Thanks, I'm actually able to achieve some results with Wideroe, even though the the fares seem to be somewhat more than what the SAS web site is quoting me (but this could be just the taxes at ARN, the system treating me as an o/d passenger instead of connecting). I did found a nice and working HEL-ARN/ARN-FRA-HEL routing that will get me back to HEL just after 13.00 for 255 EUR + the service fee. I need to think about this for a while, though.

The Deutsch site looked otherwise good, but since my German has become too rusty over the recent years I couldn't really figure it out and decided to pass for now.

Once more thanks.