Cheapest return PDX–STN flights, September

AirHint found the following cheapest return flights from Portland (PDX) to London (STN) in September 2026 (see full year).

Return flights

24 Sep - 09 Oct Icelandair
08 Sep - 05 Oct KLM
28 Sep - 11 Oct Icelandair

Also check the deals for one-way flights from Portland to London in September.

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