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

Return flights

18 Sep - 21 Sep	T'way Air
10 Sep - 13 Sep	Korean Air
07 Sep - 09 Sep	Korean Air
14 Sep - 16 Sep	Korean Air
16 Sep - 25 Sep	Korean Air
20 Sep - 25 Sep	Korean Air
06 Sep - 11 Sep	Korean Air
04 Sep - 10 Sep	Korean Air
06 Sep - 12 Sep	Korean Air
14 Sep - 18 Sep	Korean Air
28 Sep - 02 Oct	Korean Air
27 Sep - 01 Oct	Korean Air
27 Sep - 03 Oct	Korean Air
29 Sep - 03 Oct	Korean Air
26 Sep - 04 Oct	Korean Air
29 Sep - 04 Oct	Korean Air
29 Sep - 05 Oct	Korean Air
28 Sep - 04 Oct	Korean Air
30 Sep - 03 Oct	Korean Air
30 Sep - 04 Oct	Korean Air

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

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 September from $287

Return flights