GTF to SEA, Great Falls International Airport to Seattle–Tacoma International Airport Cheap Flights

Based on HopeGoo data, Alaska Airlines offers one-way fares as low as US$72 on Cheapest nonstop routes (e.g. GTF to SEA on Sat, Apr 4), while Delta Air Lines offers Cheapest nonstop round-trips from US$104 departing on Wed, Mar 18 and returning on Wed, Mar 25.

It takes about 1 hour 54 minutes to fly from Great Falls to Seattle.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Great Falls 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 Great Falls 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, Apr 4, with one-way flights priced at just US$72. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska 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 Seattle travel is around July. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Great Falls to Seattle is November, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Great Falls to Seattle on March 18, 2026 with Delta Air Lines, with prices starting at US$104.

The time difference between Seattle and Great Falls is 1h.

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