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

Return flights

29 Sep - 01 Oct	ANA
30 Sep - 02 Oct	ANA
25 Sep - 27 Sep	ANA
26 Sep - 30 Sep	ANA
25 Sep - 29 Sep	ANA
23 Sep - 26 Sep	Japan Airlines
10 Sep - 16 Sep	Japan Airlines
16 Sep - 19 Sep	Japan Airlines
25 Sep - 28 Sep	Japan Airlines
01 Sep - 04 Sep	ANA
10 Sep - 12 Sep	ANA
24 Sep - 26 Sep	ANA

Also check the deals for one-way flights from Osaka 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 Osaka to Agana in September from $359

Return flights