{"response": {"Key": "ICN-IAD", "orig": {"code": "ICN", "type": "airport", "city": "Seoul", "fullCity": "Seoul, Korea", "airport": "Incheon Intl Airport"}, "dest": {"code": "IAD", "type": "airport", "city": "Washington", "fullCity": "Washington, United States", "airport": "Washington Intl Airport"}, "faq": {"q0": {"question": "What is the typical flight duration from Seoul to Washington?", "answer": "The flight from Seoul to Washington is about 6,940 miles and typically takes 13 hours and 50 minutes nonstop. The return flight is longer at 15 hours and 25 minutes, a difference of 1 hour and 35 minutes due to prevailing winds.", "methodology": "Carrier service, flight times and distances for this route come 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). We report the days of the week and the departure times each carrier operates. The typical flight time is the median scheduled block time, given both per carrier and across all carriers on the route; where a schedule does not publish an elapsed time, it is derived from the scheduled departure and arrival times converted to UTC. Outbound and return times are computed by the same method, so the difference between them is directly comparable and reflects prevailing winds rather than any change in derivation. Distance is the great-circle distance between the two specific airports named, so an actual flown track is typically 2-5% longer. Where shown, on-time departure and arrival rates and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, which covers U.S. domestic routes only; where a typical fare is shown, it comes from the U.S. DOT Airline Origin and Destination Survey (DB1B), a quarterly 10% sample of tickets sold.", "toolsUsed": ["flight_schedule"]}, "q1": {"question": "Are there any direct flights from Seoul to Washington?", "answer": "Yes, Korean Air and Air Premia both fly nonstop from Seoul Incheon to Washington Dulles. Korean Air runs twice daily, every day of the week, while Air Premia operates four times a week on Mondays, Wednesdays, Fridays, and Sundays. The flight takes about 13 hours and 50 minutes eastbound.", "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, flight times and distances for this route come 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). We report the days of the week and the departure times each carrier operates. The typical flight time is the median scheduled block time, given both per carrier and across all carriers on the route; where a schedule does not publish an elapsed time, it is derived from the scheduled departure and arrival times converted to UTC. Outbound and return times are computed by the same method, so the difference between them is directly comparable and reflects prevailing winds rather than any change in derivation. Distance is the great-circle distance between the two specific airports named, so an actual flown track is typically 2-5% longer. Where shown, on-time departure and arrival rates and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, which covers U.S. domestic routes only; where a typical fare is shown, it comes from the U.S. DOT Airline Origin and Destination Survey (DB1B), a quarterly 10% sample of tickets sold.", "toolsUsed": ["route_airlines", "flight_schedule"]}, "q3": {"question": "What are the ground transportation options in Washington?", "answer": "At Washington Dulles (IAD), the Silver Line Metrorail is the most-used and fastest option into downtown DC — take the Silver Line Express bus to the Wiehle-Reston East station, then transfer to the train. Taxis (Washington Flyer) and ride-share services like Uber and Lyft are also readily available for a direct, door-to-door trip, while shared vans offer a budget-friendly alternative. Rental cars are convenient for exploring beyond the city, with major agencies on-site. The Metrorail is generally the most popular choice for its reliability and cost-effectiveness, though the journey involves a bus-to-rail transfer.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://flydulles.com/flight-schedule-dulles-international-airport-iad", "title": "flydulles.com - Flight Schedule - Dulles International Airport (IAD)", "time_published": "2022-03-01T00:00:00Z"}, {"url": "https://parking.flydulles.com/economy-parking", "title": "Dulles International Airport Parking | Economy Parking", "time_published": "2026-02-06T00:00:00Z"}, {"url": "https://www.mwaa.com/ipw-2017-archived", "title": "IPW 2017 - Archived", "time_published": "2021-02-01T00:00:00Z"}, {"url": "https://www.mwaa.com/policefireems/fire-ems/fire-ems-washington-dulles-international-airport", "title": "mwaa.com - Fire & EMS at Washington Dulles International Airport", "favicon": "https://www.mwaa.com/themes/custom/mwaa_barrio/favicon.ico", "time_published": "2023-09-01T00:00:00Z"}, {"url": "https://en.wikipedia.org/wiki/Dulles%20International%20Airport", "title": "Dulles International Airport", "time_published": "2026-04-30T14:07:38Z"}]}, "q4": {"question": "When is the cheapest time to fly from Seoul to Washington?", "answer": "The cheapest months to fly from Seoul to Washington are September, October, and November, with average fares around $1,136 to $1,205, while June, December, and May are the most expensive, averaging $1,557 to $1,691.", "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 Washington?", "answer": "For flights from Seoul to Washington, the optimal booking window is 7 to 10 weeks before departure, with average fares around $1,539. The single cheapest day to book is about 55 days out at $1,529, while last-minute bookings can exceed $1,800. During peak summer and holiday periods, you'll want to book on the earlier side of that range—closer to 10 weeks out—to avoid steeper price hikes.", "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 Washington?", "answer": "No nonstop red‑eye flights operate from Seoul (ICN) to Washington (IAD). Connecting itineraries whose long leg is an overnight flight are available via New York JFK: Asiana Airlines (OZ) departs ICN at 21:05 and arrives at JFK at 23:00 the same night, then connects to American, Delta, or United for the short hop to IAD after a layover of roughly 7–7½ hours.", "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 Washington?", "answer": "Korean Air and Air Premia operate nonstop flights from Seoul Incheon to Washington Dulles. Korean Air runs twice-daily service, with median fares around $1,642, while Air Premia flies four times a week on Monday, Wednesday, Friday, and Sunday, with median fares around $1,317. Both carriers offer direct connections between the two capitals.", "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 Washington?", "answer": "Common layovers include Tokyo, San Francisco, Los Angeles, and Chicago, which offer broad connections and efficient transfers while keeping total travel time competitive."