Can I make multiple entries into Thailand within sixty days while traveling to Vietnam and the Philippines?

Once you enter Thailand you get 60 days to stay with a 30 day extension if needed. Once you leave and come back you get a new stamp for 60 days, you can’t use that same previous stamp. You can also apply for the multi entry online but you have to pay for it and it’s not necessarily worth it because you are going back home and will have proof of that ticket back home. Plus you’re getting a free 60 days each time you enter Thailand so just enter Thailand stay for however long and then go do your traveling and come back but be sure to have your ticket back home because then they will think you are trying to live or work in Thailand

Just transit through Bangkok on the way home

Shouldn't have any issue at all doing "tourist stuff" in S/E Asia using Thailand as a base of travel. It's done all the time.

US passport gets in for 60 days free stamp (visa exempt) each time you enter. Your planned travel sounds normal and wouldn't raise flags stamping into thailand multiple times at all.

Remember you need to file a TDAC (Thailand Digital Arrival Card) each time you enter the country using the online web-portal



Safe travels (y)