The order is made up of 15 of the type from one carrier and two additional aircraft from another.
It increases the firm backlog of the 747-8I to 50, plus an additional five ordered by Air China, which are conditional on government approval.
Boeing Commercial Airlines chief executive Jim Albaugh had earlier said during a Paris air show briefing he is “hopeful this week that we will have a couple of announcements” for 747-8 Intercontinental and Freighter orders.
The order for 15 is the largest Boeing has received for the 747-8I since the December 2006 launch order for 20 from Lufthansa.
The first 747-8I, a VIP model, is due for delivery to a completion centre by the end of 2011. The first passenger model will be delivered to Lufthansa in early 2012.