{
  "response": {
    "Key": "IAD-SEL",
    "orig": {
      "code": "IAD",
      "type": "airport",
      "city": "Washington D.C.",
      "fullCity": "Washington D.C., United States",
      "airport": "Washington Intl Airport"
    },
    "dest": {
      "code": "SEL",
      "type": "airport",
      "city": "Seoul",
      "fullCity": "Seoul, Korea",
      "airport": "Incheon Intl Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Washington D.C. to Seoul?",
        "answer": "A nonstop flight from Washington Dulles (IAD) to Seoul Incheon (ICN) typically takes about 14 hours 30 minutes to 15 hours. With one stop, common layovers like Tokyo Narita or San Francisco bring total travel time to around 17 to 19 hours. The return nonstop is slightly shorter, often around 13 hours 30 minutes to 14 hours. Korean Air and Asiana generally offer the fastest nonstop service."
      },
      "q1": {
        "question": "Are there any direct flights from Washington D.C. to Seoul?",
        "answer": "Yes, there are direct nonstop flights from Washington Dulles (IAD) to Seoul Incheon (ICN) on two airlines: Korean Air (KE) operates daily with up to four departures per day, while Air Premia (YP) flies four times a week on Mondays, Wednesdays, Fridays, and Sundays with two departures on those days.",
        "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. 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 Washington D.C. to Seoul?",
        "answer": "Yes, visa requirements apply for travel from Washington D.C. to Seoul. U.S. citizens can enter South Korea visa-free for tourism or short visits for up to 90 days under the K-ETA (Korea Electronic Travel Authorization) program; you must obtain K-ETA approval before boarding. South Korean nationals do not need a visa to return home. Nationals of other countries should check if they require a visa or are eligible for K-ETA. For the return from Seoul to Washington D.C., South Korean nationals can travel visa-free under the U.S. Visa Waiver Program with an approved ESTA, while U.S. citizens do not need a visa to return home."
      },
      "q3": {
        "question": "What are the ground transportation options in Seoul?",
        "answer": "Seoul has two main airports: Incheon International (ICN) and Gimpo International (GMP). From Incheon, the AREX Express train reaches Seoul Station in about forty-three minutes non-stop, while the All-Stop train takes around sixty minutes and is cheaper. Airport limousine buses serve major districts and hotels in sixty to ninety minutes, offering comfort but subject to traffic. Taxis and ride-share services like Kakao T are available, with a ride to central Seoul taking sixty to ninety minutes and costing significantly more. Car rentals are possible but not recommended for city travel due to heavy traffic and limited parking. From Gimpo, the AREX All-Stop train connects to Seoul Station in about twenty-five minutes, and subway lines 5 and 9 provide additional access. Taxis and buses are also viable. Most travelers from Incheon use the AREX Express for its speed and reliability, while from Gimpo the subway is most common."
      },
      "q4": {
        "question": "When is the cheapest time to fly from Washington D.C. to Seoul?",
        "answer": "Based on seasonal price data for flights from Washington D.C. (IAD) to Seoul (SEL), the cheapest months to fly are September (around $1229), October ($1334), and August ($1354), while the most expensive are December (around $1847), June ($1702), and July ($1612).",
        "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 D.C. to Seoul?",
        "answer": "For flights from Washington D.C. (IAD) to Seoul (SEL), the optimal booking window is roughly 23 to 26 weeks before departure, with average fares around $1,578. Booking around 180 days out can yield the lowest prices near $1,556, while last-minute bookings are pricier at about $1,781. During peak summer and holiday periods, it's wise to book even earlier, as prices tend to rise closer to departure.",
        "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 D.C. to Seoul?",
        "answer": "There are no nonstop red-eye flights from Washington Dulles (IAD) to Seoul (SEL), but one-stop itineraries with an overnight long leg are available — for example, connecting via San Francisco (SFO) where the SFO–ICN leg departs around 11:20–11:55 PM and arrives in Seoul around 4:05–4:20 AM, operated by United or Asiana.",
        "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 Washington D.C. and Seoul?",
        "answer": "Common layover cities include Tokyo (Narita or Haneda), Incheon (Seoul's main airport often serves as a hub for connecting flights, though you asked for layovers before Seoul), Beijing, and Shanghai. Tokyo offers efficient connections and a single terminal for many transfers. Beijing and Shanghai provide broad networks and competitive total travel times. Note that visa-free transit is available in China for many nationalities, and Japan allows visa-free entry for numerous passport holders. If you're flying Korean Air or Asiana, Incheon itself is a major hub with excellent transfer facilities, but for a layover before Seoul, consider Tokyo, Beijing, or Shanghai."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Washington D.C. to Seoul?",
        "answer": "Departures are generally reliable, but afternoon and evening flights can encounter delays due to airport congestion. Early flights, particularly on Korean Air, tend to have better on-time performance."
      },
      "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 fewer tourists than peak summer."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Washington D.C. to Seoul?",
        "answer": "Bring a passport valid for at least six months beyond your stay, a K-ETA or visa if required, proof of onward travel, and a payment method for baggage. Vaccination certificates are no longer mandatory but check latest health advisories."
