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

07 Sep - 27 Sep Air Premia direct
04 Sep - 20 Sep Air Premia direct
06 Sep - 20 Sep Air Premia direct
07 Sep - 30 Sep Air Premia direct
04 Sep - 14 Sep Air Premia direct
06 Sep - 14 Sep Air Premia direct
04 Sep - 07 Sep Air Premia direct
28 Sep - 11 Oct Air Premia direct
11 Sep - 20 Sep Air Premia direct
18 Sep - 27 Sep Air Premia direct
13 Sep - 30 Sep Air Premia direct
23 Sep - 09 Oct Air Premia direct
25 Sep - 30 Oct Air Premia direct
24 Sep - 05 Oct Frontier Airlines
27 Sep - 19 Oct Frontier Airlines
25 Sep - 11 Oct Air Premia direct
27 Sep - 19 Oct Air Premia direct
24 Sep - 05 Oct Delta direct
19 Sep - 11 Oct Delta direct
26 Sep - 04 Oct Delta direct

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

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