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

Return flights

21 Apr - 26 May	Japan Airlines
22 Apr - 25 May	Japan Airlines
27 Apr - 26 May	ANA
28 Apr - 26 May	ANA
22 Apr - 26 May	ANA
15 Apr - 22 Apr	ANA
21 Apr - 28 Apr	ANA
19 Apr - 06 May	ANA
16 Apr - 07 May	ANA
30 Apr - 07 May	ANA
24 Apr - 26 May	ANA
09 Apr - 16 Apr	ANA
01 Apr - 15 Apr	Etihad Airways
09 Apr - 24 May	ANA
13 Apr - 20 Apr	ANA
10 Apr - 17 Apr	ANA
12 Apr - 19 Apr	ANA
04 Apr - 10 Apr	ANA
05 Apr - 10 Apr	ANA
01 Apr - 10 Apr	Qatar Airways

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

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 April from 1410€

Return flights