As Skyscanner is an aggregator and not a travel agent, its deals can come from anywhere.
For example, those mentioned above are from Jetstar.
What's handy is that Skyscanner does the work for you. It trawls through all the sites – even ones you've never heard of – to nab you the best price.
Because of this, the deals available on Skyscanner are only as good as the brands it features.
Where you might find better is with brands Skyscanner doesn't work directly with, like Cebu Pacific.
While Skyscanner's search pulls up Cebu Pacific's flights they always lead to other booking sites such as Trip.com or Kiwi.com. In these instances you may find booking direct gives you a better deal.