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

Return flights

13 Oct - 17 Oct	T'way Air
12 Oct - 17 Oct	Air Busan
13 Oct - 15 Oct	T'way Air
21 Oct - 23 Oct	Korean Air
10 Oct - 17 Oct	Korean Air
15 Oct - 20 Oct	Korean Air
12 Oct - 18 Oct	Korean Air
16 Oct - 18 Oct	Korean Air
12 Oct - 16 Oct	Korean Air
11 Oct - 24 Oct	Korean Air

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 189€

Return flights