Question : How long are most people's visits to San Francisco when they fly in from Lima?
Answer : Of course you're not most people, but if you were, you'd stay roughly 42 days.
Question : Will you do what it takes to get the absolute cheapest flight?
Answer : The best day to fly on a budget this month is Monday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : Do prices change more for this route than others?
Answer : Prices for LIM to SFO do change much more than the majority of routes. The further out you book a route, the more likely you are to save.