Second Home Affairs Minister Desmond Lee told parliament the discovery of the two brought to nine the number of radicalised foreign domestic workers uncovered by the city- state since 2015. All have been repatriated.
The affluent island-republic's leaders have warned it is a prime target for a terror attack because of its strong stand against terrorism and reputation as a regional financial centre.
The city-state is also supporting the US-led international coalition against IS with non-combat assistance like air-to-air refuelling.
"One of them intended to travel to Syria with her foreign boyfriend to join ISIS," he said yesterday, using another name for IS.
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No details were given for the seven other maids repatriated earlier.
While none of the nine maids intended to carry out attacks in Singapore, "we cannot condone support for any radical ideologies... Whether by locals or foreigners," Lee said.
Hundreds of thousands of foreign maids and construction workers are based in Singapore, one of Asia's wealthiest economies.
The convicted ringleader, Rahman Mizanur, was jailed for five years last year. He had tried several times to join IS in Syria but could not get visas to Turkey or Algeria, court documents showed.
He and a group of other Bangladeshis working in Singapore had planned to violently overthrow the Bangladeshi government and establish a caliphate there, according to the documents. They also collected funds to support their cause.