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

Return flights

06 May - 29 May	Etihad Airways
21 May - 04 Jun	Porter Airlines (Canada) Ltd
01 May - 10 May	Etihad Airways
05 May - 19 Jun	Turkish Airlines
15 May - 25 Jun	Turkish Airlines
15 May - 05 Jun	Turkish Airlines
15 May - 26 Jun	Turkish Airlines
18 May - 25 May	WestJet
05 May - 09 May	Alaska Airlines
15 May - 06 Jun	Turkish Airlines
01 May - 10 May	Air Premia	direct
06 May - 29 May	Air Premia	direct
27 May - 06 Jun	EVA Air
31 May - 07 Jun	Turkish Airlines
23 May - 30 May	Air Canada
15 May - 05 Jun	Air Premia	direct
15 May - 26 Jun	Air Premia	direct
18 May - 25 May	Air Premia	direct
19 May - 26 May	Delta	direct
23 May - 30 May	Delta	direct

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.

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Cheapest return flights from Washington to Seoul in May from $1086

Return flights