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

Return flights

18 May - 25 May	Flair Airlines
05 May - 12 May	Cathay Pacific
11 May - 26 May	Cathay Pacific
07 May - 19 May	Cathay Pacific
27 May - 03 Jun	WestJet
20 May - 31 May	WestJet
14 May - 07 Jun	WestJet
20 May - 03 Jun	WestJet
14 May - 25 May	WestJet
19 May - 07 Jun	Alaska Airlines
20 May - 07 Jun	Alaska Airlines
14 May - 30 May	WestJet
08 May - 17 May	Flair Airlines
20 May - 25 Jun	Air Canada
15 May - 30 May	WestJet
22 May - 05 Jun	WestJet
25 May - 06 Jun	WestJet
28 May - 08 Jun	Cathay Pacific
05 May - 27 May	Alaska Airlines
05 May - 18 Jun	EVA Air

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 703€

Return flights