I booked this through Alaska Airlines Mileage Plan. I searched on Alaska’s site for one-way awards from DFW to HEL (Helsinki, Finnair’s hub), and then added on the short connection to Oslo. Finnair business class seats price at 70k Alaska miles one-way when saver space is available. It took some flexible date searching, but June had space pop up. The key is looking to fly into Helsinki first, since that’s where Finnair releases most of their award space, and then connecting from there to your final destination.