Direct flights, maybe. But definitely not nonstop.
For reasons which are also mentioned in the website you put down, Bhutanese carriers won't be able to operate an A319-100 with full fuel out of Paro for SIN.
A triangle routing like Paro - Bagdogra - Singapore - Paro might be viable though.
Drukair Royal Bhutan Airlines has re-scheduled its first flight to Singapore
Drukair Royal Bhutan Airlines has re-scheduled its first inaugural flight to Singapore from Paro. The inaugural flight from Paro to Singapore will be on 1 September 2012, instead of 16 May 2012, according to the update from Druk Asia Pte Ltd, the official Representative of Drukair in Singapore.
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