Fit-to-fly Letters and Medical Clearance When Flying with Cancer

August 25, 2026

Planning a flight during or after a cancer diagnosis can come with a few questions you may never have needed to think about before.

You might have been told to check whether you are fit to fly, seen your airline mention medical clearance, or wondered whether you need a letter from your doctor before travelling.

The terminology can sound more complicated than it needs to be. Having cancer does not automatically mean you will need a fit-to-fly letter or medical clearance. What you need will depend on your individual health, treatment, any recent surgery and the requirements of the airline you are travelling with.

Here is what the different terms mean and what may be worth checking before your flight.

What is a ft-to-fly letter?

A fit-to-fly letter, sometimes called a fit-to-fly certificate, is medical confirmation relating to whether you are considered well enough to travel by air.

An airline may ask for medical information if a health condition, recent treatment or surgery could affect you during the flight. If a letter is needed, it will usually come from a doctor or healthcare professional who understands your medical circumstances.

If your condition is stable, you may not need medical clearance at all. However, requirements can vary between airlines, so checking before you travel can help you understand whether there is anything you need to arrange.

However, it is important to note, with some airlines, requesting assistance at the airport or from the airline, could trigger a request for you to supply a fit to fly letter, so always check this at least 2 to 3 weeks in advance of any travel.

Do you need a fit-to-fly letter if you have cancer?

There is no blanket rule that says everyone living with or recovering from cancer needs a fit-to-fly letter.

You may be asked for additional medical information if, for example, you:

• Have recently had surgery.
• Are receiving cancer treatment.
• Have recently experienced complications.
• Have breathlessness or another condition that could be affected by flying.
• Need oxygen or particular medical support during the flight.
• Are travelling with certain medical equipment.

If you are unsure, start by speaking to your healthcare team. They can advise you about flying based on your individual health. Your airline can then explain what medical information or documentation, if any, it requires.

Click here, to read more on ‘Flying with Cancer: What You Need to Know Before You Go.

What is airline medical clearance to fly?

Medical clearance to fly is the process an airline may use when it needs more information about your health before confirming that it can carry you.

It is not necessarily the same as simply having a letter from your doctor.

You may first be asked to provide some information about your condition. For many people, this may be all that is needed. If the airline requires more detail, it may ask you or your healthcare professional to complete additional medical paperwork.

Some airlines use a MEDIF, or Medical Information Form, for this purpose.

The information requested can include your diagnosis, whether your condition is stable, the medication you take, your mobility and any medical support you may need during the journey.

Is a fit-to-fly letter the same as medical clearance?

Not always. Your doctor or medical team can provide information about your health and advise you about whether flying is suitable for you. Your airline will have its own requirements and is responsible for deciding whether it can carry you.

That is why it can be helpful to speak to both your healthcare team and your airline if medical clearance might be needed.

In some cases, a doctor’s letter may be enough. In others, the airline may ask for its own medical form to be completed.

Checking what is required early gives you more time to arrange any paperwork without it becoming another last-minute job before your trip.

What should you ask your healthcare team before flying?

You do not need to understand all the paperwork before speaking to your doctor, consultant or cancer nurse. Simply tell them about the trip you are planning.

It can be useful to share:

• Where you are travelling.
• How long your flight will be.
• When you are hoping to go.
• Where you are in your treatment or recovery.
• Whether your airline has already asked for medical information.

You can also ask whether there is anything else you should consider while travelling, particularly if you have recently had treatment or surgery.

If your airline specifically asks for a fit-to-fly letter or certificate, check what information it needs before requesting one. There may also be a charge for some medical letters or certificates.

Do you need medical clearance after cancer surgery?

You may be asked for medical clearance after surgery, but this will depend on the operation you have had, how your recovery is progressing and your airline’s requirements.

There is no single waiting period after cancer surgery that will be right for everyone.

If you are hoping to fly after an operation, speak to the healthcare team who knows your circumstances. They can advise you about when travelling may be suitable and whether there is anything extra you need to consider.

It is also worth contacting your airline, particularly if your surgery was recent, so you know about any medical information they may require.

Everyone’s recovery is different, so advice should be based on you and the journey you are planning.

What about medical clearance when flying during cancer treatment?

Some people are able to travel while receiving cancer treatment, while others may be advised that a different time would be more suitable.

Chemotherapy, radiotherapy, immunotherapy and other treatments can affect everyone differently. If you are thinking about a trip, talk it through with your medical team so they can help you understand how your treatment and its timing may affect your plans.

If your airline needs medical clearance, checking its requirements early can give you plenty of time to arrange what is needed before you travel.

What medical information should you carry when flying with cancer?

Even if your airline does not require a fit-to-fly certificate, there may be other medical information that is useful to take with you.

Depending on your circumstances, you could ask your healthcare team whether it would be helpful to carry information explaining:

• Your diagnosis and treatment.
• Medication you need to take with you.
• Needles, syringes or other medical supplies in your hand luggage.
• A stoma, prosthesis or other medical device.
• Any additional medical support you may need.

The documents you need will depend on your individual circumstances, medication and destination, so it is worth checking before you travel.

Fit-to-fly checklist: what to check before your flight

A few early checks can make the process feel much simpler.

Before you travel, it may help to:

• Speak to your healthcare team about whether flying is suitable for you.
• Check your airline’s medical clearance requirements.
• Find out whether you need a doctor’s letter, fit-to-fly certificate or airline medical form.
• Allow plenty of time for any paperwork to be completed.
• Check whether you need documentation for medication or medical equipment.
• Arrange airport assistance if it would make your journey easier.
• Check your travel insurance reflects your current medical circumstances.

Once you know what is needed, you can get the practical arrangements in place and focus a little more on the trip itself.

Fit-to-fly letters and cancer travel insurance

Being medically fit to fly and having the right travel insurance for your circumstances are two separate things.

A fit-to-fly letter does not replace travel insurance medical screening or the need to answer questions about your medical conditions when required by your travel insurer. It also does not guarantee that you will be offered travel insurance. Whether or not you will be offered travel insurance is based on completing a full medical screening with the travel insurance provider.

When getting a quote with Lighthouse, you may be asked questions about your cancer diagnosis, treatment, medication and current health. Answering these accurately helps us understand your individual circumstances and assess the cover that may be available to you.

If your health or treatment changes after you have bought your policy, check your policy terms and contact us where required before you travel so that you can understand whether the change affects your cover.

A little more clarity before you travel

Terms such as fit to fly and medical clearance can sound daunting when you first come across them.

In reality, they are there to help establish whether you can travel safely and whether the airline needs to make any arrangements for you.

Start with your own healthcare team. Check what your airline requires. Give yourself enough time to sort out any paperwork.

Then you can spend a little less time thinking about forms and certificates, and a little more time looking forward to where you are going.

At Lighthouse Travel Insurance, we understand that travelling with or after a cancer diagnosis can come with questions you never had to ask before.

Click here, to get a quote.