You can do it on your phone anywhere. You can do it at the airport too, if you can get on the plane, but that slows you down. Better to print it if you can.

Strictly three days before. Same for Singapore and Malaysia too

Hello. I have booked a flight to Bangkok for November. Is it possible to complete the arrival information now or do I have to wait until 3 days before I travel? Thanks

Sorry if that came across as unnecessarily grumpy.   Only an idiot like me chooses to arrive in Bangkok on a day when there is no alcohol being sold. It's made worse by me making sure I had enough spare time to go out for a sneaky beer before seeing the in-laws.

It looks like it could be a good place for a quick break when moving between the LB bars with that location. The old Art Box was a fun place. I was surprised when they tore it down due to it's popularity but that's typical for Bangkok really when the developers want to build another hotel or block of condos. Hopefully this market can last longer.