Looking to fly out soon - cheaply?

I have now decompressed from my long visit to New York City. Now, I'm already ruminating - where next? My younger sister who lives in the U K has already booked her flight to Sydney for May 8, 2020. We are planning to visit my older son, his wife and my grandchildren. I am still browsing for a decent fare.

This is a good site, I am looking into: