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

Return flights

28 May - 30 May	Air Canada
04 May - 18 May	Air Canada
06 May - 16 May	Air Canada
18 May - 24 May	Air Canada
20 May - 14 Jun	Air Canada
18 May - 14 Jun	Air Canada
19 May - 14 Jun	Air Canada
16 May - 14 Jun	Air Canada
17 May - 08 Jun	Air Canada
17 May - 14 Jun	Air Canada
17 May - 09 Jun	Air Canada
18 May - 08 Jun	Air Canada
16 May - 06 Jun	Air Canada
01 May - 09 Jun	Air Canada
08 May - 21 May	Air Canada
03 May - 09 May	Air Canada
03 May - 08 May	Air Canada
02 May - 08 May	Air Canada
06 May - 19 May	Air Canada
12 May - 21 May	Air Canada

Also check the deals for one-way flights from Seoul to San Francisco 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 Seoul to San Francisco in May from 332€

Return flights