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The route between San Jose (SJC) and Los Angeles (LAX) is among the most important intra-state flights in California, linking the region's technology center with the entertainment and business center of Southern California. Regardless of whether you travel to Los Angeles for work or pleasure, the route serves several flights per day by a good number of budget and full-service airlines. The cities are separated by around 340 air miles, and the time required for the flight varies from 1h 10m to 1h 25m – quite the improvement from 5-6 hours by car via either Interstate 5 or State Route 101. In the best-case scenario, one can find a fare under $100 for a ticket to Los Angeles.

Since there are a lot of budget and legacy airlines competing for the share of passengers flying from SJC to LAX, it is quite easy to find affordable flights on this route.

Fares will be somewhat cheaper after the peak New Year’s travel period. January will be one of the cheaper periods of the year in its second half.
Fares will go up close to Presidents' Day and spring breaks. As families start booking their theme parks in Los Angeles.
A quieter time until the summer season starts. May, in particular, will be one of the cheapest periods of the year.
Summer vacation time and peak season for traveling to theme parks. Even if you are traveling during peak season, booking an off-peak midweek departure will save you money.
There will be plenty of business travelers; however, fewer leisure travelers will make this period a good opportunity to get a fare deal.
Prices go up close to Thanksgiving. Try to book 4-6 weeks in advance to have a chance to get a decent deal.
The costliest month of the year due to the holiday period. Try to book in 6-8 weeks before the desired dates.