JetBlue has round-trip flights from Portland (PDX) to New York (JFK) for $178-$188, NONSTOP. Flights September to October. No Sunday departures. Very few weekends available. Origin/Destination reversible.
JetBlue’s “Basic” fares only allow a small personal item (17 x 13 x 8 inches), like a Jansport SuperBreak backpack without a fee. A regular sized carry-on bag will incur a bag fee. To avoid bag fees, consider using a credit card with the “first free checked bag” perk.