Cheap Flights to San Francisco County from $19

The cheapest month to fly to San Francisco County is December when demand is low. Off-peak months are usually when you'll find cheap flights. To keep costs down, avoid flying during school breaks and public holidays.

Generally, Los Angeles, San Diego and New York offer cheap flights to San Francisco County. Flexibility, however, is always key to bagging the best fares. Plan your escape midweek or during the off-peak season to keep costs as low as possible.

There are 64 US cities where you can fly to San Francisco County directly from. Compare your options by selecting the "Direct flights only" box on Expedia and choose the best departure point for your trip. Here are a handful of the top cities to leave from:

• Los Angeles
• San Diego
• New York
• Seattle
• Las Vegas

If you're searching for cheap flights to San Francisco County, consider traveling in the low season. Booking as far in advance as possible may also save you money. Or, look for departures on a different day — Thursday flights are on average 16% cheaper than Sunday options.* Sign up to receive price alerts on the Expedia app and you'll be instantly notified when fares drop.

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

It's possible to get good deals on last-minute departures to San Francisco County, especially if your plans aren't set in stone. Think about leaving from a different hub, changing your dates or picking another carrier to get a cheap flight to San Francisco County.

Find the departure dates you want and a price that suits your budget by booking your domestic flight to San Francisco County up to 28 days in advance. Lock in tickets between two and four months ahead if you're flying to San Francisco County from an international destination.*

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

Sundays are generally the best day to book a cheap flight to San Francisco County, with savings of about 8% on average compared to Fridays. If you purchase tickets on a Friday, expect to spend more as this is often the most expensive day.*

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

When you're ready to lock in your flight to San Francisco County, these popular carriers are waiting to welcome you on board:

• United Airlines - 5,259 flights to San Francisco County each month, including 5,259 flights to San Francisco Intl. Airport (SFO) per month.
• Alaska Airlines - 2,197 flights to San Francisco County each month, including 2,197 flights to San Francisco Intl. Airport (SFO) per month.
• Delta Air Lines - 1,196 flights to San Francisco County each month, including 1,196 flights to San Francisco Intl. Airport (SFO) per month.

When you're flying to San Francisco County, the main airport to touch down at is San Francisco Intl. Airport (SFO). You can also jet into nearby hubs like Oakland Intl. Airport (OAK), Norman Y. Mineta San Jose Intl. Airport (SJC) or San Jose, CA (RHV-Reid Hillview). Another possibility worth considering when you fly to San Francisco County is Sonoma County Airport (STS).

Book a San Francisco County, California flight and hotel package deal on Expedia, and you can make significant savings. It's easy to bundle your hotel and flight, and you can even add activities and car rentals to create your own customized San Francisco County break. Plus, nothing beats the convenience of booking everything in one place.

If you booked your flight to San Francisco County in the last 24 hours, you can usually cancel or change it for free. After that, additional costs may apply depending on the airline's rules and restrictions. For more information, head to our Customer Service Portal. Remember that some flights are non-refundable, so you may be offered a credit toward future travel rather than a direct refund. When browsing Expedia, check the "No cancel fee" or "Changes included" filters to see fares with flexible change policies.