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

Return flights

25 Apr - 28 Apr	EVA Air
22 Apr - 29 Apr	EVA Air
11 Apr - 16 Apr	EVA Air
11 Apr - 14 Apr	EVA Air
11 Apr - 15 Apr	EVA Air
01 Apr - 08 Apr	EVA Air
03 Apr - 05 Apr	Air China
05 Apr - 12 Apr	Air China
09 Apr - 16 Apr	Air China
15 Apr - 19 Apr	Air China
13 Apr - 07 May	Air China
13 Apr - 08 May	Air China
30 Apr - 06 May	Air China
30 Apr - 05 May	Air China
30 Apr - 04 May	Air China
04 Apr - 09 May	Air China

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 $444

Return flights