There are one airlines offering flights to Osaka. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly. The cheapest date is currently 31 / May / 2019.
Make sure you use the search options above to search for flights to other airports in Osaka, not just Osaka Kansai International Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 21 hrs 35 mins.
There are about five flights via Osaka every week, so you have plenty of options.
You can expect accommodation prices to be higher at this time of year too. Last-minute deals do crop up, but it's best to book everything in advance to avoid disappointment.