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

Return flights

11 May - 26 May	Philippine Airlines
18 May - 01 Jun	Philippine Airlines
01 May - 09 May	Air Premia
11 May - 22 May	Philippine Airlines
04 May - 19 May	Air Premia
03 May - 19 May	Air Premia
04 May - 04 Jun	Air Premia
03 May - 09 May	Air Premia
03 May - 18 May	Air Canada
06 May - 13 May	Air Canada
06 May - 25 May	Air Canada
03 May - 30 May	Air Premia
05 May - 18 Jun	EVA Air
26 May - 02 Jun	WestJet
17 May - 02 Jun	EVA Air
19 May - 02 Jun	China Airlines
22 May - 10 Jun	WestJet
28 May - 02 Jun	WestJet
22 May - 05 Jun	WestJet
25 May - 06 Jun	WestJet

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 $758

Return flights