The airport of Amleria is only at 30' minutes driving.

From Belgium  (Zaventem and Charleroi) Ryanair proposes some cheap flights sometimes.

Take also  a look at  Jetair and Thomas Cook

http://www.aena.es/csee/Satellite/Aeropuerto-Almeria/en/Page/1056530002500/

Other airports :

MURCIA +/-  250 Km

MALAGA +/- 250 Km

With a rental car you must count 2,5 hours tot get to Tabernas.