AirHint found the following cheapest return flights from Seoul (ICN) to Taichung (RMQ) in September 2025 (see full year).

Return flights

23 Sep - 30 Sep	T'way Air	direct
13 Sep - 17 Sep	T'way Air	direct
10 Sep - 17 Sep	T'way Air	direct
10 Sep - 30 Sep	T'way Air	direct
13 Sep - 16 Sep	T'way Air	direct
27 Sep - 29 Sep	T'way Air	direct
12 Sep - 17 Sep	T'way Air	direct
10 Sep - 16 Sep	T'way Air	direct
13 Sep - 15 Sep	T'way Air	direct
09 Sep - 16 Sep	T'way Air	direct
28 Sep - 05 Oct	HK Express
26 Sep - 03 Oct	T'way Air	direct
30 Sep - 05 Oct	T'way Air	direct
28 Sep - 05 Oct	Korean Air	direct

Also check the deals for one-way flights from Seoul to Taichung 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 Seoul to Taichung in September from $131

Return flights