AirHint found the following cheapest return flights from Oakland (OAK) to Seoul (ICN) in October 2025 (see full year).

Return flights

01 Oct - 13 Oct	Alaska Airlines
30 Oct - 08 Nov	Alaska Airlines
26 Oct - 02 Nov	Alaska Airlines
21 Oct - 24 Oct	Alaska Airlines
05 Oct - 19 Oct	Alaska Airlines
19 Oct - 23 Oct	Hawaiian Airlines
01 Oct - 15 Oct	Korean Air
01 Oct - 20 Oct	Korean Air
01 Oct - 10 Oct	Korean Air
05 Oct - 22 Oct	Korean Air
01 Oct - 12 Nov	Korean Air
05 Oct - 05 Nov	Korean Air
19 Oct - 26 Oct	Hawaiian Airlines
02 Oct - 15 Oct	Hawaiian Airlines
28 Oct - 05 Nov	Korean Air
28 Oct - 08 Nov	Korean Air
26 Oct - 11 Nov	Korean Air
05 Oct - 03 Nov	Korean Air
27 Oct - 05 Nov	Korean Air
22 Oct - 05 Nov	Korean Air

Also check the deals for one-way flights from Oakland to Seoul in October.

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 October from $657

Return flights