Traveling With CPAP: Flights, Batteries & Overseas Voltage Guide | Ueno Snoring Clinic

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Reviewed by Our Director

Kazuyuki Sugaya

Director, Ueno Snoring Clinic / Anesthesiologist

Our director, with over 20,000 general anesthesia cases, focuses primarily on the diagnosis and treatment of snoring and sleep apnea, offering care tailored to each patient. [Insurance-Covered] Ueno Snoring Clinic

This article was reviewed by our Director, Kazuyuki Sugaya, and draws on his own experience to explain what CPAP users should know about carry-on rules, overseas power compatibility, and hotel considerations when traveling for business or leisure.

Our director’s book, “Curing Snoring with the Latest Treatments” (No.1 Amazon Bestseller in General Medicine, No.1 in Clinical Internal Medicine, No.2 in Home Medicine & Health) covers this topic in detail as well

New Book by Our Director

“Curing Snoring with the Latest Treatments”

A guide to the latest snoring treatments, written by an anesthesiologist who has overseen the sleep of more than 10,000 patients.

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Quick Answer: CPAP Can Be Carried on Both Domestic and International Flights

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We Asked a Current Flight Attendant About Managing Sleep Apnea in Flight

A current flight attendant shares the real-world details of bringing CPAP on board.

CPAP is a treatment-related piece of medical equipment and is recognized as permitted carry-on baggage. On both domestic and international flights, the basic rule is to always carry it on as hand luggage rather than checking it. Checked baggage carries a risk of damage or loss, and isn’t well suited to a precision device like CPAP.

A doctor’s letter or medical certificate isn’t universally required, but if you want to use in-flight power, or you’re bringing a larger model, advance contact with the airline may be necessary. Rather than worrying over whether you can bring it at all, it’s reassuring to first check your specific airline’s policy on medical equipment.

In the next sections, we’ll walk through the specific procedures for domestic and international flights.

Carrying CPAP on Domestic Flights (JAL/ANA)

On domestic flights, both JAL and ANA generally allow CPAP to be carried on board as medical equipment, and a doctor’s letter or advance notification isn’t universally required. That said, advance consultation is recommended if you’d like to use power at your seat, or depending on your specific model.

On ANA, CPAP is listed as the only medical device that can use the in-seat power supply, and it can be used except during takeoff, landing, taxiing, and while parked (the humidifier function cannot be used in flight). If you plan to use seat power, it helps to contact the “Accessibility Desk” before booking with your device’s model name, manufacturer, part number, and battery type.

If you’re bringing your own battery, airlines generally advise preparing enough capacity to cover roughly 150% of your flight time. For larger devices that won’t fit in the seat’s storage space, purchasing an additional seat may sometimes be necessary.

Personally, even on short domestic flights where advance notice isn’t required, I always bring a fully charged battery, and I make a point of self-declaring “this is a CPAP, a medical device” at security. That alone tends to keep the screening process moving smoothly.

What to Know When Carrying CPAP on International Flights

International flights require more caution than domestic ones, since policies vary more widely between airlines. Most airlines recognize CPAP as permitted medical equipment for carry-on, but some airlines may require an English-language medical letter (a “travel letter”), manufacturer information, or the model name, part number, and battery capacity to be submitted in advance.

Some airlines operating long-haul international routes may request advance notification up to 72 hours before boarding, so we’d recommend checking the airline’s official website for its medical-equipment policy one to two weeks before departure. Having your doctor prepare an English-language letter (noting that you use CPAP, the model name, and a summary of your condition) also brings peace of mind at security checks abroad.

At the security checkpoint, the standard approach is to place the CPAP unit alone in a tray and self-declare, “This is medical equipment — a CPAP.” Being able to show an English-language manual or letter helps the check go smoothly. Keeping your battery and AC adapter somewhere easy to reach also helps you avoid scrambling during the check.

Basic Carry-On Rules and How to Think About Batteries

CPAP’s lithium-ion battery is treated by most airlines as “carry-on only — not permitted in checked baggage.” This isn’t specific to CPAP batteries — it’s a rule that applies to portable batteries in general. If you’re bringing a spare battery, always pack it in your carry-on.

Regarding in-flight power use, even on flights with an outlet at your seat, you generally can’t use it during takeoff, landing, taxiing, or while parked — this applies to both domestic and international flights. Since you won’t be using CPAP during these periods, and power availability won’t cover the entire flight, it’s reassuring to keep some margin in your battery capacity.

The heater function of a humidifier is generally not usable, or not recommended, in flight. Using CPAP without humidification for a short period usually isn’t a major issue, but if dryness bothers you, many people manage it with moisturizing cream or by adjusting the mask.

Overseas Voltage and Plugs — Do You Need a Converter?

