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

Return flights

15 Apr - 22 Apr	Jeju Air
08 Apr - 15 Apr	Jeju Air
07 Apr - 14 Apr	Jeju Air
09 Apr - 14 Apr	Jeju Air
23 Apr - 28 Apr	Jeju Air
07 Apr - 17 Apr	Jeju Air
13 Apr - 17 Apr	Jeju Air
15 Apr - 17 Apr	Jeju Air
20 Apr - 23 Apr	Jeju Air
13 Apr - 16 Apr	Jeju Air
27 Apr - 08 May	Jeju Air
27 Apr - 09 May	Jeju Air
27 Apr - 10 May	Jeju Air
17 Apr - 18 May	Jeju Air
25 Apr - 31 May	Jeju Air
26 Apr - 28 May	Jeju Air
28 Apr - 04 May	Jeju Air
23 Apr - 04 May	T'way Air
29 Apr - 03 May	Jeju Air
29 Apr - 04 May	Jeju Air

Also check the deals for one-way flights from Seoul to Singapore 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 Singapore in April from $370

Return flights