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

Return flights

01 Apr - 18 Apr	Hawaiian Airlines
15 Apr - 30 Apr	Alaska Airlines
02 Apr - 18 Apr	Alaska Airlines
14 Apr - 22 Apr	Alaska Airlines
25 Apr - 09 May	Air Canada
02 Apr - 18 Apr	United	direct
01 Apr - 18 Apr	United	direct
15 Apr - 30 Apr	United	direct
14 Apr - 22 Apr	United	direct
25 Apr - 09 May	United	direct

Also check the deals for one-way flights from San Francisco 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.

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Cheapest return flights from San Francisco to Seoul in April from $656

Return flights