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$1,635+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — NTL
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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Cheap flight deals from Seattle to Newcastle

Cheapest flights from Seattle to Newcastle
Explore the most affordable flight options available from Seattle to Newcastle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 27, 2026.

This Qantas Airways deal was found by Cheapflights users on 1/25. 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.
Wed 5/134:12 pm
SEA
-
NTL
2 stops35h 33m
Qantas Airways
Sun 5/173:40 pm
NTL
-
SEA
2 stops48h 09m
Qantas Airways
Deal found 1/25$1,635

Find 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 January 27, 2026.

Most accurate provider

Expedia
1 star

Most trusted provider

Expedia
3 stars

Round-trip from

$1,635
(Qantas Airways)
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
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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 January 27, 2026.
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

Wed 5/13

4:12 pm-8:45 pm

2 stops35h 33m

Newcastle Williamtown

Sun 5/17

3:40 pm-10:49 pm

2 stops48h 09m

$1,635

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/24

  • 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% 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 $513). Flying from Seattle to Newcastle in December is currently the most expensive (average of $845). 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 33m. Qantas Airways provides one of the quickest options available for as low as $1,635. 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 $513). Flying from Seattle to Newcastle in December is currently the most expensive (average of $845). 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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