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

Return flights

04 May - 16 May	Air Canada
15 May - 08 Jun	Air Canada
15 May - 30 May	Air Canada
03 May - 16 May	Air Canada
19 May - 31 May	Air Canada
01 May - 11 May	Air Canada
02 May - 08 Jun	Air Canada
22 May - 07 Jun	Air Canada
29 May - 07 Jun	Air Canada
02 May - 16 May	Air Canada
02 May - 15 May	Air Canada
29 May - 21 Jun	Air Canada
12 May - 19 May	Alaska Airlines
06 May - 15 May	Cathay Pacific
18 May - 31 May	Alaska Airlines
24 May - 06 Jun	Alaska Airlines
29 May - 15 Jun	Air Canada
13 May - 13 Jun	Asiana Airlines
15 May - 05 Jun	Asiana Airlines
15 May - 26 Jun	Asiana Airlines

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

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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Washington to Seoul in May from $1101

Return flights