AirHint found the following cheapest return flights from Seoul (ICN) to Vientiane (VTE) in March 2026 (see full year).

Return flights

21 Mar - 31 Mar	Vietnam Airlines
03 Mar - 31 Mar	Vietnam Airlines
25 Mar - 31 Mar	Vietnam Airlines
27 Mar - 31 Mar	Vietnam Airlines
14 Mar - 19 Mar	T'way Air	direct
22 Mar - 26 Mar	T'way Air	direct
17 Mar - 25 Mar	T'way Air	direct
17 Mar - 27 Mar	T'way Air	direct
24 Mar - 28 Mar	T'way Air	direct
09 Mar - 13 Mar	T'way Air	direct
26 Mar - 02 Apr	VietJet Air

Also check the deals for one-way flights from Seoul to Vientiane in March.

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 Seoul to Vientiane in March from $280

Return flights