{"response": {"Key": "IAD-ICN", "orig": {"code": "IAD", "type": "airport", "city": "Washington", "fullCity": "Washington, United States", "airport": "Washington Intl Airport"}, "dest": {"code": "ICN", "type": "airport", "city": "Seoul", "fullCity": "Seoul, Korea", "airport": "Incheon Intl Airport"}, "faq": {"q0": {"question": "What is the typical flight duration from Washington to Seoul?", "answer": "The flight from Washington Dulles to Seoul Incheon is about 6,940 miles and typically takes 15 hours and 25 minutes nonstop. The return leg is faster at 13 hours and 50 minutes, a difference of about an hour and a half 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 Washington to Seoul?", "answer": "Yes, Korean Air and Air Premia fly nonstop from Washington Dulles (IAD) to Seoul Incheon (ICN). Korean Air operates daily with up to four departures a day (around midday), while Air Premia flies four days a week — Mondays, Wednesdays, Fridays, and Sundays — with two midday departures on those days. Both carriers use Boeing 777-300ER aircraft on the route, and the flight takes roughly 15 hours and 25 minutes.", "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. 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. 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": ["route_airlines", "flight_schedule", "route_aircraft", "redeye_flights"]}, "q3": {"question": "What are the ground transportation options in Seoul?", "answer": "From Incheon Airport, the fastest and most popular way to reach central Seoul is the AREX express train, which takes about 43 minutes to Seoul Station and costs 8,000 won. A cheaper commuter train on the same line makes all stops and takes around 60–70 minutes. Limousine buses serve major hotels and districts like Gangnam and Dongdaemun, with fares of 17,000–18,000 won and travel times of 70–90 minutes. Taxis and ride‑share are available but are more expensive and subject to traffic. Car rentals are possible but generally not recommended for city-center trips due to congestion and parking challenges.", "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"}]}, "q4": {"question": "When is the cheapest time to fly from Washington to Seoul?", "answer": "The cheapest months to fly from Washington to Seoul 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.", "toolsUsed": ["seasonal_prices"]}, "q5": {"question": "How far in advance should I book tickets from Washington to Seoul?", "answer": "For flights from Washington, D.C. (IAD) to Seoul (ICN), the optimal booking window is roughly 7 to 10 weeks before departure, with average fares around $1,539. The absolute cheapest time to book is about 55 days out, where fares can dip to $1,529. Booking at the last minute (within a week) can push prices up to over $1,800, while booking more than 5 months ahead also tends to be pricier. This pattern generally holds, but for peak summer (June–August) and major holidays like Chuseok or Lunar New Year, you should add 2–4 weeks to the lead time to secure the best fare.", "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.", "toolsUsed": ["booking_timing"]}, "q6": {"question": "Are overnight (red‑eye) flights available from Washington to Seoul?", "answer": "There are no nonstop red-eye flights from Washington Dulles to Seoul Incheon, but connecting itineraries whose long leg is an overnight red-eye are available. For example, United offers a connection via San Francisco where the SFO–ICN leg departs at 11:55 PM and arrives at 4:20 AM (early hours), and Asiana offers similar overnight legs via San Francisco (departing 11:20 PM, arriving 4:05 AM) or Los Angeles (departing 11:00 PM, arriving 4:00 AM).", "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 Washington to Seoul?", "answer": "Korean Air and Air Premia both fly nonstop from Washington Dulles to Seoul Incheon. Korean Air operates up to 28 weekly flights with departures around midday, and the typical fare on this route is approximately $1,584. Air Premia adds 8 weekly flights on Mondays, Wednesdays, Fridays, and Sundays, also departing around midday.", "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 Washington and Seoul?", "answer": "Common layover cities include Tokyo (Narita or Haneda), Seoul (Incheon, if connecting from another Asian city), San Francisco, and Vancouver. Tokyo offers efficient transfers and broad connections to ICN. San Francisco provides a logical West Coast gateway with multiple daily flights. Vancouver is a compact, efficient hub with US preclearance on the return, and transit without a Canadian visa is possible for many nationalities."}, "q10": {"question": "Which months have the best weather for traveling to Seoul?", "answer": "April to June and September to October offer mild temperatures, low rainfall, and smaller crowds than peak summer."}, "q11": {"question": "What documents should I bring with me to the airport when flying from Washington to Seoul?", "answer": "Bring a passport valid for at least six months, a K‑ETA or visa, proof of onward or return travel, and a payment method for baggage and any required health documents."}, "q12": {"question": "Which airport should I use in Seoul?", "answer": "Incheon is Seoul's main international airport, handling virtually all long‑haul flights. Gimpo serves domestic and a few regional routes and is closer to the city centre."