Also bear in mind when looking at FR where you are actually heading too.
BCA (Barcelona) airport to city centre is approx 30 mins, while GRO (Girona) is approx 1 hour 40 mins away - so factor in the additional cost of the whole journey, ie your front door to your hotel.
While FR may look cheap, if you end up paying higher parking fees and transfer costs (not to mention the additional time involved) you may be better looking at alternative airlines.