There are various airlines that offer domestic flights from Mumbai to Goa everyday.
These flights cost roughly Rs. 3000 to Rs. 4000 per person (variable amount)
All these Mumbai-Goa flights take off from the Santacruz airport at Mumbai, and these planes land at the Dabolim airport at Goa.
About Dabolim Airport at Goa:
The Dabolim airport of Goa is a domestic airport that is located in the village of Dabolim, near the city of Vasco da Gama and is just 29 kms from Panaji (called Panjim) which is the capital city of Goa. The airport was built in the 1950's during the Portuguese rule of Goa, and it is spread over a sprawling 1840 acres of land.
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