$545 Cheap Flights from Seattle (SEA) to Newcastle (NTL)

View $545 flight on Sun, Feb 15, 2026Opens in a new window

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

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Cheap Flights from Seattle to Newcastle (SEA-NTL)

Prices were available within the past 7 days and start at $545 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL) cost?
Grab a cheap one-way flight from $545 or cheap return flight from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL)?
The cheapest month to fly from SEA to NTL is , when demand is low. Off-peak months are generally when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL)?
To find the cheapest airline that'll fly you from SEA to NTL, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL)?
Nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to NTL?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary based on various factors, such as 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 Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL)?
To land at Williamtown Airport (NTL) on time, book a flight that leaves from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL) last-minute?
Last-minute bookings from SEA to NTL are usually more expensive. To secure the best rates, start searching for flights early. That being said, if you're flexible with your travel plans, you may score a cheap fare right before your journey.
Is it cheaper to book a SEA to NTL flight and hotel package?
You'll typically save money by securing a SEA to NTL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. Once you've chosen your preferred accommodations and flights, consider adding extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Williamtown Airport (NTL)?
You can usually cancel or reschedule your SEA to NTL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Williamtown
Distance
7667 mi

Book with confidence

Book with confidence

Seattle to Newcastle Flights

The cheapest times to fly from Seattle to Newcastle

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

 

The best time to book a flight from Seattle to Newcastle

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

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 Seattle to Newcastle in 2025. You can also book with separate airlines for your outbound and return journeys, from $545 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 Seattle to Newcastle 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 Seattle to Newcastle 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.

 

Seattle to Newcastle Flights

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