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$1,679+ Cheap flights from Seattle (SEA) to Newcastle (NTL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — NTL
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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1. Tell us where you want to go

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Cheap flight deals from Seattle to Newcastle

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Newcastle (NTL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 28, 2025.

Most accurate provider

Expedia
2 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$1,679
(Qantas Airways)

Popular in

December

Cheapest in

August

Average price

$964
Provider with most accurate pricing for Seattle/Tacoma Intl-Newcastle Williamtown flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Newcastle Williamtown flights.
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From Seattle/Tacoma Intl to Newcastle Williamtown
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($151 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Seattle to Newcastle

Best flights from Seattle to Newcastle
Discover carefully curated flight deals from Seattle to Newcastle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 28, 2025.

This Qantas Airways deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/196:05 amSEA - NTL
2 stops35h 10mQantas Airways
Thu 4/236:00 amNTL - SEA
2 stops33h 49mQantas Airways
Deal found 10/25$1,679

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Newcastle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 28, 2025.
Use the filters below to find and compare flights from Seattle to Newcastle that are best for you.

Fly from

Seattle

Fly to

Newcastle

Route

Depart

Return

Price

SeattleNewcastle

SEA - NTL

SEANTL

Seattle/Tacoma Intl

Sun 4/19

6:05 am-10:15 am

2 stops35h 10m

Newcastle Williamtown

Thu 4/23

6:00 am-10:49 pm

2 stops33h 49m

$1,679

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

  • Most accurate provider: When it comes to deals on Seattle-Newcastle flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Seattle-Newcastle flight deals on Cheapflights vs. Expedia 90-95% of the time. Price accuracy is based on data collected from Seattle-Newcastle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Newcastle flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Newcastle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Newcastle

Have a flexible travel schedule? Discover the best time to fly to Newcastle from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Newcastle

What is the cheapest month to book a flight from Seattle to Newcastle?

Currently, July is the cheapest month in which you can book a flight from Seattle to Newcastle (average of $543). Flying from Seattle to Newcastle in January is currently the most expensive (average of $852). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Newcastle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Newcastle?

    A quick flight from Seattle to Newcastle can take about 35h 10m. Qantas Airways provides one of the quickest options available for as low as $1,679. The distance from Seattle to Newcastle is about 7662 mi.

  • Can I find deals for flights from Seattle to Newcastle that include hotel bookings?

    Yes. In addition to deals on Seattle to Newcastle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Newcastle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Newcastle.

  • Can I find deals for business class flights from Seattle to Newcastle?

    Yes. Cheapflights offers flight deals from Seattle to Newcastle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Newcastle?

    Currently, July is the cheapest month in which you can book a flight from Seattle to Newcastle (average of $543). Flying from Seattle to Newcastle in January is currently the most expensive (average of $852). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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