A common worry when traveling abroad is whether CPAP might be damaged by a different voltage. The short answer: most CPAP models currently sold use a “multi-voltage” power supply that automatically switches within the 100–240V range. Check the input voltage (INPUT) label on the unit or its AC adapter — if it shows something like “100–240V,” a voltage converter is generally unnecessary.

What you will need is a plug adapter to match the outlet shape. Since plug shapes vary by destination (Type A, BF, C, SE, and others), it’s reassuring to check the plug shape for your destination beforehand and bring a multi-adapter that covers several shapes. Some humidifier heater components may have a different supported voltage than the main unit, so it’s worth double-checking the manual just in case.

Personally, when I travel internationally, I skip the voltage converter altogether and just bring a compact plug adapter. Being able to cut down on luggage that way is a small but genuinely helpful convenience.

Why “AirMini” Is a Good Choice for a Travel CPAP

Carrying your everyday CPAP unit around inevitably takes up space. For those who travel or take business trips frequently, a travel-sized CPAP like ResMed’s “AirMini” is worth considering. The AirMini measures roughly 13.6cm x 8.4cm x 5.3cm and weighs about 300g — just a bit larger than a smartphone — making it easy to fit into a carry-on bag.

Its power supply supports 100–240VAC, so it can be used abroad without a voltage converter. It also uses a waterless humidification system called “HumidX,” which is relatively convenient in flight or in dry environments. Many units also run quietly, which can be a thoughtful consideration if you’re sharing a hotel room.

That said, travel CPAPs like the AirMini can differ from your home unit in pressure range or mask compatibility, depending on the model. Before switching, we’d recommend checking with your doctor or equipment provider whether it’s compatible with your current model and prescribed pressure. Ueno Snoring Clinic is happy to advise on introducing a travel CPAP as well.

What to Watch for Using CPAP at a Hotel

The first thing to check when using CPAP at a hotel is whether there’s an outlet near the bed. Especially at hotels abroad, it’s not unusual for the only outlet to be located far from the bed. Bringing a single extension cord gives you more flexibility in setup and peace of mind.

If you use a humidifier, we’d recommend using bottled or distilled water rather than tap water when traveling abroad. Water quality varies by region, and minerals can build up inside the humidifier more easily in some areas. Using bottled water purchased in-flight, or picking some up at a convenience store or supermarket the day before, works well.

Some accommodations also have a limited number of outlets. Bringing a small power strip helps avoid having to choose between charging your phone and running your CPAP. I personally keep a small power strip with an extension cord in my travel pouch whenever I’m on a business trip.

Bonus: The Same Preparation Helps With Disaster Power Outages, Too

We’ve focused on travel so far, but the mindset of “how do I keep using CPAP without a guaranteed power source” applies directly to preparing for a power outage during a disaster. If a power outage occurs due to an earthquake, typhoon, or similar event, CPAP won’t function without power, which is why it’s important to keep a portable power source or battery on hand as everyday preparedness.

A battery or portable power source you’ve prepared for travel can double as an emergency power source in a disaster. Likewise, a portable power source you’ve bought for disaster preparedness can also come along on trips — letting you cover both needs without adding extra luggage.

If a power outage would stop your CPAP, we cover how to choose a portable power source and the capacity you’d need in a companion article on our Japanese-language site.

Checking your battery before a trip doubles as a good moment to review your disaster preparedness. Making a habit of checking, a few times a year around travel or business trips, whether your battery charges properly and has enough capacity is a reassuring routine to build.

What Ueno Snoring Clinic Offers

Ueno Snoring Clinic is a Sleep Disorder Medicine clinic specializing in snoring and sleep apnea syndrome. CPAP treatment doesn’t end once it’s started — for patients whose lifestyle involves frequent travel or business trips, we offer ongoing support, including model selection and travel accessory recommendations.

If you travel often for work and feel uneasy about carrying CPAP, are interested in switching to a travel model like the AirMini, or are concerned about managing CPAP after an overseas relocation, please feel free to bring it up at your next visit.

Summary: With the Right Preparation, CPAP Doesn’t Have to Get in the Way of Travel

As medical equipment, CPAP can be carried on both domestic and international flights. Domestic flights don’t require advance notice as a rule, though it’s reassuring to contact the airline ahead of time if you plan to use in-flight power; on international flights, some airlines may ask for documentation like a medical letter. As for overseas voltage, most models support 100–240V, so a converter isn’t needed — a plug adapter is enough.

If you have an upcoming trip or travel frequently for work, it helps to add checking your airline’s policy, charging and checking your battery capacity, and preparing a plug adapter to your pre-trip checklist. We hope you can keep up with your CPAP treatment while still fully enjoying your travel and business trips.

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