Question : How many days should you spend in San Francisco if you're flying in from Sofia?
Answer : The average time spent in San Francisco by travelers flying from SOF is 39 days.
Question : Would you be willing to change your travel days if it saved you money?
Answer : The cheapest day to fly in December is Saturday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : Are prices changing frequently for this route?
Answer : Prices are fluctuating much more for this route than most. Remember, you can save by booking further in advance.