{"response": {"Key": "DEN-SEL", "orig": {"code": "DEN", "type": "airport", "city": "Denver", "fullCity": "Denver, Colorado", "airport": "Denver Intl Airport"}, "dest": {"code": "SEL", "type": "airport", "city": "Seoul", "fullCity": "Seoul, Korea", "airport": "Incheon Intl Airport"}, "faq": {"q3": {"question": "What are the ground transportation options in Seoul?", "answer": "From Incheon International Airport (ICN), which serves Seoul, the fastest and most-used option is the AREX express train to Seoul Station, taking about 43 minutes and costing 8,000 won. The all-stop commuter train is a cheaper rail alternative at 4,150 won. Airport limousine buses serve many city destinations, with fares around 17,000–18,000 won, while taxis and ride-share services are also readily available. Car rentals are possible but less common due to Seoul's excellent public transit.", "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"}]}, "q4": {"question": "When is the cheapest time to fly from Denver to Seoul?", "answer": "The cheapest months to fly from Denver to Seoul are October, September, and August, with average fares around $1,322 to $1,389. The most expensive months are December, June, and January, where average prices can reach $1,798.", "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 Denver to Seoul?", "answer": "For Denver to Seoul, the best fares typically appear when booking 10 to 13 weeks ahead, with the absolute lowest price around 75 days out. During peak summer and holiday periods, you'll want to book on the early side of that window or even a bit further out, as last-minute tickets can jump to nearly $2,000.", "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 Denver to Seoul?", "answer": "No nonstop red‑eyes operate from Denver to Seoul. Connecting itineraries whose long leg is an overnight red‑eye are available via Los Angeles (LAX) and San Francisco (SFO). The overnight transpacific leg departs between 23:00 and 23:55 and arrives at Seoul Incheon between 04:00 and 04:30 — early morning, the next day. Carriers on the red‑eye leg are Asiana Airlines (OZ), United (UA), and Air Premia (YP), with United or Southwest feeding the connecting domestic flight from Denver.", "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 Denver to Seoul?", "answer": "There are no nonstop flights from Denver to Seoul. Common one-stop routings include Asiana via Los Angeles (around 13 daily patterns) and United via San Francisco (about 7 daily patterns). Other carriers like American via Dallas/Fort Worth, Air Premia via Los Angeles or San Francisco, and Air Canada via Vancouver also appear, though less frequently. Typical per-carrier fares are not available for this 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.", "toolsUsed": ["route_airlines"]}, "q8": {"question": "If I need a connection, what are common layover cities between Denver and Seoul?", "answer": "Common layover hubs between Denver and Seoul include San Francisco, Vancouver, Seattle, and Tokyo. San Francisco offers broad transpacific connections and efficient transfer facilities. Vancouver and Seattle provide relatively direct routings with competitive total travel times. Tokyo is a major Asian hub with extensive onward connections and smooth transit processes. Note that transit through Canada or the US may require appropriate documentation, while Tokyo typically allows visa-free airside transit for eligible nationalities."}, "q10": {"question": "Which months have the best weather for traveling to Seoul?", "answer": "April to early June and September to mid-October offer mild temperatures, low humidity, and fewer visitors."}, "q11": {"question": "What documents should I bring with me to the airport when flying from Denver to Seoul?", "answer": "Bring a passport valid for at least six months, a K-ETA or visa, proof of onward or return travel, a payment method for baggage and any required vaccination certificates."}, "q12": {"question": "Which airport should I use in Seoul?", "answer": "Incheon is Seoul's main international airport, located west of the city centre, and serves as a hub for Korean Air and Asiana with extensive global connections. Gimpo is closer to downtown and handles mostly domestic flights and a few regional international routes, making it convenient for short‑haul travel."}, "q13": {"question": "How do I get to Denver Intl Airport from the city center?", "answer": "From downtown Denver, the most popular and often fastest option is the RTD University of Colorado A Line commuter rail, which runs from Denver Union Station to the airport in about 37 minutes. Ride‑share services like Uber and Lyft, taxis, and shared‑van shuttles are also widely available and offer door‑to‑door convenience at a higher cost, especially during peak times. Driving and parking at the airport is possible with several on‑site lots and garages, but it’s the most expensive choice when factoring in daily parking fees. The train is generally the best balance of speed, cost, and reliability for most travelers.