Seattle to Bismarck Flights from US$220 incl. tax

Based on HopeGoo data, Frontier Airlines offers one-way fares as low as US$240 on Cheapest nonstop routes (e.g. SEA to BIS on Fri, Mar 13), while Delta Air Lines offers Cheapest nonstop round-trips from US$270 departing on Fri, Apr 17 and returning on Mon, Apr 20.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Seattle to Bismarck 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 Seattle to Bismarck, 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 Fri, Mar 13, with one-way flights priced at just US$240. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines. · 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 Bismarck travel is around January. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Seattle to Bismarck is August, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Seattle to Bismarck on March 10, 2026 with Delta Air Lines, with prices starting at US$281.

The time difference between Bismarck and Seattle is 2h.

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