Bargain deals from Europe to the U.S. state of Oregon are fairly rare so here is one based American Airlines / British Airways promotion. Cheap return flights from London to Portland are now available already for £254 incl. all taxes and fees. (But excluding checked bag in base fare). Flights have one layover in Chicago on your way..You would fly mostly on board of American Airlines but in some case you can choose flights on British Airways. (Both carriers are members of Oneworld alliance). This is indeed great option for travelers in the UK as well as anyone in Europe who can easily reach London..
Discount with British Airways / American Airlines is available when traveling from the UK to USA between September 2018 to 27th of June 2019. Blackout period 12th to 26th of December 2018 or 5th to 24th of April 2019. Max stay 12 months. Book this promotion by 15th of October or until the cheapest flights last..
London – Portland from £276 (Directly with airline)
Booking sample of cheap flights from London to Portland from £254 return! In this case you would depart from the United Kingdom to America (Oregon) on Saturday, 4th of May. Inbound flight from USA back to London Heathrow on 14th of May 2019.