Thanks to theBOSman on FlyerTalk for sharing this one. Although the lowest price (via IAH) is available in September, you can travel earlier via SFO for 4 CPM in August. Other dates may be available. At the best price you’re looking at $258.20 all-in for 6,832 EQM.
There’s also a fair amount of weekend availability at similar prices. I’ve been meaning to go to Boston myself and convince Megan it isn’t such a bad place to live, so maybe I’ll take advantage of one of these if it’s still available tonight. Although you have to pay up to depart out of SEA, you can depart PDX and return to SEA for about the same price.