Fare of the Day: Boston, MA (BOS) to Seattle, WA (SEA) $180 RT, including all taxes on Continental.
You must be very flexible with dates to get this fare. Most dates are available in early May. 21-day advance purchase restriction, minimum stay of 1 night, maximum stay of 30 days. Travel any day of the week if available, most dates we found were on Tuesday/Wednesday. Depart before June 1, 2011. Dates are going fast, so book soon if interested.
Easiest to book on cheapair.com.