SAS does not show any F availability in their customer interfaces, the only sure way is to call them. Can also suggest Awardfares.

Note that you will not find any LH F awards more than 3-4 days out with SAS award given recent experience, so you won't find anything for end of Feb now.

I would advise high level of flexibility, last LH F award I booked the same day. Might be an idea to have a back up option if you need to travel.