Question : How long are most people's visits to Hanoi when they fly in from Santa Ana?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : In February, Friday is your lowest-cost day to fly. Being flexible with your travel days garners you even more savings during your booking.
Question : Do prices change more for this route than others?
Answer : Prices are fluctuating a lot more for this route than most routes. Prices tend to be lower the further out you book.