We've gone through them all to help you find the right flight for you. If you can't find what you're looking for, consider widening your search by looking at flights from a different airport.
But when you fly is just as important as where you fly from. Search by month to find out when flights are at the priciest and their cheapest.
Last-minute deals can be cheaper, but it's risky. It's best to book flights to Butte in advance to avoid disappointment.
Once you’ve chosen your flight, why not check out our deals on accommodation and car hire? You’ll find lots of hotels in the USA, including some close to the airport – perfect if you're arriving late or leaving early.