Long-haul flying has become a near-unavoidable part of modern life, yet most passengers board without any real plan. Long-haul flights, typically defined as flights lasting over six hours, present unique challenges to passengers due to factors such as altitude, fatigue, disruption of circadian rhythms, and prolonged immobility. The good news is that a handful of consistent, simple habits can change everything about the experience. None of them require a business class upgrade.
1. Stay Relentlessly Hydrated
While normal indoor humidity ranges between 30 and 60 percent, cabin air can drop as low as 10 to 20 percent, a level that is drier than most deserts on Earth. That extreme dryness hits you fast. Approximately 70 percent of the human body is made up of water, and in the standard airliner environment, individuals lose approximately eight ounces of water per hour, mostly from normal breathing. The physical effects stack up quickly, too. Without adequate fluid intake, dehydration can lead to fatigue, dizziness, and decreased cognitive function.
Airplane cabins have very low humidity levels because about 50 percent of the air circulating in the cabin is pulled from the outside, and at high altitudes, the air is almost completely devoid of moisture. This can cause your throat, nose, and skin to feel dry. Experienced Air India cabin crew member Hufriya Bhivandiwalla highlights that aircraft cabins are dry, which accelerates dehydration and contributes to exhaustion, and passengers are advised to drink at least one and a half liters of water during the flight and carry a personal bottle to refill regularly. Beyond water intake, experts recommend drinking a minimum of eight ounces of water for each hour in the air and avoiding alcohol and caffeine, which will only dehydrate you further. Contact lens wearers should also note that lengthy air travel can dry out eyes, especially for people who wear contact lenses, and the Mayo Clinic recommends that air travelers wear eyeglasses instead of their contact lenses.
2. Move Your Body – Even in Your Seat
By far the biggest risk to the body on a long-haul flight is deep vein thrombosis (DVT), or getting a blood clot in the legs. If a blood clot moves from the legs to the lungs, it can become a life-threatening problem. The numbers behind this risk are worth knowing. A study undertaken by the WHO found that occurrences of deep vein thrombosis were two to three times more likely following a flight of more than four hours. Sitting still is the enemy. Immobility can increase the risk of DVT. While it’s not proven that flying alone raises the risk, sitting still for more than four hours is unhealthy in any context. To get your blood flowing, you only need to contract your calf muscles, for example by tapping your feet, which also moves your shins, thighs, and hip joints.
The WHO recommends that passengers on board airplanes get up and walk around the cabin or visit the bathroom every two to three hours during long-haul flights to reduce the likelihood of DVT. They also advise against passengers placing baggage at their feet, as this may restrict movement necessary to keep blood circulated to the feet and legs. Compression socks add another layer of protection. A Cochrane review looked at data from 2,918 people in 12 randomized clinical trials and found high-certainty evidence that wearing compression stockings reduced the risk of symptomless DVT when traveling on a flight of more than four hours. Compression socks squeeze at the ankles, with pressure gradually decreasing further up the leg, and the squeezing helps keep blood flowing by forcing blood in the legs to return to the heart.
3. Dress Smart and Layer Up
Flight search website Skyscanner recommends wearing several loose and comfortable layers to adjust your temperature while you fly, since it can be chilly on airplanes. Closed-toed shoes are better than flip flops in an emergency, but travelers are encouraged not to wear shoes that are too snug, since feet can swell at high altitudes. This last point matters more than most people expect. Your feet will swell during a flight, and if your shoe is tight at the beginning of a flight, it will be even more challenging to put on at the flight’s conclusion. The clothing you choose can genuinely set the tone for the entire journey.
Comfortable clothes are a must for any long-haul flight. Choosing breathable fabrics and layers you can adjust depending on the cabin temperature is key. Wrinkle-resistant tops and trousers let you relax without worrying about looking disheveled when you land. Veteran travel experts and frequent flyers back this up consistently. It is vital to bring a full change of clothes while flying. Plane temperatures often jump around, so having layers you can put on and take off will make the experience more pleasant. Experienced travelers often wear a long sleeve, a sweater, a scarf that works as an extra blanket, and a light jacket that can double as a pillow.
4. Build a Proper Sleep Kit
It’s hard to doze off when your head is lolling all over the place and you’re cold. A travel neck pillow supports your head and neck, and a blanket keeps you cozy – these can be real aids in an attempt to fall asleep mid-flight. Sleep on a plane is genuinely difficult to achieve without the right tools. For some reason it’s possible to fall asleep with the lights on and the TV blaring at home, but trying to drift off on a plane is a different story. Noise from fellow passengers and light from nearby screens can prove serious irritants. An eye mask and a pair of noise-canceling headphones give the quiet and darkness necessary for the best chance at rest.
A plain old sleep mask that presses on your eyelids and lets too much light leak in doesn’t really cut it when you’re 30,000 feet up. To cut out the sensory overload, you’ll want a quality mask that blocks everything out and does so comfortably. A blackout mask with an elevated cushion that frames your eyes rather than pressing down on them is the recommended choice. Noise protection is equally important. Planes and airports are incredibly loud environments, and the cheap foam earplugs often handed out on planes don’t cut it. Investing in a pair made for hours of wear that properly blocks out noise makes a significant difference. Compression socks serve double duty here too, helping feel comfortable when sleeping sitting down by improving blood flow and reducing leg swelling.
Watch What You Eat and Drink on Board
Nothing adds to the discomfort of a flight like improper diet. Eating lightly on board and staying away from gaseous foods is important. When flying at high altitude, bodily gases expand by roughly one third, causing aches and uneasiness. This is a factor many travelers completely overlook. While packing food requires some planning and takes up a little more space, bringing your own light bites is a game-changer. Airplane food is not the best, and many travelers feel bloated after eating too much of it. A mix of healthy options like fresh fruit and vegetables alongside a few favorite snack foods is a smart approach, allowing you to fuel up with foods you actually enjoy.
Although it might be tempting to indulge in a glass of wine or cocktail to relax your nerves, avoiding alcoholic or carbonated drinks is wise, as they will only add to dehydration. Snack choices matter, too. Many passengers want to eat before boarding a long flight, but what they eat can dehydrate them. Salty fare, such as the pretzels and potato chips many airlines hand out, can add to dehydration. Carrying on water-rich foods like watermelon, cucumbers, and strawberries is a smart move. Small nutritional choices made before and during a flight can have a surprisingly large effect on how you feel when the wheels finally touch down.
Protect Your Sleep Schedule Before You Even Board
Long flights mean traveling across time zones, and what happens is your circadian rhythms get disrupted. As a result, you might have trouble adjusting and feel tired or just in a bad mood. The preparation you do before reaching the airport can matter just as much as what you do in the air. Getting a good night’s rest before your flight will help your body cope with the demands of travel so you’ll feel better once you get to your destination. If you’re crossing multiple time zones, adjusting your sleep schedule a few days beforehand, getting up an hour or two earlier or staying up later to match the time at your destination, is recommended.
The day before your flight, spending some time at the gym, walking, or stretching in preparation for spending many hours in a sitting position is worthwhile. Making sure you’re well-rested is equally important, as denying yourself sleep in order to be exhausted on the plane can backfire. Physical preparation is not just about comfort but about health. Doing some light exercise before your flight, such as stretching or taking a short walk, will help prevent stiff muscles, keep you more comfortable during the flight, and promote better circulation. Preparing for long hours onboard can feel overwhelming, but small, purposeful habits can make a major difference in how refreshed a traveler feels upon landing. Simple strategies, when applied consistently, can transform extended flights into a comfortable and restorative experience.