San Francisco to Seoul flights (SFO to ICN): cheapest fares

Cheapest San Francisco to Seoul flights by price, the ~12 h 35 min nonstop flight time and the cheapest month to fly. Then let KBW plan your Seoul stay and clinic on WhatsApp.

from $352 · one-wayFlight time 13 hCheapest in January 2027

FromSan FranciscoSFOToSeoulICN · GMP

1 adult

Depart—

ReturnOne-way

Price calendar

November 2026

Tap your departure day · one-way, per person

MTWTFSS

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Cheapest month to fly

Lowest one-way fare found for each month · tap a month

Lowest fare per day · November 2026

$357one-way · per personSelect ›
$494one-way · per personSelect ›
$530one-way · per personSelect ›
$543one-way · per personSelect ›

Prices as of Nov 2, 2026 (cached fares). The price may change at booking. Fares from Aviasales; book on Aviasales or Kiwi.com (our partners, prices in your currency). KBW may earn a commission at no extra cost to you.

San Francisco → Seoul · dates not decided yet · 1 adult

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Route facts

Flight time: about 13 h direct
Airports: San Francisco (SFO) (SFO) → Seoul Incheon (ICN)
Airlines with fares: Air Premia, United, Frontier, F8, Alaska Airlines

KBW tips for this route

1Cheapest month right now: January 2027, from $352 one-way. For holiday dates (Lunar New Year, Chuseok, Christmas) book 2–3 months ahead; otherwise 4–8 weeks before departure is usually the sweet spot.
2You land at Incheon (ICN). Central Seoul is about 1 hour away: AREX express to Seoul Station (43 min), the all-stop AREX to Hongdae, or a limousine bus straight to hotels in Gangnam and Myeongdong.
3Coming for a clinic? Book the consultation for your first full day and keep the last day free. Ask the clinic how many days to stay before flying home after a treatment — our treatment guides list it too.
4Once the flight is set, KBW books the rest in your language on WhatsApp: stays, clinic appointments, restaurants and tours.

Plan the rest of your trip

Stays in Seoul›Clinics›Tours in Seoul›Treatments›

Frequently asked questions

How long is the flight from San Francisco to Seoul?+

A direct flight takes about 13 h. Check-in, immigration and the trip into the city add 2–3 hours, so plan the first evening light.

When is the cheapest time to fly from San Francisco to Seoul?+

Right now January 2027 is the cheapest month, from $352 one-way (fares as of Nov 2, 2026). Mid-week departures are usually cheaper than Fridays and weekends.

Should I fly into Incheon (ICN) or Gimpo (GMP)?+

Incheon has more flights and usually the lowest fares; Gimpo is much closer to the city (about 30 minutes by subway). If the prices are close, Gimpo saves you an hour on each end.

Which airlines fly from San Francisco to Seoul?+

The fares we found are on Air Premia, United, Frontier, F8, Alaska Airlines. The live search on Aviasales shows every airline and agency for your dates.

Can KBW book my hotel, clinic or tours in Korea?+

Yes. Book your flight on Aviasales, then message KBW on WhatsApp with your dates. We book stays, clinic consultations and tours in your language; partner clinics and stays come with member benefits.