The best thing you can do is to purchase a ticket early for your trip to San Diego. Usually, Airlines tend to offer the lowest prices on 21-day advance tickets. Take note that advance purchase fares can often be secured in as little as 14 or 7 days ahead of your departure schedule. Don't wait until fewer than seven days, you're unlikely to find a good deal for sure.

Purchasing early is a great chance for you but take note; not too early. When you are trying to book months in advance and you can't find the fare you want just be patient. Chances maybe airfares fluctuate and a lower fare may come up at a later date.

Keep in touch for announced airfare sales. And of course for one thing, fares may go up. The best you can do is to compare fares to get an idea of an average price for your desired trip and check several sites over a period of time to see what's happening with rates; then you'll recognize a good deal when you use it. In comparing fare, browse multiple travel sites for deals. And one more thing, read the news. There are sites that provide news of airfare deals and these sites provide links or phone numbers to book these deals directly from the airlines or e-travel agents.