FlightScout has great prices to New Delhi, via Singapore on 5* Singapore Airlines.
Airline: Singapore Airlines
From: most major Aussie ports
To: New Delhi, India
Alliance: Star Alliance
Note that the prices are sometimes higher on FS but then lower when you click through to the final skyscanner link. Caching eh. I find FS easier to use to find the dates first though.
Flights from Perth: https://flightscout.co/au/cheap-flights/perth-australia-to-n…
Flights from Sydney: https://flightscout.co/au/cheap-flights/sydney-australia-to-…
Flights from Melbourne: https://flightscout.co/au/cheap-flights/melbourne-australia-…
Flights from Adelaide: https://flightscout.co/au/cheap-flights/melbourne-australia-…
