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

Return flights

09 May - 13 May	Jeju Air
12 May - 13 May	Jeju Air
09 May - 12 May	Jeju Air
07 May - 12 May	Jeju Air
07 May - 14 May	Jeju Air
14 May - 19 May	Jeju Air
11 May - 16 May	Jeju Air
05 May - 12 May	Jeju Air
06 May - 12 May	Jeju Air
06 May - 14 May	Jeju Air
29 May - 03 Jun	Jeju Air
22 May - 03 Jun	T'way Air
27 May - 06 Jun	Air China
27 May - 05 Jun	Air China
30 May - 03 Jun	Air China
22 May - 07 Jun	Air China
30 May - 06 Jun	Air China
31 May - 05 Jun	Jeju Air

Also check the deals for one-way flights from Seoul to Singapore 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 Singapore in May from $397

Return flights