}, "q13": {"question": "How do I get to Washington Intl Airport from the city center?", "answer": "From downtown Washington, D.C., the fastest and most convenient way to reach Washington Dulles International Airport (IAD) is typically by taxi, ride‑share, or driving, taking 35‑50 minutes depending on traffic. Taxis operated by Washington Flyer are available 24/7 at set fares, while Uber and Lyft offer app‑based pickup. A popular, lower‑cost public transit option is the Silver Line Express bus from the Wiehle‑Reston East Metro station, which connects to the Metrorail Silver Line; the combined trip takes about an hour and costs less than a taxi. Economy parking is available on‑site for $15 per day with a free shuttle to the terminal.", "toolsUsed": [], "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"}]}, "q14": {"question": "Are there hotels or sleeping facilities at Seoul airport?", "answer": "Seoul Incheon Airport (ICN) has the Incheon Airport Transit Hotel located on the 4th floor of Terminal 1, offering rooms in 6-hour blocks. There is also the ibis Styles Ambassador Incheon Airport nearby, connected by a shuttle. Both terminals have designated rest zones with reclining loungers and armrest-free benches for sleeping.", "toolsUsed": [], "references": [{"url": "https://www.sleepinginairports.net/guides/seoul-incheon-airport-guide.htm", "title": "Seoul Incheon Airport Guide (ICN) - 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.walkerhill.com/transithotel/customer/FAQ", "title": "Incheon Airport Transit Hotel", "time_published": "2022-06-13T00:00:00Z"}, {"url": "http://www.sleepinginairports.net/asia/seoul.htm", "title": "Seoul Incheon Airport Guide (ICN) - Sleeping in Airports", "time_published": "2026-04-13T17:34:21Z"}, {"url": "https://www.walkerhill.com/transithotel/en/t1/about/Introduction.jsp", "title": "Incheon Airport Transit Hotel", "time_published": "2022-06-13T00:00:00Z"}, {"url": "https://all.accor.com/a/en/destination/city/hotels-seoul-v5556.html", "title": "Hotels in Seoul | Accor ALL.com", "time_published": "2025-01-20T00:00:00Z"}, {"url": "https://www.walkerhill.com/transithotel/m/en/t1/about/Introduction.jsp", "title": "Incheon Airport Transit Hotel", "time_published": "2022-06-13T00:00:00Z"}]}, "q17": {"question": "What aircraft are typically used on flights from Washington to Seoul?", "answer": "The nonstop service between Washington Dulles and Seoul Incheon is typically operated with a Boeing 777-300ER by Korean Air. On connecting itineraries, the long-haul leg most often uses a Boeing 787-9 (via Toronto, San Francisco, Dallas/Fort Worth, or other hubs) or an Airbus A350-900 (via New York, Los Angeles, or San Francisco), with a smaller number of connections on a Boeing 777-200LR or Airbus A380-800. The exact aircraft can vary by day and airline, and most flights on this route offer Wi-Fi and seatback entertainment.", "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 Washington to Seoul?", "answer": "Korean Air (SkyTeam) and Air Premia fly nonstop from Washington Dulles to Seoul Incheon. Korean Air brings SkyTeam alliance connectivity, while Air Premia is an independent carrier with no global alliance affiliation. Other alliances may serve the route through one-stop itineraries.", "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", "article_lookup"]}, "q20": {"question": "What are the best airport lounge options when departing from Washington?", "answer": "At Washington Dulles (IAD), departing travelers have access to several lounges in Concourses A and B. In Concourse A, the Virgin Atlantic Clubhouse and the Etihad Airways Lounge (also operating as the Chase Sapphire Lounge by The Club) offer premium spaces, while the Air France / KLM Lounge is available from 7:30 AM to 9:00 PM but restricts entry between 3:00 PM and 8:00 PM. Concourse B houses the Turkish Airlines Lounge, though the Lufthansa Business and Senator Lounges there are temporarily closed. Additionally, the Capital One Lounge is located near the TSA PreCheck checkpoints before security and is open daily from 5:30 AM to 9:00 PM. Access to these lounges typically requires a same-day boarding pass for a qualifying flight, with eligibility often tied to business or first class tickets, elite status, or lounge membership programs.", "toolsUsed": [], "references": [{"url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/IAD", "title": "American Express Lounges at Washington Dulles International Airport | Amex US", "time_published": "2026-01-01T00:00:00Z"}, {"url": "https://prioritypass.com/en-GB/lounges/united-states-of-america/washington-dulles-international", "title": "Washington Dulles International Airport IAD Lounges - IAD Airport Guide and lounges.  | Priority Pass", "time_published": "2024-11-05T00:00:00Z"}, {"url": "https://americanexpress.com/en-th/travel/lounges/the-platinum-card/IAD", "title": "American Express Lounges at Washington Dulles International Airport | Amex TH", "time_published": "2026-01-01T00:00:00Z"}, {"url": "https://www.flydulles.com/travel-information/services-amenities/airport-lounges/capital-one-lounge-iad", "title": "Capital One Lounge - IAD | flydulles.com", "time_published": "2022-03-01T00:00:00Z"}, {"url": "https://my.prioritypass.com/zh-CN/lounges/united-states-of-america/washington-dulles-international/iad6-air-france-klm-lounge", "title": "Air France - KLM Lounge IAD AIRPORT A 大厅 杜勒斯国际机场 (Washington DC Dulles Intl) | Priority Pass", "time_published": "2024-11-05T00:00:00Z"}]}, "q21": {"question": "What is the baggage allowance on this route from Washington to Seoul?", "answer": "Baggage allowance on Washington–Seoul flights depends on the airline and fare class. Basic Economy often excludes checked luggage, while standard international economy usually includes one checked bag and a carry-on. Premium cabins and higher fares provide more generous allowances."}, "q22": {"question": "What cabin and seat options are typical from Washington to Seoul?", "answer": "Flights from Washington Dulles to Seoul Incheon typically offer Economy, Premium Economy, and flat-bed Business class on Korean Air and Asiana, with United also providing Economy and flat-bed Polaris Business."}, "q23": {"question": "Are same‑day changes or standby possible on this route?", "answer": "Policies differ by airline and fare class; flexible economy and premium cabins typically allow same‑day changes or standby, while Basic Economy usually does not."}}}}