AirHint found the following cheapest return flights from Seoul (GMP) to Agana (GUM) in December 2025 (see full year).

Return flights

15 Dec - 22 Dec	Jeju Air
16 Dec - 23 Dec	T'way Air
15 Dec - 19 Dec	T'way Air
15 Dec - 18 Dec	Eastar Jet
22 Dec - 25 Dec	Air Busan
29 Dec - 01 Jan	Air Busan
12 Dec - 19 Dec	Korean Air
12 Dec - 17 Dec	Korean Air
16 Dec - 18 Dec	Korean Air
13 Dec - 17 Dec	Korean Air
13 Dec - 18 Dec	Korean Air
15 Dec - 29 Jan	Korean Air
12 Dec - 30 Jan	Korean Air
31 Dec - 01 Jan	Korean Air
30 Dec - 01 Jan	Korean Air
28 Dec - 01 Jan	Korean Air
30 Dec - 06 Jan	Korean Air
31 Dec - 06 Jan	Korean Air
26 Dec - 01 Jan	Korean Air
27 Dec - 01 Jan	Korean Air

Also check the deals for one-way flights from Seoul to Agana in December.

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 Agana in December from $219

Return flights