So not even worth it 1 way?
Cheapest for economy is BA Avios?
That's what they say. I flew on those kind of seats when I went around Europe, but that was because my itinerary was only like 20K more for getting like 12 legs with those seats and 1 leg better seats (crossing back into US). For a 2 hour flight, I can't see it being worth it.
Avios will be 15K RT. It's possible that SW could be less than that, although if you want to go direct, you may need to fly out of ISP/PHL.