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

Return flights

05 Sep - 15 Sep	Thai AirAsia
01 Sep - 15 Sep	Thai AirAsia
10 Sep - 15 Sep	Thai AirAsia
05 Sep - 14 Sep	Thai AirAsia
01 Sep - 14 Sep	Thai AirAsia
10 Sep - 14 Sep	Thai AirAsia
03 Sep - 10 Sep	Thai AirAsia
08 Sep - 15 Sep	Thai VietJet Air
21 Sep - 07 Oct	Thai AirAsia
03 Sep - 15 Sep	Thai AirAsia
08 Sep - 14 Sep	Thai AirAsia
28 Sep - 07 Oct	Thai AirAsia
29 Sep - 07 Oct	Thai AirAsia
21 Sep - 12 Oct	Thai AirAsia
28 Sep - 12 Oct	Thai AirAsia
28 Sep - 18 Oct	Thai AirAsia
29 Sep - 12 Oct	Thai AirAsia
29 Sep - 18 Oct	Thai AirAsia
21 Sep - 11 Oct	Thai AirAsia
28 Sep - 11 Oct	Thai AirAsia

Also check the deals for one-way flights from Phnom-penh to Vientiane 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 Phnom-penh to Vientiane in September from 239€

Return flights