De acordo com este site há um ônibus do aeroporto de Reus para Barcelona:
The journey time is one and a half hours, and it costs €12.50 for a single ticket and €22.00 for a return. The bus travels to Barcelona Sants bus station.
Um site similar afirma o seguinte sobre o ônibus do aeroporto de Girona a Barcelona:
Tickets cannot be reserved in advance and cost €15.00 for a single and €25.00 for a return.