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

Return flights

07 May - 12 May	Jeju Air
05 May - 12 May	Jeju Air
09 May - 13 May	Jeju Air
09 May - 12 May	Jeju Air
11 May - 14 May	Jeju Air
07 May - 11 May	Jeju Air
07 May - 14 May	Jeju Air
07 May - 09 May	Jeju Air
11 May - 18 May	Jeju Air
05 May - 09 May	Jeju Air
26 May - 01 Jun	Jeju Air
19 May - 01 Jun	Jeju Air
27 May - 01 Jun	Jeju Air
22 May - 14 Jun	Jeju Air
21 May - 13 Jun	Air China
21 May - 14 Jun	Air China
22 May - 13 Jun	Jeju Air
30 May - 06 Jun	T'way 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 295€

Return flights