How can I retrieve my TDAC number or update my trip details if I've lost my information?

If you've lost your TDAC information, you can retrieve your TDAC number by checking your email for messages from noreply@tdacservices.immigration.go.th. Alternatively, you can visit the TDAC website at https://tdac.immigration.go.th/arrival-card/?#/home and choose the option to update your arrival card. If those methods do not work, you can easily generate a new TDAC number, which only takes a few minutes.