AirHint found the following cheapest return flights from Phnom-penh (PNH) to Vientiane (VTE) in August 2025 (see full year).

Return flights

01 Aug - 07 Aug	Thai AirAsia
26 Aug - 12 Sep	Thai AirAsia
03 Aug - 07 Aug	Thai AirAsia
01 Aug - 06 Aug	Thai AirAsia
26 Aug - 10 Sep	Thai AirAsia
26 Aug - 02 Sep	Thai AirAsia
01 Aug - 12 Sep	Thai AirAsia
25 Aug - 12 Sep	Thai AirAsia
03 Aug - 06 Aug	Thai AirAsia
25 Aug - 10 Sep	Thai AirAsia
25 Aug - 02 Sep	Thai AirAsia
01 Aug - 05 Aug	Thai AirAsia
05 Aug - 07 Aug	Thai AirAsia
03 Aug - 05 Aug	Thai AirAsia
01 Aug - 12 Sep	Vietnam Airlines	direct

Also check the deals for one-way flights from Phnom-penh to Vientiane in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Phnom-penh to Vientiane in August from $305

Return flights