The return flight would depart at 7.30 pm (local time) from there and land at India's commercial capital at 10.30 pm (local time), the airline said in a statement.
"Effective August 22, 2019, IndiGo will operate non-stop flights from Mumbai to Singapore and Bangkok," it stated.
The daily flight on Mumbai-Bangkok route would depart from Mumbai at 9.30 pm (local time) and would land at 3.35 am (local time) at Thailand's capital.
The return flight would depart from Bangkok at 3.25 pm (local time) and arrive at Mumbai airport at 6.30 pm (local time), the low-cost carrier said.
"Connections between Mumbai and Singapore and Bangkok are highly significant from a trade perspective as it connects key commercial hubs in the region, William Boulter, the chief commercial officer of IndiGo, said.