Travel Hydration Hub

Flight Hydration

Flight hydration is the practice of maintaining healthy fluid and electrolyte balance before, during and after air travel, where cabin humidity below 20% accelerates fluid loss.

Why does flight hydration matter?

Cabin air is dry by design

Pressurised aircraft cabins typically sit below 20% relative humidity — drier than most deserts. Your body loses water with every breath, faster than at ground level.

Dehydration compounds travel fatigue

Even mild dehydration contributes to headaches, dry skin, sluggish digestion and that "drained" feeling on arrival. Good hydration is the single easiest factor a traveller can control.

Alcohol and caffeine accelerate fluid loss

Both are diuretics, and the dry cabin amplifies their effect. Frequent flyers moderate both in the air.

How do you get flight hydration right, step by step?

  1. 1

    Pre-hydrate

    Start your trip well-hydrated rather than playing catch-up at altitude. Aim for normal daily intake in the 24 hours before departure.

  2. 2

    Around 250 ml per flight hour

    A widely used aviation health guideline: roughly a glass of water per hour in the air.

  3. 3

    Add electrolytes

    Sodium, potassium and magnesium help your body retain and use water effectively. A low-sugar electrolyte stick (like TRAVELYTES™ FLIGHT) is the format frequent flyers prefer.

  4. 4

    Limit alcohol and caffeine

    One drink in the air ≈ two on the ground in terms of dehydration.

  5. 5

    Keep hydrating after landing

    Cabin dehydration does not vanish the moment you step off the plane. Continue for 24-48 hours.

Who is flight hydration for?

  • •Long-haul and short-haul passengers alike
  • •Frequent business travellers
  • •Cabin crew and pilots
  • •Travellers prone to flight tiredness, headaches or dry skin in the air
  • •Anyone flying with infants or children

Cabin water vs sports drink vs electrolyte stick: what works on a flight?

Side-by-side comparison of the three options available to a passenger once the aircraft door closes.

Designed for

Cabin water only
General thirst
Sports drink
Sweat replacement during exercise
TRAVELYTES™ FLIGHT stick
Dry cabin air and travel days

Electrolytes

Cabin water only
None
Sports drink
Mainly sodium, sugar-carried
TRAVELYTES™ FLIGHT stick
Sodium, potassium, magnesium + B-vitamins

Sugar

Cabin water only
None
Sports drink
Typically high
TRAVELYTES™ FLIGHT stick
Low-sugar formulation

Carry-on friendly

Cabin water only
Liquid limits apply before security
Sports drink
Liquid limits apply before security
TRAVELYTES™ FLIGHT stick
Dry powder — no liquid limits

Packed size

Cabin water only
Bottle
Sports drink
Bottle or large scoop tub
TRAVELYTES™ FLIGHT stick
Flat sachet

Availability in the air

Cabin water only
Depends on service pattern
Sports drink
Rarely stocked
TRAVELYTES™ FLIGHT stick
Mixes into any cup or bottle onboard

Recommended product

TRAVELYTES™ FLIGHT

A low-sugar electrolyte stick formulated for in-flight hydration — sodium, potassium, magnesium and B-vitamins in a compact sachet that clears security every time.

View TRAVELYTES™ FLIGHT

TRAVELYTES™ products are food supplements that support normal hydration. They are not medicines and are not treatments for flight tiredness, motion sickness, altitude sickness or any other condition.

Flight Hydration questions travellers ask

Why do I get dehydrated on a plane?

Aircraft cabins are pressurised with very dry air — typically below 20% relative humidity. Your body loses water through breathing and skin much faster than at ground level.

How much water should I drink on a flight?

A widely cited aviation guideline is around 250 ml (roughly one glass) per hour of flight time. Adjust for body size, alcohol intake and cabin temperature.

Do electrolytes help with flight hydration?

Yes — sodium, potassium and magnesium help your body retain and use water effectively. Many frequent flyers add an electrolyte stick to water during the flight.

Will flight hydration prevent flight tiredness?

No single intervention prevents post-flight tiredness — it is largely a circadian-rhythm adjustment to crossing time zones. Hydration supports how you feel during and after a flight but is not a treatment.

Can I bring electrolyte sticks through airport security?

Yes. TRAVELYTES™ sticks are a dry powder, not a liquid, so they are not affected by carry-on liquid limits. Mix one into water bought airside or a cup from the crew.

What to read next on flight hydration

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