$138 Cheap Flights from Harrisburg (MDT) to Trenton (TTN)

View $138 flight on Sat, Jul 26, 2025Opens in a new window

Popular airlines from Harrisburg Intl. Airport (MDT) to Trenton–Mercer Airport (TTN)

Cheap Flights from Harrisburg to Trenton (MDT-TTN)

Prices were available within the past 7 days and start at $138 for one-way flights and $260 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Jul 12 - Fri, Jul 25
MDT
Harrisburg
TTN
Trenton
$260 Roundtrip, found 2 hours ago
$260
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sat, Jul 12 from Harrisburg to Trenton, returning Fri, Jul 25, priced at $260 found 2 hours ago
Frontier Airlines
Sat, Jul 19 - Fri, Jul 25
MDT
Harrisburg
TTN
Trenton
$265 Roundtrip, found 11 hours ago
$265
Roundtrip
found 11 hours ago
Select Frontier Airlines flight, departing Sat, Jul 19 from Harrisburg to Trenton, returning Fri, Jul 25, priced at $265 found 11 hours ago
Frontier Airlines
Sat, Jul 19 - Fri, Jul 25
MDT
Harrisburg
TTN
Trenton
$275 Roundtrip, found 2 hours ago
$275
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sat, Jul 19 from Harrisburg to Trenton, returning Fri, Jul 25, priced at $275 found 2 hours ago
Frontier Airlines
Sun, Jul 20 - Fri, Jul 25
MDT
Harrisburg
TTN
Trenton
$350 Roundtrip, found 2 hours ago
$350
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sun, Jul 20 from Harrisburg to Trenton, returning Fri, Jul 25, priced at $350 found 2 hours ago
Frontier Airlines
Sun, Jul 13 - Fri, Jul 25
MDT
Harrisburg
TTN
Trenton
$360 Roundtrip, found 2 hours ago
$360
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sun, Jul 13 from Harrisburg to Trenton, returning Fri, Jul 25, priced at $360 found 2 hours ago
Flights from Harrisburg (MDT) to Trenton (TTN)
Origin airport
Harrisburg Intl.
Destination airport
Mercer
Airlines serving
Frontier Airlines
Roundtrip price
$260
Distance
102 mi

Harrisburg to Trenton Flights

The cheapest times to fly from Harrisburg 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 Harrisburg to Trenton are during the month of July. You can find some of the cheapest flights from Harrisburg to Trenton with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Harrisburg to Trenton

Sunday is one of the best days to book for cheap flights from Harrisburg 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 Harrisburg 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 Harrisburg to Trenton in 2025. You can also book with separate airlines for your outbound and return journeys, from $138 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 Harrisburg 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 Harrisburg 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 Harrisburg Intl. Airport (MDT) to Mercer Airport (TTN) cost?
Discover the latest flight deals from MDT to TTN by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from MDT to TTN?
The cheapest flights from MDT to TTN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from MDT to TTN?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from MDT to TTN. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Harrisburg Intl. Airport (MDT) to Mercer Airport (TTN)?
You'll need to take a flight with a layover if you're traveling from Harrisburg Intl. Airport (MDT) to Mercer Airport (TTN). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from MDT to TTN?
Usually you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* But this can change depending on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Harrisburg Intl. Airport (MDT) to Mercer Airport (TTN)?
To land at Mercer Airport (TTN) without delays, opt for a flight that leaves from Harrisburg Intl. Airport (MDT) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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.
What airports do you fly into for Trenton from Harrisburg Intl. Airport (MDT)?
Explore your flight options from Harrisburg Intl. Airport (MDT) to Philadelphia Intl. Airport (PHL). This is the only airport in Trenton you can jet into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Harrisburg Intl. Airport (MDT) to Mercer Airport (TTN) last-minute?
Last-minute bookings from MDT to TTN are generally more expensive. To secure the lowest rates, start searching for flights early. That said, if you're flexible with your travel dates, you may score a cheap ticket right before you leave.
Is it cheaper to book a MDT to TTN flight and hotel package?
Compared with arranging flights and hotels separately, booking a MDT to TTN flight and hotel package with Expedia could result in significant savings. Better yet, managing everything in one place will take the hassle out of travel planning. Simply secure your flights and select from our wide range of stays, then personalize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Harrisburg Intl. Airport (MDT) to Mercer Airport (TTN)?
In most instances, you can cancel or modify your MDT to TTN flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you want further information, visit our Customer Service portal.

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*Available to One Key members.