$122 Cheap Frontier Airlines flights Chicago (ORD) to Trenton (TTN)

Landing cheap one-way Frontier Airlines flights from ORD to TTN from $122 on Expedia is a breeze --- just filter by "Price (lowest to highest)." Alternatively, check out our affordable return fares from $221 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.

To find cheap Frontier Airlines fares from O'Hare Intl. Airport (ORD) to Mercer Airport (TTN), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact the overall cost. Sunday tends to be the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey on a Sunday.**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.

Find Frontier Airlines's earliest flights from ORD to TTN by using our "Morning" and "Early Morning" filters. Not only will you get to your destination sooner, early departures are also 20% less likely to be canceled.**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.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to leave from ORD to TTN with Frontier Airlines. Plus, when you sign up to our One Key™ program, you can receive OneKeyCash™* on top of any airline loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.