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

Return flights

01 May - 06 May	Air Premia	direct
01 May - 04 May	Air Premia	direct
04 May - 15 May	United	direct
03 May - 15 May	United	direct
03 May - 11 May	United	direct
03 May - 13 May	United	direct
03 May - 14 May	United	direct
04 May - 14 May	United	direct
06 May - 02 Jun	United	direct
01 May - 16 May	United	direct
02 May - 23 May	United	direct
18 May - 09 Jun	Philippine Airlines
25 May - 08 Jun	Flair Airlines
11 May - 05 Jun	WestJet
29 May - 10 Jun	WestJet
18 May - 20 Jun	WestJet
25 May - 01 Jun	WestJet
28 May - 11 Jun	WestJet
31 May - 14 Jun	WestJet
27 May - 10 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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from San Francisco to Seoul in May from $644

Return flights