortly after arrival on local time, even if you're not hungry—your digestive rhythm anchors the clock faster than willpower alone.
What to actually expect
Flying London to Los Angeles always teaches me something unexpected. On my last trip, I landed at dawn and immediately felt the pull to rest, but instead I walked through the city streets for an hour. The sensory overload—unfamiliar architecture, different street sounds, the smell of local food carts—somehow rewired my brain faster than sleeping would have. By evening I was genuinely tired on local time, and I slept deeply that night. Now I always prioritize movement and novelty over comfort-seeking right after arrival.
Related routes
Frequently asked
How many hours is the time difference between London and Los Angeles?+
Los Angeles is 8 hours behind London. The exact gap can shift by an hour twice a year if either city observes daylight saving time.
How bad is the jet lag from London to Los Angeles?+
You’re flying west, crossing 8 time zones. Most people need about 6 days to feel normal. The first 48 hours are the worst — that’s when sleep is the most fragmented and the afternoon energy crash is the deepest.
Should I take melatonin?+
Westbound jet lag is mostly a fall-asleep-too-early, wake-up-at-3-a.m. problem. Melatonin taken at the destination bedtime can help with sleep onset, but it does not really shift your clock the way it does eastbound. A single 0.5 mg dose if you wake up in the middle of the night is the more useful play.
When is the best time to take a nap on arrival?+
Before 14:00 local time, no longer than 30 minutes. Naps later than that bleed into the evening and push your bedtime even further back, which is the opposite of what you want.
Does staying hydrated really help?+
Cabin air is 10–20% humidity (drier than the Sahara). Dehydration mimics the symptoms of jet lag — headache, fatigue, brain fog — so a hydrated traveler is just less miserable, even if their underlying clock hasn’t shifted yet. Alcohol multiplies the effect; skip it on the flight.