To find cheap flights from King Fahd International Airport (DMM) to Portland International Airport (PDX) in December, use flexible dates and multi-hub routing. Consider departing from nearby major airports such as Riyadh or Bahrain if fares drop significantly. Book 6–10 weeks prior to the holidays, set fare alerts, and search for mid-week departures to reduce costs. Look for one-stop itineraries via Dubai (DXB), Doha (DOH) or Istanbul (IST) which often undercut multi-leg routings through Europe. Use synonyms like "economical flights," "budget fares," and location modifiers (e.g., "Dammam to Portland winter deals") in searches, and consider packaged deals including hotels to lower total trip costs. Call-to-action: Subscribe to fare alerts and compare prices now to secure cheap DMM to PDX flights for December.