WAS to GTF, to Great Falls International Airport Cheap Flights

Based on HopeGoo data, Delta Air Lines offers one-way fares as low as US$131 on Cheapest nonstop routes (e.g. IAD to GTF on Sat, Apr 25), while United Airlines offers Cheapest nonstop round-trips from US$325 departing on Thu, Mar 12 and returning on Tue, Mar 17.

It takes about 14 hours 24 minutes to fly from Washington D.C. to Great Falls.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Washington D.C. to Great Falls 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 Washington D.C. to Great Falls, 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 25, with one-way flights priced at just US$131. · 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 Great Falls travel is around August. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Washington D.C. to Great Falls is September, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Washington D.C. to Great Falls on March 12, 2026 with United Airlines, with prices starting at US$325.

The time difference between Great Falls and Washington D.C. is 2h.

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