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

Return flights

14 Jan - 18 Feb	Turkish Airlines
12 Jan - 25 Feb	Turkish Airlines
22 Jan - 05 Feb	Turkish Airlines
25 Jan - 06 Feb	Turkish Airlines
13 Jan - 20 Jan	Turkish Airlines
06 Jan - 15 Jan	Turkish Airlines
01 Jan - 07 Jan	Turkish Airlines
07 Jan - 15 Jan	Turkish Airlines
13 Jan - 20 Jan	Delta	direct
22 Jan - 05 Feb	Delta	direct
14 Jan - 18 Feb	Delta	direct
12 Jan - 25 Feb	Delta	direct
25 Jan - 06 Feb	Korean Air	direct
07 Jan - 15 Jan	Delta	direct
06 Jan - 15 Jan	Korean Air	direct
01 Jan - 07 Jan	Delta	direct

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

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 January from 951€

Return flights