Admittedly, private charter flights are much more expensive than commercial flights. To estimate the cost of flying privately in the US, use the following formula: (Cost of a first-class commercial ticket x 4) x number of seats in the aircraft. For example, a cheap first-class ticket is about $500. Multiply this by four to get $2,000. A light jet seats six. Multiply $2,000 by six to get $12,000. Always remember that you pay the same for a private jet regardless of how many people are flying.