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://www.flydenver.com/parking-and-transportation/to-and-from/airport-transit-center/", "title": "Airport Transit Center | Denver International Airport", "time_published": "2026-02-24T17:09:34Z"}, {"url": "https://flydenver.com/connections/", "title": "Connections | Denver International Airport", "favicon": "https://flydenver.com/apple-touch-icon.png", "time_published": "2023-09-14T15:33:21Z"}, {"url": "https://en.wikipedia.org/wiki/Automated_Guideway_Transit_System_(Denver_International_Airport)", "title": "Automated Guideway Transit System (Denver International Airport)", "time_published": "2026-06-01T08:54:40Z"}, {"url": "https://en.wikipedia.org/wiki/Denver%20International%20Airport", "title": "Denver International Airport", "time_published": "2026-04-30T15:08:23Z"}, {"url": "https://www.faa.gov/?action=searchForAirport&airportcode=PSR", "title": "Federal Aviation Administration", "favicon": "https://www.faa.gov/themes/custom/faa/favicon.png", "time_published": "2026-07-17T12:00:00Z"}]}, "q14": {"question": "Are there hotels or sleeping facilities at Seoul airport?", "answer": "Incheon International Airport (ICN) has an on‑site transit hotel in Terminal 1, located airside on the 4th floor in the East area, with rooms available in 6‑hour blocks. Terminal 2 offers comfortable airside rest zones with reclined loungers near Gates 262–268, and landside there are wide, armrest‑free benches on Level 1. A free underground shuttle train connects the terminals, so no external shuttle is needed to reach these facilities.", "toolsUsed": ["article_lookup"], "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"}]}, "q15": {"question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Incheon Intl Airport?", "answer": "Incheon International Airport (ICN) offers currency exchange services in the pre-security departure hall on the third floor, before you enter the duty-free zone. Prayer rooms and chapels are available across multiple locations, including Terminal 1, the Concourse, and Terminal 2, both in public and duty-free areas. Free Wi-Fi is provided throughout the airport terminals.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://airport.kr/ap_en/1562/subview.do", "title": "International Incheon Airport"}, {"url": "https://airport.kr/ap_en/1542/subview.do", "title": "International Incheon Airport", "time_published": "1999-01-01T00:00:00Z"}, {"url": "https://en.wikipedia.org/wiki/Incheon%20International%20Airport", "title": "Incheon International Airport", "time_published": "2026-04-30T15:03:57Z"}, {"url": "https://en.wikipedia.org/wiki/File:Incheon_International_Airport_Interior.jpg", "time_published": "2013-06-13T00:00:00Z"}, {"url": "https://airport.kr/ap_en/1413/subview.do", "title": "International Incheon Airport"}]}, "q17": {"question": "What aircraft are typically used on flights from Denver to Seoul?", "answer": "There is no nonstop service from Denver to Seoul, so all itineraries involve a connection. On the long transpacific leg the Boeing 787-9 is by far the most common aircraft, operated via hubs like San Francisco, Dallas/Fort Worth, Los Angeles, Vancouver, Calgary, Seattle, and Tokyo on carriers including United, American, Air Canada, WestJet, and Alaska. The Airbus A350-900 also appears on some connections through Los Angeles and San Francisco (primarily on Asiana), and the Airbus A380-800 is available via Los Angeles on Asiana as well. The exact aircraft can vary by day and airline, and Wi‑Fi and seatback entertainment are widely available on these long‑haul aircraft.", "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 Denver?", "answer": "At Denver International Airport (DEN), you'll find the American Express Centurion Lounge in Concourse C and the Delta Sky Club in the Main Terminal, Concourse A. The Centurion Lounge is accessible with select Amex cards like the Platinum Card and features premium food, craft cocktails, and a quiet space to work or relax. The Delta Sky Club offers complimentary snacks, beer and wine, Wi-Fi, and flight monitors, with access for Delta One or SkyTeam premium cabin passengers, Medallion elite members, and certain cardholders, or via a day pass for eligible travelers. Other independent lounges may not be confirmed, so these are the key options for your departure.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://americanexpress.com/en-gb/travel/lounges/the-platinum-card/DEN", "title": "American Express Lounges at Denver International Airport | Amex GB", "time_published": "2026-05-03T00:00:00Z"}, {"url": "https://www.flydenver.com/", "title": "Denver International Airport | DEN", "favicon": "https://www.flydenver.com/apple-touch-icon.png", "time_published": "2026-06-02T21:34:27Z"}, {"url": "https://flydenver.com/at-the-airport", "title": "Exciting Things to Do at Denver International Airport", "time_published": "2026-02-18T15:39:31Z"}, {"url": "https://www.americanexpress.com/en-us/travel/lounges/the-centurion-card-idc-en/DEN/Delta-Sky-Club-Main-Terminal-Concourse-A-IgRTEiZDls/", "title": "Delta Sky Club at Denver International Airport | Amex US", "time_published": "2026-03-18T00:00:00Z"}, {"url": "https://carsandstays.delta.com/Denver-Hotels-Sleep-Inn-Suites-Denver-International-Airport.h23533743.Hotel-Information?categorySearch=any_option&chkin=2026-07-06&chkout=2026-07-07&destType=MARKET&destination=Denver%2C+CO%2C+United+States+of+America+%28DEN-All+Airports%29&latLong=39.74483000000001%2C-104.94829500000002&pwa_ts=1782175590171&referrerUrl=aHR0cHM6Ly9jYXJzYW5kc3RheXMuZGVsdGEuY29tL0hvdGVsLVNlYXJjaA%3D%3D&regionId=6139084&rfrr=HSR&rm1=a2&searchId=b9103c12-38ab-46f5-86a7-f3447411bdbe&selectedRatePlan=383244565&selectedRoomType=218717901&sort=RECOMMENDED&top_cur=USD&top_dp=126&useRewards=false&x_pwa=1", "title": "Sleep Inn & Suites Denver International Airport", "favicon": "https://carsandstays.delta.com/favicon.ico", "time_published": "2026-06-23T09:32:24Z"}]}, "q21": {"question": "What is the baggage allowance on this route from Denver to Seoul?", "answer": "Baggage allowance on Denver–Seoul flights depends on the airline and fare type. Basic Economy often excludes checked bags; standard international 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 Denver to Seoul?", "answer": "On flights from Denver to Seoul, you can typically choose Economy, Premium Economy, and flat-bed Business class; First class is uncommon."}, "q23": {"question": "Are same‑day changes or standby possible on this route?", "answer": "Policies differ by airline and fare; flexible and premium cabin tickets often permit same‑day changes or standby, but Basic Economy typically does not."}}}}