Flight from Fukuoka to Matsumoto

I found information about flights from Fukuoka to Matsumoto on the internet, but not how to buy tickets online. Can anyone help me out wth an site in english, where I can do this? I know I can fly with JAC and JAS, but every site Ive been to where I can buy domestic plane tickets in Japan, tells me that the route is not availaible.

Can anyone help me out wth an site in english, where I can do this?

I doubt that it can be done online in English. But you should be able to do it by phone or through a travel agency:
http://www.jal.com/en/

Or maybe try the following website:
http://www.ai-ticket.com/english/

If you are not living in Japan, I recommend an air pass:
http://www.japan-guide.com/e/e2364.html

Seems nobody serves the route currently.
You might consider flying to Tokyo Haneda, then train or bus it onto Matsumoto. Following two airlines accept online bookings. You are likely to find a cheapish ticket if booking early.

http://www.skymark.co.jp/en/index.html
http://www.ana.co.jp/eng/index.html

Then head to Shinjuku by train or bus (both take about 1 hour), and catch the JR limited express train (6,710yen each way) or the highway bus (3,400yen each way). Both take 3 hours and leave every hour at least.

Seems nobody serves the route currently.

It is currently served by Japan Air Commuter (JAC, member of JAL Group), but operates only on Wednesdays, Thursdays and Saturdays.

I must have been careless...