Cheapest return DCA–ICN flights, May

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

Return flights

27 May - 03 Jun Alaska Airlines
27 May - 04 Jun Alaska Airlines
11 May - 18 May Frontier Airlines
18 May - 31 May Frontier Airlines
14 May - 20 May Frontier Airlines
30 May - 08 Jun Frontier Airlines
18 May - 10 Jun Air Canada
18 May - 26 May Air Canada
14 May - 04 Jun Frontier Airlines
11 May - 16 May Air Canada
24 May - 06 Jun Air Canada
22 May - 04 Jun Air Canada
24 May - 15 Jun Alaska Airlines
30 May - 27 Jun Frontier Airlines
10 May - 16 May Air Canada
30 May - 28 Jun Frontier Airlines
20 May - 30 May WestJet
24 May - 30 May Alaska Airlines
09 May - 16 May Air Canada
21 May - 30 May Frontier Airlines

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

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