{ "response": { "Key": "ICN-SFO", "orig": { "code": "ICN", "type": "airport", "city": "Seoul", "fullCity": "Seoul, Korea", "airport": "Incheon Intl Airport" }, "dest": { "code": "SFO", "type": "airport", "city": "San Francisco", "fullCity": "San Francisco, California", "airport": "San Francisco Intl Airport" }, "faq": { "q0": { "question": "What is the typical flight duration from Seoul to San Francisco?", "answer": "A nonstop flight from Seoul (ICN) to San Francisco (SFO) typically takes about 10 hours 15 minutes to 10 hours 30 minutes. The return flight from San Francisco to Seoul is slightly longer, usually around 11 hours 30 minutes to 11 hours 50 minutes due to prevailing winds. With one stop, common layover cities include Tokyo or Los Angeles, and total travel time generally ranges from 13 to 16 hours." }, "q2": { "question": "Are there visa requirements to travel from Seoul to San Francisco?", "answer": "Yes, there are visa requirements. If you are a South Korean citizen traveling to San Francisco, you can visit the U.S. for up to 90 days without a visa under the Visa Waiver Program, but you must obtain an approved ESTA authorization before travel. If you are a U.S. citizen traveling from Seoul, you do not need a visa for South Korea for stays up to 90 days for tourism or business under the K-ETA program (effective from September 2021, though currently exempt for certain nationalities including U.S. until December 2024). Non-citizens of either country should check their specific nationality's visa requirements for both the U.S. and South Korea." }, "q3": { "question": "What are the ground transportation options in San Francisco?", "answer": "BART rapid rail is the fastest and most-used option from SFO to downtown San Francisco, with trains departing directly from the International Terminal. Ride-share services like Lyft and Uber pick up at the Domestic Garage, while taxis are available outside arrivals. Autonomous Waymo rides and rental cars are also accessible, plus hotel shuttles from designated zones.", "toolsUsed": [], "references": [ { "url": "https://flysfo.com/passengers/ground-transportation", "title": "Ground Transportation | San Francisco International Airport", "favicon": "https://flysfo.com/themes/custom/blueskies/favicon.ico", "time_published": "2026-04-08T21:19:40Z" }, { "url": "https://flysfo.com/de/node/10188", "title": "Ground Transportation | San Francisco International Airport", "favicon": "https://flysfo.com/themes/custom/blueskies/favicon.ico", "time_published": "2026-04-08T21:19:40Z" }, { "url": "https://en.wikipedia.org/wiki/SFO", "title": "San Francisco International Airport", "time_published": "2026-04-27T05:13:36Z" }, { "url": "https://en.wikipedia.org/wiki/San_Francisco_International_Airport", "title": "San Francisco International Airport", "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png", "time_published": "2026-07-18T07:52:09Z" }, { "url": "https://www.flysfo.com/pt-br", "title": "Home Page | San Francisco International Airport", "time_published": "2026-01-01T00:00:00Z" } ] }, "q4": { "question": "When is the cheapest time to fly from Seoul to San Francisco?", "answer": "The cheapest months to fly from Seoul to San Francisco are August and September, with average fares around $722–724, followed by November and October. The most expensive months are June, December, and May, where average prices climb above $990.", "methodology": "This 'good deal' estimate shows a representative best price for each departure date across roughly a 12-month window (about 3 months back and 9 months forward). It is built from real flight prices found by Priceline users searching this route, accumulated into a price history for each departure date. Rather than weighting all of that history equally, we apply exponential time decay so recent prices dominate — a price seen yesterday counts almost in full, one from about a month ago roughly a third, and prices from a few months back very little — giving a figure that tracks today's market instead of a stale long-run average. Clear price outliers are removed before any calculation, departure dates with no observations are filled in from nearby dates, and the resulting curve is lightly smoothed so it reads as a clean seasonal trend rather than day-to-day noise. For this route, fares for the requested travel direction were unavailable, so the pattern shown is derived from the reverse direction, which shares the same seasonal demand cycle.", "toolsUsed": [ "seasonal_prices" ] }, "q5": { "question": "How far in advance should I book tickets from Seoul to San Francisco?", "answer": "For the best fare from Seoul to San Francisco, book 8–11 weeks ahead — that window averages about $1,003, with