Still haven’t made travel plans for the holidays? The online travel Web site Kayak.com, which aggregates airline ticket prices, has some advice:

¢ Don’t wait. Holiday airfare is more than 25-30 percent higher than last year. As planes fill up, remaining seats will quickly become more expensive.

¢ Fly off-peak days around the holidays. Avoid returning over the weekend; take Monday and Tuesday flights if you can; and, according to Kayak, see if you can save money by flying on Christmas Day or Christmas Eve. Kayak.com has a search tool that allows you to compare prices up to three days before and three days after your desired date.

¢ Check out low-cost carriers serving alternative airports like Burbank or Long Beach, Calif., instead of Los Angeles.