(I believe) this is a decent fare.

RDU-SEA r/t in the $170s for DL in Basic Economy. Earns 4708 MQMs for 3.6 cpm. Main cabin is $230s for 4.9 cpm.

There are same day turnarounds, including on weekends on Feb 2, 3, 9. Also flexibility to stay for 1 or more nights. See lots of dates from Jan 28 to mid March. Bookable on DL.

Similar AS Saver fares seen.