The easiest way to to get to your destination is a direct flight. Direct flights for from Phnom Penh to Siem Reap are offered by:
Aviasales.ge suggests buying tickets for Phnom Penh – Siem Reap in advance in order to choose the conditions for your flight that best suit your preferences and budget.
Phnom Penh airports serving flights to Siem Reap:
Siem Reap airports accepting flights from Phnom Penh: