Cheap Flights to Denver International Airport
Traveling to the Rocky Mountains? Discover flights to Denver International Airport (DEN), one of the busiest airports in the United States and the main gateway to Colorado’s mountains, ski resorts, and outdoor adventures.
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or request an offerAbout Denver International Airport (DEN)
Denver International Airport serves the Denver metropolitan area and much of the Mountain West. Opened in 1995, it covers more than 33,000 acres, making it the largest airport in North America by land area. It offers nonstop flights to over 230 destinations and is a major hub for United Airlines, with strong operations from Frontier and Southwest.
Airport code
DEN (ICAO: KDEN)
Location
Denver, Colorado, United States
Airlines serving
United, Southwest, Frontier, American, Delta, Alaska, Lufthansa, British Airways, Turkish Airlines, and more
Popular Routes to and from Denver
Denver’s schedule is anchored by frequent service to major western and central U.S. cities, alongside a growing network of long-haul international routes.
Route Type
Popular Connections
Domestic
Phoenix, Los Angeles, Chicago O’Hare, Salt Lake City, Dallas/Fort Worth
International
Vancouver, Frankfurt, London, Paris, Tokyo, Istanbul, Cancún
Best Time to Book Cheap Flights
Booking 6 to 10 weeks ahead generally offers good value for routes into Denver. The best times to visit are typically from June through September for hiking and summer festivals, or from December through March for skiing, so booking further ahead is recommended for travel during those periods.
About Denver
Denver is the capital of Colorado, known as the Mile High City for its elevation of about one mile above sea level. With the Rocky Mountains on its doorstep, the city is a gateway to world-class ski resorts, Rocky Mountain National Park, and outdoor venues like Red Rocks Amphitheatre, alongside a lively culture of museums, breweries, and dining.
Things to Know When Flying Into Denver
Phoenix is the airport’s most frequent route, with around 150 weekly flights, and United is the largest airline by a wide margin.
Denver has more than 230 nonstop destinations, including long-haul routes to Europe and Asia.
The airport is about 25 miles northeast of downtown Denver, and the A Line train reaches Union Station in roughly 37 minutes.
Winter storms can affect schedules, so build in extra connection time when traveling between December and March.
Why Book Your Denver Flights with Airline Tickets Services
Access to unpublished airfare deals
Help finding the best United, Southwest, and Frontier routing options
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FAQs — Flights to International Airport
More than 20 airlines serve Denver International Airport, including United, Southwest, Frontier, American, Delta, Alaska, and international carriers such as Lufthansa, British Airways, and Turkish Airlines.
Phoenix is the busiest route from Denver, with around 150 weekly flights, followed by Los Angeles, Chicago O'Hare, and Salt Lake City.
Yes, Denver is a major hub for United Airlines, the airport's largest carrier, and a key base for Frontier Airlines and Southwest Airlines.
Yes, Denver has nonstop international flights to destinations in Canada, Mexico, Central America, Europe, and Asia, including Tokyo, Frankfurt, London, and Paris.
Booking 6 to 10 weeks ahead generally offers good value, with the best times to visit typically from June through September for summer or December through March for skiing.
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