Question : Looking for the cheapest flight over the next 30 days?
Answer : As of January 16th, the best day for booking to San Francisco (SFO) from Kolkata (CCU) is February 9th. Bookings have been made roughly 43% below the average price for this route.
Question : How many days should you spend in San Francisco if you're flying in from Kolkata?
Answer : Of course you're not most people, but if you were, you'd stay roughly 54 days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : For the month of February, the cheapest day to fly is Sunday. Being flexible with your travel days garners you even more savings during your booking.
Question : Are prices changing frequently for this route?
Answer : Prices are fluctuating much more for this route than most. However, the sooner you book, the better price you tend to get.