}, "q10": {"question": "Which months have the best weather for traveling to Washington?", "answer": "April to May and September to October offer pleasant temperatures and fewer tourists than summer."}, "q11": {"question": "What documents should I bring with me to the airport when flying from Seoul to Washington?", "answer": "Carry a passport valid for at least six months, a valid U.S. visa or ESTA authorization, proof of onward travel, payment for baggage, and any required vaccination certificates."}, "q12": {"question": "Which airport should I use in Washington?", "answer": "Washington Dulles is the main international gateway, located 26 miles west of downtown. Ronald Reagan Washington National is closer to the city centre and the National Mall but handles mostly domestic flights with limited international service. Baltimore/Washington International is farther north, offering a mix of domestic and international flights often with lower fares."}, "q13": {"question": "How do I get to Incheon Intl Airport from the city center?", "answer": "From downtown Seoul, the fastest and most popular way to reach Incheon Airport is the AREX Airport Railroad express train, which takes about 43–51 minutes nonstop from Seoul Station. Airport limousine buses are a comfortable alternative, serving major districts like Gangnam and Dongdaemun with fares around ₩17,000–18,000. Taxis and ride‑share offer door‑to‑door convenience but at a higher cost, while driving yourself means paid parking at the airport. The AREX express train is generally the quickest option, while the limousine bus is favored for its direct service to specific neighborhoods.", "toolsUsed": ["article_lookup"], "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 Washington airport?", "answer": "Washington Dulles Airport (IAD) has a Sleepbox Lounge airside with 16 sound-proof rooms, though there are no capsule hotels or sleeping pods in the terminals. The on-site Washington Dulles Airport Marriott is connected by a free shuttle that runs every 15 minutes. Several other nearby hotels also offer shuttle service for a full overnight stay.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://sleepinginairports.net/guides/washington-dulles-airport-guide.htm", "title": "Washington Dulles Airport Guide (IAD) - 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": "2018-08-08T21:11:21Z"}, {"url": "https://www.sleepinginairports.net/sleep-guide/sleeping-in-washington-dulles-airport.htm", "title": "Sleeping in Washington Dulles Airport", "time_published": "2024-09-12T00:00:00Z"}, {"url": "https://www.marriott.com/en-us/hotels/iadap-washington-dulles-airport-marriott/overview/?scid=d2406702-e8ea-4b45-bb9b-69", "title": "Hotel near IAD Airport | Washington Dulles Airport Marriott", "time_published": "2025-02-19T00:00:00Z"}, {"url": "https://www.marriott.com/en-us/hotels/iadap-washington-dulles-airport-marriott/overview/?scid=f2ae0541-1279-4f24-b197-a979c79310b0", "title": "Hotel near IAD Airport | Washington Dulles Airport Marriott", "time_published": "2024-10-11T00:00:00Z"}, {"url": "https://www.flydulles.com/", "title": "Official Website of Washington Dulles International Airport - IAD", "favicon": "https://www.flydulles.com/themes/custom/mwaa_barrio/favicon.ico", "time_published": "2026-07-17T00:00:00Z"}, {"url": "https://www.airportsdata.net/airport-IAD-accommodation/", "title": "Sleeping at Dulles airport - Washington D.C.", "time_published": "2025-12-01T00:00:00Z"}]}, "q17": {"question": "What aircraft are typically used on flights from Seoul to Washington?", "answer": "There is no nonstop service between Seoul Incheon (ICN) and Washington Dulles (IAD), so all flights connect. The most common aircraft on the long-haul leg are the Boeing 787-9 and Airbus A350-900, with the Boeing 787-9 appearing most frequently via hubs like Dallas, San Francisco, Toronto, and Montreal. A few itineraries also use the Airbus A380-800 (via New York JFK) or Boeing 777 (via Tokyo). The exact aircraft can vary by day and airline, but these widebody types dominate the route. Onboard, 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"]}, "q20": {"question": "What are the best airport lounge options when departing from Seoul?", "answer": "At Seoul Incheon, Asiana Airlines operates three Business Class Lounges in Terminal 1 (East, Central, and West), accessible to Asiana business and first class passengers and Star Alliance Gold members, with comfortable seating and shower facilities. Terminal 1 also has MATINA Lounges near Gates 11 and 43 and Sky Hub Lounges (East, West, and Concourse), which accept Priority Pass and offer self-serve buffets and bar service. In Terminal 2, where Delta and Korean Air are based, you'll find a MATINA Lounge and multiple Sky Hub Lounges, plus a Delta Sky Club for eligible Delta premium cabin and elite flyers.", "toolsUsed": ["article_lookup"], "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 Washington?", "answer": "On Seoul–Washington flights, Basic Economy fares may not include a checked bag. Standard international economy typically includes one checked bag and a carry‑on, while premium cabins allow more. Always confirm with your airline."}, "q22": {"question": "What cabin and seat options are typical from Seoul to Washington?", "answer": "Nonstop flights from Seoul to Washington typically offer Economy, Premium Economy, and flat-bed Business class. First class is not available on this route."}, "q23": {"question": "Are same‑day changes or standby possible on this route?", "answer": "Policies differ by airline and fare class; flexible and premium cabin tickets often allow same‑day changes or standby, while restrictive economy fares typically do not."}}}}