The cost of a flight ticket to Denver depends on various factors such as the departure city, time of booking, season, and airline. On average, a one-way domestic ticket to Denver can range from $100 to $300, while round-trip fares may cost between $200 and $500. Prices tend to be lower if booked well in advance or during off-peak travel times. Denver International Airport (DEN) serves as a hub for many airlines, providing a wide range of options. Budget carriers like Southwest and Frontier often offer competitive rates. Consider comparing fares on travel websites or apps for the best deals, and remember to factor in additional costs like baggage fees or seat upgrades for a more accurate estimate.