Depends on your destination. There are FlyBe-only destinations, FlyBe/Finnair destinations, and Finnair-only destinations (falsely announced to be "joint service with Finnair" - although wet leased) in Finland. Where are you headed to?
Be prepared to listen the stupidest onboard safety announcement around. Noise cancelling headset needed.
I was planning to utilize the JYV route to visit some relatives from time to time. I called Finnair customer service, and they confirmed availability of Y seats on the route. However, KVS tool does not show any inventory on the excact dates, neither does BA site like mentioned below.
Is Finnair holding some secret award inventories?
I agree with you that safety announcement is hilarous on Flybe:
..."Safety onboooord folder"...