Rules depend on the carrier, route, aircraft and device. This guide focuses on U.S. travel; verify the requirements for every airline and any international connection.
Does a CPAP count as a carry-on?
Under U.S. Department of Transportation guidance, small assistive devices such as CPAP machines do not count against an airline’s carry-on limit when carried and stowed as assistive devices. Space and safety requirements still apply. See the DOT stowage guide. Check the carrier’s procedure, especially if you place nonmedical items in the device bag or travel internationally.
Keep your machine, mask and essential supplies with you where possible. Empty and dry the humidifier chamber before packing to prevent leaks. A copy of your prescription and the manufacturer’s device documentation can help resolve questions.
At airport security
Tell the screening officer you are carrying a CPAP and follow their instructions; the machine may need separate screening. Allow extra time. For water and other liquids, check current TSA requirements before flying and declare any medically necessary liquids for screening. Do not assume that every bottle of distilled water automatically qualifies for an exception.
Can you use a CPAP during the flight?
Often, yes, subject to airline and aviation safety requirements. Ask the airline about electromagnetic compatibility documentation, advance notice, seating and whether your particular device may be used onboard. The DOT guidance on respiratory assistive devices describes U.S. carrier obligations.
Ask specifically about power. Some carriers do not guarantee seat power or allow medical equipment to rely on it. If a battery is required or recommended, confirm that it is compatible with your machine and provides enough runtime for your itinerary. Heated humidification and heated tubing can reduce battery runtime; discuss any change in setup with your equipment provider or clinician.
CPAP battery rules
For ordinary lithium-ion portable-device batteries, FAA guidance generally permits batteries up to 100 watt-hours (Wh); larger batteries over 100 Wh up to 160 Wh require airline approval, and batteries over 160 Wh are prohibited on passenger aircraft. There are special rules for certain devices, and airlines or international regulators may be more restrictive. Check the FAA’s current lithium battery guidance and your carrier before traveling.
Spare lithium batteries and power banks belong in carry-on baggage, protected against damage and short circuits. If a carry-on is checked at the gate, remove spare batteries and keep them in the cabin. The FAA’s baggage guidance explains these precautions.
Before-you-fly checklist
- Confirm onboard use, seating and power with each airline.
- Verify the device documentation and any requested medical paperwork.
- Check battery watt-hours, compatibility, runtime and carrier approval.
- Pack the mask, tubing, power adapter and necessary supplies in your carry-on.
- Empty the water chamber and check security rules for liquids.
Shopping for a smaller machine? Compare device compatibility, mask options and ongoing supply costs. Explore ResMed options; Yawnder may earn a commission. Confirm all product and airline requirements independently.
Frequently asked questions
Does every airline provide power for CPAP?
No. Ask your carrier and prepare an approved battery if needed.
Is every CPAP automatically approved for every flight?
No. Device compatibility and airline procedures must be checked for your particular itinerary.
Can spare batteries go in checked luggage?
Spare lithium batteries and power banks must be kept in the cabin under FAA guidance and protected from short circuits.