AirHint found the following cheapest return flights from Seoul (GMP) to Bangkok (BKK) in May 2026 (see full year).

Return flights

13 May - 30 May	Korean Air
20 May - 24 May	Korean Air
12 May - 11 Jun	Air China
26 May - 31 May	Air China
10 May - 15 May	Air China
19 May - 24 May	Air China
23 May - 26 May	Air China
22 May - 25 May	Air China
19 May - 23 May	Air China
18 May - 24 May	Air China
28 May - 31 May	Air China
30 May - 03 Jun	Air China
30 May - 06 Jun	Air China
29 May - 01 Jun	Air China
29 May - 05 Jun	Air China
29 May - 06 Jun	Air China
01 May - 03 Jun	Air China

Also check the deals for one-way flights from Seoul to Bangkok in May.

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 Bangkok in May from 336€

Return flights