How do you say “I've lost my passport” in Thai?
หนังสือเดินทางหาย
nǎng-sǔe dern-thaang hǎai
I've lost my passport

Say it carefully
หนังสือเดินทาง is the formal word for passport.
When you’ll use it
This phrase is part of 🆘 Emergencies & Health — see all of them in context on the homepage phrasebook.