A typical cross country flight must equal at least 50 nm one way, so the fuel cost of flying over 100 nm round trip, plus the cost of the aircraft rental must be calculated. Aircraft rentals average $125 per hour and the flight should take 3 hours at 115 mph. For example, a Cessna 172 burns around 8 gallons of fuel per hour and the average gallon of aircraft fuel is around $6, so the cost of the XC flight would be approximately $519. The cost of the aircraft rental and fuel consumption will vary depending upon the aircraft used.