Can you fly while pregnant, and what are the airline rules?
Generally yes, and flying is not considered harmful in an uncomplicated pregnancy — but airlines impose their own limits, and those limits exist mainly because they do not want a birth on board rather than because flying is dangerous.
The typical airline position, which varies and must be checked with your specific carrier:
No restriction in early and mid pregnancy for most airlines.
A letter from a doctor or midwife commonly required from around 28 weeks, confirming the due date and that the pregnancy is uncomplicated.
A cut-off around 36 weeks for a single pregnancy on most airlines, and around 32 weeks for a multiple pregnancy.
Shorter limits on some routes, particularly long-haul and where medical facilities en route are limited.
These are airline rules, not medical advice — and they differ between carriers, so a return flight booked with two different airlines can leave you able to fly out and not back, which is a genuinely common problem.
What the medical picture actually is:
Cabin pressure and oxygen levels are not considered a problem in an uncomplicated pregnancy.
Radiation exposure from occasional flights is very small and not regarded as a concern for passengers, though it is managed for frequent flying crew.
Thrombosis risk is elevated in pregnancy, and this is the most substantive concern — compression stockings, movement and hydration matter more than usual, and advice should be sought.
Security scanners are not considered harmful.
The second trimester is generally the most comfortable time to travel.
The practical matters that catch people out:
Travel insurance. Many policies restrict cover beyond a stated week, exclude routine pregnancy care entirely, and may not cover a newborn delivered abroad. Check the specific wording, since this is where the financial exposure is.
Medical facilities at the destination, and whether care would be accessible and affordable.
Vaccination and health requirements, several of which differ in pregnancy.
Seat choice — aisle seats, and avoiding exit rows, where pregnant passengers are not permitted.
General information, not medical advice.