      },
      "q12": {
        "question": "Which airport should I use in Seoul?",
        "answer": "Incheon is the primary international gateway, about an hour west of downtown, hosting most full‑service carriers and alliances. Gimpo is closer to the city centre and mainly serves domestic and short‑haul regional flights."
      },
      "q13": {
        "question": "How do I get to Washington Intl Airport from the city center?",
        "answer": "The Silver Line Express bus from Wiehle-Reston East Metro station is the main public transit option, taking about 15 min from the station. Metro from downtown to the station takes about 40 min. Rideshares and taxis are faster door-to-door but cost more. Driving and parking are available but expensive."
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at Seoul airport?",
        "answer": "Yes. Incheon Airport has an on-site transit hotel inside Terminal 1 (airside) and Terminal 2, plus a capsule hotel called Darakhyu in Terminal 1 (landside). No shuttle is required for these. Additional nearby hotels offer free shuttle service."
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Incheon Intl Airport?",
        "answer": "Yes. Incheon International Airport has currency exchange kiosks in both terminals, multi‑faith prayer rooms in Terminal 1 (near Gate 27) and Terminal 2 (near Gate 232), and free Wi‑Fi throughout the airport."
      },
      "q16": {
        "question": "Are there accessible services or children's facilities at the Washington D.C. and Seoul airports?",
        "answer": "Washington Dulles offers wheelchair assistance and accessible restrooms; request help through your airline 48 hours before travel. It has a children's play area in Concourse B. Seoul Incheon provides free wheelchair rental, accessible restrooms, and a dedicated assistance desk; book assistance in advance via airline. Kids zones are located in Terminals 1 and 2."
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Washington D.C. to Seoul?",
        "answer": "There is no nonstop service from Washington Dulles (IAD) to Seoul (SEL); the most common connecting aircraft on the long-haul leg are the Boeing 787-9 (via Toronto, Dallas/Fort Worth, San Francisco, or Montreal on Air Canada, American, and United), the Airbus A350-900 (via New York JFK/LGA or Los Angeles on Asiana), and the Airbus A380-800 (via New York on Asiana), with the Boeing 777-300ER and 787-8 appearing less often via Doha and Tokyo. The exact aircraft can vary by day and airline, and Wi-Fi and seatback entertainment are widely available on these long-haul types.",
        "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 D.C. to Seoul?",
        "answer": "Korean Air (SkyTeam) and Air Premia (no alliance) operate nonstop flights from Washington Dulles to Seoul Incheon, with Korean Air offering daily service and Air Premia flying four days a week. Air Premia does not belong to any of the three major global alliances, so SkyTeam is the only alliance with a nonstop presence on this route. Other alliances may serve it via connecting 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.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Washington D.C.?",
        "answer": "At Washington Dulles, the United Polaris Lounge in Concourse C offers a premium experience for United Polaris business‑class passengers with sit‑down dining and spa‑style showers. United Clubs are located in Concourses C and D, accessible to United business‑class travelers, Premier Gold members and day‑pass holders. The Turkish Airlines Lounge in Concourse B admits Star Alliance business‑class passengers and Priority Pass members, featuring hot meals and a quiet atmosphere."
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Washington D.C. to Seoul?",
        "answer": "Baggage rules depend on the airline and fare type. Basic economy often excludes free checked bags, while standard economy usually includes one checked bag and a carry-on. Premium cabins provide more generous allowances."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Washington D.C. to Seoul?",
        "answer": "Washington D.C. to Seoul flights typically offer Economy and flat‑bed Business class. Premium Economy is available on some carriers; First class is rare."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies differ by airline and fare; flexible and premium-cabin tickets generally allow same-day changes or standby, while restrictive economy fares may not."
      },
      "q24": {
        "question": "What are the cheapest days and times to fly from Washington D.C. to Seoul?",
        "answer": "The cheapest day to fly from Washington D.C. to Seoul is Monday, with an average fare of $1,901, while Saturday is the most expensive at $2,049. For departure time, the Late Night window offers the lowest minimum price at $1,024, compared to Morning departures which start at $1,250.",
        "methodology": "The cheapest day of the week and time of day to depart are drawn from the same large sample of real fares Priceline users found on this route in the last 72 hours, grouped by the day of the week and by the time-of-day window of the outbound departure, with the lowest and average price reported for each.",
        "relevant": true,
        "toolsUsed": [
          "departure_timing"
        ]
      },
      "q25": {
        "question": "What is a good price for a flight from Washington D.C. to Seoul?",
        "answer": "For flights from Washington D.C. (IAD) to Seoul (SEL), a good fare is anything under $1,392, which is the great-deal threshold, while the typical price runs around $1,946.",
        "methodology": "The typical price, the lowest fare, a 'great deal' threshold, and how fares are spread across price bands are summarized from a large sample of the real fares Priceline users found on this route in the last 72 hours, with a small fraction of extreme outlier fares excluded from the range.",
        "relevant": true,
        "toolsUsed": [
          "price_context"
        ]
      }
    }
  }
}