Traveling with a CPAP machine is straightforward once you know the rules. Your device is classified as a medical assistive device by the U.S. Department of Transportation, which means it doesn’t count as a carry-on bag on most airlines and gets special treatment at airport security. The key is preparation: packing it correctly, sorting out power for your destination, and keeping it clean on the road.
Getting Through Airport Security
The TSA requires you to remove your CPAP machine from its carrying case and send it through the X-ray belt separately. Your mask, tubing, and other accessories can stay in the case. If you’d rather keep the device sanitary, you’re allowed to place it in a clear plastic bag before it goes through the scanner.
Because CPAP machines are medical devices, most airlines do not count them toward your carry-on or personal item limit. Check with your specific airline before flying, since policies can vary, but this is standard across major U.S. carriers. Always carry the machine in the cabin rather than checking it. Checked luggage gets tossed around, and a damaged machine means nights without therapy.
Documents Worth Carrying
You don’t technically need a prescription to get through TSA, but having a letter from your doctor can save you hassle, especially on international trips. A good travel letter states that you’ve been diagnosed with obstructive sleep apnea, that you’ve been prescribed CPAP therapy, and that the device contains no parts that interfere with aircraft operation. Some customs agents in other countries will ask for documentation, and having a letter ready avoids delays or confiscation concerns. Keep a digital copy on your phone as a backup.
Using Your CPAP on the Plane
If you want to use your machine during the flight itself, give your airline at least 48 hours’ notice. Airlines are permitted to require advance notification for assistive devices used onboard. Some carriers also ask you to check in earlier than usual, so confirm the requirements when you call.
Most airplane seats don’t have power outlets, and even when they do, the wattage may not be enough for your machine. Plan on running the device from its own battery if you need therapy during the flight. Your humidifier is the biggest power draw, so turning it off extends battery life significantly. Many travelers skip the humidifier entirely on short to medium flights.
Battery Rules for Flying
If you use an external lithium-ion battery pack with your CPAP, the FAA limits each battery to 100 watt-hours. Batteries between 101 and 160 watt-hours are allowed with airline approval, and you can bring a maximum of two spare batteries in that larger range. Spare batteries must go in your carry-on, never in checked luggage.
Most CPAP-specific battery packs fall under the 100 Wh threshold, so they’re fine without special permission. To check, look at the label on your battery. If it lists voltage and amp-hours instead of watt-hours, multiply the two numbers together. A 14.4V battery rated at 6.4 Ah, for example, comes out to about 92 Wh.
Power and Plug Adapters Abroad
Most modern CPAP machines have a universal power supply that accepts 100 to 240 volts and works with both 50 Hz and 60 Hz electrical systems. This covers virtually every country on the planet. You can verify this by looking at the label on your power brick or checking your user manual for the input voltage range.
If your machine is dual-voltage (and almost all made in the last decade are), you only need a simple plug adapter to fit the wall outlet shape at your destination. These adapters cost a few dollars and don’t change the voltage. A universal adapter kit with multiple plug types is a good investment if you travel internationally more than once. If your machine only accepts a single voltage, such as 120V, you’ll need a voltage converter, which is bulkier and more expensive. This situation is rare with current CPAP models but worth confirming before you leave.
Altitude Adjustments
Air pressure drops at higher elevations, which affects how much pressure your CPAP actually delivers. If you’re heading to a mountain destination or a city well above sea level, your machine may need to compensate. Most current devices have an automatic altitude adjustment setting that handles this without any input from you. Check your machine’s menu or manual to confirm it’s enabled, especially if you’re traveling somewhere like Denver, Mexico City, or Bogotá.
Keeping Your Machine Clean on the Road
Hotel rooms don’t come with dish soap and drying racks, so daily cleaning takes a little more planning while traveling. CPAP-specific wipes are the most practical option. They’re pre-moistened, individually wrapped, and designed to clean your mask cushion and exterior surfaces without soap and water. Some use a simple solution of water and aloe vera extract, avoiding alcohol or solvents that can degrade silicone.
One thing to watch: certain wipes leave a residue that can attract dust or break down mask materials over time. If the packaging says to rinse after use, do so. Wipes are a good travel substitute, but they’re not a permanent replacement for washing your equipment with mild soap and warm water once you’re back home.
Water for Your Humidifier
This is the detail most CPAP travelers overlook. Tap water is not sterile, and using it in your humidifier chamber aerosolizes whatever is living in it directly into your airway. Waterborne pathogens commonly found in municipal water systems, including bacteria responsible for a large share of the estimated 120,000 hospitalizations and 7,000 deaths linked to waterborne illness in the U.S. each year, can thrive in humidifier reservoirs. The risk is higher for older adults and anyone with a weakened immune system.
Distilled water is the standard recommendation. In the U.S., you can find it at any pharmacy or grocery store. Internationally, it may be labeled as “purified” or “demineralized” water at pharmacies. If you absolutely cannot find distilled water, boiling tap water for at least one minute and letting it cool before use reduces (but doesn’t eliminate) the pathogen load. Some travelers simply skip the humidifier for short trips, which is safe for the machine and avoids the water issue entirely, though your throat may feel drier in the morning.
Note that distilled water does not get a medical exemption from the TSA’s 3.4-ounce liquids rule. You can’t bring a full jug through security. Buy it after you land or pick it up at your destination.
Packing Tips That Save Headaches
A dedicated CPAP travel bag is worth the investment. Most are padded, sized to fit under an airplane seat, and have compartments for the machine, mask, tubing, and power supply. If you don’t have a dedicated bag, wrap the machine in a soft item like a shirt and place it in a rigid carry-on where it won’t get crushed.
- Bring your full-size mask and a backup. A spare mask cushion or nasal pillow set weighs almost nothing and saves a trip if your primary one tears or gets lost.
- Pack a short hose. Some manufacturers sell a compact travel hose that’s lighter and easier to coil than the standard six-foot tube.
- Carry a small extension cord or power strip. Hotel outlets are often behind the nightstand or across the room from the bed.
- Download your machine’s data. If you use a compliance tracking app, sync your data before you leave in case the machine resets or has connectivity issues abroad.
If you’re renting a car and driving to your destination, the machine can ride in the cabin of the vehicle rather than the trunk, where temperature extremes can damage electronics or warp plastic components. In hot climates, don’t leave it sitting in a parked car.