How To Not Get Sick On A Plane

The Recycled Air Myth

Airplane air is actually cleaner than the air in most office buildings. Modern aircraft use HEPA filters that capture 99.97% of airborne particles, including bacteria and viruses. The cabin air is completely refreshed every 2-3 minutes — far more frequently than a typical indoor space.

So why do people get sick after flying? It's not the air. It's the surfaces, the close quarters, the dehydration, and the stress of travel. Here's how to fight back against all of it.

Wipe Down Everything You Touch

This is the single most important thing you can do. Your tray table is dirtier than the airplane bathroom.

A TravelMath study found that tray tables have 2,155 colony-forming units of bacteria per square inch — more than eight times the amount found on lavatory flush buttons. An Auburn University study found that MRSA can survive on tray table surfaces, and E. coli can live on armrest material for up to 96 hours.

The reason is simple: cleaning crews between flights don't have time to disinfect every surface. Your tray table might have been a diaper-changing station on the last flight. Seriously.

What to Wipe Down

Pack antibacterial wipes (Clorox, Lysol, or any brand with at least 60% alcohol) and clean these surfaces as soon as you sit down:

• Tray table — top and bottom, plus the latch
• Armrests — both of them, including the ends
• Seat belt buckle
• Air vent knob
• Window shade handle
• Seat-back screen (if there is one) — touchscreens are germ magnets
• Seat pocket — or better yet, don't put anything in there. One study found seat pockets harbored MRSA for up to 7 days

Takes 30 seconds. Worth every one of them.

Pick a Window Seat

A 2018 study published in the Proceedings of the National Academy of Sciences found that passengers in window seats had significantly less contact with other people during flights. Window seat passengers were far less likely to get up, and fewer people walked past them.

The logic is straightforward: fewer interactions with other people means fewer chances for germs to reach you. Aisle seat passengers get bumped and brushed by everyone walking to the bathroom. Middle seat passengers are sandwiched between two potential germ sources.

If you can book a window seat, do it. And once you're there, try to stay put as much as possible.

Keep Your Air Vent On and Pointed Down

This one surprises people, but your overhead air vent is your friend. Turn it on and aim it so the air flows straight down in front of your face.

The directed airflow creates a small cone of cleaner air around you, pushing airborne particles away before they reach your nose and mouth. It's not a force field, but it does provide a measurable layer of protection. The air coming from those vents has been through the HEPA filtration system, so it's among the cleanest air on the plane.

Don't crank it to maximum — a gentle, steady flow is all you need. You don't want to dry out your eyes and nasal passages either.

Stay Hydrated — Actually Hydrated

Airplane cabins typically have humidity levels of 10-20%, compared to 30-60% in a normal home. That dry air dries out your mucous membranes — the linings of your nose, throat, and airways that serve as your body's first line of defense against germs.

When those membranes dry out, they're less effective at trapping and expelling pathogens. That's why your throat feels scratchy after a long flight.

Hydration Tips

• Drink water before, during, and after your flight. Aim for about 8 ounces per hour of flight time.
• Bring an empty water bottle through security and fill it at a water fountain before boarding. You'll drink more when it's easily accessible.
• Skip alcohol and coffee. Both are diuretics that increase dehydration. If you want to drink on the plane, match every alcoholic drink with a full glass of water.
• Consider saline nasal spray. A few spritzes keep your nasal passages moist. This isn't paranoia — flight crews do this regularly.

Hands, Hands, Hands

Your hands are how most germs actually enter your body. You touch a contaminated surface, then touch your face — eyes, nose, or mouth — and the pathogen gets in.

• Wash your hands with soap and water whenever possible. It's more effective than hand sanitizer at killing certain germs, including norovirus.
• Use hand sanitizer (at least 60% alcohol) when you can't get to a sink. Apply after touching common surfaces, before eating, and after using the lavatory.
• Stop touching your face. This is harder than it sounds, but it's one of the most effective things you can do. The average person touches their face 16-23 times per hour.

Consider Wearing a Mask

A well-fitted N95 or KN95 mask filters out airborne particles effectively. If you're immunocompromised, traveling during flu season, or sitting near someone who's visibly sick, a mask is a smart move.

Even a surgical mask provides some protection against larger respiratory droplets. It also keeps you from touching your nose and mouth, which is a secondary benefit people don't think about.

You don't have to wear it the entire flight. Put it on during boarding (when the ventilation system is often running at lower capacity), during food service (when your tray is down and you're most likely to touch contaminated surfaces then your food), and if someone near you is coughing or sneezing.

Boost Your Immune System Before You Fly

Your body's ability to fight off germs depends heavily on how well you've taken care of it in the days before travel. Travel stress, sleep deprivation, and poor diet all suppress your immune system.

• Sleep well the night before. Sleep deprivation is one of the biggest immune suppressors. Get 7-8 hours.
• Stay current on vaccinations. The CDC recommends annual flu shots, COVID boosters, and RSV vaccines for eligible individuals. Get these at least two weeks before travel so your body has time to build antibodies.
• Consider vitamin C and zinc. Studies suggest that 1,000mg of vitamin C daily may reduce the likelihood of catching a cold in people under physical stress (like travelers). Zinc lozenges may help if you take them at the first sign of symptoms.
• Don't skip meals. Your immune system needs fuel. Eat something nutritious before your flight.

Avoid the Bathroom (If You Can)

Airplane lavatories are small, high-traffic, and hard to keep clean. Every surface in there has been touched by dozens or hundreds of people.

If you're on a short domestic flight (under 3 hours), try to use the airport bathroom before boarding and skip the airplane lavatory entirely. On longer flights where that's not realistic, use hand sanitizer after touching any lavatory surface, and don't touch your face until you've cleaned your hands.

What About Motion Sickness?

Getting sick on a plane isn't always about germs — motion sickness is real and miserable. If you're prone to it:

• Sit over the wing. This is the most stable part of the aircraft with the least movement.
• Look at the horizon or a fixed point. The disconnect between what your eyes see and what your inner ear feels causes nausea.
• Take Dramamine or meclizine 30-60 minutes before the flight. These are over-the-counter and effective.
• Avoid heavy, greasy food before and during the flight.
• Ginger works. Ginger ale, ginger candy, or ginger supplements can help settle your stomach.
• Keep the air vent blowing on your face. Cool air helps reduce the sensation of nausea.

The Post-Flight Routine

Your germ-fighting doesn't end when you land:

• Wash your hands thoroughly as soon as you get to an airport bathroom
• Change clothes when you reach your destination, especially after a long-haul flight
• Take a shower to wash off whatever you picked up in the recycled cabin environment
• Stay hydrated for the rest of the day — your body needs to rehydrate after hours of dry cabin air

The Bottom Line

The biggest threats aren't the air — they're the surfaces, the dehydration, and the close proximity to other passengers. Wipe down your seat area, pick a window seat, keep your air vent on, hydrate aggressively, and wash your hands constantly. These aren't extreme measures. They're simple habits that dramatically reduce your chances of bringing home something besides souvenirs.