noun
one-way rental fee; drop-off charge
A surcharge applied when a rental vehicle is returned to a different location from where it was picked up. Common in car rental and bike rental contexts.
レンタカーを別の営業所で返すと、乗り捨て料金がかかります。
If you return the rental car to a different office, a one-way rental fee will be charged.
乗り捨て is the act of abandoning or leaving a vehicle, while 乗り捨て料金 specifically refers to the fee for doing so in a rental context.
Compound of 乗り捨て (のりすて, 'abandoning a vehicle') + 料金 (りょうきん, 'fee'). The term is a straightforward modern compound used in rental service contexts.