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	Alaska Airlines
18 May - 25 May	Philippine Airlines
08 May - 17 May	Alaska Airlines
06 May - 18 May	Cathay Pacific
08 May - 13 May	Alaska Airlines
31 May - 03 Jun	WestJet
30 May - 03 Jun	WestJet
06 May - 25 May	Vietnam Airlines
16 May - 30 May	Alaska Airlines
23 May - 07 Jun	WestJet
20 May - 07 Jun	WestJet
27 May - 24 Jun	Cathay Pacific
06 May - 18 May	Air Premia	direct
31 May - 30 Jun	WestJet
08 May - 17 May	Air Premia	direct
08 May - 13 May	Air Premia	direct
28 May - 18 Jun	Air Canada
28 May - 25 Jun	Air Canada
20 May - 07 Jun	Air Premia	direct
27 May - 24 Jun	Air Premia	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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from San Francisco to Seoul in May from 559€

Return flights