When the journey is so long, the bus takes much longer than other transportation. You can have a look at flights to Grenoble: by booking in advance you can find very cheap tickets!
When are the buses of the line Cabourg - Grenoble scheduled?
To get from Cabourg to Grenoble by bus it will take you 15 hours and 10 minutes. The first departure is scheduled at 15:02, while the last bus is at 15:02.
Which companies can you travel with from Cabourg to Grenoble?
There are many companies cooperating with virail, among which also FlixBus with buses to Grenoble.
Flixbus is undoubtedly one of the youngest and most famous bus companies in whole Europe. With more than 40 millions passengers only in 2017, Flixbus offers national and international bus connections, also with night buses.