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

Return flights

25 Aug - 29 Aug	Air Busan
22 Aug - 28 Aug	Korean Air
28 Aug - 30 Aug	Korean Air
24 Aug - 29 Aug	Korean Air
24 Aug - 28 Aug	Korean Air
26 Aug - 31 Aug	Korean Air
25 Aug - 28 Aug	Korean Air
28 Aug - 31 Aug	Korean Air
26 Aug - 30 Aug	Korean Air
27 Aug - 03 Sep	Korean Air
29 Aug - 05 Sep	Korean Air
30 Aug - 03 Sep	Korean Air
16 Aug - 24 Aug	Korean Air
22 Aug - 16 Sep	Korean Air
30 Aug - 02 Sep	Korean Air
29 Aug - 02 Sep	Korean Air

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

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 August from $311

Return flights