(Corrects backlog figures, which were mistakenly reported in original article.)
Lufthansa has firmed up its order with Airbus for 25 A320neos and five A321neos.
The German carrier's board approved the order in March. The aircraft will be powered by Pratt & Whitney PW1100G engines.
Deliveries are scheduled to begin in 2016.
The order brings Lufthansa's backlog with Airbus to 85 A320-family aircraft. Its backlog also includes eight A330s and seven A380s.
Airbus has secured about 1,200 orders and commitments for the neo since its launch in December 2010.