Currently, we have not found any bus departure from Siem Reap to Pattaya (via Koh Kong border). But, you might consider these trip(s) that our fellows did to reach Pattaya (via Koh Kong border):

  1. Siem Reap to Phnom Penh and Phnom Penh to Pattaya (via Koh Kong border)
  2. Siem Reap to Koh Kong and Koh Kong to Pattaya (via Koh Kong border)