AirHint found the following cheapest return flights from Osaka (KIX) to Keflavik (KEF) in September 2025 (see full year).

Return flights

05 Sep - 11 Sep	Air Canada
18 Sep - 27 Sep	Singapore Airlines
22 Sep - 27 Sep	Singapore Airlines
13 Sep - 22 Sep	Singapore Airlines
13 Sep - 23 Sep	Singapore Airlines
06 Sep - 11 Sep	Singapore Airlines
12 Sep - 22 Sep	Singapore Airlines
11 Sep - 18 Sep	Singapore Airlines
06 Sep - 14 Sep	Singapore Airlines
11 Sep - 21 Sep	Singapore Airlines
27 Sep - 04 Oct	Singapore Airlines

Also check the deals for one-way flights from Osaka to Keflavik 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 Keflavik in September from 1202€

Return flights