$1,400 Cheap Flights from Great Falls (GTF) to Guam (GUM)

View $1,400 flight on Fri, Apr 24, 2026Opens in a new window

Popular airlines from Great Falls, MT (GTF-Great Falls Intl.) to Barrigada - A.B. Won Pat International Airport (GUM)

Cheap Flights from Great Falls to Guam (GTF-GUM)

Prices were available within the past 7 days and start at $1,400 for one-way flights and $1,790 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, Apr 22 - Tue, May 12
GTF
Great Falls
GUM
Guam
$1,790 Roundtrip, found 20 hours ago
$1,790
Roundtrip
found 20 hours ago
Select Alaska Airlines flight, departing Wed, Apr 22 from Great Falls to Guam, returning Tue, May 12, priced at $1,790 found 20 hours ago
Alaska Airlines
Wed, Apr 22 - Fri, May 15
GTF
Great Falls
GUM
Guam
$1,840 Roundtrip, found 20 hours ago
$1,840
Roundtrip
found 20 hours ago
Select Alaska Airlines flight, departing Wed, Apr 22 from Great Falls to Guam, returning Fri, May 15, priced at $1,840 found 20 hours ago
Delta
Wed, Apr 22 - Sun, May 10
GTF
Great Falls
GUM
Guam
$1,853 Roundtrip, found 20 hours ago
$1,853
Roundtrip
found 20 hours ago
Select Delta flight, departing Wed, Apr 22 from Great Falls to Guam, returning Sun, May 10, priced at $1,853 found 20 hours ago
Delta
Sun, Apr 26 - Sun, May 10
GTF
Great Falls
GUM
Guam
$1,857 Roundtrip, found 20 hours ago
$1,857
Roundtrip
found 20 hours ago
Select Delta flight, departing Sun, Apr 26 from Great Falls to Guam, returning Sun, May 10, priced at $1,857 found 20 hours ago
Delta
Thu, May 14 - Sat, May 30
GTF
Great Falls
GUM
Guam
$1,903 Roundtrip, found 20 hours ago
$1,903
Roundtrip
found 20 hours ago
Select Delta flight, departing Thu, May 14 from Great Falls to Guam, returning Sat, May 30, priced at $1,903 found 20 hours ago
Delta
Sun, Feb 8 - Thu, Feb 26
GTF
Great Falls
GUM
Guam
$1,907 Roundtrip, found 5 hours ago
$1,907
Roundtrip
found 5 hours ago
Select Delta flight, departing Sun, Feb 8 from Great Falls to Guam, returning Thu, Feb 26, priced at $1,907 found 5 hours ago
Delta
Wed, May 20 - Sun, Jun 7
GTF
Great Falls
GUM
Guam
$1,908 Roundtrip, found 20 hours ago
$1,908
Roundtrip
found 20 hours ago
Select Delta flight, departing Wed, May 20 from Great Falls to Guam, returning Sun, Jun 7, priced at $1,908 found 20 hours ago
Delta
Sun, Feb 8 - Thu, Feb 26
GTF
Great Falls
GUM
Guam
$1,910 Roundtrip, found 5 hours ago
$1,910
Roundtrip
found 5 hours ago
Select Delta flight, departing Sun, Feb 8 from Great Falls to Guam, returning Thu, Feb 26, priced at $1,910 found 5 hours ago
Alaska Airlines
Thu, May 14 - Thu, Jun 4
GTF
Great Falls
GUM
Guam
$1,915 Roundtrip, found 20 hours ago
$1,915
Roundtrip
found 20 hours ago
Select Alaska Airlines flight, departing Thu, May 14 from Great Falls to Guam, returning Thu, Jun 4, priced at $1,915 found 20 hours ago
United
Tue, May 12 - Mon, May 25
GTF
Great Falls
GUM
Guam
$1,932 Roundtrip, found 20 hours ago
$1,932
Roundtrip
found 20 hours ago
Select United flight, departing Tue, May 12 from Great Falls to Guam, returning Mon, May 25, priced at $1,932 found 20 hours ago

Frequently asked questions

How much does a flight from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM) cost?
Snag a cheap one-way flight from $1,400 or cheap return flight from $1,790 from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM)?
April is the cheapest month to fly from GTF to GUM. Timing your trip outside of the busy season is often the key to finding better fares.
What is the cheapest airline that flies from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from GTF to GUM. Then, sort your results by "Price (lowest to highest)" to snag a good deal.
How many flights per day from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM)?
Nonstop flights from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from GTF to GUM?
Generally you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can vary based on the time of year, airline and other factors.*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 A.B. Won Pat Intl. Airport (GUM)?
Book a flight from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM) that leaves before 3 PM to reduce the likelihood of delays. Departures after this time are on average 22% more likely to be 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 A.B. Won Pat Intl. Airport (GUM) last-minute?
Last-minute fares from GTF to GUM are usually more expensive. To secure the cheapest rates, start looking for flights as early as possible. That said, if you can play around with your travel dates, you may score a cheap ticket right before you leave.
Is it cheaper to book a GTF to GUM flight and hotel package?
Compared with arranging flights and hotels separately, booking a GTF to GUM flight and hotel package with Expedia could result in significant savings. Better still, having everything in one easy place will take the stress out of planning your trip. Simply pick your flights and select from our extensive range of hotels, then customize your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from Great Falls Intl. Airport (GTF) to A.B. Won Pat Intl. Airport (GUM)?
In most instances, you can reschedule or cancel your GTF to GUM flight. However, there may be additional fees, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you want more details, head to our Customer Service portal.

Travel information

Origin airport
Great Falls Intl.
Destination airport
A.B. Won Pat Intl.
Airlines serving
Delta, United
Roundtrip price
$1,790
Distance
6159 mi

Book with confidence

Great Falls to Guam Flights

The cheapest times to fly from Great Falls to Guam

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 Guam are during the month of April. You can find some of the cheapest flights from Great Falls to Guam with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Great Falls to Guam: 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 Guam

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 Guam in 2025. You can also book with separate airlines for your outbound and return journeys, from $1,400 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 Guam 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 Guam 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.

 

Great Falls to Guam Flights
*Available to One Key members.