Cheap flights from California to Denver from $25

The cheapest month to fly to Denver from California is in September. Flight prices, which tend to average around $201, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in September, then you should wait until January to fly from California, when ticket prices are also cheap, with an average price of $209.

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $274. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $350.

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $257. Flights in the morning are often more expensive with an average ticket price of $301.

Fly from San Diego to Denver Intl for the best California - Denver Intl flight prices

You are more likely to see cheaper flights to Denver from California when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $217 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from California for as low as $170 on momondo.

Southwest, Delta, and Frontier are the most popular carriers operating from California to Denver Intl

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Denver from California according to our data. Frontier is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 9 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

The number of flights available between California and Denver is 252 per day as of May 2026. The most frequent departure time is 2:00PM, with 39% of daily flights leaving in the afternoon.

As of May 2026, 1,764 flights take off from California and land in Denver each week. The most common flight departure day for this route is Thu, with 18% of weekly flights taking off on this day.