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

Return flights

14 Sep - 21 Sep	Thai AirAsia
05 Sep - 21 Sep	Thai AirAsia
14 Sep - 28 Sep	Thai AirAsia
14 Sep - 29 Sep	Thai AirAsia
05 Sep - 10 Sep	Thai AirAsia
26 Sep - 28 Sep	Thai AirAsia
26 Sep - 29 Sep	Thai AirAsia
14 Sep - 02 Oct	Thai AirAsia
26 Sep - 02 Oct	Thai AirAsia
26 Sep - 08 Oct	Thai AirAsia
08 Sep - 21 Sep	Thai AirAsia
08 Sep - 10 Sep	Thai AirAsia
05 Sep - 07 Sep	Thai AirAsia
26 Sep - 09 Oct	Thai AirAsia
26 Sep - 06 Oct	Thai AirAsia
26 Sep - 10 Oct	Thai AirAsia
26 Sep - 11 Oct	Thai AirAsia
26 Sep - 14 Oct	Thai AirAsia
27 Sep - 02 Oct	AirAsia
27 Sep - 08 Oct	AirAsia

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

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 Vientiane to Phnom-penh in September from 239€

Return flights