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

Return flights

21 May - 26 May	Korean Air
30 May - 03 Jun	EVA Air
22 May - 26 May	EVA Air
22 May - 27 May	EVA Air
20 May - 26 May	EVA Air
16 May - 19 May	EVA Air
15 May - 19 May	EVA Air
16 May - 20 May	EVA Air
15 May - 20 May	EVA Air
09 May - 12 May	EVA Air
29 May - 03 Jun	EVA Air
20 May - 27 May	EVA Air
30 May - 01 Jun	EVA Air
30 May - 06 Jun	Air China
27 May - 02 Jun	Air China
31 May - 06 Jun	Air China
31 May - 05 Jun	Air China
29 May - 01 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 $310

Return flights