Cheapest return IAD–ICN flights, May

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

Return flights

22 May - 30 May Air Premia
31 May - 17 Jun Air Premia
15 May - 24 May Air Premia
18 May - 31 May Air Premia direct
29 May - 12 Jun Air Premia
31 May - 22 Jun Air Premia
31 May - 19 Jun Air Premia
22 May - 25 May Air Premia
27 May - 08 Jun Porter Airlines (Canada) Ltd
15 May - 29 Jun Air Premia
29 May - 22 Jun Porter Airlines (Canada) Ltd
29 May - 29 Jun Porter Airlines (Canada) Ltd
13 May - 20 May Air Premia direct
29 May - 26 Jun Porter Airlines (Canada) Ltd
16 May - 02 Jun WestJet
23 May - 30 May Frontier Airlines
10 May - 24 May Frontier Airlines
11 May - 18 May Turkish Airlines
10 May - 17 May Air Premia direct
10 May - 24 May Air Premia direct

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

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