AY SEA-HEL several months out seems reasonably priced. Even slightly cheaper than on finnair.com. PE is only a couple hundred more than Y. J is double that.

They don't seem to offer many destinations though. I'd like to book SEA-HEL-ARN but AS doesn't return anything for that. AY runs a flight between HEL and ARN hourly. You should be able to connect anywhere in Europe easily, you just can't book it with AS.

One thing that's not quite clear to me is if you book it on alaskaair.com with the BofA card, do you earn 3x? The terms say "Alaska Airlines tickets".