I'm looking take my mother to visit my sister in Brisbane just after the New Year flying business class, so I put in the dates in Google Flights and select the flights I want.

But when I click on where I can get these prices i.e. Expedia, eDreams or direct with the airline they are not the same as Google Flights quoted, they start around £2000 above the quoted price.

Am I doing something wrong or is there always price difference?