Keep in mind that while Avios can be a good deal, the flights will be priced point to point. For example ANC-BOS will require pricing in Avios from ANC-SEA (10,000) and then SEA-BOS (12,500) for a total of 22,500 each direction.

Here is the Avios calculator:

http://www.britishairways.com/travel...r/public/en_gb