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

Return flights

12 Sep - 19 Sep	VietJet Air
20 Sep - 23 Sep	China Southern
05 Sep - 11 Sep	China Southern
25 Sep - 26 Oct	VietJet Air
05 Sep - 10 Sep	VietJet Air
02 Sep - 15 Sep	Thai AirAsia
12 Sep - 20 Sep	China Southern
02 Sep - 05 Sep	Thai AirAsia
02 Sep - 17 Sep	Thai AirAsia
02 Sep - 08 Sep	Thai AirAsia
27 Sep - 17 Oct	Thai AirAsia
09 Sep - 15 Sep	Thai AirAsia
27 Sep - 15 Oct	Thai AirAsia
25 Sep - 15 Oct	Thai AirAsia
21 Sep - 11 Oct	Thai AirAsia
20 Sep - 11 Oct	Thai AirAsia
27 Sep - 16 Oct	Thai AirAsia
27 Sep - 11 Oct	Thai AirAsia
25 Sep - 16 Oct	Thai AirAsia
25 Sep - 11 Oct	Thai AirAsia

Also check the deals for one-way flights from Vientiane to Seoul 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 Seoul in September from $319

Return flights