Aberdeen International Airport (ABZ) is closest to the venue and is served by American Airlines/British Airways, Delta/KLM, Aer Lingus and many others. It is accessible by taxi and bus to the city.
Edinburgh Airport (EDI) is another option to fly into and is accessible by tram, taxi and bus from the city. You can spend a few days in Edinburgh and then take the train up to Aberdeen, it is a 2 hour and 27 minute train.
Glasgow International Airport (GLA) is another option to fly into and is accessible by tram, taxi and bus from the city. It is a 2 hour and 37 minute train to Aberdeen.