769 € Return - Cheap flights to Philadelphia Trenton-Mercer Airport

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Flexible on travel dates? Find the cheapest month – or even day – to fly to Philadelphia Trenton-Mercer.

Frequently asked questions

Currently, there are no airlines that fly direct to Philadelphia Trenton-Mercer. But we found flights with one or more stops from 769 €.
The cheapest month to fly to Philadelphia Trenton-Mercer is usually June.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Philadelphia Trenton-Mercer but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
No airlines currently offer direct flights between Ireland and Philadelphia Trenton-Mercer Airport. Most routes have one or more stops.
The best price we found for a return flight to Philadelphia Trenton-Mercer is 769 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
We found flights to Philadelphia International Airport, which is 11.2 km from Philadelphia, from 411 €.
After crunching the numbers on our flight calendar, we found that the cheapest date to fly to Philadelphia Trenton-Mercer Airport is Friday, 19 June 2026.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Philadelphia is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Air Transat offers the cheapest flight tickets to Philadelphia Trenton-Mercer.

Flying to Philadelphia Trenton-Mercer

The things to know before you go.
Cheapest flight found388 €
Cheapest month to flyMay

Discover Philadelphia Trenton-Mercer

How to find cheap flights to Trenton-Mercer Airport (TTN)

  • 769 € is currently the cheapest price for a round-trip flight to Trenton-Mercer Airport. For a one-way plane ticket to TTN, the lowest fare is 388 €.

  • Get updates on fares by setting up a Price Alert. The moment prices on tickets to TTN fall, you'll get a notification.

  • Lock in a bargain on tickets to Philadelphia, where Trenton-Mercer Airport is located, by booking ahead of time. You're more likely to secure an amazing deal and have a wider range of flights and departure times.

  • Expand your search for cheap flights to Philadelphia by clicking the 'Add nearby airports' option. This allows you to compare prices for all the airports closest to your departure and destination points and could help keep costs down.

  • Consider taking a flight with a stop, as indirect routes can often save you money. Just uncheck the 'Direct flights' box when searching for your plane tickets to Trenton-Mercer Airport.

Best time to go to Philadelphia

  • You can usually jump on the cheapest flight to Philadelphia in May.

  • If you can be flexible with your dates, try using the 'Whole month' tool. It'll show you the cheapest month, and even day of the year, for flights to TTN.

  • Fly to Philadelphia in August if you want to be there when it's busy. This is the most popular month for flights to TTN, but also when fares are likely to cost more.

  • April is the quietest time of year to visit if you're after a slower pace. You'll generally find cheaper prices on plane tickets to Philadelphia then.

  • With averages of between 18ºC (64ºF) and 32ºC (90ºF), July is when Philadelphia is at its warmest. Organise your visit around your preferred weather conditions to get the most out of your trip.

  • Temperatures are lowest in January, when they range from -7ºC (19ºF) to 9ºC (48ºF).

  • Don't want to pack a raincoat? November is the driest month in Philadelphia, averaging five days of rain.

  • The wettest time of year is July. Travel then and you'll likely get around ten days of rainfall.

Travelling to Trenton-Mercer Airport (TTN): What you need to know

  • Reach Philadelphia faster with a direct Frontier Airlines flight to Trenton-Mercer Airport.

  • If you want to travel with the most consistently on-time carrier, book your TTN plane ticket with Frontier Airlines. Up to 84% of its flights into this airport arrive according to schedule.

  • You'll be touching down in the UTC-4 timezone at TTN.

  • Crawl into bed shortly after your flight to TTN. Book a room at one of these stays close to Trenton-Mercer Airport and you'll be fast asleep before you know it:

  • Kick off your Philadelphia break sooner by collecting a car hire in TTN. Budget, National and Enterprise are well-known providers to select from here.

  • If you have a connection from Trenton-Mercer Airport or travelling home from there, your journey is likely to stay on schedule. Up to 82% of all flights out of TTN land when they're supposed to.

  • Trenton-Mercer Airport is located in Philadelphia, Pennsylvania, the United States.

Getting to central Philadelphia from Trenton-Mercer Airport (TTN)

Philadelphia highlights

  • Put these popular sights high on your must-see list after stepping off your flight to Philadelphia:

    • Independence Hall: Offering a memorable introduction to the city's highlights, this landmark is around 2 kilometres east of the centre.

    • 18th Century Garden of the Independence National Historic Park: Find a spot to sit and take five here while exploring Philadelphia. This park is roughly 2 kilometres east of the centre.

    • Philadelphia Museum of Art: This also makes for a worthwhile detour. A top landmark, it's around 2 kilometres north-west of the centre of Philadelphia.

How to get to Allentown from Trenton-Mercer Airport (TTN)

  • TTN is a gateway to the nearby city of Allentown, which is around 64 kilometres away. The easiest way to reach the centre will depend on when you're travelling, so check your options first.

Travelling from Trenton-Mercer Airport (TTN) to Edison

  • Edison is about 40 kilometres from Trenton-Mercer Airport if you're going in that direction.

Explore more of the United States

  • There's a whole lot more of the United States begging to be explored. Around 80 kilometres north-east of Philadelphia, set off for New York. What not to miss? Start with Central Park, Manhattan Skyline and Statue of Liberty. The most conveniently located airport for this city is John F. Kennedy International Airport (JFK).

  • Another city in the United States that will quickly win you over is Baltimore. From Philadelphia, it's roughly 193 kilometres south-west and offers top sights like Baltimore Aquarium and National Aquarium. Swing by Washington Monument and Mount Vernon Place too.

  • Make room for new experiences in Washington DC, which is roughly 241 kilometres south-west of Philadelphia. Smithsonian, Lincoln Memorial and The White House are reasons to visit. You can get here by catching a flight to Ronald Reagan National Airport (DCA).

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.