Flight Water Intake
Air travel dries you out quickly. This calculator multiplies your flight duration by the amount of water you aim to sip each hour so you know how many liters to bring or request onboard. Enter the hours you will be in the air and the liters per hour you want to consume to see the recommended total.
Educational information, not professional advice.
Examples
- 6 h flight at 0.30 L/h ⇒ 1.80 L total water
- 9.5 h flight at 0.25 L/h ⇒ 2.38 L total water
- 3 h flight at 0.20 L/h ⇒ 0.60 L total water
FAQ
How should I choose the hourly intake rate?
Many travel health guides suggest drinking 0.25–0.33 liters per hour; adjust the value based on your body size, health, and how dry the cabin feels.
Does the calculator factor in coffee, alcohol, or salty snacks?
No. Increase your liters per hour manually if you plan to drink dehydrating beverages or eat salty food during the flight.
Can I use ounces instead of liters?
Convert ounces to liters before entering them. Divide fluid ounces by 33.814 to get liters.
What if I sleep part of the flight?
Enter only the hours you expect to drink water. You can subtract sleep time or long layovers if you will not be sipping regularly.
Additional Information
- Cabin humidity on long-haul flights often drops below 20%, which increases the fluid you lose through breathing.
- Bring an empty reusable bottle to fill after security; 1 liter equals roughly two typical 16.9 fl oz bottles.
- Divide the result by your bottle size to know how many refills you should aim for during the trip.