Nutrition
Flight Dehydration Prevention
Flight dehydration prevention uses hourly sips, sodium, and alcohol limits to offset dry cabin air—thirst lags behind actual fluid loss in the air.
Flight dehydration prevention counters dry cabin air and low humidity that blunt thirst—sip water every hour awake, limit alcohol, and add sodium on flights over three hours. Aim for pale yellow urine after landing; body weight checks help frequent flyers calibrate.
Caffeine in moderation is fine with fluids.
Common questions
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How much water should you drink on a long flight?
Many adults benefit from roughly eight to twelve ounces per hour awake, adjusted for size and sweat before boarding—not one giant chug then nothing. Pair with salty snacks or electrolytes on flights over three hours.
Related terms
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