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

Return flights

13 May - 27 May	WestJet
24 May - 31 May	WestJet
11 May - 16 May	Cathay Pacific
20 May - 04 Jun	WestJet
30 May - 13 Jun	WestJet
22 May - 07 Jun	WestJet
17 May - 24 May	WestJet
13 May - 27 May	Air Premia	direct
17 May - 24 May	Air Premia	direct
22 May - 07 Jun	Air Premia	direct
11 May - 16 May	Asiana Airlines	direct
24 May - 31 May	Air Premia	direct
20 May - 04 Jun	Delta	direct
30 May - 13 Jun	Delta	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 $752

Return flights