AirHint found the following cheapest return flights from Colombo (CMB) to Vientiane (VTE) in September 2025 (see full year).

Return flights

28 Sep - 14 Oct	Thai AirAsia
30 Sep - 14 Oct	Thai AirAsia
30 Sep - 20 Oct	Thai AirAsia
27 Sep - 14 Oct	Thai AirAsia
28 Sep - 11 Oct	Thai AirAsia
19 Sep - 25 Sep	Thai AirAsia
30 Sep - 11 Oct	Thai AirAsia
27 Sep - 11 Oct	Thai AirAsia
19 Sep - 27 Sep	Thai AirAsia

Also check the deals for one-way flights from Colombo 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 Colombo to Vientiane in September from 342€

Return flights