Can You Fly With a Lung Condition? Safety, Oxygen & Fit-to-Fly Advice

Can You Fly With a Lung Condition?

Yes — many people with a stable lung condition can fly safely. However, air travel can place extra strain on breathing because aircraft cabins are pressurised to an altitude where less oxygen is available than at sea level. If you have significant breathlessness, use oxygen, have recently had a flare-up or hospital admission, or have previously struggled during a flight, speak to your GP or respiratory team before travelling.

Conditions that may need extra planning include COPD, pulmonary fibrosis, bronchiectasis, severe asthma, pulmonary hypertension, cystic fibrosis and other chronic respiratory diseases. The advice is individual: two people with the same diagnosis may have very different oxygen requirements and fitness to fly.

Asthma + Lung UK advises that most people with a lung condition can fly, but recommends discussing travel plans with a healthcare professional before booking. The British Thoracic Society also advises that assessment should consider symptoms, exercise capacity, recent exacerbations, previous flight experience, medication, equipment, journey length and the destination itself. Read Asthma + Lung UK’s current travel guidance.

Why Can Flying Make Breathing More Difficult?

Commercial aircraft cabins are pressurised, but not to the same pressure as sea level. The lower cabin oxygen pressure means your blood oxygen level can fall during a flight. For most healthy passengers this causes no problem, but someone with limited respiratory reserve may become more breathless or need supplemental oxygen.

This is why a normal oxygen reading taken at home does not always tell the whole story. In some patients, a respiratory specialist may recommend a hypoxic challenge test — sometimes called a fit-to-fly or pre-flight oxygen test — to estimate whether additional oxygen will be needed in the cabin.

What Is a Hypoxic Challenge Test?

A hypoxic challenge test simulates the lower oxygen level experienced in an aircraft cabin while healthcare professionals monitor your response. It is primarily used to help decide whether you need in-flight oxygen and at what level; the British Thoracic Society specifically notes that it is not, by itself, a complete test of whether someone is medically fit to travel.

If your GP or respiratory specialist thinks you may need one, arrange it well before your trip. Asthma + Lung UK notes that these tests may take several weeks to arrange and are not routinely available everywhere on the NHS. See the current hypoxic challenge test guidance.

Who Should Get Medical Advice Before Flying?

You should seek individual medical advice before flying if your respiratory condition is unstable or if you are unsure how cabin conditions may affect you. In particular, speak to your GP, respiratory team or treating specialist if:

• your breathlessness has recently become worse;
• you have had a recent chest infection, exacerbation or hospital admission;
• you already use oxygen at home or when walking;
• you have previously become very breathless or unwell during a flight;
• you use non-invasive ventilation, CPAP or other respiratory equipment and may need it during travel;
• you have significant heart disease or another condition that could affect oxygen delivery;
• you are planning a long or complex journey with connections, high-altitude destinations or limited medical facilities.

If you have COPD specifically, our separate guide explains flying with COPD in more detail.

Can You Fly With Oxygen?

Yes, many passengers can fly with supplemental oxygen, but it must be arranged in advance. Airlines have different rules on what equipment is accepted, whether they provide oxygen themselves and what medical paperwork is required.

Portable Oxygen Concentrators on Aircraft

A portable oxygen concentrator (POC) can be suitable for some travellers, but the specific device must be accepted by the airline and appropriate for your prescribed oxygen requirement. Airline policies vary, so never assume that a device accepted on one journey will automatically be accepted by another carrier.

If you use a POC, plan for the whole journey — not only the scheduled flying time. You may need sufficient battery capacity for check-in, boarding, the flight, connections and foreseeable delays. Our guide to flying with a portable oxygen concentrator covers the practical issues in more detail.

If you need an approved unit for a forthcoming journey, SkyCare also offers portable oxygen concentrator hire for travellers who require oxygen support without purchasing their own equipment. The appropriate device and airline requirements should be confirmed before travel.

Do I Need Airline Medical Clearance?

Possibly. If you need oxygen, medical equipment or additional clinical support, the airline may ask for medical information or a MEDIF form before approving travel. The UK Civil Aviation Authority advises passengers with medical requirements to contact the airline in advance and check its specific rules. See the CAA’s current air-travel health guidance.

Airport Assistance Can Reduce Breathlessness Before the Flight

Long walks through terminals, queues and carrying luggage can be more difficult than the flight itself for someone with a respiratory condition. Airport special assistance can include help from an assistance point, wheelchair transport through the terminal and support with boarding.

The CAA recommends requesting assistance when booking or at least 48 hours before departure where possible. Assistance is available even if you do not normally use a wheelchair. Read the CAA assisted-travel guidance.

What Should You Carry in Your Hand Luggage?

• Your usual inhalers and essential medicines, with enough supply for the journey and reasonable delays.
• A copy of your prescription or medication list.
• A medical letter where useful, particularly if carrying oxygen or specialist equipment.
• Any reliever medication where this forms part of your treatment plan.
• Approved batteries and accessories needed for portable medical devices.
• Contact details for your insurer and treating healthcare team.

Do not put medication you may need during the journey solely in checked baggage. If you use CPAP, a nebuliser or another powered device, check both the airline’s medical-equipment policy and battery rules before travel.

Should You Delay Flying After a Chest Infection or Flare-Up?

Sometimes. If your symptoms are significantly worse than usual, you have a fever, your oxygen requirement has changed, or you have recently needed hospital treatment, do not rely on generic online advice to decide that you are fit to fly. Your treating clinician should assess whether your condition is stable enough for travel.

If the problem is specifically bronchitis or a recent chest infection, see our guide: Can you fly with bronchitis or a chest infection?

What If You Are Abroad and Too Unwell to Fly Home Normally?

Being discharged from hospital does not automatically mean you can manage a normal passenger journey. If you are medically stable but need professional support, a commercial medical escort may be appropriate. For patients who need continuous monitoring, higher levels of oxygen, specialist equipment or critical-care support, a private air ambulance may be more suitable.

SkyCare can also coordinate the ground transfers at each end as part of a bed-to-bed medical transfer. The transport method should be chosen around the patient’s actual clinical needs rather than simply choosing the cheapest or fastest way home.

Travel Insurance and Lung Conditions

Tell your travel insurer about your respiratory condition and any relevant treatment or changes in health. Policy terms vary, and failure to declare a pre-existing condition can affect cover.

A UK GHIC or EHIC can be useful for eligible state healthcare in participating countries, but the NHS makes clear that these cards do not replace travel insurance and do not cover medical repatriation back to the UK. Check current NHS GHIC/EHIC guidance.

Flying With a Lung Condition: Quick Checklist

• Ask your GP or respiratory team whether you need pre-flight assessment.
• Do not fly during an unstable flare-up without medical advice.
• Check whether a hypoxic challenge test is appropriate.
• Confirm airline rules for oxygen, POCs, CPAP or other equipment.
• Request airport assistance at least 48 hours in advance where possible.
• Keep essential medication in your hand luggage.
• Allow extra time for batteries, connections and delays if using a POC.
• Declare your lung condition to your travel insurer.
• Remember that GHIC/EHIC does not cover medical repatriation.

Too unwell to travel home normally? Ask SkyCare about medically supported travel or repatriation.

This article was clinically reviewed by Dr Lee Collier on 16/02/2025. It has been editorially updated by SkyCare Repatriation on 19/08/2026 using current British Thoracic Society, UK Civil Aviation Authority, NHS and Asthma + Lung UK guidance. Next clinical review due 16/02/2027 | Originally published on 16/02/2025.