What Factors Affect the Cost of a Charter Bus? There are such a wide range of options available! Here are some of the variables that affect the cost of a charter bus trip. Okay, we have convinced you that charter bus travel will be easier on your pocketbook than other options, but just how much will it cost? Interestingly, one of the advantages of charter bus travel that makes it an attractive option for travelers, also makes it more difficult to nail down an exact cost.