Here is the formula that we use when figuring out whether it is cheaper to fly or drive to Florida. We live one hour from the Detroit border for reference purposes.
Drive to Florida (4 days on the road)
motels for 2 nights @ $75./night 150.00
Food for four $75/day 300.00
Gas 200.00
total cost to drive $650.00
Fly to Florida
car rental 175.00
Gas 60.00
Food for travel days 100.00
Parking at airport for our car $7.00/day 50.00
say for a 7 day trip
Total cost to fly $385.00
Plus the cost of the airplane tickets ??????? = total cost to fly.
All prices are quoted in USDollars, since we usually fly out of Detroit.
Sometimes we drive, sometimes we fly, depends on how much time we have available to be away.
You have to decide which way is best or least expensive for yourself
edited to change from 3 nights of motel rooms to 2 nights