FlyerTalk Forums - View Single Post - Thai Smile - no passport number needed during booking?
Old Sep 1, 2018 | 2:25 pm
  #3  
Thai-Kiwi
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Technically, afaik you need a picture ID available for domestic flights if asked As a foreigner, passport is probably best. Thais have a national ID card.

However, ID for domestic flights rarely asked for.
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