Portland to Seattle Flights from US$100 incl. tax

Based on HopeGoo data, Delta Air Lines offers one-way fares as low as US$134 on Cheapest nonstop routes (e.g. PWM to SEA on Thu, Feb 12), while Delta Air Lines offers Cheapest nonstop round-trips from US$204 departing on Thu, Feb 19 and returning on Thu, Feb 26.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Portland to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Portland to Seattle, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Thu, Feb 12, with one-way flights priced at just US$134. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Seattle travel is around July. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Portland to Seattle is October, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Portland to Seattle on February 19, 2026 with Delta Air Lines, with prices starting at US$204.

The time difference between Seattle and Portland is 3h.

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