AirHint found the following cheapest one-way flights from Tokyo (NRT) to Seoul (ICN) in September 2025 (see full year).

One-Way flights

02 Sep	Eastar Jet	direct
30 Sep	Air Busan	direct
09 Sep	T'way Air	direct
28 Sep	Zipair	direct
24 Sep	Zipair	direct
03 Sep	T'way Air	direct
17 Sep	T'way Air	direct
18 Sep	T'way Air	direct
27 Sep	T'way Air	direct
29 Sep	Air Japan	direct

Also check the deals for return flights from Tokyo to Seoul 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 one-way flights from Tokyo to Seoul in September from $57

One-Way flights