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Find Cheap Flights from Boston to San Francisco (BOS - SFO)

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Good to know

Low season:
February
Best time to beat the crowds
1%
expected price decrease
High season:
November
Most popular time to fly
4%
expected price increase
Average price:
£255
(price for this month)
Good deal:
£235
or less return trip within
2 months
of travel is a good deal

When to Book Flights from Boston to San Francisco

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for finding a cheap flight

The cheapest flight from Boston to San Francisco was found, on average, 31 days before departure.
Book at least 1 week before departure in order to get a below-average price.
On average*, there is no price difference when choosing to fly in the morning or the evening on this flight route.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days