$124 Cheap Flights from Trenton (TTN) to Seattle (SEA)

View $124 flight on Sat, Jan 17, 2026Opens in a new window

Popular airlines from Trenton–Mercer Airport (TTN) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Trenton to Seattle (TTN-SEA)

Prices were available within the past 7 days and start at $124 for one-way flights and $237 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Feb 26 - Wed, Mar 4
TTN
Trenton
SEA
Seattle
$237 Roundtrip, found 6 hours ago
$237
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Thu, Feb 26 from Trenton to Seattle, returning Wed, Mar 4, priced at $237 found 6 hours ago
American Airlines
Sat, Feb 14 - Wed, Feb 18
TTN
Trenton
SEA
Seattle
$247 Roundtrip, found 2 days ago
$247
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Feb 14 from Trenton to Seattle, returning Wed, Feb 18, priced at $247 found 2 days ago
American Airlines
Fri, Feb 20 - Mon, Feb 23
TTN
Trenton
SEA
Seattle
$252 Roundtrip, found 3 days ago
$252
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Feb 20 from Trenton to Seattle, returning Mon, Feb 23, priced at $252 found 3 days ago
American Airlines
Sat, Feb 7 - Sat, Feb 14
TTN
Trenton
SEA
Seattle
$257 Roundtrip, found 2 days ago
$257
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Feb 7 from Trenton to Seattle, returning Sat, Feb 14, priced at $257 found 2 days ago
American Airlines
Thu, Feb 12 - Sun, Feb 15
TTN
Trenton
SEA
Seattle
$272 Roundtrip, found 6 days ago
$272
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Feb 12 from Trenton to Seattle, returning Sun, Feb 15, priced at $272 found 6 days ago
American Airlines
Tue, Feb 24 - Thu, Feb 26
TTN
Trenton
SEA
Seattle
$277 Roundtrip, found 21 hours ago
$277
Roundtrip
found 21 hours ago
Select American Airlines flight, departing Tue, Feb 24 from Trenton to Seattle, returning Thu, Feb 26, priced at $277 found 21 hours ago
American Airlines
Sat, Feb 14 - Wed, Feb 18
TTN
Trenton
SEA
Seattle
$287 Roundtrip, found 2 days ago
$287
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Feb 14 from Trenton to Seattle, returning Wed, Feb 18, priced at $287 found 2 days ago
American Airlines
Fri, Feb 20 - Sun, Feb 22
TTN
Trenton
SEA
Seattle
$292 Roundtrip, found 3 days ago
$292
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Feb 20 from Trenton to Seattle, returning Sun, Feb 22, priced at $292 found 3 days ago
American Airlines
Mon, Mar 9 - Wed, Mar 11
TTN
Trenton
SEA
Seattle
$297 Roundtrip, found 21 hours ago
$297
Roundtrip
found 21 hours ago
Select American Airlines flight, departing Mon, Mar 9 from Trenton to Seattle, returning Wed, Mar 11, priced at $297 found 21 hours ago
American Airlines
Wed, Feb 11 - Sun, Feb 15
TTN
Trenton
SEA
Seattle
$302 Roundtrip, found 8 hours ago
$302
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Wed, Feb 11 from Trenton to Seattle, returning Sun, Feb 15, priced at $302 found 8 hours ago

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Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $257
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $257
Flights from Trenton (TTN) to Seattle (SEA)
Origin airport
Mercer
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines
Roundtrip price
$236
Distance
2378 mi

Trenton to Seattle Flights

The cheapest times to fly from Trenton to Seattle

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

 

The best time to book a flight from Trenton to Seattle

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

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 Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $124 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 Seattle 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 Seattle 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 Seattle - Tacoma Intl. Airport (SEA) cost?
Snag a cheap one-way flight from $124 or cheap return flight from $237 from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA)?
February is the least expensive month to fly from TTN to SEA. Timing your trip outside of the busy season is often the key to better flight prices.
Which airlines fly direct from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA)?
There are no direct routes from Trenton, NJ (TTN-Mercer) to Seattle - Tacoma Intl. Airport (SEA). However, there are other airports that offer nonstop flights. Board your plane at Liberty Intl. Airport (EWR) and head straight to Seattle without layovers.
What is the cheapest airline that flies from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from TTN to SEA, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA)?
There are no daily nonstop flights from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA). 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 TTN to SEA?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the time of year, carrier 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 Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA)?
Select a flight from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until right before your break to book a flight from TTN to SEA often results in higher prices. While you might find some last-minute offers, they aren't always guaranteed. Allow some flexibility in your schedule for the best chance of landing a bargain.
Is it cheaper to book a TTN to SEA flight and hotel package?
Booking a TTN to SEA flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Select from our impressive range of accommodations and then add flights, car rentals and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Mercer Airport (TTN) to Seattle - Tacoma Intl. Airport (SEA)?
In most cases, you're able to cancel or reschedule your TTN to SEA flight. However, additional fees may apply, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you need further information, visit our Customer Service portal.

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*Available to One Key members.