Question : What day in the next four weeks has the best fares?
Answer : Since low prices are preferred, look at Mar 6th. As of Feb 20th, it's showing the cheapest ticket sales at $698. That is 46% below the average price for this route, so you can spend that extra money on an adventure in Portland.
Question : Is the price you found a good deal?
Answer : Ranging anywhere from $698 to $3,396, prices for LGW to PDX do fluctuate a lot more than most routes from the United Kingdom. Prices tend to be lower the further out you book.
Question : How many days should you spend in Portland?
Answer : The average time spent in Portland by travelers from London is about one week.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : The best day to fly on a budget this month is Wednesday. Flexibility is paramount when booking travel plans in order to keep travel costs down.