How far along can you fly when pregnant?

Most full-service airlines permit travel up to 36 weeks for a single pregnancy. Budget carriers are stricter — Ryanair and easyJet require a doctor's letter after 28 weeks and do not allow travel after 36 weeks. For multiple pregnancies (twins, triplets), the cutoff is typically 32 weeks across most carriers. Always check your specific airline's policy before booking, as it is a condition of carriage, not just a recommendation.

Do I need a doctor's letter to fly while pregnant?

Most airlines require a medical certificate or letter from a doctor or midwife for travel after 28 weeks. The letter should confirm the expected due date, that you are fit to fly, and that there are no known complications. Some airlines have their own form you must complete rather than accepting a standard GP letter — check your carrier's website for the specific requirement. At 28 weeks or earlier, a letter is not typically required but is sensible to carry.

Are airport body scanners safe during pregnancy?

Yes. The millimetre-wave scanners used in most airports emit non-ionising radio waves at very low power levels. WHO, FAA, and NHS guidance all confirm they pose no risk to pregnancy. If you prefer, you can request a manual pat-down instead — this is your right at TSA checkpoints and most international security authorities.

Can I bring expressed breast milk through airport security?

Yes. Expressed breast milk is exempt from the 100 ml liquid rule in the US (TSA), UK, and EU. You may carry any reasonable quantity needed for the journey. In the US you do not need a baby travelling with you — the exemption applies to the milk itself. Breast pumps and associated equipment are also permitted as carry-on. Declare the milk at security separately from other liquids and inform the officer.

What should I do to prevent DVT on a flight when pregnant?

Pregnancy raises DVT risk significantly. Wear compression socks (15–20 mmHg travel grade) from before boarding until after landing. Book an aisle seat and walk the aisle every 45–60 minutes. Do seated calf raises and ankle rotations during the flight. Stay well hydrated and avoid alcohol. On flights over four hours, compression socks are not optional — they are a genuine medical recommendation for pregnant travelers.

Carry-On Guide for Pregnant Travelers

Flying while pregnant is safe for most healthy pregnancies, but requires more planning than a standard trip. What goes in your carry-on, what documentation you carry, and how you manage the flight itself all matter more when you are pregnant.

Airline Cutoff Dates by Carrier

Airline	Permitted up to	Letter required from
British Airways	36 weeks (single) / 32 weeks (multiple)	28 weeks
Ryanair	36 weeks (single) / 32 weeks (multiple)	28 weeks
easyJet	35 weeks (single) / 32 weeks (multiple)	28 weeks
Lufthansa	36 weeks	28 weeks
Delta	36 weeks	No formal requirement, but letter advised
United Airlines	36 weeks	No formal requirement, but letter advised
Emirates	35 weeks	29 weeks
Air France	36 weeks	28 weeks

Always verify directly with your airline — policies change, and the airline's own carriage conditions are legally binding.

What Must Go in Your Carry-On

These items should never go in checked baggage when you are pregnant.

Medical and documentation:

Maternity notes / antenatal record (your full maternity notes, not a summary)
Doctor's or midwife's fit-to-fly letter with due date and gestational age
Travel insurance documentation with the emergency number visible
Any prescription medications

Health items:

Prenatal vitamins and any prescribed supplements
Compression socks (wear a pair, carry a spare for the return)
Small pillow or lumbar support cushion for long flights
Healthy snacks — blood sugar management matters more in pregnancy

Comfort:

A warm layer — aircraft cabins are cold and being cold when heavily pregnant is miserable
Lip balm and moisturiser (cabin air is dry)
Refillable water bottle — hydration reduces DVT risk and swelling

Expressed Milk and Breast Pumps

If you are expressing milk, the rules are clear:

Expressed breast milk is exempt from the 100 ml rule in the US, UK, and EU — carry as much as you reasonably need for the journey
Breast pumps travel as cabin baggage and are not counted against your allowance on most carriers (treat as a medical device)
In the US, TSA does not require a baby to be present for the milk exemption to apply
Ice packs used to keep milk cool are also permitted if partially frozen — fully liquid ice packs follow standard liquid rules

Inform the security officer before scanning. In the US, you can request that milk not go through the X-ray machine and be tested by chemical strip instead.

Preventing Deep Vein Thrombosis

Pregnancy itself raises DVT risk due to changes in blood clotting factors. Flying compounds this. Take it seriously.

Before the flight:

See your GP or midwife if flying over four hours — they may recommend low-molecular-weight heparin (a self-injected anticoagulant) for high-risk pregnancies
Put compression socks on before you leave for the airport, not on the plane

During the flight:

Walk the aisle every 45–60 minutes
Do calf raises and ankle circles while seated
Drink water consistently throughout — avoid caffeine and alcohol
Book an aisle seat at check-in

After the flight:

Keep compression socks on until you reach your destination and have walked around
DVT symptoms (calf pain, swelling, redness) can appear up to 72 hours after a flight — seek medical attention if concerned

Seat Selection

Book an aisle seat. In the later weeks of pregnancy, getting past seated passengers to reach the toilet becomes genuinely difficult, and bladder pressure means you will need to go more often than usual. An aisle seat also makes it easier to stand and move during the flight.

Emergency exit rows are not permitted for pregnant passengers on most carriers. If you booked one before knowing you were pregnant, switch it when you check in.

TSA Body Scanners

The millimetre-wave scanners in use at most US, UK, and EU airports are safe for pregnancy. They use non-ionising radio waves — the same category as a mobile phone signal — at power levels far below any threshold of concern. Both the FAA and WHO have confirmed no risk.

If you prefer to avoid the scanner for any reason, you are entitled to request a manual pat-down. Inform the TSA or security officer before you reach the scanner.