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 £270 incl. all taxes and fees. (But excluding checked bag in base fare). Flights have one layover in Dallas or 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 9th of January and 27th of February 2019. Based on date of latest inbound flight back to London. Book this promotion by 15th of December or until the cheapest flights last..
London – Portland from £290 (Directly with airline)
Booking sample of cheap flights from London to Portland from £270 return! In this case you would depart from the United Kingdom to America (Oregon) on 11th of February. Inbound flight from USA back to London Heathrow on 27th of February 2019.