Cheap Frontier Airlines flights Trenton (TTN) to San Diego (SAN)

Scoring cheap one-way Frontier Airlines flights from TTN to SAN on Expedia is a breeze — just filter by “Price (lowest to highest).” Alternatively, check out our affordable round-trip fares for your next exciting vacation.**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 one-way or return flights to San Diego in January or November. You could find a cheap fare with Frontier Airlines during these off-peak times.

Begin your search one to three months before your departure to score cheap fares on Frontier Airlines flights from Mercer Airport (TTN) to San Diego Intl. Airport (SAN). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut 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 the timing right, and you can enjoy significant savings on domestic journeys.*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 figure out if there’s a direct route from TTN to SAN with Frontier Airlines or any other airlines, check the “Nonstop” box when looking for flights.

Sort your results by “Early Morning” and “Morning” to find the earliest flights from TTN to SAN. Setting off early means flight 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.

Hop on a Frontier Airlines flight from Mercer Airport (TTN) to San Diego, and you’re most likely to land at San Diego Intl. Airport (SAN). This is the airline’s primary hub in this destination.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to travel from TTN to SAN with Frontier Airlines. Plus, by joining Expedia’s free One Key™ program, you can receive OneKeyCash™* in addition to any airline 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.

Depending on your ticket type, a fee is typically charged if you change or cancel your booking more than 24 hours after it’s confirmed. To secure plane tickets with more flexibility, select our “No cancel fee” or “Changes included” filter when you search for flights. For additional information on modifying or canceling your reservation, go to “Trips,” select your flight and click on “Manage Booking.”