AirHint found the following cheapest return flights from Seoul (GMP) to Singapore (SIN) in July 2025 (see full year).

Return flights

03 Jul - 06 Jul	China Eastern
03 Jul - 09 Jul	China Eastern
02 Jul - 06 Jul	Jeju Air
14 Jul - 21 Jul	Eastar Jet
03 Jul - 08 Jul	T'way Air
02 Jul - 05 Jul	Jeju Air
05 Jul - 08 Jul	Jeju Air
01 Jul - 02 Jul	Jeju Air
07 Jul - 09 Jul	Eastar Jet
01 Jul - 06 Jul	Jeju Air
15 Jul - 22 Aug	Jeju Air
14 Jul - 21 Aug	Jeju Air
23 Jul - 11 Aug	Jeju Air
24 Jul - 26 Aug	Peach
17 Jul - 14 Aug	Jeju Air
20 Jul - 12 Aug	Jeju Air
27 Jul - 02 Aug	China Eastern
08 Jul - 01 Aug	Air China
29 Jul - 12 Aug	Jeju Air
30 Jul - 12 Aug	Jeju Air

Also check the deals for one-way flights from Seoul to Singapore in July.

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 July from $265

Return flights