Passport validity rules for United Kingdom

The UK doesn't apply a six-month rule to visitors — your passport only needs to be valid for the length of your stay. That sounds simple until you factor in the e-gate, which is where most problems start. The gates read the machine-readable zone of your passport and reject anything that expires before your declared exit date, so if you have a return flight the day after expiry the gate will bounce you to a Border Force officer.

A separate trap is the EU 10-year rule on the way back. British passports issued before October 2018 sometimes had extra months carried over from the previous document. Those extra months don't count for Schengen entry, and they don't count for a growing number of non-EU countries either. If your passport shows an issue date more than nine years and nine months ago, treat it as expired for planning purposes even if the printed date says otherwise.

Non-visa nationals arriving in the UK from January 2025 need an ETA before boarding. The ETA is tied to the passport, so renewing your passport after applying means reapplying — budget an extra £10 and a couple of days if a renewal is on the horizon.