Question : Do prices fluctuate more for this route than others?
Answer : Flight prices change a lot less than the majority of routes from Japan for KOJ to STL. They vary from $3,926 to $4,518. The further out you book a route, the more likely you are to save.
Question : In the next four weeks, what day should you book your trip?
Answer : Since low prices are preferred, look at Sep 28th. As of Sep 25th, it's showing the cheapest ticket sales at $3,926. That is 4% below the average price for this route, so you can spend that extra cash on an adventure rather than the flight.
Question : How long do most people visit Saint Louis?
Answer : Of course you're not most people, but if you were, you'd stay roughly nine days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : The lowest-cost day to fly in October is Thursday. Having flexibility in your travel plans means you can save more, so be sure to plan ahead when possible.