The distance between Switzerland and Cuba is 7.982 km.
If we take a Boeing 747-400 with 416 Passengers we need 120'000 liter Kerosin to fly this distance. One liter Kerosin is 10 kWh. If we divide it by the amount of passenger that are in the plane we you would calculate as followed:
120'000 liter Kerosin = 288.46 liter Kerosin per passenger
416 passenger
288.46 x 10 kWh/liter = 2'884.61 kWh per passenger
So one person consume 2'884.61 kWh to fly one-way from Switzerland to Cuba.