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

Return flights

27 Sep - 30 Sep	Japan Airlines
14 Sep - 17 Sep	Japan Airlines
10 Sep - 17 Sep	Japan Airlines
29 Sep - 02 Oct	Japan Airlines
28 Sep - 01 Oct	Japan Airlines
23 Sep - 26 Sep	Japan Airlines
28 Sep - 02 Oct	Japan Airlines
23 Sep - 28 Sep	Japan Airlines
29 Sep - 06 Oct	Japan Airlines
07 Sep - 10 Sep	Japan Airlines
26 Sep - 29 Sep	Japan Airlines
14 Sep - 16 Sep	Japan Airlines
22 Sep - 24 Sep	Japan Airlines
08 Sep - 10 Sep	Japan Airlines

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 496€

Return flights