What should I do if I've lost my immigration departure card in Thailand before flying out?

If you've lost your immigration departure card in Thailand, don't worry; you can fill out a new one. You can obtain a replacement at your airline's check-in counter when you're flying out. It's advisable to ask for it while checking in to avoid delays, as immigration doesn't handle these cards at the airport. A tip for future visits is to ask your hotel to staple the card into your passport to prevent losing it.