Fly from Philly to Portland for $242 round-trip, including all taxes, on Delta Air Lines.
We found seats for travel over Halloween, departing PHL on October 30, and returning from PDX on November 3.
Other dates are also available throughout fall/winter, any day of the week, with no minimum stay. Fares may vary by a couple of bucks depending on your travel dates.
You'll find more great fares to Portland PDX listed here.