DLH to SEA, Duluth International Airport to Seattle–Tacoma International Airport Cheap Flights

Based on HopeGoo data, Delta Air Lines offers one-way fares as low as US$162 on Cheapest nonstop routes (e.g. DLH to SEA on Sat, Feb 14), while Delta Air Lines offers Cheapest nonstop round-trips from US$338 departing on Sat, Feb 14 and returning on Thu, Feb 19.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Duluth 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 Duluth 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 Sat, Feb 14, with one-way flights priced at just US$162. · 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 Duluth to Seattle is November, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Duluth to Seattle on February 14, 2026 with Delta Air Lines, with prices starting at US$338.

The time difference between Seattle and Duluth is 2h.

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