AirHint found the following cheapest return flights from Washington (IAD) to Seoul (ICN) in July 2025 (see full year).

Return flights

22 Jul - 03 Aug	Air Canada
23 Jul - 02 Aug	Air Canada
17 Jul - 21 Aug	Air Canada
23 Jul - 03 Aug	Air Canada
22 Jul - 05 Aug	Air Canada
16 Jul - 23 Jul	Frontier Airlines
22 Jul - 29 Jul	Air Canada
14 Jul - 30 Jul	Air Canada
24 Jul - 07 Aug	Air Canada
22 Jul - 31 Jul	Air Canada
23 Jul - 13 Aug	Frontier Airlines
24 Jul - 29 Jul	Air Canada
24 Jul - 28 Jul	Air Canada
15 Jul - 19 Jul	Frontier Airlines
15 Jul - 17 Jul	Air Canada
23 Jul - 08 Aug	Hawaiian Airlines
25 Jul - 05 Aug	Air Canada
15 Jul - 01 Aug	Air Canada
22 Jul - 29 Jul	Delta	direct
15 Jul - 17 Jul	Korean Air	direct

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

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 July from $1216

Return flights