SWISS does not require a certificate for an uncomplicated pregnancy: fly until the end of the 36th week (four weeks before your due date, in SWISS's words) or the end of week 32 with twins. From week 28 it recommends carrying one; a doctor on Mobi Doctor can write it, and you usually see one over video within 15 minutes.
Or plan by dates. Enter your due date and flight dates: the planner works out how pregnant you will be on each flight, whether that flight is allowed, whether a letter is needed for each leg, and the dates a letter must be signed between so it is still valid on the way home.
Copy the flight lines from the airline’s confirmation email (flight number, date, times) and paste them here. It is read in your browser; nothing is sent anywhere.
Enter your flight number and the dates above (or a route), and the planner fills in the airline — the operating carrier on a codeshare — and the flight time from the published schedule.
Or by route: to on the outbound date.
Choose a situation to see whether you need documentation.
You do not have to show SWISS anything if your pregnancy is uncomplicated: you can fly to the end of week 36, or week 32 with twins. Beyond week 28 SWISS recommends a medical certificate confirming the pregnancy is proceeding smoothly and giving your expected delivery date, worth carrying as the simplest proof of how far along you are. Outside those rules, SWISS directs you to its fit-to-fly requirements or a MEDIF upload at med.swiss.com.
It means the certificate is not a condition of boarding, so nobody turns you away for lacking one. If a check-in agent doubts that you are inside the limit, a letter with your expected delivery date settles it; without one, you rely on maternity notes or your word. So read "recommended" as "carry one anyway" from week 28. SWISS's sister airlines take the same line: Lufthansa recommends a certificate beyond week 28 and offers its own form, and Eurowings recommends one from week 28 with no twins rule.
SWISS gives both descriptions of one limit, and they are not identical. "The end of the 36th week" is normally read as 36 weeks + 6 days, the last day before you turn 37 weeks. "Four weeks before the expected delivery date" is 36 weeks + 0 days if the due date sits at 40 weeks. The gap is six days and SWISS does not say which prevails, so treat 36 weeks + 0 days as your last flying day. For twins, "the end of the 32nd week" is 32 weeks + 6 days at the latest; the cautious plan lands you by 32 weeks + 0 days. The limit applies on the date of each flight, return included.
SWISS asks for three things: confirmation that the pregnancy is proceeding smoothly, a statement that it does not prevent you from flying, and the expected delivery date. There is no SWISS form and no maximum age for the letter, but a certificate dated close to departure carries more weight than an old one. SWISS advises discussing any flight plans with your gynaecologist, and accepts a certificate from any licensed doctor. With a multiple pregnancy, ask the doctor to say so, because the week-32 limit depends on it.
SWISS belongs to the four-airline "recommended only" group in our airline pregnancy rules comparison, with Lufthansa, Austrian and Eurowings. The table uses the convention that "week 36" means to the end of that week; the section above explains why you should nonetheless aim to fly by four weeks before your due date. A row with no published figure means SWISS is silent on that point, not that a lenient default applies, so ask SWISS directly rather than assume an answer.
| Letter or certificate required from | Not required; recommended beyond week 28 |
| Last week you can fly, single | Week 36 (36 weeks + 6 days), stated as four weeks before the due date; plan for 36 weeks + 0 days |
| Last week, twins or more | Week 32 (to 32 weeks + 6 days), with no complications |
| Letter must be issued within | Not published |
| Own form | None for pregnancy; MEDIF via med.swiss.com outside the rules |
| Who can sign | A doctor; SWISS refers to your gynaecologist |
| Source checked | swiss.com, 24 September 2026 |
SWISS's limits are written for a pregnancy that has progressed smoothly. If yours has not — bleeding, high blood pressure, a threatened early labour — SWISS steers you to its fit-to-fly requirements or a MEDIF uploaded at med.swiss.com. A doctor on Mobi Doctor can advise on whether you are fit to travel, but the MEDIF decision rests with SWISS. SWISS also flags the raised thrombosis risk and advises drinking plenty of fluids and wearing compression stockings during the flight; the NHS adds that on flights over 4 hours you should move about every 30 minutes.
Choose a time on Mobi Doctor: an EU-licensed doctor is usually with you over video within 15 minutes, daily 7am–11pm CET, anywhere in the EU. The doctor takes your history and, where clinically appropriate, writes a pregnancy fit-to-fly letter with the three statements SWISS asks for, signed and sent to your email after the consultation. A video consultation is €54 + €10 for the certificate — a full consultation, so a prescription where appropriate can be dealt with in the same call. Note that Austrian stops at the start of week 36, six days before SWISS's "end of the 36th week".
No, not for an uncomplicated pregnancy. SWISS recommends one beyond week 28, confirming the pregnancy is proceeding smoothly, that it does not prevent flying, and your expected delivery date, so carry one from then.
Until the end of the 36th week with one baby, which SWISS also describes as four weeks before the expected delivery date, and until the end of the 32nd week with twins or more, if there are no complications.
At 36 weeks + 0 days, yes — that is exactly four weeks before a 40-week due date. Later in week 36 you are inside the gap between SWISS's two descriptions; do not count on it.
No. SWISS allows an uncomplicated multiple pregnancy to fly until the end of the 32nd week, so 33 weeks + 0 days is past the limit however the phrase is read.
SWISS publishes no maximum age. Because the letter's job is to show your stage of pregnancy on the day you fly, have it dated close to departure and covering both flights.
SWISS applies the limit to each flight, so a return after the end of week 36 (or four weeks before your due date) will be refused. Rebook earlier and check your insurer covers the change.
General information, not medical advice — always confirm with your airline before you travel.
