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

Return flights

14 May - 21 May	Korean Air
01 May - 21 May	Korean Air
08 May - 24 May	Korean Air
10 May - 07 Jun	Korean Air
25 May - 08 Jun	Korean Air
06 May - 25 May	Korean Air
15 May - 10 Jun	Korean Air
21 May - 30 May	Korean Air
31 May - 30 Jun	Korean Air
16 May - 30 May	Korean Air
08 May - 17 May	Korean Air
29 May - 07 Jun	Korean Air
29 May - 12 Jun	Korean Air
28 May - 16 Jun	Korean Air
18 May - 25 May	Korean Air
20 May - 31 May	Korean Air
22 May - 05 Jun	Korean Air

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

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 May from $1603

Return flights