The official, who spoke on condition of anonymity in line with regulations, told The Associated Press that the diplomats include a charge d'affairs.
Kuwait, where tens of thousands of Syrians live, has been a strong supporter of the opposition trying to remove President Bashar Assad from power.
Khaled al-Jarallah, an undersecretary at Kuwait's Foreign Ministry, was quoted in the local Kuwaiti news website Aljarida earlier this month as saying that the Syrian diplomats left Kuwait City voluntarily in March and are returning voluntarily to resume consular services for Syrian residents there.
Al-Jarallah was quoted as saying that this does not mean a normalization of relations with Syria and that Kuwaiti diplomats would not be returning to Damascus, where the embassy closed after Syria's crisis began in March 2011.
The Syrian Embassy in Kuwait shuttered it doors nine months ago, forcing some 130,000 Syrian residents there to seek consular services from the embassy that remains open in the United Arab Emirates.
Syrians across the Persian Gulf Arab states have struggled to renew their passports and register marriages, births and deaths with their government because of the closure of Syrian embassies in Saudi Arabia, Qatar and Kuwait.