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

Return flights

06 Sep - 12 Sep	China Southern
11 Sep - 23 Sep	China Eastern
15 Sep - 20 Sep	Jeju Air
11 Sep - 25 Sep	China Southern
21 Sep - 27 Sep	Jetstar Japan
26 Sep - 06 Oct	Zipair
28 Sep - 18 Oct	Zipair
29 Sep - 08 Oct	Zipair
15 Sep - 17 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
08 Sep - 14 Sep	Air Canada
03 Sep - 14 Sep	Air Canada
05 Sep - 08 Sep	Air Canada
17 Sep - 01 Oct	LOT
26 Sep - 03 Oct	Qatar Airways
25 Sep - 06 Oct	Air Canada

Also check the deals for one-way flights from Tokyo 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 Tokyo to Keflavik in September from $986

Return flights