$104 Cheap Frontier Airlines flights Ontario (ONT) to Austin (AUS)

Finding cheap one-way Frontier Airlines flights from ONT to AUS from $104 on Expedia couldn’t be simpler — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $183 for your next break.**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.

Browse for round-trip or one-way flights to Austin in January or December. You could find cheaper fares with Frontier Airlines during these off-peak times.

Search for cheap Frontier Airlines flights from Los Angeles - Ontario Intl. Airport (ONT) 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. Regardless of fare class and itinerary, the best day 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.

Use our “Nonstop” filter when searching for direct Frontier Airlines flights from ONT to AUS. It’s also an easy way to compare other carriers servicing the same direct trip.

To find the earliest departure from ONT to AUS with Frontier Airlines, sort your results by “Early Morning” and “Morning.” Choosing an early flight generally means you’re less likely to experience 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.

Frontier Airlines flights from Los Angeles - Ontario Intl. Airport (ONT) to Austin land at Austin-Bergstrom Intl. Airport (AUS). This is the main gateway to this destination.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to fly from ONT to AUS with Frontier Airlines. Plus, by joining Expedia’s free One Key™ program, you can receive OneKeyCash™* on top of Frontier Airlines’s loyalty program earnings. It’s yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are generally free within 24 hours of making your booking, but your airline may charge a fee after that. For more information about modifying your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to update your itinerary without additional charges, check the “No cancel fee” or “Changes included” filter when organizing your next break.