AirHint found the following cheapest return flights from Washington (DCA) to Taipei (TPE) in September 2025 (see full year).

Return flights

05 Sep - 15 Sep	Alaska Airlines
05 Sep - 16 Sep	Alaska Airlines
05 Sep - 18 Sep	Alaska Airlines
05 Sep - 19 Sep	Alaska Airlines
05 Sep - 14 Sep	Alaska Airlines
07 Sep - 17 Sep	Alaska Airlines
06 Sep - 17 Sep	Alaska Airlines
08 Sep - 17 Sep	Alaska Airlines
02 Sep - 23 Sep	China Airlines
08 Sep - 19 Sep	Alaska Airlines
20 Sep - 03 Oct	China Airlines

Also check the deals for one-way flights from Washington to Taipei 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 Washington to Taipei in September from $897

Return flights