In November I did a MR LAX - BOS. Can't recall the booking code, but the fare was $208 RT. Got upgraded both legs, but probably should have kept my E+ seat in row 9, which I would have had all to myself.
At Logan, there is a Legal Seafood by UA ticketing. During the 90 minutes layover, I grabbed a bowl of clam chowder and a steamed lobster which added to the $
It's 2611 miles each way.
Guy sitting next to me on first leg was also doing a MR. Ran into him at LAX on return.
The cheap fare was on a Saturday.