wrote on Dec 10^th, 2015 at 10:10pm:

ye i had trouble with site aswell, i travelled with a mate who took photo of timetable in airport for friends, i,ll try get him to put it up on forum! we payed 21.95E one way bit more expensive than train, local taxi maybe!!!!! for the rest of your journey :) :)

We paid 11 EUR from Tortosa to the barcelona airport! We bought a Hife card for 99 EUR. This is for 10 trips. You pay 1 or 2 eur extra for the special airport-bus that brings you into the airport (the last +/- 3 km). Nothing beats that price.

We took the bus in Tortosa and in Aldea on a small parking we need to catch another bus, that was already waiting for us.
A few km before the airport, we need to catch another bus. Within 2 seconds this bus arrived and brought us to the entrance hall of the airport.

On the way back, we could easily find the bus at the airport. We showed our Hife card and paid about 1 or 2 eur for the "airport-bus". Also here we need to leave the "airport-bus" at some kms from the airport. We needed to wait about 15 minutes before the Hife bus arrived. We now know that this can happen, so don't worry when you need to wait.
Then again a change at the small Aldea parking. The bus was already waiting for us.

The bus arrived in time at the airport and also in time on the way back to Tortosa.
Nothing beats that price! :)