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

Return flights

23 Mar - 14 Apr	Turkish Airlines
02 Mar - 23 Mar	Turkish Airlines
20 Mar - 03 Apr	Turkish Airlines
17 Mar - 24 Mar	Turkish Airlines
02 Mar - 28 Mar	Turkish Airlines
17 Mar - 23 Mar	Turkish Airlines
15 Mar - 02 Apr	Turkish Airlines
17 Mar - 22 Mar	Turkish Airlines
02 Mar - 23 Mar	Delta	direct
23 Mar - 14 Apr	Delta	direct
02 Mar - 28 Mar	Delta	direct
20 Mar - 03 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 $1050

Return flights