Flying When Pregnant: Airline Cut-Offs, Rules and Safety

The short answer. For an uncomplicated pregnancy, flying is safe — RCOG states plainly that occasional air travel is not harmful to you or your baby. The limits are about the chance of going into labour, not danger from the flight. Most airlines carry you to the end of week 36 (single) or week 32 (twins), and most want a letter from week 28.

Airline cut-offs at a glance

The last week each airline will carry you, from their own published policy, checked 24 August 2026.

Airline	Single pregnancy	Multiple	Letter from
easyJet	Week 35	Week 32	None
Ryanair	Week 36	Week 32	Week 28
Jet2	Week 35	Week 33	Week 28
TUI	Week 36	Week 32	Week 29
British Airways	Week 36	Week 32	Week 28
Wizz Air	Week 34	Week 32	Week 28
Virgin Atlantic	Week 36	Week 32	Week 28
Emirates	Week 36	Week 32	Week 29
Qatar Airways	Week 36	Week 32	Week 29
Air India	Week 32	Week 32	Week 32

Check your return date first. The cut-off applies on the day you travel — including the day you fly home. This is the single most common way pregnancy travel plans come apart. Work backwards from your return date, not your outbound one.

Full comparison, including how recently each airline needs the letter dated.

What the clinical guidance says

It is worth separating two things that get muddled: what is medically safe, and what airlines allow. They are not the same, and the airline rules are not primarily medical.

On safety, RCOG is unambiguous: occasional air travel during pregnancy is not harmful for you or your baby as long as the pregnancy is uncomplicated. Its evidence review found no evidence that passenger air travel increases the risk of preterm labour, rupture of membranes or abruption. RCOG also states there is no evidence that changes in air pressure or reduced humidity have a harmful effect.

On timing, RCOG advises that it is safest to fly before 37 weeks with one baby, or before 32 weeks with uncomplicated twins — because from 37 weeks labour could start at any time, and with twins labour commonly comes earlier. That is the logic behind the airline limits too: they are about not having a birth on board or in a foreign hospital, not about the cabin harming the pregnancy.

The risk that is real: clots

Pregnancy itself raises the risk of venous thromboembolism, and sitting still for hours adds to it. RCOG notes there is an increased risk of developing a DVT while flying due to prolonged sitting — while being clear that the increase is small and the absolute risk remains very low.

For flights over four hours, RCOG recommends loose clothing and comfortable shoes, an aisle seat where possible, walking around regularly, in-seat exercises roughly every 30 minutes, drinking water regularly, and graduated elastic compression stockings.

Flight socks: the bit everyone gets wrong. RCOG is specific about the stockings, and this detail is almost universally missed: they are not the same as standard flight socks from a pharmacy or airport shop. RCOG says your midwife or doctor needs to provide the correct size and type. RCOG also advises that low-dose aspirin should not be used to prevent travel-related DVT.

For flights under four hours, RCOG says it is unlikely you will need to take any special measures, though individual assessment applies if you have additional risk factors. Where those risk factors are significant, heparin injections may be advised — that is a conversation with your midwife or obstetrician.

Cosmic radiation

Anyone who flies is exposed to a slight increase in radiation. RCOG’s position is that occasional flights are not considered to present a risk to you or your baby. It becomes a consideration only with frequent long-haul travel during pregnancy, which is really a question for aircrew and very frequent business travellers.

Practical advice that actually helps

Take your maternity notes. If you need care abroad, they are the single most useful thing you can hand over
Check your travel insurance covers pregnancy — and check what it says about neonatal care, which is where costs become enormous if a baby arrives early
Aisle seat, near the front. Easier to get up, closer to the toilets, smoother ride
Drink water steadily. Cabin humidity is very low
Move roughly every half hour, and do calf exercises when seated
Wear the seatbelt low, under the bump and across the hips
Know where the nearest maternity unit is at your destination
Take the letter even if you think you are inside the limit. Gate staff estimate; a letter removes the argument

When to get individual advice before booking

Speak to your midwife or obstetrician before booking if you have had bleeding, a short cervix, a previous premature birth, pre-eclampsia, placenta praevia, a multiple pregnancy, a previous DVT, or any condition needing extra monitoring. Airlines that are relaxed about an uncomplicated pregnancy often require full MEDIF clearance where there are complications — Qatar Airways says so explicitly — and that takes time to arrange.

Common questions

How many weeks pregnant can you fly?

It depends on the airline, and they differ. Most carriers stop at the end of week 36 for a single pregnancy — British Airways, TUI, Ryanair, Virgin Atlantic, Emirates and Qatar Airways all do. easyJet stops at the end of week 35, Jet2 at the end of week 35, Wizz Air at week 34, and Air India at week 32. RCOG’s clinical advice is that it is safest to fly before 37 weeks with one baby, or before 32 weeks with twins.

Is flying safe during pregnancy?

For an uncomplicated pregnancy, yes. RCOG states that occasional air travel during pregnancy is not harmful to you or your baby, and that there is no evidence that passenger air travel increases the risk of preterm labour, rupture of membranes or abruption.

When is the best time to fly during pregnancy?

Most people find the second trimester most comfortable — morning sickness has usually settled and you are not yet close to the airline cut-offs. Clinically there is no point at which flying suddenly becomes dangerous; the limits relate to the likelihood of going into labour.

From what week do I need a fit to fly letter?

Week 28 for Ryanair, Jet2, British Airways, Wizz Air and Virgin Atlantic. Week 29 for TUI, Emirates and Qatar Airways. Week 32 for Air India. easyJet requires no letter at all for an uncomplicated pregnancy.

Does flying increase the risk of miscarriage?

There is no evidence that it does. RCOG’s review found no evidence that passenger air travel increases the risk of pregnancy complications, and states there is no evidence that changes in air pressure or reduced humidity have a harmful effect on you or your baby.

What about the airport security scanner?

Airport security scanners are safe in pregnancy. They do not use ionising radiation of the kind that would pose a risk.

Should I wear flight socks?

For flights over four hours, RCOG recommends graduated elastic compression stockings — but specifically notes these are different from standard flight socks and that your midwife or doctor needs to provide the correct size and type. RCOG also advises that low-dose aspirin should not be used to prevent travel-related DVT.

What if I go into labour abroad?

This is the practical reason behind the cut-offs rather than any danger from the flight itself. Check that your travel insurance covers pregnancy and neonatal care, know where the nearest maternity unit is, and take your maternity notes with you.

Need your pregnancy fit to fly letter?

Tell us your due date, how many weeks you will be on the day you fly and which airline you are travelling with. A GMC-registered UK GP issues the letter in the format that airline requires.

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Reviewed by a GMC-registered GP. Full refund if a certificate cannot be issued on clinical grounds.

Flying when pregnant: rules, cut-offs and certificates