Reus is a town in Catalonia.
Aeropuerto de Reus- Ryanair flies to London (Luton and Stansted), Liverpool, Dublin, Glasgow (Prestwick) and Hahn.
Here you can view the Time Table page for the bus from Barcelona to Reus Airport, and from Reus Airport to Barcelona city center:
(WARNING: These links are broken. They go to a Girona Airport page.)