I don't know how long you want to go for or when, but I just plugged in early May (since that is when I am going next and I know airfares have dropped recently - after I bought of course - and it is the end of Southwest current open window) and for a week +- 3 days.
Northwest has some flights for $197, May 3 (Sat)-May 9 (Fri) or May 3 (sat)-May 12 (Mon) or May 1 (Thur)-May 7 (Wed), May 8 (Thur) or May 9 (Fri) or May 4 (Sun)-May 12 (Mon) or May 5 (Mon)-May 12 (Mon), May 13 (Tues). However, I don't like the times and the layover in Memphis, TN is only 30-40 minutes which would make me nervous.
Sticking to just the non-stops United has some flights for $225. Not necessarily the times I prefer, but non-stops - flying out Wed and returning Mon, Tues, Wed, Thur, Fri or flying out Mon, Tues, Thurs, Fri, Sat or Sun and returning Wed, Thur.
Look at the airline sites too. I see Frontier has flights for $220 Tues to Tues or Wed to Wed and at times I like. But you have to put in each date combination so their site is harder to search for deals.
Other dates can be higher $254, $280, and on up. You just have to play with it. The prices change all the time, so you should start looking now to get a feel for it and then book when you find something you can live with.
