Spanish low-cost carrier Vueling is raising capacity from Cardiff airport this summer by 41%.
The airline has put more than 151,000 seats on sale for flights between April and October, an increase of 44,000 over last year.
Bookings have also opened early for the airline’s winter 2016-17 flights from the Welsh airport.
Vueling will run up to four flights a week in summer on four Spanish routes.
Services will run to Alicante, Barcelona, Malaga and Palma with fares starting at €39.99 one way.
Cardiff airport commercial director, Spencer Birns, said: “Vueling’s decision to increase flights from Cardiff this summer comes as a direct response to the increased demand from passengers to fly to popular Spanish destinations from Wales’ national airport, a fact which has also been reflected over the past nine months of consecutive passenger growth.
“The airline has been flying passengers to and from Cardiff since 2012 and in that time we’ve seen the routes go from strength to strength.
“We look forward to a continued successful relationship with the airline which will, in turn, lead to more choice for both Welsh passengers and visitors to Wales.”