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The Denver (DEN) to Las Vegas (LAS) route is a very popular connection between two of the major hubs in the Western US and is a frequent pick for those visiting Vegas for its entertainment, conventions, or just a weekend trip away, as well as for those just connecting through DEN from the cities' widespread flight routes. It is roughly 630 miles (1,014 km) long, and nonstop flights typically take between 1 hour 55 minutes and 2 hours 10 minutes. It is often easy to find a great deal when traveling this route, as it is heavily used for pleasure and leisure and by many budget-friendly carriers. It doesn't matter if you're heading on a short weekend trip to Vegas or traveling for a while, seeing Denver along the way: you can consider many factors to find the best fare for you when booking your flight.

The Denver to Las Vegas route is primarily used for vacationing, which is why the flight prices tend to be highest on the weekends, during the holiday season, and during major events in the Vegas region.

There is a large number of visitors flying from DEN to LAS throughout the year, but many travel patterns can be expected to affect the ticket prices on these flights.
January typically has fewer visitors and is one of the cheapest months to visit. Travel pricing usually comes down after the first 2-3 weeks of the year.
At the beginning of the year, Las Vegas hosts several large trade shows and conventions. Booking tickets for those particular days and around those events will typically be pricier as those visiting for business are willing to pay more.
Summertime brings many people to Las Vegas on vacation, so demand rises. Similar to weekends, fares in summer tend to be much more expensive at the end of the week.
This period marks the start of the colder seasons as summer vacationers head back home, resulting in lower prices overall. The second half of this period of the year will start to increase more when considering the holidays that are coming up!
Starting at the beginning of November, many will start traveling again due to a large variety of holidays happening in December. Flights to and from Las Vegas at this point in time will see more people booking.
Because New Year's Eve is in Las Vegas, prices will generally be the highest they are all year, around the holiday. If you are flying to the area for a specific reason, book early; it's usually recommended to book 6-8 weeks in advance!