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

Return flights

07 Sep - 23 Sep	Thai AirAsia
16 Sep - 02 Oct	Thai AirAsia
07 Sep - 27 Sep	Thai AirAsia
16 Sep - 23 Sep	Thai AirAsia
16 Sep - 27 Sep	Thai AirAsia
25 Sep - 02 Oct	Thai AirAsia
25 Sep - 08 Oct	Thai AirAsia
25 Sep - 27 Sep	Thai AirAsia
16 Sep - 06 Oct	Thai AirAsia
25 Sep - 07 Oct	Thai AirAsia
25 Sep - 12 Oct	Thai AirAsia
25 Sep - 06 Oct	Thai 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.

Book a cheap hotel in Phnom-penh

Cheap car rent in Phnom-penh

Cheapest return flights from Vientiane to Phnom-penh in September from $294

Return flights