It gives a new dimension to the range following on from the five-door and SC Sports Coupé variants.
Set for release in Ireland at the tail-end of 2013, the car will be available in time for the 141 plate.
The boot has a capacity of 587 litres, rising to 1470 litres with the rear seat backrests folded.
The extensive line-up of hi-tech options, including the full-LED headlamps, is expanded further by ACC proximity radar and DCC variable damper adjustment.
The optional Dynamic Pack, including DCC and Progressive Steering, enables a high degree of control under sporty driving conditions.
"Nobody has to choose anymore between sporty and practical. The new Leon Sports Tourer offers both," said Jürgen Stackmann, President and CEO of SEAT S.A.
"With its sporty look, its surprisingly high utility and its state-of-the-art technology, the Leon Sports Tourer defines a new standard in the compact estate car class – at a very fair price.
"Like the already highly successful Leon and Leon SC, the new Sports Tourer is the perfect representative of SEAT's brand values."