Searching on United.com we found flights departing DTW on Friday, March 2 and returning from PDX on Tuesday, March 6, 2018. There is scattered availability throughout the Winter/Spring. Fares are available for travel on any day of the week if seats can be found. Keep in mind this is a Basic Economy fare, meaning your carry-on allowance is limited to just one small personal item such as a purse or small backpack up to 17x10x9 inches. Other restrictions apply. Consider the higher regular economy fare if you need more carry-on allowance.
Need a place to stay in Portland? Here is a list of what is available for the listed dates on Hotelwatchdog.