Virgin America and Virgin Australia have a great fare (that isn’t likely to last any longer) from Dallas (DAL) to Melbourne, Australia (MEL) or Sydney, Australia for just $208 Round Trip in Economy.
The fare comes up for most weeks from December to May 2018. The flights are connecting in Los Angeles, some are on Delta.
The fare books into Q and should earn 100% Delta Elite Qualifying miles.
The fares showed up right away on Google Flights for me but there is no booking link. Instead I used the dates manually – this sample worked for me for $284 Round Trip.