the single cheapest day around 70 days out at $994. Prices rise sharply inside 4 weeks and climb above $1,100 more than 12 weeks out, so aim for that sweet spot; for peak summer or holidays, lean toward the earlier side of the range to avoid the steepest markups.", "methodology": "This booking-window guidance is built from the same real flight prices found by Priceline users searching this route, re-grouped by how many days before departure each price was seen (from the departure day out to about 180 days ahead) across the route's price history. At each booking lead time we report the 25th-percentile price — the cheaper end of what travelers were quoted, rather than the rock-bottom minimum (which can be a fluke) or the average (which is pulled up by expensive last-minute fares). The buy-or-wait advice then applies a risk premium that grows as departure approaches, since seat availability shrinks and prices become less predictable; using that adjusted curve we flag windows where waiting is likely to save a meaningful amount (at least $20 or 5%) versus windows where booking now is the better call. Isolated single-day recommendations are filtered out, so the advice only reflects a window that holds for several days in a row. For this route, fares for the requested travel direction were unavailable, so the pattern shown is derived from the reverse direction, which shares the same seasonal demand cycle.", "toolsUsed": [ "booking_timing" ] }, "q6": { "question": "Are overnight (red‑eye) flights available from Seoul to San Francisco?", "answer": "No overnight (red‑eye) flights operate from Seoul (ICN) to San Francisco (SFO) — neither nonstop red‑eyes nor connecting itineraries with a red‑eye long leg are available on this route.", "methodology": "Red-eye flights are identified from scheduled local departure and arrival times in our flight-schedule database — built from published airline timetables and official schedule data, including U.S. Department of Transportation records for domestic routes — flagging services that depart late at night and arrive the following morning; for connecting itineraries the red-eye is based on the timing of the overnight long-haul leg.", "toolsUsed": [ "redeye_flights" ] }, "q7": { "question": "Which airlines usually operate this route from Seoul to San Francisco?", "answer": "Nonstop flights from Seoul Incheon to San Francisco are operated by United Airlines, Asiana Airlines, Air Premia, and Korean Air. United offers the most frequent service with 35 weekly flights and a median fare around $889, making it the low-fare leader. Asiana flies 14 times per week, typically priced near $1,303, while Korean Air operates daily with a median fare of about $1,224. Air Premia runs 10 weekly flights on select days, with a median fare around $747.", "methodology": "Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours.", "toolsUsed": [ "route_airlines" ] }, "q8": { "question": "If I need a connection, what are common layover cities between Seoul and San Francisco?", "answer": "Common layovers include Tokyo, Seoul, Vancouver and Seattle, offering efficient transfers and broad connections. Tokyo and Seoul provide extensive Asian networks, while Vancouver and Seattle streamline entry into North America." }, "q9": { "question": "How reliable are on‑time departures on this route from Seoul to San Francisco?", "answer": "On‑time performance is typically good, though afternoon and evening flights may encounter occasional delays. Early departures on Korean Air and Asiana Airlines often have the best punctuality." }, "q10": { "question": "Which months have the best weather for traveling to San Francisco?", "answer": "September to November provides the warmest, sunniest weather with fewer tourists than summer months." }, "q11": { "question": "What documents should I bring with me to the airport when flying from Seoul to San Francisco?", "answer": "Bring a passport valid for at least six months, a valid U.S. visa or ESTA, proof of onward or return travel, a payment method for baggage, and any required vaccination certificates." }, "q12": { "question": "Which airport should I use in San Francisco?", "answer": "San Francisco International is the main airport for international flights to the Bay Area. Oakland and San Jose are secondary options about 20 miles and 45 miles from downtown San Francisco respectively, serving mostly domestic and low-cost carriers." }, "q13": { "question": "How do I get to Incheon Intl Airport from the city center?", "answer": "From Seoul city center, the fastest and most popular way to reach Incheon Airport is the AREX Airport Railroad express train, which takes about 43 minutes non-stop from Seoul Station. Comfortable