In general, September is the cheapest month to fly from India to Quito. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around ₹ 115,688. If you don’t want to visit Quito in September, then you should wait until February to fly from India, when ticket prices are also cheap, with an average price of ₹ 120,673.
Finding an alternative and possibly cheaper destination airport near Quito is possible. If you are planning a flight to Quito, consider booking flights to Latacunga Cotapaxi Intl Airport (76 km from Quito city centre) or Tena Jumandy Airport (115 km from Quito city centre).