$81 Cheap Spirit Airlines flights Austin (AUS) to Boston (BOS)

Finding cheap one-way Spirit Airlines flights from AUS to BOS from $81 on Expedia is a breeze --- just filter by "Price (lowest to highest)." Or check out our affordable round-trip fares from $139 for your next getaway.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Start searching one to three months ahead of your departure date to find cheap fares on Spirit Airlines flights from Austin-Bergstrom Intl. Airport (AUS) to Logan Intl. Airport (BOS). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

To find the earliest departures from AUS to BOS with Spirit Airlines, filter your search by "Morning" and "Early Morning." Booking an early flight usually means cancellations are less likely.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.

Fly from AUS to BOS with Spirit Airlines and you can look forward to a range of benefits including a rewarding loyalty program. When booking through Expedia as a Free Spirit and One Key™ member, you can also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.