Collecting a hire car in one city and leaving it in another usually costs noticeably more. The additional charge covers moving the vehicle back to where it is needed.
Fleets are balanced against local demand
Each branch holds a fleet sized to its own bookings, and a vehicle left elsewhere is missing from that calculation until it returns.
If enough customers move cars in one direction, the origin runs short while the destination accumulates vehicles it cannot rent out.
The fee is the mechanism that either funds the correction or discourages enough of the movement to keep the imbalance manageable.
Repositioning costs are real
Returning a vehicle means either paying a driver, moving it on a transporter, or renting it out cheaply to someone travelling the other way.
All three have costs, and the transporter option only becomes economical when several vehicles need moving along the same corridor.
The charge therefore varies with distance, direction and how frequently the company already moves stock between those two points.
Seasonal flows explain the direction of the fee
Where demand is seasonal, the natural flow reverses through the year, and companies price accordingly rather than applying a flat charge.
A route that is expensive in one direction can be inexpensive or free in the other, because that movement solves the company's problem rather than creating it.
Checking the fee both ways before booking is worthwhile, since the difference can be large enough to reshape an itinerary.
Relocation deals exist for the same reason
Companies periodically offer heavily discounted rentals to customers willing to drive a vehicle along the route they need it moved.
These come with conditions on dates, distance and duration, since the vehicle is required at the destination by a particular time.
They suit travellers whose plans align with the direction of the imbalance, and they are most common with motorhomes where repositioning is expensive.
Cross-border drops add further restrictions
Taking a vehicle into another country introduces insurance, registration and recovery considerations that are separate from the relocation cost.
Some agreements prohibit it entirely, others permit it with notice and an additional charge, and the permitted list can differ between branches of the same company.
Declaring the intended route at booking rather than at the counter avoids the situation where a planned crossing turns out not to be allowed.