Find cheap flights from Boston to Sidney from $847

In the last 3 days, the lowest price for a flight from Boston to Sidney, Montana was $847 for a round-trip ticket.

No, a passport isn't needed to fly from Boston to Sidney. However, local authorities might ask for an official ID.

We unfortunately don’t have that data for this specific route.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Sidney.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sidney from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sidney with an airline and back to Boston with another airline. Booking your flights between Boston and SDY can sometimes prove cheaper using this method.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sidney from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.