How much water do you lose per hour on a flight?

According to Bacheler, the human body loses about 8 ounces of water per hour on an aircraft at altitude, mostly from breathing. As such, the Aerospace Medical Association (AsMA) recommends drinking about 0.25 liters (or 8 ounces) of water per hour while on an airplane.



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Airplanes are controlled environments typically kept at only 10-20% humidity. This is far lower than the 35-65% humidity of normal everyday environments. Lower humidity in the air can lead to quicker dehydration.

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12 Tips (and Carry-On Essentials) for Surviving a Long-Haul Flight
  1. Buy your ticket as early as possible. ...
  2. Wear your most comfortable outfit. ...
  3. Invest in a good travel pillow, earplugs, and sleep mask. ...
  4. Pack your own headphones. ...
  5. Take the smallest personal item you can. ...
  6. Bring your own snacks, or buy some before boarding.


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Once you've landed, you can use a lot of the same tools to reduce swelling after your travel: “Stay hydrated, move around, and wear compression socks,” says Wurster. “Also, be mindful of what you're eating and avoid foods too high in sodium because that can also add to further swelling.”

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Hydrate, hydrate, hydrate. To combat this, start hydrating even before your trip, then during your travel day and after. If you're flying, drink at least 12 ounces of water every hour, recommends Jordan Crofton, a nurse practitioner and director of patient care at the Well. She also adds electrolytes to her water.

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Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.

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Air pressure is lower at higher altitudes, which means your body takes in less oxygen. Airlines “pressurize” the air in the cabin, but not to sea-level pressures, so there's still less oxygen getting to your body when you fly, which can make you feel drained or even short of breath.

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Lower oxygen levels contribute to the fatigue you're feeling. Because plane cabins are pressurized to simulate a 6,000-8,000 feet elevation, your blood absorbs less oxygen at those altitudes. This can cause dizziness, sleepiness, and a lack of mental sharpness.

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Drink Plenty of Water
Try drinking 8 ounces (237 ml) every hour while in flight; this will help keep your body functioning optimally while also offsetting any dehydration caused by breathing in dry aeroplane air.

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The Airport and Airplanes are Full of Germs Airplanes are just as dirty. Studies have shown bacteria and viruses living on armrests, seat belts, window shades, tray tables, toilet handles, and more for DAYS.

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“While plain water is best for staying hydrated, other drinks and foods can help, too,” says Theunissen. “Fruit and vegetable juices, milk and herbal teas add to the amount of water you get each day.” Consider bringing your own herbal tea bags while flying.

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Prioritize rest. After a serious time-zone change, “I love to take a nap,” says Kristal Hicks of Top Tier Travel Group. Even if you're someone who can sleep on planes, a proper nap in a bed feels more restful, because you get to extend your body, Hicks says.

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Jet lag is a temporary sleep disorder, but not temporary enough for many travelers. If you're flying from San Francisco to Rome for a 10-day trip, for example, it may take six to nine days to fully recover. That's because it can take up to a day for each time zone crossed for your body to adjust to the local time.

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Drink enough water According to the World Health Organization (WHO), you should drink about 250 ml of water per hour of flight time, or more if you feel thirsty. Avoid alcohol, caffeine, and sugary drinks, as they can dehydrate you and disrupt your sleep cycle.

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They're not glamorous, but they're very comfortable, with padded bunks and sometimes even in-flight entertainment! With 14- to 18-hour flights no longer unusual, pilots and cabin crew have legally mandated rest times —and airlines also realise that a rested, refreshed crew member is a happy crew member.

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Remember that anything over 6 hours flying time is considered long haul, but flights of longer than 10 hours are not uncommon either. One important thing to remember is to keep your seat belt fastened at all times in case of unexpected turbulence.

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Crew require a minimum of three hours rest when the flight duty period exceeds 14 hours (from when crew 'sign on' to 15 minutes after engines off). For flight duty periods longer than 18 hours, 4.5 hours bunk rest is required. The crew take turns for rest breaks. The first group will rest after the first meal service.

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