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

Return flights

03 May - 23 May	Air Canada
26 May - 23 Jun	WestJet
25 May - 22 Jun	WestJet
24 May - 23 Jun	Air Canada
23 May - 22 Jun	WestJet
26 May - 04 Jun	China Airlines
26 May - 17 Jun	China Airlines
03 May - 23 May	United	direct
26 May - 23 Jun	Asiana Airlines	direct
25 May - 22 Jun	Asiana Airlines	direct
26 May - 04 Jun	Asiana Airlines	direct
26 May - 17 Jun	Asiana Airlines	direct

Also check the deals for one-way flights from San Francisco 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 San Francisco to Seoul in May from 887€

Return flights