Cheap flights from Denver to San Diego from $31

If you are unable to visit San Diego during the month of January, then departing from Denver during the month February is also very affordable. Most momondo users find prices during this month for around $136.

The cheapest day to depart from Denver to San Diego is on a Thursday. Travelers who choose to depart for San Diego on a Thursday will often find tickets for as low as $200. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $238. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

The cheapest time of day to fly to San Diego is in the evening when flights can be purchased for as low as $181. Flights at noon are often more expensive with an average ticket price of $297.

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

You are more likely to see cheaper flights to San Diego from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $184 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Denver for as low as $146 on momondo.

There are 4 cabin classes available to choose from on Denver Intl to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier is the most popular carrier operating from Denver Intl to San Diego

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to San Diego from Denver according to our data. Frontier is the first choice among our users, with 54% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 8 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

Historically, on average around 20% of flights between Denver and San Diego have experienced a delay on any given week. The average delay length over the past 12 months has been 128 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, Alaska Airlines have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

28 flights are operational daily from Denver to San Diego as of February 2026. The most popular departure time for this route is 7:00PM, with 37% of flights per day taking off at noon.

197 flights are operational weekly from Denver to San Diego as of February 2026. The most popular departure day for this route is Mon, with 23% of flights per week taking off on this day.