$665 Cheap Flights from Newcastle (NTL) to Seattle (SEA)

View $665 flight on Wed, Apr 8, 2026Opens in a new window

Popular airlines from Newcastle, NSW (NTL-Williamtown) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Newcastle to Seattle (NTL-SEA)

Prices were available within the past 7 days and start at $665 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Flights from Newcastle (NTL) to Seattle (SEA)
Origin airport
Williamtown
Destination airport
Seattle - Tacoma Intl.
Distance
7667 mi

Newcastle to Seattle Flights

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

 

The best time to book a flight from Newcastle to Seattle

Sunday is one of the best days to book for cheap flights from Newcastle 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 Newcastle 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 Newcastle to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $665 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 Newcastle 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 Newcastle 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 Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA) cost?
Grab a cheap one-way flight from $665 or cheap return flight from Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA) 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 Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from NTL to SEA is , when there's less demand. Off-peak season is often when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from NTL to SEA, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA)?
You'll need to take a flight with a layover if you're traveling from Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from NTL to SEA?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary based 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 Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA)?
Book a flight from Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA) that takes off before 3 PM to reduce the risk of cancellations. Later departures are on average 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 Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your plane ticket from NTL to SEA shortly before your getaway is typically more expensive. However, if there's some wiggle room with your schedule, you could land a cheap last-minute fare.
Is it cheaper to book a NTL to SEA flight and hotel package?
Booking a NTL to SEA flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Choose from our impressive range of stays and then add car rentals, activities and flights 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 Williamtown Airport (NTL) to Seattle - Tacoma Intl. Airport (SEA)?
In most cases, you're able to cancel or reschedule your NTL to SEA flight. However, there may be additional charges, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you need further information, go to our Customer Service portal.

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*Available to One Key members.