The move will become effective on January 14th, with El Prat being touted as the "best alternative" for flight passengers wanting to visit the popular Catalonian city.
Referring to the new schedule, a Wizz Air press release said: "Polish and Bulgarian travellers will be offered an easy and direct access to the capital of Catalonia."
Passengers who have already booked tickets for the Katowice-Barcelona Girona and Sofia-Barcelona Girona flights will be informed about the schedule change on an individual basis.
The Ukrainian-based low fares airline announced last month that it would launch a new service between Kiev and Oslo Torp – the first route between Ukraine and Norway.
The new service will be introduced on January 5th and comes after the airline announced further new routes from the Ukrainian capital to Dortmund, Cologne and Katowice.