Key Takeaways
Your fluid needs can change with factors like heat, physical activity, illness, etc., so no blanket hydration target works for every situation.
Airplane cabins are very dry, but dry mouth and skin do not necessarily mean you are overly dehydrated.
Keep water accessible and drink regularly instead of trying to catch up all at once later.
Electrolytes can be useful during more active times or lots of sweating, but plain water works perfectly well for most everyday situations.
Knowing how to stay hydrated while traveling does not require obsessively tracking every ounce throughout the day. A few easy, practical habits can go a long way, especially on longer flights, road trips, and the more active or unpredictable days when your usual routine never had a chance to begin with.
Hydration is simply the balance between the fluids your body takes in and the fluids it loses throughout the day. Travel can disrupt that balance because your normal eating and drinking routine changes, sometimes for hours at a time. You may drink less when you're in transit, while warmer weather or extra activity like walking around more than usual can increase how much fluid you lose. Put those together, and you could easily end up dehydrated.
There isn't one universal hydration amount or target that applies to every person or every trip. Your needs can shift based on the climate and how active you are, but also what you eat—the National Academies of Sciences, Engineering, and Medicine estimates that about 20% of total water intake in a typical U.S. diet comes from food.1 So, changes to what you may normally eat can affect how much fluid you're getting, too.
Thirst is just one cue that you need to drink something. Thirst, dry mouth, and darker urine are common reminders to drink more water.2 But it's better not to let things get to that point in the first place. Getting adequate hydration while traveling means keeping up with what your body is losing as your routine and surroundings change. In most cases, that simply means reminding yourself to drink more than you might at home to help offset any factors that may be working against you.
Yes, that familiar post-flight dryness is real—airplane cabins feel dry because they are. Cabin humidity is typically around 10% to 20%, which can dry out your eyes, nose, and throat.3
A few simple habits can make drinking water on a plane easier:
Road trips can present a different problem: sometimes people deliberately drink less because they do not want to stop. That's pretty understandable, but in the end, cutting back to avoid bathroom stops can leave you thirsty, dry-mouthed, lightheaded, or dealing with a headache literally down the road.
It's better to drink normally and plan a few stops along the way than to go hours without much fluid. Keep a bottle within reach and always drink with meals and snacks. Foods such as fruit, yogurt, and soups can help contribute to your total fluid intake, too.
The more outdoor-oriented days during your trip can leave you more dehydrated than you realize, especially if you end up walking more than expected or spending lots of time in hot weather. You may be losing more fluid through sweat without really noticing it at first.
For most normal outings, sticking with plain water is perfectly fine (but you still need to be intentional with drinking it). If you're out for hours and sweating a lot, electrolytes can help replace some of what you're losing along with that water.5
There's no need to overcorrect, though. Drinking huge amounts of plain water isn't actually better, and in extreme cases it can dilute sodium levels in the blood.5 Drink steadily, and if the day turns hotter or more active than planned, just adjust from there.
Travel can easily throw off how often you drink. You may also be more active than usual or spending more time in hot weather. On flights, the very dry cabin air can make your mouth and eyes feel noticeably dry even if you are not seriously dehydrated.3,4
The so-called “10-gulp rule” is basically a reminder to take 10 gulps of water whenever you pick up your bottle. It's not an official hydration guideline, and obviously, one person's gulp may be very different from someone else's. It's better to drink regularly throughout the day and pay attention to what your body needs.
You usually do not need electrolytes for a normal travel day. Plain water is usually enough. They may be more useful if you have been sweating heavily during extended physical activity.5,6
Staying hydrated is definitely helpful, but water alone won't stop you from getting sick. Good hand hygiene and being mindful about what you eat and drink are helpful travel practices. You should also double-check any health guidance for your destination before you go. .
Thirst is an obvious sign, but dry mouth, headaches, and darker urine can also mean you need more fluids.2 If you start feeling faint or confused, that can point to something more serious and is worth getting medical attention.2