In April 2017, the prime minister announced the UDAN scheme . For flights less than 500 Km or one hour, 50 per cent of seats on every flight will cost Rs 2500 per seat under the UDAN scheme
However in reality the airline ticket prices have increased after the scheme was announced. Goa Mumbai flying distance is around 500 km , yet now the ticket is more than Rs 4000 for most of the flights from Goa to Mumbai in July 2017 when in July 2016, the prices were less than Rs 3000 for a flight to Mumbai.
It is better to consider alternate modes of transport, especially if the person is not very busy.