Cheapest return IAD–ICN flights, September

AirHint found the following cheapest return flights from Washington (IAD) to Seoul (ICN) in September 2026 (see full year).

Return flights

01 Sep - 10 Sep Frontier Airlines
03 Sep - 14 Sep EVA Air
08 Sep - 18 Sep EVA Air
07 Sep - 27 Sep Frontier Airlines
03 Sep - 29 Sep Frontier Airlines
04 Sep - 16 Sep Air Premia direct
16 Sep - 21 Sep Air Premia direct
07 Sep - 30 Sep Air Premia direct
14 Sep - 16 Oct Frontier Airlines
23 Sep - 09 Oct Turkish Airlines
25 Sep - 30 Oct Air Premia direct
17 Sep - 22 Sep Alaska Airlines
13 Sep - 21 Sep Air Premia direct
23 Sep - 09 Oct Air Premia direct
07 Sep - 01 Oct WestJet
14 Sep - 16 Oct Air Premia direct
25 Sep - 11 Oct Air Premia direct
07 Sep - 01 Oct Delta direct
19 Sep - 11 Oct Delta direct

Also check the deals for one-way flights from Washington to Seoul in September.

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