{
  "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": "A nonstop flight from Seoul (ICN) to Washington Dulles (IAD) typically takes about 13 hours 30–40 minutes. With one stop, common layover cities include Tokyo or San Francisco, bringing total travel time to roughly 15–18 hours. The return flight from Washington to Seoul is often slightly faster, averaging around 13 hours 10–20 minutes due to prevailing wind patterns."
      },
      "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 operates two daily flights, while Air Premia flies four times a week on Mondays, Wednesdays, Fridays, and Sundays. Together they offer up to 18 weekly nonstops on the route.",
        "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"
        ]
      },
      "q2": {
        "question": "Are there visa requirements to travel from Seoul to Washington?",
        "answer": "Yes, there are visa requirements for travel from Seoul to Washington. If you are a South Korean citizen, you can travel to the United States for short visits without a visa under the Visa Waiver Program, but you must obtain an approved ESTA authorization in advance. If you are a U.S. citizen, you do not need a visa to enter South Korea for stays up to 90 days for tourism or business; however, as of September 2021, you must apply for a K-ETA (Korea Electronic Travel Authorization) before travel. For citizens of other countries, check both U.S. and South Korean entry requirements based on your nationality."
      },
      "q3": {
        "question": "What are the ground transportation options in Washington?",
        "answer": "From Washington Dulles (IAD), the most used and fastest option to downtown DC is the Metrorail Silver Line, reached via a $5 Silver Line Express bus from arrivals to the Wiehle-Reston East station. Taxis (Washington Flyer) are available 24/7 at curbside, and ride‑share services like Uber and Lyft also pick up at the terminal. Shared‑van shuttles (SuperShuttle, Supreme Shuttle) provide group rides, and rental cars are available on‑site. The Silver Line train is the most popular choice for its reliability and cost, while a taxi or ride‑share is quickest door‑to‑door.",
        "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"
          }
        ]
      },
      "q4": {
        "question": "When is the cheapest time to fly from Seoul to Washington?",
        "answer": "The cheapest time to fly from Seoul to Washington is late summer through fall, with the lowest fares in September, October, and November. June, December, and May are the most expensive months, with average prices rising above $1,550.",
        "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 the Seoul to Washington route, the optimal booking window is 7 to 10 weeks before departure, with an average fare of $1,557. Booking around 60 days out can yield the lowest prices near $1,547, while last-minute tickets can exceed $1,800. During peak summer and holiday periods, demand typically pushes fares higher, so aiming for the earlier end of that window or even a bit further out is advisable.",
        "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": "There are no nonstop red‑eye flights from Seoul Incheon to Washington Dulles, but one‑stop itineraries whose long leg is an overnight red‑eye do operate. For example, KLM offers a connection via Amsterdam: the overnight leg departs ICN at 22:25 and arrives at AMS at 05:10, landing in the early hours of the next morning.",
        "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"
        ]
      },
      "q8": {
        "question": "If I need a connection, what are common layover cities between Seoul and Washington?",
        "answer": "Common layovers include Tokyo (Narita), San Francisco, Los Angeles, and Toronto, which keep total travel time competitive. Tokyo offers efficient connections via major Asian carriers. San Francisco and Los Angeles allow for streamlined U.S. entry before your onward domestic flight. Toronto provides a visa-free transit option for eligible passengers, bypassing U.S. preclearance congestion."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Seoul to Washington?",
        "answer": "On‑time performance is generally reliable, but afternoon departures may face minor delays. Early flights on Korean Air often have better punctuality."
      },
      "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."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Seoul to Washington?",
        "answer": "Bring a passport valid for at least six months beyond your stay, a valid U.S. visa or ESTA authorization, proof of onward or return travel, a payment method for baggage, and any required vaccination certificates."
      },
      "q12": {
        "question": "Which airport should I use in Washington?",
        "answer": "Washington Dulles is the primary international gateway with United as a major hub and good Star Alliance connections. Ronald Reagan National is closer to downtown and the National Mall but mainly serves domestic routes. Baltimore/Washington offers Southwest and low‑cost options but is farther away."
      },
      "q13": {
        "question": "How do I get to Incheon Intl Airport from the city center?",
        "answer": "From downtown Seoul, the AREX Airport Railroad express train is the fastest option, reaching Incheon Airport in about 45–50 minutes from Seoul Station, while the all-stop commuter train is cheaper but takes longer. Airport limousine buses serve many city districts and hotels with direct door-to-door convenience, costing roughly the same as the express train; taxis and ride‑share are widely available but are the most expensive choice. Driving yourself is possible with ample parking at the airport, though traffic can be heavy. Most travelers prefer the AREX express for its speed and reliability.",
        "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 Washington airport?",
        "answer": "Washington Dulles Airport has the Sleepbox Lounge airside with 16 soundproof rooms for rest, but there are no traditional on-site hotels or capsule hotels inside the terminal. The Washington Dulles Airport Marriott is on airport grounds and offers a free shuttle every 15 minutes, while several other nearby hotels also provide shuttle service.",
        "toolsUsed": [],
        "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 from Seoul (ICN) to Washington Dulles (IAD), so all flights connect. The most common long-haul aircraft on the trans-Pacific leg is the Boeing 787-9, operated by American (via Dallas/Fort Worth), United (via San Francisco), Air Canada (via Toronto), and several other carriers. The Airbus A350-900 also appears on Korean Air connecting itineraries via Los Angeles, and Boeing 777 variants show up on Qatar Airways connections via Doha. On the shorter domestic connecting legs into Dulles, you'll typically see Airbus A320 family jets, Boeing 737 variants, or regional aircraft like the Embraer 175 and CRJ-900. Wi-Fi and seatback entertainment are widely available on these long-haul aircraft, though the exact features depend on the airline and specific aircraft configuration.",
        "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 Washington?",
        "answer": "Korean Air (SkyTeam) and Air Premia (unaffiliated) are the two carriers flying nonstop from Seoul Incheon to Washington Dulles. Air Premia is a hybrid airline that does not belong to any major global alliance, so SkyTeam is the only alliance with a nonstop presence on this route; other alliances may serve it via connections.",
        "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"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Seoul?",
        "answer": "Incheon Airport has three Asiana Airlines Business Class Lounges — East, Central, and West — all in Terminal 1, accessible to Asiana business/first-class passengers and Star Alliance Gold members, with the Central lounge offering a notably spacious layout and Korean cuisine. Terminal 2 houses the Korean Air Prestige Class Lounges (not listed here but well-established as the main SkyTeam option), while independent lounges include several Sky Hub Lounges across both terminals and the MATINA Lounges in Terminal 1 (Gates 11 and 43) and Terminal 2, which accept Priority Pass and offer showers and buffet dining. The Sky Hub Lounge in the Terminal 1 Concourse, open 6:00 AM to 10:00 PM, is a popular airside retreat with complimentary Wi-Fi, hot meals, and a full bar.",
        "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 Washington?",
        "answer": "Baggage allowance on Seoul–Washington flights depends on the airline and fare class. Basic economy fares are restrictive and 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 Washington?",
        "answer": "On Seoul to Washington flights, you can expect Economy, often Premium Economy, and flat-bed Business class; First class is extremely rare on this route."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies vary by airline and fare; flexible and premium cabin tickets often allow same‑day changes or standby, but restrictions apply to lower fares."
      }
    }
  }
}