The average cost to transfer from Barcelona Airport to the city center is around 25.00-30.00€. Please note there is a 4.50€ surcharge for trips to and from the Airport. Minimum fare from Airport is 21€. There are four types of taxi fares in Barcelona Airport: Fare 1. Weekdays from 08:00am to 08:00pm for trips in Barcelona Metro (AMB).
There is a special fare for the airport of 4.50€ (it's a single ticket that does not include changes to other means of transport but you can change to other metro lines). The T-10 cannot be used for the airport. The train is a good option, take it to Passeig de Gracia and there change to the L3 metro. You can *and should) use a T-10 for this
OVZL.