airport limousine buses serve major districts like Gangnam and Dongdaemun with door-to-door convenience at a moderate cost. Taxis and ride‑share offer a direct door-to-door trip, though they are the most expensive and subject to traffic. Driving and parking at the airport is possible with both short-term and long-term lots, but it’s generally the least convenient given Seoul’s congestion.", "toolsUsed": [], "references": [ { "url": "https://airport.kr/bbs/ap_en/937/138233/artclView.do", "title": "K2Web Wizard", "time_published": "2024-10-16T00:00:00Z" }, { "url": "https://www.airport.kr/ap_en/1507/subview.do", "title": "International Incheon Airport" }, { "url": "https://en.wikipedia.org/wiki/Transportation_in_Seoul", "title": "Transportation in Seoul", "time_published": "2025-09-22T07:17:16Z" }, { "url": "https://en.wikipedia.org/wiki/Incheon%20International%20Airport%20Terminal%201%20station", "title": "Incheon International Airport Terminal 1 station", "time_published": "2026-03-08T09:10:35Z" }, { "url": "https://airport.kr/ap_en/6604/subview.do", "title": "International Incheon Airport" } ] }, "q14": { "question": "Are there hotels or sleeping facilities at San Francisco airport?", "answer": "San Francisco International Airport (SFO) has an on-site hotel, the Grand Hyatt at SFO, located directly at the airport with no shuttle required. Additionally, there are nearby hotels like the San Francisco Airport Marriott Waterfront and The Westin San Francisco Airport, both offering complimentary shuttle service to and from the terminals.", "toolsUsed": [], "references": [ { "url": "https://www.sleepinginairports.net/guides/san-francisco-airport-guide.htm", "title": "San Francisco Airport Guide (SFO) - Sleeping in Airports", "favicon": "https://www.sleepinginairports.net/nitropack_static/oBWrHkPujHTPIaVWqdDSDhClXUyrYhhb/assets/images/optimized/rev-b853180/www.sleepinginairports.net/wp-content/uploads/2018/09/cropped-sia-logo-180x180.png", "time_published": "2018-10-02T00:00:42Z" }, { "url": "https://www.marriott.com/en-us/hotels/sfobg-san-francisco-airport-marriott-waterfront/overview/?EM=DNM_SANFRANCISCOAIRPORTMARRIOTT.COM", "title": "SFO Airport Hotel | San Francisco Airport Marriott Waterfront", "time_published": "2025-02-19T00:00:00Z" }, { "url": "https://www.marriott.com/en-us/hotels/sfowi-the-westin-san-francisco-airport/overview/?scid=f2ae0541-1279-4f24-b197-a979c79310b0", "title": "The Westin San Francisco Airport (Official Site) - SFO Hotel", "time_published": "2025-02-19T00:00:00Z" }, { "url": "https://www.flysfo.com/passengers/shop-dine-relax?content_type=things_to_do&location=3&sort_by=random", "title": "Shop/Dine/Relax | San Francisco International Airport", "time_published": "2025-10-22T23:13:26Z" }, { "url": "https://www.flysfo.com/passengers/shop-dine-relax?content_type=All&gate_area=All&https://www.flysfo.com/passengers/shop-dine-relax?https://www_flysfo_com/passengers/shop-dine-relax?https://www_flysfo_com/passengers/shop-dine-relax?location=2&location=1659&security=All&service_tags=All&sort_by=random", "title": "Shop/Dine/Relax | San Francisco International Airport", "time_published": "2025-10-22T23:13:26Z" }, { "url": "http://www.flysfo.com/de/node/14691", "title": "Press Releases | San Francisco International Airport", "time_published": "2025-07-09T15:54:20Z" } ] }, "q15": { "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at San Francisco Intl Airport?", "answer": "San Francisco International Airport (SFO) provides currency exchange services in the International Terminal and throughout the terminals. There is a Reflection Room for quiet self-reflection and meditation, which includes a prayer room. Free Wi‑Fi is available across the airport.", "toolsUsed": [], "references": [ { "url": "https://flysfo.com/passengers/shop-dine-relax", "title": "Shop/Dine/Relax | San Francisco International Airport", "time_published": "2026-03-12T16:15:43Z" }, { "url": "http://www.flysfo.com/welcome-terminal-3", "title": "Welcome to Terminal 3 | San Francisco International Airport", "favicon": "http://www.flysfo.com/themes/custom/blueskies/favicon.ico", "time_published": "2026-05-08T21:34:33Z" }, { "url": "https://en.wikipedia.org/wiki/San_Francisco_International_Airport", "title": "San Francisco International Airport", "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png", "time_published": "2026-07-18T07:52:09Z" }, { "url": "https://en.wikipedia.org/wiki/San%20Francisco%20International%20Airport", "title": "San Francisco International Airport", "time_published": "2026-04-28T21:12:40Z" }, { "url": "https://flysfo.com/passengers/services-amenities", "title": "Services & Amenities | San Francisco International