The cost to refuel a private jet varies wildly based on the size of the aircraft and current fuel prices, but for a mid-to-large jet, it is a staggering expense. A typical Light Jet (like a Phenom 300) holds about 800 gallons, costing roughly $4,000 to $5,000 to fill. A Mid-Size Jet (like a Citation Latitude) holds around 1,500 gallons, costing $8,000 to $10,000. For "Ultra-Long Range" jets like the Gulfstream G650, which has a fuel capacity of nearly 7,000 gallons, a full tank can cost between $35,000 and $45,000 depending on the airport's "Fuel Flowage" fees. These prices are based on an average Jet-A fuel cost of $5.50 to $7.00 per gallon in 2026. It is also important to note that many private jet owners do not "fill the tank" every time; they only take the fuel needed for the specific mission plus safety reserves to save weight and improve performance. Additionally, refueling at "Fixed Base Operators" (FBOs) at major hubs like Teterboro or Van Nuys is often more expensive than at smaller regional airports due to higher infrastructure and service fees.