Cheap flights from San Diego to Denver from $31

The cheapest month to fly to Denver from San Diego is in December. Flight prices, which tend to average around $141, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in December, then you should wait until January to fly from San Diego, when ticket prices are also cheap, with an average price of $142.

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $257. 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 Monday, with ticket prices averaging around $317.

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $198. Flights in the afternoon are often more expensive with an average ticket price of $293.

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

You are more likely to see cheaper flights to Denver from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $178 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from San Diego for as low as $145 on momondo.

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

No. A direct flight is the cheapest option for a flight between San Diego to Denver.

As of February 2026, prices for San Diego to Denver flights are approximately 46% more expensive when compared to flights at the same time last year.

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

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Denver from San Diego according to our data. Frontier is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 8 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% of flights between San Diego and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 140 minutes.

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

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

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

As of February 2026, there are 19 flights per day flying from San Diego to Denver. The most common time of day flights depart is 12:00PM, with 43% of flights taking off in the afternoon.

As of February 2026, 135 flights take off from San Diego and land in Denver each week. The most common flight departure day for this route is Mon, with 21% of weekly flights taking off on this day.