More than 800 men, women and children were picked up from ships abandoned by smugglers in the Bay of Bengal in recent months, after a Thai crackdown on people-smuggling led gang bosses to abandon their human cargo on land and at sea.
It sparked a long verification process between Myanmar and Bangladesh to determine the nationality of the migrants, with neither side showing a willingness to accept them at first.
However, a number of migrants were still undergoing verification.
"The remaining 230 Bangladeshi will be transferred as soon as possible. The Bangladesh side are conducting a rigorous verification process," a government official in Rakhine state told AFP, asking to remain unnamed.
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He said the latest returns were delayed because of devastating floods that have swept across Myanmar in recent weeks.
The migrant crisis that gripped Southeast Asia earlier this year threw a spotlight on the multi-million dollar racket that has emerged to smuggle desperate migrants.
Earlier batches of migrants were returned to Bangladesh in June and July.