Flying in Pregnancy: Complete Guide
For most people with a straightforward pregnancy, flying is safe right up until the final weeks. The main things to plan around are airline cut-off dates, blood clot risk on longer flights, and having the right paperwork and insurance in place before you travel.
When is it safe to fly?
There's no medical rule that bans flying at any specific point in pregnancy, but airlines set their own limits, and most follow a similar pattern:
- Up to 28 weeks: usually no restrictions and no letter needed for a straightforward pregnancy.
- 28–36 weeks: many airlines ask for a letter from your midwife or GP confirming your due date and that you're not at higher risk of complications.
- After 36 weeks (32 weeks for twins or a multiple pregnancy): most UK and short-haul airlines won't let you fly at all, since the risk of going into labour mid-flight rises.
Always check the specific airline's policy before booking, as cut-offs and letter requirements vary. The second trimester (roughly weeks 14–27) tends to be the most comfortable time to travel — morning sickness has usually settled and the bump isn't yet large enough to make sitting for hours uncomfortable.
Reducing blood clot risk in the air
Pregnancy itself increases the risk of blood clots (deep vein thrombosis), and long periods of sitting still on a flight adds to that. Simple steps make a real difference:
- Get up and walk the aisle every hour or so where possible.
- Do ankle circles and calf raises while seated.
- Wear graduated compression socks, particularly on flights over four hours.
- Stay well hydrated and go easy on caffeine, which can be dehydrating.
- Choose an aisle seat so you can move around without disturbing anyone.
- Wear your seatbelt low, under the bump, across your hips.
If you have additional risk factors for clots — such as a previous DVT, obesity, or a multiple pregnancy — mention any travel plans to your midwife, as they may recommend additional precautions.
Practical checks before you fly
- Travel insurance: make sure your policy explicitly covers pregnancy-related care abroad, including premature birth, as standard policies often exclude this.
- Vaccinations and destination advice: some travel vaccines and malaria medications aren't suitable in pregnancy, so check with a travel clinic or your GP well ahead of time if you're going somewhere that needs them.
- Airline letter: if you're past 28 weeks, get a letter from your midwife or GP stating your due date, that the pregnancy is progressing normally, and that you're fit to fly — do this a week or two before departure in case appointments are needed.
Frequently Asked Questions
Until when can I fly when pregnant?
Most airlines allow flying up to somewhere between 28 and 36 weeks, with many requiring a doctor's or midwife's letter from 28 weeks onwards. After 36 weeks (or 32 weeks for a multiple pregnancy), most airlines won't allow you to fly at all. Always confirm your specific airline's cut-off before booking, as policies differ between carriers.
Can I fly long-haul when pregnant?
Long-haul flights are generally fine earlier in pregnancy, but the extended sitting time raises the risk of blood clots, so extra precautions like compression socks, regular walking, and good hydration matter more. Many people choose to avoid very long-haul travel in the third trimester simply for comfort, even where airlines would still allow it. If you have any pregnancy complications, discuss long-haul plans with your midwife first.
Do I need a doctor's letter to fly while pregnant?
It depends on your stage of pregnancy and the airline. Under 28 weeks, most airlines don't ask for one, but from 28 weeks many require written confirmation of your due date and that you're not considered high risk. Contact your airline directly to check their exact requirement before you travel.
This article is for informational purposes only and does not constitute medical advice.
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