$363 Cheap Flights from Trenton (TTN) to Washington (IAD)

View $363 flight on Fri, Oct 10, 2025Opens in a new window

Popular airlines from Trenton–Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)

Cheap Flights from Trenton to Washington (TTN-IAD)

Prices were available within the past 7 days and start at $363 for one-way flights and $393 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$393 Roundtrip, found 5 days ago
$393
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $393 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$415 Roundtrip, found 5 days ago
$415
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $415 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$476 Roundtrip, found 5 days ago
$476
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $476 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$487 Roundtrip, found 2 days ago
$487
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $487 found 2 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$492 Roundtrip, found 5 days ago
$492
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $492 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$506 Roundtrip, found 5 days ago
$506
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $506 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$508 Roundtrip, found 2 days ago
$508
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $508 found 2 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$514 Roundtrip, found 5 days ago
$514
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $514 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$528 Roundtrip, found 5 days ago
$528
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $528 found 5 days ago
American Airlines
Thu, Oct 9 - Sat, Oct 11
TTN
Trenton
IAD
Washington
$569 Roundtrip, found 5 days ago
$569
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 9 from Trenton to Washington, returning Sat, Oct 11, priced at $569 found 5 days ago
Flights from Trenton (TTN) to Washington (IAD)
Origin airport
Mercer
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines
Roundtrip price
$392
Distance
167 mi

Trenton to Washington Flights

The cheapest times to fly from Trenton to Washington

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 Trenton to Washington are during the month of October. You can find some of the cheapest flights from Trenton to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Trenton to Washington

Sunday is one of the best days to book for cheap flights from Trenton to Washington: 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 Trenton to Washington

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 Trenton to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $363 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 Trenton to Washington 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 Trenton to Washington 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 Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD) cost?
Secure a cheap one-way flight from $363 or cheap return flight from $393 from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)?
The cheapest month to fly from TTN to IAD is October, when there's less demand. Off-peak months are often when you'll find cheap fares for travel between these airports.
Which airlines fly direct from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)?
While Trenton, NJ (TTN-Mercer) doesn't offer any direct flights to Washington Dulles Intl. Airport (IAD), other airports have nonstop routes. Leaving from Liberty Intl. Airport (EWR) will get you to Washington without any detours.
What is the cheapest airline that flies from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll take you from TTN to IAD. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)?
You'll have to catch a flight with a layover when traveling from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from TTN to IAD?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change depending on a range of factors, including the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)?
To avoid potential delays on the Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD) route, fly before 3 PM. Later flights 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 Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute bookings from TTN to IAD are usually more expensive. To secure the lowest prices, start searching for flights as early as possible. That said, if you can play around with your travel dates, it's possible to land a cheap ticket right before your journey.
Is it cheaper to book a TTN to IAD flight and hotel package?
Compared with arranging flights and hotels separately, booking a TTN to IAD flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one easy place will take the hassle out of planning your trip. Just pick your flights and choose from our wide range of hotels, then tailor your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Mercer Airport (TTN) to Washington Dulles Intl. Airport (IAD)?
In most instances, you can cancel or modify your TTN to IAD flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need further information, visit our Customer Service portal.

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*Available to One Key members.