separate cost; additional fee
Refers to an expense that is not included in the base price and must be paid separately. Common in business, travel, and service contexts.
This price does not include separate costs.
Transportation expenses will be billed as a separate fee.
別料金 is more casual and often used for optional extras, while 別途費用 is a formal term for necessary additional costs.
追加料金 implies an extra charge added to an existing bill, whereas 別途費用 emphasizes that the cost is handled separately from the main fee.
Compound of 別途 (separate, another route) and 費用 (expense, cost).