"The Syrian government has completed the delivery of the 13th consignment of chemicals," the Organisation for the Prohibition of Chemical Weapons (OPCW) said.
"The deliveries have raised the overall portion of chemicals removed from Syria to 65.1 percent, including 57.4 percent of priority chemicals," it reported in a statement in The Hague.
Damascus had temporarily halted the transfer of its chemical stockpile, citing security reasons, but resumed the operations earlier this month, AFP reported.
Under the terms of the US-Russia brokered deal reached last year, Syria has until the end of June to destroy its chemical weapons if it wants to ward off the threat of US air strikes.
OPCW chief Ahmed Uzumcu said the latest shipment out of Syria was "necessary and encouraging," but again warned that efforts had to be stepped up if the deadline was to be met.
In a statement, he said "both the frequency and the volumes of deliveries have to increase significantly" if the transfers are to be finished "against the projected time frame".