UA: PDX-ZFV (€171; shows €182, but is €171 when you click through to United's site):
http://www.kayak.de/flights/PDX-ZFV/...10-06-flexible
UA: ZFV-PDX (€176; shows €187, but is €176 when you click through to United's site):
http://www.kayak.de/flights/zfv-pdx/...10-06-flexible
More cities might be available with the ZFV combination (if last time these were available was any indication)