Airport", "favicon": "https://flysfo.com/themes/custom/blueskies/favicon.ico", "time_published": "2026-03-03T22:32:54Z" } ] }, "q17": { "question": "What aircraft are typically used on flights from Seoul to San Francisco?", "answer": "The most common aircraft on the nonstop Seoul–San Francisco route are the Boeing 787-9, flown by United, and the Airbus A350-900, flown by Asiana Airlines. On connecting itineraries, the Boeing 777-300ER (often via Taipei or Hong Kong) and the Boeing 787-9 (via Vancouver, Seattle, or Tokyo) appear most frequently on the long transpacific leg. The exact aircraft can vary by day and airline, but these widebody types dominate the route, and Wi‑Fi and seatback entertainment are widely available on these modern jets.", "methodology": "Aircraft types are taken from the equipment each operating carrier schedules on this route, drawn from published airline timetables and airline equipment schedules in our flight-schedule database. They describe typical scheduled aircraft and can vary with seasonal or day-of-week assignments and last-minute equipment swaps.", "toolsUsed": [ "route_aircraft" ] }, "q18": { "question": "Which airline alliances serve flights from Seoul to San Francisco?", "answer": "Star Alliance and SkyTeam serve Seoul (ICN) to San Francisco (SFO) nonstop: United (UA) and Asiana (OZ) represent Star Alliance, while Korean Air (KE) represents SkyTeam. Air Premia (YP) also flies the route but belongs to no alliance.", "methodology": "Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours. Carrier service and weekly frequencies are summarized from our flight-schedule database, which draws on published airline timetables, U.S. government schedule data, and observed operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). Where available, on-time and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, and typical fares from the U.S. DOT Airline Origin and Destination Survey (DB1B), a quarterly 10% sample of tickets sold.", "toolsUsed": [ "route_airlines", "flight_schedule" ] }, "q20": { "question": "What are the best airport lounge options when departing from Seoul?", "answer": "At Seoul Incheon (ICN), Terminal 1 has three Asiana Airlines Business Class Lounges (East, Central, and West) for Asiana business and Star Alliance Gold passengers, plus MATINA Lounges near gates 11 and 43 and Sky Hub Lounges (East and West) that accept Priority Pass and day-pass guests. The Terminal 1 Concourse offers another Sky Hub Lounge near gate 115, while Terminal 2 houses a MATINA Lounge and a Sky Hub Lounge, along with a Delta Sky Club shared with Korean Air for eligible premium and elite travelers. The Asiana lounges feature Korean cuisine and shower suites, and the Sky Hub Lounges provide buffet dining and runway views.", "toolsUsed": [], "references": [ { "url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/ICN", "title": "American Express Lounges at Seoul Incheon International Airport | Amex US", "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png" }, { "url": "https://my.prioritypass.com/en-GB/lounges/south-korea/incheon-international", "title": "Incheon International Airport ICN Lounges - ICN Airport Guide and lounges. | Priority Pass", "time_published": "2024-11-05T00:00:00Z" }, { "url": "https://www.delta.com/us/en/airports/asia/seoul-sky-club-airport-map", "title": "Seoul Incheon (ICN) Airport Map & Lounges | Delta Air Lines", "time_published": "2023-01-01T00:00:00Z" }, { "url": "https://americanexpress.com/en-th/travel/lounges/the-platinum-card/ICN", "title": "American Express Lounges at Seoul Incheon International Airport | Amex TH", "time_published": "2026-05-03T00:00:00Z" }, { "url": "https://my.prioritypass.com:443/en-GB/lounges/south-korea/incheon-international/icn10-sky-hub-lounge", "title": "Sky Hub Lounge ICN AIRPORT Terminal 1 Concourse Seoul Incheon Intl | Priority Pass", "time_published": "2024-11-05T00:00:00Z" } ] }, "q21": { "question": "What is the baggage allowance on this route from Seoul to San Francisco?", "answer": "On the Seoul to San Francisco route, Basic Economy fares may not include a checked bag. Standard international economy typically includes one checked bag and a carry‑on, while premium cabins offer more generous allowances." }, "q22": { "question": "What cabin and seat options are typical from Seoul to San Francisco?", "answer": "Flights from Seoul to San Francisco typically offer Economy, Premium Economy, and flat‑bed Business class; First class is available on select flights." }, "q23": { "question": "Are same‑day changes or standby possible on this route?", "answer": "Policies vary by airline and fare; flexible and premium cabins often allow same‑day changes or standby, while basic economy typically does not." } } } }