How much do jet engines cost? The engine is a very large share of the overall cost of purchasing the aircraft – and then a large share of the maintenance cost of the aircraft over its lifetime. While the cost for a Cessna piston engine can cost as little as $40,000, the cost of the latest GE9X is around $40 million (the price of jet engines for larger business jets is normally between $1.5 and $3.5 million).