You booked the flight. You packed the bag. You arrive at the airport — and the agent says your passport expires in 3 months. Denied boarding. That’s a $1,200 mistake you won’t make twice. Here’s the hard truth: most travelers mess up document prep because they assume “it’s fine.” It’s not fine. Countries have specific rules, and they change. This guide covers what you actually need to check, order, and carry for international travel in 2026. Passport Validity: The Rule Most People Get Wrong Your passport needs to be valid for at least 6 months beyond your return date for…