We've scanned every flight from Manila to Osaka to find the best deals. If you want a cheap flight, it's best to be as flexible as you can on dates. At the moment, the cheapest flight is on 25 / Feb / 2019. If that day's no good for you, try searching by month to see some alternative dates.
Osaka Kansai International Airport is just one of the airports in Osaka. If you're not set on a specific airport, try changing your search from Osaka Kansai International Airport to Osaka to see a broader range of flights – they might be cheaper. It usually takes about 8 hrs 15 mins to fly 2637 km to Osaka Kansai International Airport.
If you're planning on going to Osaka during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.