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

Return flights

13 Apr - 22 Apr	Alaska Airlines
15 Apr - 29 Apr	Alaska Airlines
09 Apr - 22 Apr	Alaska Airlines
17 Apr - 02 May	Alaska Airlines
11 Apr - 27 Apr	Alaska Airlines
04 Apr - 19 Apr	Alaska Airlines
03 Apr - 19 Apr	Hawaiian Airlines
08 Apr - 15 Apr	Korean Air
08 Apr - 21 Apr	Korean Air
08 Apr - 22 Apr	Korean Air
11 Apr - 18 Apr	Korean Air
22 Apr - 23 May	Korean Air
26 Apr - 02 May	Korean Air
23 Apr - 04 May	Korean Air
21 Apr - 07 May	Korean Air
22 Apr - 21 May	Korean Air
27 Apr - 08 May	Korean Air
26 Apr - 08 May	Korean Air
26 Apr - 03 May	Korean Air
30 Apr - 03 May	Korean Air

Also check the deals for one-way flights from Oakland 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 Oakland to Seoul in April from $675

Return flights