AirHint found the following cheapest return flights from Tokyo (NRT) to Porto (OPO) in September 2025 (see full year).

Return flights

20 Sep - 25 Sep	Ethiopian Airlines
20 Sep - 27 Sep	Ethiopian Airlines
01 Sep - 09 Sep	KLM
02 Sep - 09 Sep	KLM
29 Sep - 09 Oct	Qatar Airways
23 Sep - 01 Oct	KLM
27 Sep - 09 Oct	Ethiopian Airlines
14 Sep - 20 Sep	Ethiopian Airlines
02 Sep - 16 Sep	Etihad Airways
22 Sep - 27 Sep	Etihad Airways
19 Sep - 28 Sep	KLM
20 Sep - 28 Sep	KLM
22 Sep - 29 Sep	Etihad Airways

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

Return flights