Passport Validity and Travel Authorizations Around the World

Priya Raghunathan · April 16, 2026 · 9 min read

There is a category of travel disaster that happens before you reach the aircraft. The check in agent looks at your passport, does some arithmetic, and tells you that you cannot travel. It is almost always preventable, and it is almost always about validity dates or a missing authorization.

The reason airlines are strict is financial. Under the Chicago Convention framework and national law, a carrier that brings an inadmissible passenger to a country pays a fine and the cost of returning them. Ground staff therefore apply the rules conservatively.

The six month rule, precisely

Many countries require your passport to be valid for at least six months beyond your date of entry, or beyond your intended date of departure. Those are two different rules and the difference matters on a long trip.

Blank pages

• Many countries require one to two entirely blank pages for entry and exit stamps.
• South Africa requires two blank facing pages, and enforces it.
• Amendment or endorsement pages do not count as blank visa pages in most systems.
• Digital entry systems are reducing the requirement, but paper stamping remains normal across much of Africa, Asia and Latin America.
• If you have fewer than four blank pages and a multi country trip planned, renew early.

Electronic travel authorizations

A growing number of countries require visa exempt travelers to obtain an electronic authorization before departure. These are not visas. They are pre travel screening, usually granted in minutes to days, valid for multiple entries over a period of years.

The 90 in 180 day rule

Short stay access to the Schengen Area is limited to 90 days in any rolling 180 day period. It is a rolling window, not a calendar one, which is the part that confuses people. Every day you are inside the area counts, including days of arrival and departure, and time spent in any Schengen country counts toward the same total.

The European Commission publishes a calculator for exactly this purpose, and using it is far safer than mental arithmetic. Overstaying, even by a few days, can result in an entry ban recorded against your passport.

Children and family documents

1. Children need their own passport in essentially every country. Family passports no longer exist in most systems.
2. Several countries, including South Africa, ask for a full birth certificate showing both parents when a child travels.
3. A child travelling with one parent may be asked for a letter of consent from the other. Canada, Mexico and South Africa are the most commonly cited examples.
4. Names must match between the ticket, the passport and any consent letter. A parent with a different surname should carry documentation linking them to the child.
5. Unaccompanied minor services have their own paperwork, booked with the airline in advance.

A document checklist for a long trip

• Passport expiry at least eight months beyond the last day of travel, which clears every common rule.
• At least four blank visa pages.
• All required electronic authorizations obtained and printed, even though they are linked to the passport electronically.
• Visas obtained for every country you will enter, including any where you leave the airport during a connection.
• A photograph of the passport photo page stored offline and in cloud storage.
• Proof of onward travel for any country that requires it, notably several in Southeast Asia and Central America.
• Vaccination certificates where required, particularly yellow fever for certain African and South American routes and for transit through them.
• Travel insurance documentation, which is a legal entry requirement in a handful of countries.