Cheap flights from the United States to San Diego from $43

If you are unable to visit San Diego during the month of September, then departing from United States during the month October is also very affordable. Most momondo users find prices during this month for around $337.

The cheapest day to depart from United States to San Diego is on a Tuesday. Travelers who choose to depart for San Diego on a Tuesday will often find tickets for as low as $369. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $485. 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 $367. Flights in the morning are often more expensive with an average ticket price of $409.

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

You are more likely to see cheaper flights to San Diego from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $370 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from United States for as low as $306 on momondo.

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

United Airlines, Southwest, and Frontier are the most popular carriers operating from United States to San Diego

Frontier, Alaska Airlines and American Airlines are the top three most popular airlines that fly to San Diego from United States according to our data. Frontier is the first choice among our users, with 28% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 12 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 19% of flights between United States and San Diego have experienced a delay on any given week. The average delay length over the past 12 months has been 120 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.

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, Delta have had the least number of delays on this route over the last 12 months; with about 14% of their flights experiencing any sort of delay.

193 flights are operational daily from United States to San Diego as of March 2026. The most popular departure time for this route is 4:00PM, with 39% of flights per day taking off in the afternoon.

The number of flights available between United States and San Diego is 1,353 per week as of March 2026. The most frequent departure day is Mon, with 19% of weekly flights leaving on this day.