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United Airlines have round trip airfares travelling from Portland (PDX) to Puerto Vallarta Mexico (PVR) for $ 287, making 1 stop.
Travel Availability:
Departs PDX: Oct 28, 30-31; Nov 11, 28-29; Dec 11; Jan 4, 11-12, 15-17, 19, 23, 25-26, 29-31; Feb 1, 6, 28; March 6; April 12
Returns: wide and good availability, generally with minimum 7 day stay
Use dates and book on Orbitz [orbitz.com], Priceline [priceline.com] or United Airlines [united.com]. Bundling hotel with airfare will save money.