There is no global rule on flying while pregnant. Each airline sets its own gestational limits and paperwork, and the cut-offs do not match.
Most international carriers start asking for a medical certificate around week 28, but hard bans land anywhere from week 34 at Wizz Air to week 36 at British Airways, Emirates, and several others — while Delta Air Lines imposes no formal cutoff and Southwest Airlines lets passengers board at 38 weeks and beyond. Across the industry, the practical window swings by roughly ten weeks.
A traveler at 34 weeks can board a Delta flight with no medical paperwork at all. The same traveler on Wizz Air is already past the cutoff. That gap isn’t a quirk of two edge cases; it’s the product of an industry with no shared pregnancy standard, no harmonizing regulator, and no obligation for one airline to match another.
The real question isn’t “how many weeks pregnant can you fly” in the abstract. It’s which carrier’s name is on the ticket, what it treats as valid proof, and whether that rule changes between a domestic leg and a connection through a Gulf or Asia-Pacific hub. This article works through those variables, because they decide whether a booking is accepted at check-in or quietly refused at the gate.
The ten-week swing hiding in every ticket
No international body sets a common pregnancy flying limit. Carriers write their own conditions of carriage, which is why the same due date produces such different outcomes.
The loose industry norm is a medical certificate starting around week 28, but carriers override that in both directions.
At one extreme, Wizz Air prohibits singleton travel after week 34, according to a policy roundup by MedicalCert.co.uk. At the other, Delta Air Lines publishes no formal cut-off or documentation requirement at any stage — the outlier in a carrier-by-carrier index of pregnancy policies. British Airways sits in between: no single pregnancy after week 36 and no multiples after week 32, according to British Airways.
United Airlines requires a certificate from week 36, supplied in duplicate and dated within 72 hours. Emirates, whose conditions of carriage draw the singleton line at week 36, starts asking for a medical certificate at week 29.
That spread matters because the trigger week sets how early a booking can fall apart. A certificate demand is not a suggestion. At flydubai, a passenger past the 28th week who cannot produce the required certificate at check-in will not be carried.
| Carrier | Singleton cut-off week | Multiple-pregnancy cut-off week | Certificate trigger week | Certificate validity and required content |
|---|---|---|---|---|
| British Airways | End of week 36 | End of week 32 | Not specified | Doctor or midwife letter; single vs multiple, due date, no complications; dated close to travel. |
| Emirates | Not carried after week 36 | Not carried after week 32 | After week 28/29 | Signed doctor/midwife report: pregnancy type, uncomplicated status, due date, latest fit date; dated within 10 days. |
| United Airlines | Week 36 cutoff for certificate | Not specified | From week 36 | Obstetrician’s certificate in duplicate, dated within 72 hours. |
| American Airlines | Around week 36 (within four weeks of due date) | Not specified | Within four weeks of due date | Doctor’s certificate for recent exam and fit-to-fly; international near term: 48-hour exam, coordinator clearance. |
| Delta Air Lines | No formal cut-off | No formal cut-off | No trigger | No medical documentation required at any stage. |
| Southwest Airlines | Permitted at 38 weeks and beyond | Not specified | No trigger | No mandatory certificate; recommends against flying after 38 weeks. |
| Wizz Air | Not carried after week 34 | (Unverified) | Not specified | Single pregnancies banned after week 34; multiple-pregnancy rules unverified. |
| Lufthansa | End of week 36 | End of week 32 | Recommended from week 28 | Singleton no certificate until week 36; gynaecologist certificate recommended after 28; multiples end week 32. |
| Singapore Airlines | Weeks 29–36 | Weeks 29–32 | Certificate required from week 29 | Certificate dated within 10 days; states fitness, weeks pregnant, due date. |
| Qantas (4+ hour flights) | End of week 36 | End of week 32 | Not specified | Shorter flights: singletons to 40 weeks, multiples to 36. |
| flydubai | Completion of week 36 | Completion of week 32 | Completion of week 28 | Certificate in the carrier’s specified languages, signed and stamped; gestational weeks, due date, normal pregnancy, fit dates. |
| Source: British Airways; Emirates; United Airlines; American Airlines; Delta Air Lines; Southwest Airlines; Wizz Air; Lufthansa; Singapore Airlines; Qantas; flydubai | ||||
What counts as a valid certificate
Carriers don’t just disagree on the trigger week. They disagree on what a piece of paper must say, who may sign it, and how fresh it must be. The contrasts are concrete.
United Airlines has the most procedurally specific rule in the set: from week 36, it wants an obstetrician’s certificate supplied in duplicate and dated within 72 hours of departure. That’s tighter than Emirates, which asks for a signed report from a doctor or midwife covering pregnancy type, due date, latest fit-to-travel date, and absence of complications — a document that goes stale after 10 days and must reach the airline at least 48 hours before departure whenever fitness to fly is in doubt. Singapore Airlines adds its own ten-day dating rule for travel from week 29.
American Airlines ignores gestational weeks almost entirely. Its certificate trigger is the calendar due date: once you’re within four weeks of delivery, you need a doctor’s note confirming a recent exam and fit-to-fly clearance.
That makes the rule feel less predictable, because it doesn’t line up with the week-28/36 markers readers see elsewhere.
Then there is Delta. No stage of pregnancy triggers documentation. That’s not a loophole; it’s a formal policy stance, and it makes Delta the clearest example of an airline diverging from standard medical advice.
Guidance for UK GPs published by LMC (Liverpool Medical College), for example, says flights should be wrapped up by week 37 and that a GP letter may be needed from week 28 onward.
