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

Return flights

14 May - 27 May	Philippine Airlines
27 May - 03 Jun	WestJet
13 May - 27 May	Flair Airlines
14 May - 23 May	Philippine Airlines
01 May - 31 May	WestJet
12 May - 19 May	Philippine Airlines
14 May - 28 May	Philippine Airlines
13 May - 26 May	Cathay Pacific
08 May - 23 May	WestJet
19 May - 03 Jun	Alaska Airlines
31 May - 10 Jun	Alaska Airlines
13 May - 27 May	Air Premia	direct
27 May - 03 Jun	Air Premia	direct
14 May - 28 May	Asiana Airlines	direct
19 May - 03 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 595€

Return flights