To save on the cost of your flight from Montana to Guam, book at least 56 days before your planned departure. Booking around this time can save you about 28% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $1,878 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $2,255.
Due to multiple factors, expect to potentially pay more when booking in February. For low rates, March can be a great choice for travel to Guam. Flights to Guam from Montana in March are about $1,872 on average during March, but can be found for as low as $1,018.