Flying and travel when pregnant in the US: what to check first

There is no federal rule, only carrier policy

No US regulator sets a gestational limit for flying while pregnant. What exists is a convention among carriers and a body of clinical advice, and the two are frequently confused. The CDC's guidance for pregnant travelers puts it accurately: before you book a cruise or air travel, check the airline or cruise operator policies for pregnant women, because some airlines will let you fly until 36 weeks but others may have an earlier cutoff.

So 36 weeks is a common figure, not an entitlement. International routes are often more restrictive than domestic ones, and the carrier that actually operates your flight is the one whose policy applies.

What ACOG says about timing

The American College of Obstetricians and Gynecologists advises that the best time to travel is mid-pregnancy, between 14 and 28 weeks, when energy has returned, morning sickness has improved or gone, and moving around is still easy. After 28 weeks travel may be riskier: it is harder to move around or sit for long periods, and the risk of going into labor is higher.

On flying specifically, ACOG's position is that during a healthy pregnancy occasional air travel is almost always safe, that most airlines allow you to fly inside the United States until about 36 weeks of pregnancy, and that your ob-gyn can provide proof of your due date if needed. Preterm is defined as less than 37 weeks, which is the clinical reason the cut-offs sit where they do.

Getting documentation

Even where an airline does not formally require a letter, carrying dated documentation of your due date is sensible from around 28 weeks. Gate agents make judgement calls about visibly pregnant passengers, and a letter removes the argument. Ask your ob-gyn's office how long it takes to produce and whether there is a fee, and check the airline's rules on how recently the letter must be dated.

Destinations, not just gestation

For American travellers the destination question is often more important than the week count, and the CDC is emphatic about it. Pregnant travellers should avoid some destinations entirely, including those with risk of Zika and malaria.

Zika can cause severe birth defects and is spread by mosquito bites and by sex. The CDC's advice is that if you are pregnant you should not travel to areas with risk of Zika. If travel is unavoidable, use insect repellent and take other steps to avoid bites. If you have a sex partner who lives in or has travelled to an area with Zika risk, use condoms for the rest of the pregnancy.

Malaria in pregnancy is more severe than in non-pregnant adults, and several standard prophylaxis and treatment options are restricted in pregnancy, which narrows the options considerably. Check current CDC destination pages rather than an older guide, because risk maps change.

Cruises are stricter than planes

The CDC notes that cruises may not allow you to travel after 24 to 28 weeks of pregnancy, and that you may need a note from your doctor stating you are fit to travel. That is materially earlier than the airline convention, and it surprises people who book a cruise assuming the same 36-week figure applies. Cruise lines apply the earlier limit because they may be days from a hospital.

Clot risk on long flights

Pregnancy increases the risk of blood clots, and long periods of immobility add to it. On any long flight, move around at regular intervals, walk the aisle when it is safe to do so, flex your ankles and calves while seated, drink water rather than relying on inflight service, and consider graduated compression stockings. If you have additional risk factors, ask your ob-gyn before booking whether you need anything more.

What your insurance will not do

This is the American-specific trap. Domestic US health insurance frequently provides little or no coverage outside the United States, and even in-country a plan with a narrow network may treat an out-of-state hospital as out of network. A preterm birth on a trip can generate a neonatal intensive care bill on the far side of your network agreement.

Before travelling, check whether your plan covers care away from home and at what level, and consider travel medical insurance that explicitly covers pregnancy at your gestation, covers a newborn if delivery happens on the trip, and covers medical evacuation. Read the exclusions rather than the marketing summary; pregnancy exclusions in standard travel policies are common and often start earlier than the airline cut-off.

Security screening and other small frictions

Airport security screening using walk-through metal detectors and millimetre wave scanners is not considered a risk in pregnancy, but you can request a pat-down instead if you would prefer, and you do not have to give a reason. Expressed milk, formula and cooling packs are allowed through US security in quantities greater than the usual liquid limit, though they are screened separately, so allow extra time and declare them at the checkpoint rather than burying them in a bag.

Seatbelts should be worn low across the hips, under the bump, for the whole flight rather than only when the sign is on, since turbulence is unpredictable and abdominal injury is the specific thing you are protecting against.

Practical preparation

Book an aisle seat. Carry your prenatal records or have digital access to them. Know where the nearest hospital with obstetric capability is at your destination, not just the nearest emergency room. Keep prescriptions in labelled original packaging. And if you are travelling in the third trimester at all, choose destinations with hospitals you would be content to deliver in.

What to do, and in what order

Check the operating carrier's policy for your exact route and gestation. Check the CDC destination page for Zika and malaria before booking. Ask your ob-gyn for dated documentation of your due date from 28 weeks. Confirm what your health plan covers away from home and buy travel medical cover that names pregnancy and newborns. Then plan the clot precautions and locate the nearest obstetric hospital at your destination.