According to http://www.mspupdate.com/airlinenews/index.htm the A330 is scheduled to fly MSP/SEA and SEA/MSP between August 7th and 28th.

The MSP-SEA A330 flight is #161, leaving MSP 5:20P, Arriving SEA 6:58P
The SEA-MSP A330 flight is #158, leaving SEA 8:45A, Arriving MSP 1:57P

There's nothing scheduled for PDX-MSP