One way car hire in Europe

[flybynight]

Has anyone done this? We are thinking of travelling from Geneva Airport to Chamonix, then on to Lake Garda in Italy before returning the car to the airport in Venice. Despite googling, I'm struggling to get a clear picture of how much a one-way supplement would be. Any experience?

I've done one way before but only within one country, that was Italy.

IIRC when I was researching getting one in Spain and dropping in France, we had to contact the company for a quote. It can be really expensive over two countries. We didn't take them up on that one, it was prohibitive.

Can you get a train from Chamonix to Garda then pick up another car locally? There's also a good train service from Lake Garda to Venice if that helps.

Thank you for that Mary.