197 - 328 USD
From most locations, the cheapest flights to Portland can be found during the month of February; however great deals can be found at other times.
From most locations, booking your flights to Portland around 39 days prior to your departure date finds the best deals.
In general, booking your departure to Portland for a Thursday represents the best deal on airfare. Try to avoid a Sunday departure to stay away from the highest prices.
On average you can find the best deals on plane tickets to Portland when looking for flights with noon departure times.