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Los Angeles (LAX) to San Francisco (SFO) is the second busiest domestic route in America, and it's a very competitive air corridor. Whatever the reason for your travel, be it business, a tech conference, or just a weekend getaway, you'll have flights on the hour throughout the day, with over 35 daily direct non-stop flights. Both cities are separated by just 337 air miles, and flight times are only between 1h 15m and 1h 35m, which is a significant difference from the 5-6 hours you'll spend in a car. With smart booking, affordable fares can be secured on the LAX-SFO route any time.

As you can see, the Los Angeles (LAX) to San Francisco (SFO) route is extremely competitive. That competition benefits you as the customer.

The prices for these year-round, non-stop services vary considerably based on demand, school holidays, and events.
Holiday fares will dip steeply following the first week of January, making late January one of the cheaper months to fly. Expect fares to be anywhere from one way.
The fares climb with the rise of Valentine's Day week and spring break. During the spring break time, 4-5 weeks in advance will likely be sufficient to obtain reasonable fares.
There is a small window in the spring that is affordable before the summer months. It is especially recommended to aim for May to seek cheaper fares because competition is low during that month.
This time is peak season, and July has the highest fares year-round. If you want to travel in summer, you can save $60 or more per round trip just by travelling midday midweek.
This is the cheapest time to travel and also the best weather. The number of travelers drops sharply after Labor Day, resulting in the year's lowest fares and good weather in the Bay Area.
Fares rise steeply for holiday travel at Thanksgiving. Aim to book 6-8 weeks in advance for reasonable prices.
This is the most expensive month for travel. Christmas, New Year's, and other winter holidays are major reasons for prices to reach their highest points of the year. You will want to try to book 6-8 weeks in advance if possible.