Two months after the Expert Roundtable Discussion on “The Road to Ratification and Implementation of the ASEAN Charter” was jointly organized by the ASEAN Studies Centre (ASC), Institute of Southeast Asian Studies (ISEAS), Singapore, and the Habibie Center, Indonesia, on 17 July 2008 in Jakarta, three remaining members of ASEAN — Thailand, the Philippines, and Indonesia — finally cleared the way for their ratification of the ASEAN Charter.

Thailand's Parliament approved the ASEAN Charter in three readings on 16 September 2008, making it the eighth member to have done so. The legislation to enable the Thai Government to implement and comply with the ASEAN Charter was endorsed by the Thai Senate. It has been sent to His Majesty the King of Thailand for his royal signature before its proclamation into law.

The Philippine Senate, on 8 October 2008, approved the ratification of the Charter. Sixteen senators voted for the ratification of the ASEAN Charter, with one dissenting vote. The Philippine Senate is the body charged with approving treaties for ratification. The instrument of ratification will now have to be signed by the President of the Republic of Philippines.

On 21 October 2008, Indonesia's House of Representatives (DPR) approved a bill consenting to the ratification of the ASEAN Charter. The bill will be passed on to the House's Consultative Body (Bamus), which will also determine the date of a House plenary session, when the bill will be passed into law.

As stipulated in Article 47, the ASEAN Charter shall be ratified and signed by all ASEAN member states. Instruments of ratification shall be deposited with the Secretary General of ASEAN who shall promptly notify all member states of each deposit. The Charter shall enter into force on the thirtieth day following the date of deposit of the tenth instrument of ratification with the Secretary General of ASEAN.