Flights from San Francisco to Seoul

Flight time is typically around 11.5 hours in the air for a nonstop; one-stop itineraries take longer including the connection.

The great-circle distance is roughly 9,085 km (5,642 miles).

Yes — American Airlines, Asiana Airlines, Korean Air and others fly this pair nonstop in the reference schedule data. Schedules change seasonally, so the live search confirms today's options.

Incheon International Airport (ICN). Searching by city covers all of them at once.

Compare midweek dates, check nearby departure airports, and book international trips a few months ahead. The search above shows current fares from our booking partners.

long-haul trips like this are most often cheapest when booked around two to four months out — and at their most expensive inside the last two weeks. These are booking windows, not rules — fares change constantly, so compare dates in the search above and book when the total, bags included, is right.

The cheapest month depends on the demand calendar at Seoul — school holidays, the Christmas–New Year peak and major local events price highest, and shoulder-season months between them price lowest. Rather than trusting a generic answer, open the fare calendar on the search above: it shows real prices for every date this month and next, so the cheap windows are visible immediately.

Midweek departures — Tuesday to Thursday — commonly price below Friday–Sunday on routes like San Francisco → Seoul, because leisure demand concentrates at the weekend. The pattern is not guaranteed on every date, so compare a midweek date against your first-choice day in the search above before locking in.

AREX express to Seoul. 43–51 min; luggage trolleys ride the train. FlyraGo’s Seoul airport transfer guide compares fixed-price cars, taxis and public transport for this airport.

It depends on your nationality, not on the route — two travellers on the same San Francisco → Seoul flight can face completely different entry rules. Check the destination country’s official immigration site or your foreign-ministry travel advice for your passport, and do it before booking: some destinations require a visa obtained in advance, others issue visas or waivers on arrival.

Whatever the fare you buy includes — baggage is set by the carrier and fare class, not the route, and the carriers on this pair (American Airlines, Asiana Airlines, Korean Air, Singapore Airlines and others) price bags very differently. Low-cost fares usually include cabin bags only and charge per checked bag; full-service fares typically include at least one. Compare totals with your bags added, because a dearer fare with bags included is often cheaper overall.

Seoul has a left-luggage network — the KTX-to-Busan morning leaves early — storage at Seoul Station makes the same-day trip work FlyraGo’s Seoul luggage storage page lists the network, with flat daily rates you can book before you fly.

Roughly 11.5 hours in the air is a genuine endurance event, and three choices decide most of it: pick your seat when booking (aisle for freedom, window for sleep), decide your sleep strategy before boarding rather than halfway through, and book your Seoul transfer in advance so the arrival half of the journey is already solved when you land, tired.