$299 Cheap Flights from Ontario (ONT) to Trenton (TTN)

View $299 flight on Mon, Sep 22, 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Trenton–Mercer Airport (TTN)

Cheap Flights from Ontario to Trenton (ONT-TTN)

Prices were available within the past 7 days and start at $299 for one-way flights and $555 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Nov 12 - Sat, Nov 22
ONT
Ontario
TTN
Trenton
$555 Roundtrip, found 7 hours ago
$555
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Nov 12 from Ontario to Trenton, returning Sat, Nov 22, priced at $555 found 7 hours ago
American Airlines
Wed, Nov 12 - Sat, Nov 22
ONT
Ontario
TTN
Trenton
$559 Roundtrip, found 7 hours ago
$559
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Nov 12 from Ontario to Trenton, returning Sat, Nov 22, priced at $559 found 7 hours ago
American Airlines
Wed, Nov 12 - Sat, Nov 22
ONT
Ontario
TTN
Trenton
$562 Roundtrip, found 7 hours ago
$562
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Nov 12 from Ontario to Trenton, returning Sat, Nov 22, priced at $562 found 7 hours ago
American Airlines
Wed, Oct 15 - Wed, Oct 22
ONT
Ontario
TTN
Trenton
$568 Roundtrip, found 5 days ago
$568
Roundtrip
found 5 days ago
Select American Airlines flight, departing Wed, Oct 15 from Ontario to Trenton, returning Wed, Oct 22, priced at $568 found 5 days ago
American Airlines
Wed, Oct 15 - Wed, Oct 22
ONT
Ontario
TTN
Trenton
$572 Roundtrip, found 1 day ago
$572
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Oct 15 from Ontario to Trenton, returning Wed, Oct 22, priced at $572 found 1 day ago
American Airlines
Wed, Oct 15 - Wed, Oct 22
ONT
Ontario
TTN
Trenton
$574 Roundtrip, found 1 day ago
$574
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Oct 15 from Ontario to Trenton, returning Wed, Oct 22, priced at $574 found 1 day ago
American Airlines
Wed, Oct 15 - Wed, Oct 22
ONT
Ontario
TTN
Trenton
$575 Roundtrip, found 2 days ago
$575
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Oct 15 from Ontario to Trenton, returning Wed, Oct 22, priced at $575 found 2 days ago
American Airlines
Thu, Dec 4 - Sat, Jan 3
ONT
Ontario
TTN
Trenton
$583 Roundtrip, found 2 days ago
$583
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Dec 4 from Ontario to Trenton, returning Sat, Jan 3, priced at $583 found 2 days ago
American Airlines
Thu, Dec 4 - Sat, Jan 3
ONT
Ontario
TTN
Trenton
$592 Roundtrip, found 2 days ago
$592
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Dec 4 from Ontario to Trenton, returning Sat, Jan 3, priced at $592 found 2 days ago
American Airlines
Wed, Oct 15 - Wed, Oct 22
ONT
Ontario
TTN
Trenton
$594 Roundtrip, found 6 days ago
$594
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Oct 15 from Ontario to Trenton, returning Wed, Oct 22, priced at $594 found 6 days ago
Flights from Ontario (ONT) to Trenton (TTN)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Mercer
Airlines serving
American Airlines
Roundtrip price
$554
Distance
2370 mi

Ontario to Trenton Flights

The cheapest times to fly from Ontario to Trenton

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Trenton are during the month of November. You can find some of the cheapest flights from Ontario to Trenton with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Trenton

Sunday is one of the best days to book for cheap flights from Ontario to Trenton: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario to Trenton

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Trenton in 2025. You can also book with separate airlines for your outbound and return journeys, from $299 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Trenton flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Trenton airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN) cost?
Get a cheap one-way flight from $299 or cheap return flight from $555 from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN)?
Flying in November may help you find better deals, as it's the cheapest month for flights between ONT and TTN. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from ONT to TTN. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN)?
There aren't any daily nonstop flights available from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN). But you can opt for flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from ONT to TTN?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a number of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN)?
To avoid potential delays on the Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN) route, travel before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN) last-minute?
Last-minute fares from ONT to TTN are generally more expensive. For the best rates, start looking for flights well ahead of time. That being said, if your travel plans are flexible, it's possible to find a cheap ticket right before your journey.
Is it cheaper to book an ONT to TTN flight and hotel package?
Compared with arranging hotels and flights separately, booking an ONT to TTN flight and hotel package with Expedia could lead to significant savings. What's more, managing everything in one place will take the hassle out of planning your trip. Just pick your flights and choose from our wide range of stays, then personalize your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Mercer Airport (TTN)?
It's usually possible to reschedule or cancel your ONT to TTN flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.