Traveling with a CPAP is more straightforward than the forums make it sound, but there are a handful of rules and quirks that are worth knowing before you're at a security line in a country you don't speak the language of. This guide covers the actual rules — by airline, by region — and the packing list that has held up across a couple of hundred reader trip reports.
The short answer
CPAP doesn't count toward your carry-on limit on any major airline. TSA doesn't require X-raying the machine separately but allows it on request. Modern CPAPs handle 100–240V automatically, so you usually need only a plug adapter, not a voltage converter. Bring distilled water in the destination, not your luggage.
Airline rules
Under U.S. ACAA and ICAO rules, a CPAP is classified as medical equipment and does not count toward your carry-on allowance. You can bring it in addition to your regular carry-on bag plus a personal item.
Every major U.S. airline (American, Delta, United, Southwest, JetBlue, Alaska, Spirit, Frontier) honors this. Most European and Asian carriers do too, but Ryanair, Wizz Air, and certain low-cost carriers will sometimes try to charge you. The trick: have a printed copy of your prescription or DME letter. Airlines can't legally make a CPAP count as carry-on if you can show it's medical equipment.
Using your CPAP in-flight
Allowed on most aircraft, though you need to coordinate in advance. Most major airlines will ask you to call their medical desk 24-48 hours before the flight; some require a doctor's letter. Your CPAP needs to be FAA-approved (every modern production model is — look for the FAA approval sticker on the back of the unit).
Power is the issue. Most modern aircraft seats have a 110V AC outlet, but not all, and they don't always work reliably. If your flight is over 6 hours and you actually need to sleep with CPAP, bring a CPAP-rated battery pack rated for your machine and pressure setting. The Pilot-24 and EXP96 Pro are the two most-recommended options.
TSA and customs
TSA officially treats CPAP as medical equipment. Practical implications:
- You can leave it in the carry-on bag in most lines, but TSA agents may ask you to take it out and run it through the X-ray separately. Be ready to do this without arguing — it's faster.
- Some agents will swab it for explosives. Completely normal, doesn't hurt the machine, takes 30 seconds.
- TSA PreCheck doesn't change CPAP screening — you'll still get asked to take it out if the agent wants to.
International customs: declare it if asked, but no country we're aware of restricts CPAP entry for personal use. Carry a copy of your prescription if you're going somewhere customs is unpredictable (your destination's airport regulations are searchable on the IATA travel centre).
Voltage and adapters
This is where most users overthink. Modern CPAPs (every model released since roughly 2014) ship with a universal power supply that accepts 100–240V at 50/60 Hz. That covers every country you'd plausibly travel to except for some industrial outlets in remote areas.
Practical implication: you don't need a voltage converter. You only need a plug adapter — a passive device that lets your North American two-prong adapter fit into the wall socket shape used in the country you're visiting. These cost $5-15 and are sold at any travel store.
Common plug types by region:
| Region | Plug type | Notes |
|---|---|---|
| UK, Ireland | Type G | Three-pronged rectangular |
| EU mainland | Type C/F | Two round pins (most common) |
| Italy | Type L | Three pins in a line — different from EU C |
| Switzerland | Type J | Three round pins, recessed |
| Australia, NZ | Type I | Slanted three-pin |
| Japan | Type A | Same as North America |
A universal adapter with multiple plug profiles costs about $20 and covers everything for years. The Insignia or Anker travel adapters are reliable.
Water for the humidifier
The single most common travel question: can you use bottled water from the destination? The honest answer: yes, but distilled is still better. Most hotels in most countries don't sell distilled water — they sell mineral water or filtered water, both of which have dissolved solids that will accumulate in your humidifier chamber.
For trips up to a week, this is fine. The chamber will pick up some mineral deposit but a vinegar soak on return cleans it. For trips longer than two weeks, find a pharmacy that sells distilled water (called "eau distillée" in France, "agua destilada" in Spain, "destilliertes Wasser" in Germany).
Or — and this is what most experienced travelers do — skip the humidifier for the trip. Most users tolerate dry-air CPAP fine for short stretches. Read our article on distilled water and the humidifier for the longer answer.
Packing list
A complete CPAP travel kit, in order of importance:
- The CPAP machine in its travel case (or a padded ziplock if the case is too bulky).
- Power supply with its cable.
- Mask, headgear, and tubing — pack the tube in a separate ziplock to keep it clean.
- One spare cushion — masks pick up grit while traveling and a spare can save a trip if yours fails.
- One spare filter — small, light, cheap. We sell filter packs that travel well.
- Plug adapter for the destination region.
- Copy of your prescription — printed, not on your phone. Useful for airline gate-checks and customs.
- SD card (if your machine uses one) — left in the machine so you don't lose data while away.
- Distilled water option: a 16-oz bottle of distilled water if your trip is short enough that you want to avoid hunting for it abroad.
Travel-specific machines
If you travel a lot, a dedicated travel CPAP is worth considering. Two leading options:
ResMed AirMini
The category-defining travel CPAP. It's the size of a soda can, weighs under a pound, and uses a unique HumidX waterless humidification system that doesn't need water. Therapy performance is genuinely close to the AirSense 11 at typical pressures. The drawbacks: it only works with specific AirMini-branded mask setups, and the small tube can be uncomfortable for the bedside. Best as a second machine for travelers, not as a primary. We carry AirMini-specific filter packs.
Transcend Auto Mini
Battery-friendly travel option that works with most standard CPAP masks. Slightly bulkier than the AirMini but cheaper and less locked-in. Less common, harder to find accessories.
Common travel mistakes
- Forgetting the power cord. The machine itself is portable but the cord is what keeps it running. Most travelers who report a "ruined first night" had a missing cable.
- Packing the CPAP in checked luggage. Don't. Even if it's wrapped in clothes. Always carry-on. Lost luggage with CPAP inside is a worst-case scenario.
- Using a voltage converter unnecessarily. Cheap voltage converters can damage modern CPAP power supplies. If your machine accepts 100-240V (almost all do — check the back of the power adapter), use a plug adapter only.
- Skipping CPAP entirely for trips. Two nights without therapy is almost always more disruptive than the inconvenience of bringing the machine. Pack it.
Bottom line
CPAP travel is genuinely easier than the internet implies. Carry it on. Bring a plug adapter, not a voltage converter. Pack a spare cushion and filter. Use bottled water for the humidifier if distilled isn't available. Get a printed prescription for airline interactions. Build your replacement schedule around your trip so you're not running on a worn cushion mid-vacation.