Patient guide
Flying with cancer: what to check before a long trip
Many people with cancer can fly safely. A long flight still needs planning, and the right answer depends on your health, your treatment and the timing.
Ask your own doctor first
The most important step is to talk to your oncologist or family doctor before you book. NHS advice says flying may be unwise if you are always short of breath, are anaemic, have recently had surgery, or have certain other problems. Cancer Research UK adds that most people with cancer can travel, but some need to wait or make special arrangements.
Ask whether you are fit to fly, how soon after your last treatment, and what to do if something goes wrong in the air or on arrival.
Points to raise with your doctor
- Recent surgery or a procedure, and how soon is safe to fly
- Low blood counts, anaemia or infection risk from chemotherapy
- Fluid or air around the lungs, or lung problems that reduce oxygen
- Tumours or treatments that raise the chance of bleeding
- Pain control and any new symptoms
- Whether you need a fitness-to-fly letter or airline medical form
Timing after surgery or a procedure
Flying soon after surgery raises the chance of blood clots. The US CDC suggests waiting 10 to 14 days after major surgery, and longer for chest surgery. After a stem cell or bone marrow transplant, Cancer Research UK says doctors may advise against going abroad for 6 to 12 months.
These are general figures. Your doctor may advise a different time for your situation. Treatment in China will often be followed by a return flight, so we ask about timing before you book.
Blood clots (DVT)
Cancer, surgery and long flights each raise the risk of deep vein thrombosis, a clot in the leg that can travel to the lungs. The risk rises on journeys longer than about four hours.
Ask whether you need blood-thinning medicine or compression stockings. Walk the aisle when you can, flex your ankles often, drink water and avoid heavy alcohol. Seek urgent care for a swollen, painful leg or sudden breathlessness.
Oxygen and airline approval
Cabins are pressurized to a lower oxygen level than the ground. If you have a lung condition, your doctor may need to assess whether you need oxygen in flight.
Airlines set their own rules. For example, Air Canada asks for medical approval for some conditions and 48 to 72 hours' notice for oxygen. Personal oxygen concentrators usually need to be airline-approved, and you must carry enough battery. Contact the airline well before you fly.
Travel insurance
The Government of Canada warns that most travel insurance excludes planned procedures in other countries, and provincial plans may cover little abroad. Ask your insurer in writing what is covered, including a pre-existing condition, complications and medical evacuation. Do not assume a policy covers planned treatment.
What to carry
- A doctor's letter with your diagnosis, treatment, medicines and any devices
- A medicine list with generic names and doses, and medicines in original packaging in your carry-on
- Copies of key records, and imaging on a disc or a secure link
- Contact details for your Canadian care team
- Insurance policy number and the insurer's emergency line
Long-haul tips
- Choose an aisle seat and ask about airport assistance
- Plan a rest day on arrival to recover from jet lag
- Wear a mask if your blood counts are low or you are at higher infection risk, if your doctor advises it
- Keep medicines on your home time zone schedule until your doctor tells you how to change it
- Ask your coordinator to meet you at the airport
This guide is general information and not medical advice. Your own doctor decides whether you are fit to fly.
Related pages
Sources: NHS Wales, Travelling with health conditions · Cancer Research UK, How cancer might affect your travel · CDC, Medical tourism · Government of Canada, Travelling outside Canada to receive medical care
Last reviewed: 12 November 2026. This page is general information, not medical advice.
Sino Health Link is an independent coordination service, not a hospital. We do not diagnose, prescribe or treat. Licensed doctors make all medical recommendations and decisions with you.