Flying with Cancer: Everything You Need to Know
For most cancer patients, flying is entirely safe — but there are specific risks and precautions that are more relevant for people with cancer than for the general travelling public. This guide covers the key considerations for flying with a cancer diagnosis.
Can You Fly With Cancer?
In most cases, yes. Flying is safe for the majority of cancer patients, including those in treatment. However, some situations require medical clearance or additional precautions:
- Active lung cancer or significant respiratory compromise: A "fit-to-fly" assessment may be needed (see lung cancer section below)
- Very recent major surgery (within 4 weeks): Check with your surgical team before flying
- Severe neutropenia (very low white blood cell count): May be contraindicated during chemotherapy nadir
- Severe anaemia: Discuss with your oncologist
- Brain metastases with raised intracranial pressure: Seek medical clearance
If in doubt, ask your oncologist or GP directly: "Is it safe for me to fly to [destination] for [duration]?"
DVT: The Most Important Risk for Cancer Travellers
Deep vein thrombosis (DVT) — blood clots forming in deep veins, usually in the legs — is significantly more common in cancer patients than in the general population.
The cancer-clotting link: Cancer increases DVT risk 4–7 times compared with people without cancer. This is due to cancer cells releasing substances that promote clotting, as well as the effects of chemotherapy, surgery, immobility during illness, and certain medications (tamoxifen, hormone therapy for prostate cancer, bevacizumab).
The flight-DVT link: Long-haul flights (6+ hours) increase DVT risk due to prolonged immobility, dehydration, and reduced blood flow in the legs.
Combining both risks: A cancer patient on a long-haul flight has significantly elevated DVT risk. This is the most important safety consideration for flying with cancer.
DVT Prevention on Flights
Compression stockings: Grade 2 compression stockings (30–40 mmHg) are recommended for high-risk travellers. Buy from a pharmacy or medical supplier and ensure they are fitted correctly — too tight causes problems.
Movement: Get up and walk every 1–2 hours. If you cannot get up (window seat, sleeping passengers), do in-seat exercises: flex and extend your ankles 20 times every 30 minutes, press your feet against the floor, and stretch your calves.
Hydration: Drink water regularly throughout the flight. Avoid excessive alcohol and caffeine (both dehydrating).
Medication: Discuss with your GP or oncologist whether prophylactic low-molecular-weight heparin (e.g. enoxaparin/Clexane) is appropriate for your risk level. For very high-risk travellers, an injection 2–4 hours before a long flight can significantly reduce DVT risk.
Seating: Aisle seats allow easier movement. Request an aisle seat when booking — most airlines will accommodate this without charge for medical reasons.
Cabin Pressure and Altitude Effects
Aircraft cabins are pressurised to an equivalent altitude of approximately 6,000–8,000 feet (1,800–2,400 metres) above sea level. This means:
- The partial pressure of oxygen is lower than at sea level
- Gases in body cavities (bowel, sinuses, ears) expand by approximately 25–30%
For lung cancer patients or anyone with reduced respiratory function: Lower cabin oxygen levels can reduce blood oxygen saturation. Discuss with your respiratory physician whether a Hypoxia Altitude Simulation Test (HAST) is appropriate.
For patients with abdominal stomas or recent abdominal surgery: Bowel gas expansion can cause discomfort. Avoid gas-producing foods (legumes, carbonated drinks, brassicas) in the 24 hours before flying.
Radiation at Airport Security
Airport security uses two types of screening: - Millimetre-wave body scanners (the upright pod scanners): Use non-ionising radio waves — not X-rays. Safe for all medical devices and all cancer patients. - X-ray baggage scanners: For luggage only — your medications and medical supplies pass through these. The radiation dose to medication is negligible. - Walk-through metal detectors: For patients with metallic medical devices (ports, implants, brachytherapy seeds) — carry a medical documentation card.
Will airport security cause problems? Metal detectors may alarm for: - Chest ports or PICC lines - Joint replacements or surgical hardware - Brachytherapy seeds (prostate, cervical) - Tissue expanders after breast reconstruction
Carry a medical alert card for any implanted device and request a private screening if preferred.
Requesting Airline Assistance
Airlines offer a range of assistance services for passengers with medical needs. These are generally available at no extra charge but must be requested in advance (typically 48–72 hours before departure):
- Wheelchair assistance at airports
- Aisle wheelchair to your seat on board
- Special meals (low-residue, soft diet, etc.)
- Oxygen for in-flight use (requires medical form and advance arrangement with airline — not all airlines provide this)
- Bulkhead or front-row seating (extra legroom — useful for DVT prevention)
- Priority boarding
- Assistance at connecting airports
Contact the airline directly or through your travel agent. Providing a brief medical summary (one paragraph from your GP or oncologist) helps airlines accommodate your needs.
Never put cancer medications or medical devices in checked luggage:
- All prescription medications (enough for trip + 1 week extra)
- Doctor's letter listing all medications and conditions
- Medical documentation for implants, ports, or radioactive seed implants
- Emergency contact numbers for your oncologist's team
- Copy of your travel insurance certificate
- Any specialised medical equipment (glucose monitor, etc.)
Key Checklist Before Flying
- [ ] Medical clearance obtained if required (lung cancer, severe neutropenia, recent surgery)
- [ ] DVT prevention plan discussed with GP/oncologist
- [ ] Compression stockings purchased and fitted
- [ ] Aisle seat requested
- [ ] Airline medical assistance requested if needed
- [ ] All medications in carry-on with prescription labels
- [ ] Doctor's letter in carry-on
- [ ] Travel insurance confirmed and certificate accessible
- [ ] Emergency contact numbers saved offline on phone
