I’ve used Sky scanner for around 5 years, I’ve booked major flights like LA-Melb. To Lon-Melb with them. It doesn’t get much better than this website when it comes to comparing and booking your flights.

There is a new website from google recently unleashed, aimed to be better then travel agents!

I managed to find a mega cheap return flight o Barcelona via google flights. It is very up to date with flash sales and everything where as sky scanner can be a bit delayed with updating. Google flights seems to be the way of the future, as there is no more powerful search engine in the world then google.

https://www.google.co.uk/flights/

https://www.skyscanner.com.au

 

See also How to get cheap flights