Cheap flights from New Hampshire to San Diego from $120

If you are unable to visit San Diego during the month of January, then departing from New Hampshire 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 New Hampshire 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 $341. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $440. 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 afternoon when flights can be purchased for as low as $366. Flights in the morning are often more expensive with an average ticket price of $387.

You are more likely to see cheaper flights to San Diego from New Hampshire when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $373 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from New Hampshire for as low as $322 on momondo.

Delta, United Airlines, and Southwest are the most popular carriers operating from New Hampshire to San Diego

Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to San Diego from New Hampshire according to our data. Southwest is the first choice among our users, with 53% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 3 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

As of February 2026, there are 52 flights per week flying from New Hampshire to San Diego. The most common day of the week flights depart is Thu, with 21% of flights taking off on this day.

On average, it takes 7h 25m to fly from New Hampshire to San Diego if you fly out of Manchester (the most popular airport in New Hampshire) and into San Diego (the most popular airport in San Diego). If you’re flying out of Lebanon and into San Diego, then the flight time is around 9h 08m.