Best DEN Flight Deals Book Cheap Flights to Denver
About Denver
Denver is much more than just a destination. It's an experience at the intersection between the Great Plains and the Rocky Mountains. Situated in north-central Colorado at precisely 5,280 feet above sea level, Denver lives up to its "Mile High City" moniker. Denver (DEN) is the city of LoDo, craft breweries, RiNo (the River North Art District), vibrant murals, and independent eateries; 16th Street Mall, the bustling street life of Denver; and Red Rocks Amphitheatre, famous for open-air concerts performed on sandstone. Aside from all of this, Denver acts as a gateway to the skiing destinations of Breckenridge, Vail, and Keystone. In 2025, the city saw over 37.6 million visitors spend a record $10.5 billion on tourism, thanks to its year-round appeal as a playground for outdoor enthusiasts, sports fans, foodies, and culture lovers.
- Cheapest Month to Fly: January (or September and October)
- Best Time to Book Tickets: 30 to 60 days before the travel date
- Cheapest Days to Travel: Tuesday/Wednesday
- Budget-friendly airline: Frontier Airlines; Southwest Airlines
Denver Airports
Denver is mainly accessed through one large international airport, which may be relatively cheaper based on your departure point.
What Are The Best Months To Book Your Flight Tickets To Denver?
The months when flights to Denver (DEN)will prove to be quite inexpensive include the following: January, February, late April, and September to October. Specifically, January is known for being particularly cheap – flights to Denver in January cost around 25% less than average yearly round-trip ticket prices.
The fall shoulder season (Sept-Oct) is the second most economical time to fly to Denver. This is because there is still an absence of skiing season as the previous summer demand declines. The largest number of deals was found when traveling to Denver with going.com flights in October, while the smallest was in June.
Traveling during Christmas holidays, New Year’s holidays, and skiing peak seasons (December through mid-March) is undesirable as prices during that period go up dramatically compared to regular prices, especially when traveling from the main feeder cities such as Los Angeles, New York, Chicago, Dallas, and Houston. The most common sources of tourists traveling for a night at Denver hotels are Los Angeles, New York, Dallas–Fort Worth, Chicago, and Houston. As a result, prices rise during the peak skiing and holiday season flights from the aforementioned routes.
Comparing Denver Airlines, Policy, and Option
The Denver International Airport is an aviation hub where more than 1,700 flights take off every day with connections to over 200 places, thus being the best-connected airport in America. United, Southwest, and Frontier Airlines make up 86% of the 82 million people flying into and out of Denver. Below is the comparison for Denver airline regarding prices and policies, divided by categories of different carriers.
United Airlines
- Personal Item Only (Basic Economy), carry-on luggage is included in the higher fare categories.
- United is the main full-service carrier at the DEN with a vast domestic and international flight network.
Southwest Airlines
- Carry-on and personal item luggage are included in all fares (see note below).
- The airline is known for flexibility and excellent customer satisfaction, a point-to-point route network within America
Frontier Airlines
- Personal item only (standard fares); size limitations.
- The ultralow-cost carrier that offers extensive domestic flight options, based in Denver
American Airlines
- Personal item only (Basic Economy); carry-on is included in the Main Cabin fare and above.
- Domestic network with Denver as the main hub and connecting flights via Dallas/Fort Worth and Chicago O'Hare
Delta Air Lines
- Checked bag fee waived on Main Cabin, In-flight entertainment screens, good SkyMiles perks
Alaska Airlines
- Checked bag fee waived on Saver fares for Mileage Plan members.
- Well-represented at DEN with strong West Coast and Pacific Northwest flights
Watch Out For These Fees Before Booking
There might seem to be nothing but cheap flights to Denver, but baggage fees from ultra-low-cost airlines and Basic Economy fares can pile up fast. Take Frontier Airlines, for example, which permits just one personal item in addition to your carry-on with their basic fare. The addition of an extra overhead roller bag can run as high as $65-$99+. Also, Southwest Airlines recently discontinued its well-known two-bags-fly-free program, so passengers used to this benefit need to take checked bag fees into account when comparing flights on Southwest.
Here’s what to check before you book:
- Overhead allowance to take your bag if eligible within your fare class
- Fees for gate bag check when you need to stow luggage that’s over the size allowed for a personal item
- Information about change and cancellation policies – especially relevant when booking ski trips that might experience frequent weather interruptions
- If seat assignment, travel insurance coverage, or fare protection is included in your ticket price or offered as an add-on
- REAL ID compliance – starting from February 1, 2026, you'll be subjected to TSA ConfirmID if you do not have a REAL ID, and charged an additional $45 per passenger
Note: It is better to book your flight on CompareMost from the most reputable flight booking service providers and at the best prices.
Frequently Asked Questions
Here are some of the questions visitors commonly ask before travelling:
