Upon arrival in Thailand, foreign citizens must hold a valid passport with at least six months validity, a valid Thai visa, and proof on onward travel. However, visitors from ASEAN or Western countries, including most European, Commonwealth, and North American citizens, are not required to have a Thai visa for visits less than 30 days in Thailand.  They will be granted access through Thailand immigration with a 30 Thai visa waiver, provided upon arrival. After such time, a Thai visa extension from an immigration office or a Thailand visa from an embassy or consulate outside of Thailand is required. Immigration policies are subject to change: check with The Ministry of Foreign Affairs (www.mfa.go.th) for the latest information.