Question : Do travelers from Tokyo typically stay in Detroit for very long?
Answer : Of course you're not most people, but if you were, you'd stay roughly 14 days.
Question : Is price more important than specific travel days for you?
Answer : The cheapest day to fly in December is Monday. Being flexible with your travel days garners you even more savings during your booking.
Question : How often are prices changing for this route?
Answer : Flight prices for HND to DTW fluctuate much more than the majority of routes. The further out you book a route, the more likely you are to save.