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

Return flights

09 Apr - 13 Apr	Air China
17 Apr - 21 Apr	Air China
12 Apr - 16 Apr	Air China
01 Apr - 23 Apr	Air China
04 Apr - 09 Apr	Air China
14 Apr - 19 Apr	Air China
04 Apr - 07 Apr	Air China
10 Apr - 13 Apr	Air China
10 Apr - 16 Apr	Air China
16 Apr - 20 Apr	Air China
30 Apr - 10 May	Air China
30 Apr - 09 May	Air China
30 Apr - 12 May	Air China
30 Apr - 05 May	Air China
24 Apr - 04 May	Air China
30 Apr - 06 May	Air China
30 Apr - 04 May	Air China
06 Apr - 04 May	Air China
29 Apr - 05 May	Japan Airlines
29 Apr - 09 May	Japan Airlines

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 $510

Return flights