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

Return flights

06 Apr - 17 Apr	Alaska Airlines
08 Apr - 17 Apr	Alaska Airlines
06 Apr - 13 Apr	Alaska Airlines
02 Apr - 09 Apr	Alaska Airlines
15 Apr - 22 Apr	Korean Air
07 Apr - 15 Apr	Korean Air
06 Apr - 22 Apr	Korean Air
01 Apr - 30 Apr	Korean Air
21 Apr - 28 Apr	Korean Air
28 Apr - 05 May	Korean Air
29 Apr - 06 May	Korean Air
29 Apr - 15 May	Korean Air
08 Apr - 18 Apr	Alaska Airlines
21 Apr - 18 May	Korean Air
27 Apr - 04 May	Alaska Airlines
20 Apr - 04 May	Korean Air
22 Apr - 03 May	Korean Air
24 Apr - 03 May	Alaska Airlines
25 Apr - 04 May	Korean Air

Also check the deals for one-way flights from San Jose 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 Jose to Seoul in April from $615

Return flights