When trying to reach the Finncomm web page the flybe page opened.
I found time tables from Helsinki for Trondheim (3 or 4 times a week, not sure), Umeå (3 to 4 times a week), Mariehamn (twice a day), Tartu (six times a week). The price for Trondheim was 69 €. The time timetables are not very well suited for connecting flights to Europe or Asia (leaving a little bit too early and arriving a little bit too late).

The routes from Tallinn will be: Oulu, Turku, Tampere, Vaasa and Stockholm Bromma. I'm still not quite sure, if this going to work. Twice a day to Turku and thrice a day to Tampere.

You can put your AY+ number in the reservation. They don't seem to accept Flybe's own FF programme. Baggage is charged.