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

Return flights

01 Apr - 06 Apr	Jeju Air
01 Apr - 09 Apr	Jeju Air
01 Apr - 05 Apr	Jeju Air
04 Apr - 05 Apr	Jeju Air
04 Apr - 06 Apr	Jeju Air
01 Apr - 02 Apr	Jeju Air
25 Apr - 11 May	Jeju Air
03 Apr - 06 Apr	Jeju Air
18 Apr - 23 Apr	Jeju Air
25 Apr - 27 Apr	Jeju Air
22 Apr - 27 Apr	Jeju Air
17 Apr - 08 May	Jeju Air
08 Apr - 10 May	Jeju Air
25 Apr - 01 May	Jeju Air
22 Apr - 01 May	Jeju Air
21 Apr - 01 May	Jeju Air
30 Apr - 07 May	Korean Air
28 Apr - 07 May	Jeju Air
28 Apr - 01 May	Jeju Air
29 Apr - 06 May	EVA Air

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

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 April from 251€

Return flights