The FTSE 250-listed science and engineering company said the acquisition would accelerate its international growth strategy and establish a test and evaluation and engineering services capability in Germany.
QinetiQ added that its capability integration, threat representation and operational readiness offering would also be strengthened by the acquisition.
Steve Wadey, QinetiQ chief executive, said: "E.I.S Aircraft Operations is a high growth business which provides airborne training at a disruptively low price. This acquisition supports our strategy for international growth by providing access to the European defence market and enhancing our ability to deliver capability integration, threat representation and operational readiness for customers."
E.I.S. Aircraft Operations generated €20.1mln in revenue in the year ended 31 December 2017, with underlying earnings of €5.4mln.