$164 Cheap United flights from Washington to Great Falls (IAD to GTF)

Find The Best Day To Fly from Washington to Great Falls

Amazing United IAD to GTF Flight Deals

The cheapest flights to Great Falls Intl. found within the past 7 days were $339 round trip and $164 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Sep 20 - Tue, Sep 23
IAD
Washington
GTF
Great Falls
$339 Roundtrip, found 5 days ago
$339
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 20 from Washington to Great Falls, returning Tue, Sep 23, priced at $339 found 5 days ago
Sat, Sep 20 - Tue, Sep 23
IAD
Washington
GTF
Great Falls
$351 Roundtrip, found 5 days ago
$351
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 20 from Washington to Great Falls, returning Tue, Sep 23, priced at $351 found 5 days ago
Sat, Sep 20 - Tue, Sep 23
IAD
Washington
GTF
Great Falls
$366 Roundtrip, found 5 days ago
$366
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 20 from Washington to Great Falls, returning Tue, Sep 23, priced at $366 found 5 days ago
Sat, Sep 20 - Tue, Sep 23
IAD
Washington
GTF
Great Falls
$385 Roundtrip, found 5 days ago
$385
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 20 from Washington to Great Falls, returning Tue, Sep 23, priced at $385 found 5 days ago
Sat, Sep 20 - Tue, Sep 23
IAD
Washington
GTF
Great Falls
$426 Roundtrip, found 5 days ago
$426
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 20 from Washington to Great Falls, returning Tue, Sep 23, priced at $426 found 5 days ago
Sat, Sep 6 - Tue, Sep 9
IAD
Washington
GTF
Great Falls
$481 Roundtrip, found 2 days ago
$481
Roundtrip
found 2 days ago
Select United flight, departing Sat, Sep 6 from Washington to Great Falls, returning Tue, Sep 9, priced at $481 found 2 days ago

Frequently asked questions

Can I catch a flight from IAD to GTF right now?
For information on any current Great Falls Intl. Airport (GTF) quarantine requirements and travel advice, visit the Covid-19 Travel Advisor. Look before you arrange your flight, so you don't get caught up en route.
What terminal is United Airlines at Washington Dulles Intl. Airport (IAD)?
The information printed on boarding passes can differ from airline to airline. If you're traveling from IAD to GTF with United Airlines and you can't locate your terminal details, consult the airline.
Are there United Airlines non-stop flights from IAD to GTF?
If you're looking at flights with United Airlines from Washington Dulles Intl. Airport (IAD) to GTF, you'll need to make at least one stop. While waiting for your next flight, take the opportunity to enjoy a bite to eat or go for a walk.
How long is a United Airlines flight from IAD to GTF?
As it will take roughly 6 hours and 13 minutes for your United Airlines flight to head from IAD to GTF, consider sticking some travel games in your carry-on. You never know --- the passenger sitting next to you might relish the chance to play to break up the journey.
How many direct and indirect flights does United Airlines fly from IAD to GTF?
United Airlines currently operates no fewer than 2 flights every day from Dulles Intl. Airport to Great Falls Intl. Airport.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to GTF, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.
United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

Travelers ❤️ these 🏨 after their flight to Great Falls

Heritage Inn

Heritage Inn

2.5 out of 5
1700 Fox Farm Road, Great Falls, MT
This smoke-free hotel features a casino, a nightclub, and a restaurant. Traveling on business? Take advantage of the business center, free WiFi in public areas, ...
8/10 Very Good! (1,557 reviews)
"I loved the staff in the casino, they were so friendly and made our evening so much fun!!!"

Reviewed on Jul 16, 2025

Heritage Inn
Holiday Inn Express Hotel & Suites Great Falls by IHG

Holiday Inn Express Hotel & Suites Great Falls by IHG

2.5 out of 5
1625 Market Place Dr, Great Falls, MT
This hotel features an indoor pool and a 24-hour gym. Traveling on business? Take advantage of the business center and free WiFi in public areas. Enjoy the hot ...
7.8/10 Good! (359 reviews)
"Great stay!"

Reviewed on Jul 14, 2025

Holiday Inn Express Hotel & Suites Great Falls by IHG
Crystal Inn Hotel & Suites Great Falls

Crystal Inn Hotel & Suites Great Falls

2.5 out of 5
3701 31st St SW, Great Falls, MT
This hotel features an indoor pool and a gym. Traveling on business? Take advantage of the 24-hour business center, free WiFi in public areas, and free airport ...
9/10 Wonderful! (1,015 reviews)
"Very nice hotel. Highly recommend it!"

Reviewed on Jul 15, 2025

Crystal Inn Hotel & Suites Great Falls
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.