$160 Cheap Flights from Great Falls (GTF) to Washington (IAD)

View $160 flight on Wed, Nov 5, 2025Opens in a new window

Popular airlines from Great Falls, MT (GTF-Great Falls Intl.) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from Great Falls to Washington (GTF-IAD)

Prices were available within the past 7 days and start at $160 for one-way flights and $324 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Oct 1 - Sat, Oct 25
GTF
Great Falls
IAD
Washington
$324 Roundtrip, found 3 days ago
$324
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Oct 1 from Great Falls to Washington, returning Sat, Oct 25, priced at $324 found 3 days ago
United
Tue, Sep 30 - Tue, Oct 28
GTF
Great Falls
IAD
Washington
$327 Roundtrip, found 3 days ago
$327
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 30 from Great Falls to Washington, returning Tue, Oct 28, priced at $327 found 3 days ago
Delta
Tue, Sep 30 - Tue, Oct 28
GTF
Great Falls
IAD
Washington
$334 Roundtrip, found 3 days ago
$334
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Sep 30 from Great Falls to Washington, returning Tue, Oct 28, priced at $334 found 3 days ago
Delta
Tue, Sep 30 - Tue, Oct 28
GTF
Great Falls
IAD
Washington
$336 Roundtrip, found 3 days ago
$336
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Sep 30 from Great Falls to Washington, returning Tue, Oct 28, priced at $336 found 3 days ago
United
Sat, Sep 13 - Wed, Sep 17
GTF
Great Falls
IAD
Washington
$354 Roundtrip, found 3 days ago
$354
Roundtrip
found 3 days ago
Select United flight, departing Sat, Sep 13 from Great Falls to Washington, returning Wed, Sep 17, priced at $354 found 3 days ago
Hawaiian Airlines
Tue, Sep 9 - Tue, Sep 16
GTF
Great Falls
IAD
Washington
$371 Roundtrip, found 4 days ago
$371
Roundtrip
found 4 days ago
Select Hawaiian Airlines flight, departing Tue, Sep 9 from Great Falls to Washington, returning Tue, Sep 16, priced at $371 found 4 days ago
United
Tue, Sep 30 - Tue, Oct 28
GTF
Great Falls
IAD
Washington
$372 Roundtrip, found 3 days ago
$372
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 30 from Great Falls to Washington, returning Tue, Oct 28, priced at $372 found 3 days ago
Delta
Tue, Sep 30 - Tue, Oct 28
GTF
Great Falls
IAD
Washington
$382 Roundtrip, found 3 days ago
$382
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Sep 30 from Great Falls to Washington, returning Tue, Oct 28, priced at $382 found 3 days ago
Delta
Wed, Aug 6 - Tue, Aug 12
GTF
Great Falls
IAD
Washington
$389 Roundtrip, found 2 days ago
$389
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Aug 6 from Great Falls to Washington, returning Tue, Aug 12, priced at $389 found 2 days ago
Alaska Airlines
Sat, Aug 30 - Sat, Sep 6
GTF
Great Falls
IAD
Washington
$411 Roundtrip, found 1 day ago
$411
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sat, Aug 30 from Great Falls to Washington, returning Sat, Sep 6, priced at $411 found 1 day ago
Flights from Great Falls (GTF) to Washington (IAD)
Origin airport
Great Falls Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$323
Distance
1789 mi

Great Falls to Washington Flights

The cheapest times to fly from Great Falls to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Great Falls to Washington are during the month of October. You can find some of the cheapest flights from Great Falls to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Great Falls to Washington

Sunday is one of the best days to book for cheap flights from Great Falls to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Great Falls to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Great Falls to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $160 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Great Falls to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Great Falls to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD) cost?
Discover the latest flight deals from GTF to IAD by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from GTF to IAD?
The cheapest flights from GTF to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from GTF to IAD?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from GTF to IAD. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD)?
There aren't any daily direct flights available from Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from GTF to IAD?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can vary depending on a range of factors, such as the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD)?
To avoid potential delays on the Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD) route, aim to travel before 3 PM. Departures after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute bookings from GTF to IAD are usually more expensive. To lock in the lowest prices, start searching for flights as soon as possible. That said, if you're flexible with your travel dates, it's possible to find a cheap ticket just before your departure.
Is it cheaper to book a GTF to IAD flight and hotel package?
Compared with arranging hotels and flights separately, booking a GTF to IAD flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place will take the stress out of travel planning. Simply secure your flights and select from our wide range of hotels, then tailor your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Great Falls Intl. Airport (GTF) to Washington Dulles Intl. Airport (IAD)?
It's usually possible to reschedule or cancel your GTF to IAD flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.