From next Monday September 5, operation of Canberra's airport bus service switches from Deanes to Royale Coach. The timetable stays largely the same, but the price goes up: where the old service was $9 one way or $16.20 return, the new one is $10 one way or $20 return.
I'm not surprised by the price rise, really; whenever I've caught the airport bus service, it has been largely empty. As with many airport bus options, it's most appealing for single travellers -- if there are two or more of you, then a taxi will likely have similar costs. (I'll update our Lifehacker guide to airport bus services on Monday when the new service officially begins operation next week.)