$98 Cheap Spirit Airlines flights Boston (BOS) to Austin (AUS)

Make use of the "Price (lowest to highest)" filter on Expedia to look for cheap Spirit Airlines round-trip flights from $178 from BOS to AUS. Affordable one-way fares from $98 are also available.**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.

Look for affordable Spirit Airlines flights from Logan Intl. Airport (BOS) to Austin-Bergstrom Intl. Airport (AUS) one to three months prior to your departure day. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare class and itinerary, the best day of the week to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**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 BOS to AUS with Spirit Airlines, sort your results by "Morning" and "Early Morning." Choosing an early flight usually means you'll experience fewer cancellations.**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.

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