Everything you need to know about staying comfortable, healthy, and rested on flights over six hours.
Long-haul flights — those stretching beyond six hours — put real physical demands on your body. The dry cabin air sits at 10-20% humidity (lower than most deserts), cabin pressure hovers around the equivalent of 2,400 metres altitude, and the combination of immobility and disrupted circadian rhythms leaves many travellers landing in worse shape than when they boarded. These 15 tips address all of it, from what you pack to how you move, drink, eat, and sleep.
Quick answer: The most effective ways to get through a long-haul flight are to stay consistently hydrated (around 240 ml of water per hour in the air), move your legs every one to two hours to protect circulation, set your watch to the destination time zone at boarding, and pack earplugs or noise-cancelling headphones plus an eye mask to maximise sleep.
Hours that define a long-haul flight
Cabin air humidity - lower than most deserts
Water per hour recommended in-flight
Equivalent altitude of cabin pressure
Aisle seats let you stand and move freely, which is the single most effective thing you can do against DVT — deep vein thrombosis, a condition where blood clots form in the legs due to prolonged sitting and poor circulation. If you plan to sleep the whole flight, a window seat offers a wall to lean on and shade control. Avoid the middle seat in either case.
Most European airports still enforce the 100 ml per container rule, with all containers fitting in one one-litre resealable bag. Some airports with CT scanners now allow up to two litres, but the rollout is uneven — pack to 100 ml unless you have confirmed your terminal has fully switched over. Solid toiletries (shampoo bars, toothpaste tablets) bypass the rule entirely.
Load earplugs or headphones, an eye mask, moisturiser, lip balm, snacks and a light layer into the seatback pocket as soon as you sit down. A large scarf doubles as a blanket, neck pillow and eye cover — one item that earns its weight many times over.
In-flight Wi-Fi is unreliable on most long-haul routes, so download films, podcasts and music before you leave the gate. Carry a fully charged power bank for flights where USB ports are absent or slow.
Ten to fifteen minutes of walking or stretching before boarding warms up muscles and reduces the stiffness that builds in the first hours of the flight. Focus on calf raises, hip circles and gentle back stretches.
DVT risk rises significantly on flights over six hours, and window seat passengers face roughly double the risk of aisle passengers partly due to reduced movement. Stand up and walk the aisle every one to two hours, and do ankle rolls and calf raises while seated. If you are at higher risk (recent surgery, prior DVT, pregnancy, active cancer, or taking oestrogen), consult a doctor before travel.
Tight waistbands restrict circulation in the legs and worsen in-flight bloating — both become more uncomfortable over a 10-hour flight. Dress in breathable layers, since cabin temperature can shift significantly between boarding and cruising altitude.
Cabin humidity sits between 10% and 20% — far below normal indoor levels — causing your body to lose water faster than on the ground. The Aerospace Medical Association estimates losses of around 240 ml per hour, mostly through breathing. Carry a reusable bottle through security and ask cabin crew for regular refills.
Alcohol dehydrates and disrupts sleep, caffeine depletes fluids further, and carbonated drinks worsen bloating as cabin pressure causes gut gases to expand. Stick to still bottled water; if you want variety, herbal tea from sealed bags is a safe option.
Reduced cabin pressure causes gut gases to expand, so a heavy meal before boarding makes discomfort worse. Opt for lean proteins, fruit and wholegrains, and avoid beans, cabbage, onions and carbonated drinks in the 24 hours before a long flight. Packing your own snacks — nuts, crackers, fruit — gives you a better option between service rounds.
Engine noise at cruising altitude sits around 85 decibels, so quality foam earplugs or noise-cancelling headphones are non-negotiable. Add an eye mask to block irregular cabin lighting and a neck pillow to stop the head-drop that jolts you awake.
Deciding when to sleep and wake based on destination time — not home time — is the simplest jet lag intervention available. If it is night at your destination, sleep now; if it is daytime, stay awake and seek light on arrival. The CDC recommends morning light for eastbound travel and late afternoon or evening light for westbound.
Moving your bedtime 30-60 minutes per day toward the destination time zone in the two to three days before departure reduces the gap your body needs to close on arrival. For eastbound travel, go to bed and wake earlier; for westbound, later. Starting the journey well-rested makes the adjustment significantly easier.
Low doses of 0.5-1 mg taken at the new time zone's bedtime can help shift your circadian clock. The CDC advises against doses above 5 mg, as excess melatonin at the wrong time can worsen jet lag. Consult a doctor before combining melatonin with other medications.
Dry cabin air dries out skin and lips over the course of a long flight, and the discomfort builds gradually. A small moisturiser and lip balm applied mid-flight make the final hours noticeably more comfortable. Contact lens wearers should also pack lubricating eye drops, as low humidity dries lenses faster than normal conditions.
Commercial aircraft cabins maintain 10-20% relative humidity. Most deserts average 20-25%. On older aircraft some sections can drop to 3-7%, making consistent water intake critical throughout the flight.
The human circadian rhythm runs slightly longer than 24 hours, making it easier to delay sleep (westbound travel) than to advance it (eastbound travel). Timed light exposure and low-dose melatonin at the right time are the two evidence-backed tools for reducing adjustment time.
Alcohol, coffee and tea made with onboard tap water, and carbonated soft drinks are the main ones to reduce or avoid. Alcohol dehydrates and disrupts sleep. Coffee and tea brewed onboard use water from tanks that may contain bacteria. Carbonated drinks worsen in-flight bloating caused by expanding cabin gas. Still bottled water is the best choice for staying hydrated throughout the flight.
At most European airports in 2026, each liquid, gel or aerosol container in your carry-on must hold no more than 100 ml, and all containers must fit in a single transparent resealable bag of up to one litre. Some airports with new CT security scanners now allow up to two litres — check your specific departure airport's official guidance before packing.
Walk the aisle every one to two hours, do ankle rolls and calf raises while seated, choose an aisle seat where possible, stay well hydrated, and wear loose clothing that does not restrict circulation in your legs. Passengers at higher risk — including those with prior DVT, recent surgery, pregnancy, active cancer, or taking oestrogen — should consult a doctor before travel about compression stockings or other measures.
Set your watch to the destination time zone at boarding and align your sleep and wake times to that clock immediately. Shift your bedtime 30-60 minutes per day toward the destination zone in the two to three days before departure. Use timed light exposure after arrival: seek morning light for eastbound travel, late afternoon or evening light for westbound. A low dose of melatonin (0.5-1 mg) taken at the new time zone's bedtime can also help — avoid doses above 5 mg.
Aim for approximately 240 ml (one standard glass) of water per hour of flight. Cabin humidity sits well below the levels found in normal indoor environments, so your body loses fluid faster than usual through breathing and skin. Carry an empty reusable bottle to fill after security and ask cabin crew for regular refills between service rounds.
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