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

Return flights

24 Mar - 31 Mar	Air China
13 Mar - 20 Mar	Air China
10 Mar - 31 Mar	Air China
04 Mar - 11 Mar	Turkish Airlines
16 Mar - 17 Apr	Turkish Airlines
16 Mar - 03 Apr	Turkish Airlines
09 Mar - 27 Mar	Turkish Airlines
08 Mar - 24 Mar	Turkish Airlines
08 Mar - 27 Mar	Turkish Airlines
04 Mar - 30 Mar	Turkish Airlines
21 Mar - 03 Apr	Turkish Airlines
23 Mar - 13 Apr	Turkish Airlines
14 Mar - 20 Mar	Turkish Airlines
08 Mar - 22 Mar	Etihad Airways
19 Mar - 12 Apr	Turkish Airlines
15 Mar - 02 Apr	Turkish Airlines
30 Mar - 03 Apr	Turkish Airlines
29 Mar - 05 Apr	Turkish Airlines
27 Mar - 05 Apr	Etihad Airways
15 Mar - 02 Apr	Korean Air	direct

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

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 March from $883

Return flights