Vietnam Airlines from Luang Prabang to Siem Reap has 1 flight every day. And there are 7 flights per week flying out of Luang Prabang which connect to Siem Reap.
The price for economy class – one way ticket of Vietnam Airlines from Luang Prabang to Siem Reap is 9.795.000 VND (or ~$488 USD)