Kampot Tour offers 3 daily buses from Kep to Sihanoukville. Though the average price for this trip is $15, you can find tickets starting at $15. The trip between the two cities usually takes about 180.
Champa Tourist Bus offers 2 daily buses from Kep to Sihanoukville. Though the average price for this trip is $13, you can find tickets starting at $13. The trip between the two cities usually takes about 225.