The more used and recommendable option to arrive from Girona airport to Barcelona is to use a bus service of Sagales company.

Bus services from Grirona airport to Barcelona:
Bus line: Barcelona Bus (company Sagales)
Travel / trip :
• Girona airport - Barcelona (Barcelona Nord bus station)
• Barcelona (Barcelona Nord bus station) - Girona airport

Ticket price:
• One way: 12€
• Return: 21€

Travel duration: 1hour 10 minutes

I s not necessary to reserve bus tickets previously, the buses schedules are adapted to the departures and arrivals of the airline companies that operate in Girona airport.
The bus-stop is outside the airport, near departure terminal.

Schedules:
In the following links you can view the schedules of arrivlas and departures from Girona airport and from Barcelona.

Girona airport tourism and information office:
Phone: 0034 972186708