Flight deals
most people never see
Our AI monitors 150+ airlines for pricing anomalies that traditional search engines miss. Air Traveler Club members save $650 per trip per person on average: see how it works.
Each deal saves 40–80% vs. regular fares:
The domestic-international split that changes your connection
The same airline can treat a domestic leg and an international leg differently, and that distinction is rarely visible when you book.
American Airlines is the clearest example. For domestic segments inside the four-week window, a doctor’s certificate and a recent exam are the main hurdle. For international or over-water travel near term, the airline requires an examination within 48 hours of departure and clearance from a special coordinator.
A passenger cleared for a short domestic hop may still hit extra procedure on the connecting transatlantic leg.
Qantas splits its limits by sector length, as the table above shows. On a ticket with a trans-Pacific leg and an Australian domestic feeder, the airline can be stricter on the long leg than on the short one — even though both flights carry the same Qantas code.
Not every carrier publishes a distinct domestic policy, and the available facts do not resolve the question for all of them. Delta’s published materials also do not spell out whether its no-restriction stance varies for long-haul international operations. The safe assumption is the opposite of intuitive: do not treat one carrier’s permissive rule as applying to every leg it operates.
When the contract turns a pregnancy into a bill
Emirates is the carrier that puts the sharpest consequence in writing. Under its conditions of carriage, if you fly after week 28 without the certificate, or misstate how far along you are, and then need in-flight medical care or a diversion, the airline can hold you liable for its costs — including treatment, ground transport, hospital admission help, third-party care, and the diversion itself. Emirates also treats a diversion as the end of the arrangement: it owes the passenger no onward carriage, and the sectors she has not yet flown are gone.
Think through the practical version. A passenger who boards late in pregnancy without the right paperwork can end up in an emergency that turns the cabin into a delivery room.
The resulting bill can reach five figures. Few carriers state that consequence this plainly, but Emirates’ contract language is public and unambiguous.
What this means for you
The defensive move is to treat each leg as its own policy zone. Look up the specific carrier on each flight, not just the first one. A Delta-operated domestic leg will not protect you from an Emirates-operated connection with a week-29 certificate trigger.
Ask what the carrier will actually accept: who can sign, what the letter must say, and how fresh it must be. A certificate that satisfies British Airways may fail United’s duplicate-and-72-hours rule, and an American Airlines domestic clearance may not cover the international leg.
Policies move. Before you book or fly, recheck the carrier’s current conditions of carriage, not a travel blog summary or the advice you got from another airline.
Key terms
- Conditions of carriage
- The conditions of carriage are the contract between an airline and its passenger, setting out the terms on which the carrier agrees to fly them. Each airline writes its own, which is why two carriers can treat the same passenger completely differently. They are public documents, so the exact pregnancy clause can be read before booking rather than inferred from a summary.
- Medical certificate
- A medical certificate is a letter from a doctor or midwife confirming that a passenger is medically cleared to travel. Airlines set their own rules on when one is needed, who may sign it, and how recently it must have been written. The content is checked as closely as the date: Singapore Airlines wants the letter to state fitness to travel, the number of weeks pregnant, and the estimated delivery date, while flydubai requires it signed, stamped, and written in one of its specified languages.
- Gestational week
- A gestational week is the unit airlines use to count how far a pregnancy has progressed, and it is the number every pregnancy policy is written around. Because the limits are expressed as weeks rather than dates, a certificate usually has to state the gestational week alongside the estimated delivery date. That is why the same due date can leave one passenger inside a carrier’s limit and another past it, depending on which airline is on the ticket.
- Diversion
- A diversion is an unscheduled landing made before the aircraft reaches its destination, usually because something on board cannot wait. For a pregnant passenger, it is the point at which the airline’s paperwork stops being an administrative detail and becomes a liability question. Emirates is one of the few carriers whose conditions of carriage state the financial consequence outright, which is why the clause is worth reading before a late-pregnancy flight.
Questions? Answers.
Can I fly at 36 weeks pregnant?
It depends on the carrier. Emirates and British Airways will not carry single pregnancies after week 36, Lufthansa allows it until the end of week 36, and Qantas treats 36 weeks as the limit for long flights of four hours or more.
Is it illegal to fly 37 weeks pregnant?
No. The restriction is airline policy, not a legal prohibition. Emirates bans single pregnancies after week 36, and UK GP guidance recommends completing all flights by week 37.
Can a 7 month pregnant travel in a flight?
Generally yes, with paperwork. Most international carriers begin asking for a medical certificate from around 28 weeks, Lufthansa recommends an up-to-date gynaecologist’s certificate after that point, and UK guidance says a GP letter may be needed from 28 to 37 weeks.
Can I still fly at 32 weeks pregnant?
For a singleton pregnancy, usually yes on most carriers. For multiples, the picture changes: British Airways, Lufthansa, and flydubai all draw the line at the end of week 32.
Should I fly at 30 weeks pregnant 5 hours?
Most carriers will still accept a 30-week singleton with the right certificate. Lufthansa allows uncomplicated singletons until week 36, and Qantas permits flights of five hours up to 36 weeks. Ask your doctor for the medical judgment.
What happens if a pregnancy complication forces an emergency diversion?
Emirates’ conditions of carriage state that if a passenger failed to comply with certificate rules or gave incorrect gestational information, she can be billed for the airline’s costs, and once a diversion occurs, the airline’s obligations are fully discharged with no duty to provide onward travel.
