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

Return flights

29 Apr - 07 May	Turkish Airlines
30 Apr - 07 May	Turkish Airlines
11 Apr - 25 Apr	Frontier Airlines
11 Apr - 18 Apr	Turkish Airlines
04 Apr - 18 Apr	Turkish Airlines
07 Apr - 11 Apr	Frontier Airlines
01 Apr - 20 Apr	Hawaiian Airlines
01 Apr - 20 Apr	Delta	direct
29 Apr - 07 May	Delta	direct
30 Apr - 07 May	Delta	direct
11 Apr - 18 Apr	Delta	direct
04 Apr - 18 Apr	Delta	direct
11 Apr - 25 Apr	Delta	direct
07 Apr - 11 Apr	Delta	direct

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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Washington to Seoul in April from $1055

Return flights