Cheap flights from San Diego to Colorado from $56

The month of September is, on average, the cheapest month to fly to Colorado from San Diego, with most prices found around $272. The month of May is another great option to travel to Colorado, with average flight prices from San Diego averaging around $272.

The cheapest day to depart from San Diego to Colorado is on a Friday when prices can be found for as low as $251. On the other hand, Monday is the most expensive day to depart from San Diego because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $326.

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $213. In the afternoon is when there is more demand to fly to Colorado, so prices are often more expensive at around $292 per ticket.

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

You are more likely to see cheaper flights to Colorado from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $173 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from San Diego for as low as $133 on momondo.

Frontier, Alaska Airlines, and United Airlines are the most popular carriers operating from San Diego to Colorado

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Colorado from San Diego according to our data. Frontier is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 10 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

As of May 2026, 20 flights take off from San Diego and land in Colorado each day. The most common flight departure time for this route is 6:00AM, with 56% of daily flights taking off at noon.

143 flights are operational weekly from San Diego to Colorado as of May 2026. The most popular departure day for this route is Fri, with 21% of flights per week taking off on this day.