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

Return flights

14 Oct - 17 Oct	Korean Air
15 Oct - 19 Oct	Korean Air
19 Oct - 24 Oct	Korean Air
16 Oct - 21 Oct	Korean Air
17 Oct - 22 Oct	Korean Air
22 Oct - 26 Oct	Korean Air
10 Oct - 15 Oct	Korean Air
15 Oct - 18 Oct	Korean Air
15 Oct - 22 Oct	Korean Air
17 Oct - 20 Oct	Korean Air
19 Oct - 13 Nov	ANA
27 Oct - 01 Nov	ANA
30 Oct - 02 Nov	ANA
31 Oct - 03 Nov	ANA
29 Oct - 03 Nov	ANA
30 Oct - 03 Nov	ANA

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

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 October from $330

Return flights