Cheap Flights from Chicago to Denver — $27

The route Chicago — Denver is served by a single airline — Frontier Airlines. This means that when planning your trip, you won’t need to spend time choosing between dozens of carriers: all flights are operated by one provider, which simplifies the booking process. Despite the limited choice, passengers can still plan ahead, select optimal departure dates, and buy tickets at the lowest price — from $27. Using our service, you can quickly compare available Frontier Airlines flights and book a seat in advance at a favorable rate.

Chicago is served by multiple airports with distinct roles. O’Hare International (ORD) is the city’s primary international hub and a major transcontinental connector, typically hosting full-service carriers and many international and domestic flights; it’s located about 17 miles northwest of downtown. Transit options include the CTA Blue Line (around 35–50 minutes to downtown), taxis or app rides (roughly 30–60 minutes depending on traffic) and airport shuttles; fares can range from local train fares to higher ride-share and taxi rates. Pros: extensive route network and frequent services; cons: can be busy and delays may occur. Midway (MDW) typically functions as Chicago’s budget and domestic-focused airport, popular with low-cost carriers and short-haul flights. It sits roughly 10 miles southwest of the Loop and is usually quicker to reach from the city center. Options include the CTA Orange Line (about 25–35 minutes to downtown), buses, taxis and ride-shares; fares vary by mode but public transit is generally the most economical. Pros: closer to downtown and easier connections for domestic travelers; cons: fewer international routes and a smaller terminal footprint compared with O’Hare. For private, corporate, and some regional services, Chicago-area travelers can also use general aviation fields like Chicago Executive (PWK) or smaller reliever airports located in the suburbs. These facilities typically accommodate business aviation and charter operators rather than scheduled commercial flights. Ground access is primarily by car or pre-arranged car service, offering convenience and shorter processing times for private flyers; however, they lack the wide commercial flight choices and extensive amenities of the major airports.

Denver International Airport (DEN) is the region’s main international hub, serving a mix of legacy carriers and low-cost airlines and typically offering a wide range of domestic and transcontinental connections. Located about 25 miles (40 km) northeast of downtown Denver, travel times to the city center are usually 35–50 minutes by car depending on traffic; ride-shares and taxis can be expected to cost more than public options. The A Line commuter rail links the airport to Union Station in roughly 37 minutes with fares generally in the low single-digit dollars, while shuttle services and hotel transfers add flexibility for cost-conscious travelers. Pros: extensive flight choices and modern passenger facilities; cons: long ground transfer distances and potential for weather-related delays at this high-altitude airport.

The minimum one-way ticket price from Chicago to Denver is $29 (September 2026), while the maximum is $84 (July 2026). On average, a ticket costs $59–$66.