When should I apply for the Thailand Digital Arrival Card (TDAC) before my arrival?

May be a silly question

But if you are doing a Border Bounce or flying out to extend your time or get another 90 days on a multi entry Visa

If you fill out your TDAC 3 days before you travel , Immigration will have advance knowledge of your intentions and time to look at your previous stay periods in Thailand before you leave which the Officer who stamps you out will have immediate access to so may refuse re entry upon your return

WILL TH airport officers assist passengers due to system errors,etc. coz this is a new online system, T U

Watch TNT news explain 100% TDAC fill in 3 days before you leave go on web site read it

I've asked the same thing.

It’s WITHIN 3 days of arrival so you could fill it in on the 2 nd before you leave the UK

Hello: Effective May 1 2025 everyone arriving will be given a n arrival card prior to landing in Thailand and it will ask several questions about your stay! Mel

I haven't looked at it yet. I've not got an address for my first night.

We're same and going to fill it in on 1st May

TDAC is not a visa it’s Thailand Digital Arrival Card , you can complete up to 72 hours before travel , you should get an acknowledgement email to show to immigration and in theory it’s supposed to speed up your progress through immigration.

3 days before

It’s an arrival card and up to three days prior to arrival gives you 0-72 hours before you ARRIVE in Thailand.

The website only lets you select an arrival date within 3 days. All other dates are not an option to select. Do the math as to when you can apply then.