We've compared all 18 flights that go to or via San Francisco every week, to find the best deal for you. Alaska Airlines usually has the cheapest flights from Boston to San Francisco, so keep an eye out for them in your search results. If they’re not the cheapest option, try searching by month to compare costs throughout the week.
When you fly 4344 km from Boston to San Francisco, you can choose from two airlines. Flights are most expensive during high season, and you can expect accommodation prices to be higher then too. Last-minute deals do crop up, but it's best to book in advance to avoid disappointment.
To sort cheap flights to San Francisco, it's best to start searching for flights by month, as this will show you when prices are at their lowest. Keep an eye on JetBlue too, as they're the most popular airline for flying from Boston to San Francisco.
It takes about 8 hrs 15 mins to fly from Boston to San Francisco. Once you’ve chosen your flight, go through and fill out your details to complete your booking. If you haven’t yet sorted your hotel or car hire, take a look at our competitive rates – then you can book your flights and accommodation in one go.
