Go through your results for flights to Okayama in Japan with Netflights. Although Lufthansa usually has the best prices, it's best to double check what's available for your travel dates.
If you don’t have set dates for when you want to fly to Okayama, try searching by month – that way, you can compare airfares throughout the year.
Look out for flights with Lufthansa, as they often have good deals. Or broaden your search by looking at other airports in Japan.
Looking at a few different departure airports will give you even more choice. See what you can find. And remember, it's best to book your flights in advance wherever possible.