{ "response": { "Key": "DEN-CHI", "orig": { "code": "DEN", "type": "airport", "city": "Denver", "fullCity": "Denver, Colorado", "airport": "Denver Intl Airport" }, "dest": { "code": "CHI", "type": "airport", "city": "Chicago", "fullCity": "Chicago, Illinois", "airport": "Dupage County" }, "faq": { "q0": { "question": "What is the typical flight duration from Denver to Chicago?", "answer": "A nonstop flight from Denver to Chicago typically takes about 2 hours 30 minutes. With a layover, travel time often extends to 4–6 hours depending on the connection. Return flights from Chicago to Denver are generally about 2 hours 15 minutes nonstop, slightly shorter due to prevailing tailwinds." }, "q1": { "question": "Are there any direct flights from Denver to Chicago?", "answer": "Yes, there are plenty of nonstop flights from Denver to Chicago. United, American, Southwest, and Frontier all fly daily nonstop from Denver to O'Hare (ORD), and Southwest also flies daily to Midway (MDW) while Frontier serves Midway five days a week (Monday, Thursday, Friday, Saturday, Sunday). Combined, there are over 580 nonstop flights a week between Denver and the Chicago airports.", "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" ] }, "q4": { "question": "When is the cheapest time to fly from Denver to Chicago?", "answer": "The cheapest months to fly from Denver to Chicago are October, September, and August, with average fares as low as $193 in October. The most expensive months are June, November, and April, with average fares peaking around $343 in June.", "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 Chicago?", "answer": "For flights from Denver to Chicago, the optimal booking window is about 3 to 6 weeks before departure, with the best single fare at $156 around 25 days out. Fares are lowest in that range and rise significantly for last-minute or very early bookings, with the priciest at $424 when booked 180 days ahead. For summer or holiday travel, it's wise to book toward the earlier end of that window, as prices tend to climb faster and availability tightens.", "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 Chicago?", "answer": "Yes, overnight red‑eye flights are available from Denver to Chicago. Southwest operates daily red‑eyes from Denver to Chicago Midway (MDW) departing between 9:00 PM and 9:55 PM, and United runs a Friday‑and‑Sunday red‑eye to Chicago O'Hare (ORD) departing at 9:05 PM. On a flight of this length, those late departures land the same night — typically around midnight or just after — so they arrive in the late evening, not 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" ] }, "q7": { "question": "Which airlines usually operate this route from Denver to Chicago?", "answer": "Southwest, United, American, and Frontier all fly nonstop from Denver to Chicago. Southwest operates up to 206 weekly flights into Midway and another 71 into O'Hare; United offers 162 weekly flights and American 111, both into O'Hare. Frontier serves O'Hare 22 times a week and Midway 10 times a week. Median fares per carrier 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" ] }, "q9": { "question": "How reliable are on‑time departures on this route from Denver to Chicago?", "answer": "On-time departures are generally reliable, but afternoon thunderstorms in Denver and Chicago can cause delays. Early morning flights, especially on United and Southwest, tend to have the best on-time performance." }, "q10": { "question": "Which months have the best weather for traveling to Chicago?", "answer": "May, June, and September offer pleasant temperatures and fewer tourists than mid‑summer." }, "q11": { "question": "What documents should I bring with me to the airport when flying from Denver to Chicago?", "answer": "For domestic U.S. flights, bring a Real ID or passport, ensure the name matches your ticket and carry payment for baggage and any required health documents." }, "q12": { "question": "Which airport should I use in Chicago?", "answer": "O'Hare is the primary international gateway, 17 miles from downtown, with extensive domestic and global routes. Midway is 10 miles from the Loop, closer to the city, and serves mainly Southwest Airlines for domestic low-cost flights. Choose O'Hare for international connections or a broader network, and Midway for budget domestic travel." }, "q13": { "question": "How do I get to Denver Intl Airport from the city center?", "answer": "The most popular and fastest way to reach Denver International Airport from downtown is the RTD A‑Line commuter train, which runs directly from Denver Union Station to the airport transit center in about 37 minutes. Regional buses also serve the airport transit center, and ride‑share services like Uber and Lyft offer door‑to‑door convenience at a higher cost. Taxis are available but generally more expensive than ride‑share, while driving and parking on‑site is possible with various lot options, though it’s often the priciest choice for longer trips.", "toolsUsed": [], "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" } ] }, "q17": { "question": "What aircraft are typically used on flights from Denver to Chicago?", "answer": "On nonstop flights from Denver to Chicago, the most common aircraft are the Airbus A321neo, Boeing 737 MAX 8, Boeing 737-800, and Boeing 737-900. A few flights show unspecified aircraft types, so the exact model can vary by day and airline. Wi-Fi and seatback entertainment are widely available on these aircraft, though specific offerings depend on the carrier.", "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 Denver to Chicago?", "answer": "The nonstop carriers on Denver–Chicago are United (Star Alliance), American (oneworld), Southwest (no alliance), and Frontier (no alliance). United and American are the alliance members; Southwest and Frontier are major carriers that belong to no global alliance. Other alliances may serve the route via connections, but no SkyTeam carrier flies it nonstop.", "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 Denver?", "answer": "At Denver International Airport, the main lounge options are the Delta Sky Club in the Main Terminal, Concourse A (accessible with a Delta Sky Club membership, Delta One or SkyTeam premium cabin tickets, or certain American Express cards, and featuring premium food, beer and wine, and Wi‑Fi) and the Centurion Lounge in Concourse C (available to American Express Platinum and Centurion cardholders, with complimentary food, cocktails, and a quiet space to relax).", "toolsUsed": [], "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®ionId=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 Chicago?", "answer": "Baggage policies vary by airline and fare on Denver–Chicago flights. Basic Economy often does not include a checked bag, but a carry‑on is usually allowed. Standard economy typically includes both a carry‑on and a checked bag." }, "q22": { "question": "What cabin and seat options are typical from Denver to Chicago?", "answer": "Flights from Denver to Chicago typically offer Economy, extra‑legroom Economy, and domestic First Class with recliner seats. Flat‑bed Business and Premium Economy are not common on this short‑haul domestic route." }, "q23": { "question": "Are same‑day changes or standby possible on this route?", "answer": "Policies vary; flexible fares and premium cabins often allow same‑day changes or standby, while Basic Economy typically does not." } } } }