What happens if your passport has less than 6 months left

Two things can happen: the airline catches it at check-in, or immigration catches it on arrival. Both are bad. The airline-catch is more common because carriers are fined per passenger they let board incorrectly.

At the airline check-in desk

The agent runs your passport through Timatic — the airline database of country entry rules. If you don't meet the destination's rule, the system flags red and you don't get a boarding pass. You can ask for a supervisor but they'll back the agent. You won't be refunded — your ticket is "used" once you no-show.

At immigration on arrival

Rarer, because the airline usually catches it first. But if you slip through, the immigration officer will refuse entry, hold you in a transit area, and put you on the next flight home — at your own cost. Some countries (UAE, Singapore, Thailand) do this routinely.

Where it's strict

• Thailand — denied boarding is near-certain.
• Indonesia / Bali — Bali immigration turns travellers back every week.
• UAE — Emirates and Etihad block at check-in.
• Singapore — strictly enforced.
• Brazil — enforced on arrival.

Where it's softer (but still risky)

• Mexico — official rule is duration of stay, but US carriers often apply 6 months themselves.
• Japan — duration of stay officially, but check your airline's policy.
• EU — 3 months, not 6, plus the 10-year rule.

If your flight is in the next few days

UK fast-track passport renewal can deliver in 1 working week (£193.50 in 2026) or same-day in emergencies (£231). Don't bet on it — book a backup plan if you can't move your trip.