Bus from Split to Kotor?

I did that route in reverse in 2015. I think I probably had to change buses in Dubrovnik. The buses were comfortable. You should expect to be charged 1 or 2 euros for each piece of luggage stored beneath the bus. Some bus drivers are sticklers for having everyone in the seat indicated on their ticket; one bus I took turned into a game of musical chairs. Other drivers don't seem to care.

One of the websites that purports to show Croatian bus schedules is buscroatia.com. I just took a look at it and found no through buses from Kotor to Split on October 24 (randomly chosen date), but there were several buses to Dubrovnik.