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New South Wales

$379+ Cheap flights from Seattle (SEA) to New South Wales

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Jan 2 — Jan 91
Fri 1/2
Fri 1/9
1 adult, Economy
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Cheap flight deals from Seattle to New South Wales

Cheapest flights from Seattle to New South Wales
Explore the most affordable flight options available from Seattle to New South Wales. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 3, 2025.

This Air Canada deal was found by Cheapflights users on 12/3. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:40 pmSEA - SYD
1 stop22h 55mAir Canada
Tue 2/1011:20 amSYD - SEA
1 stop26h 56mAir Canada
Deal found 12/3$910
This oojo deal was found by Cheapflights users on 12/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:25 amSEA - SYD
1 stop31h 35mQantas Airways
Tue 1/207:05 amSYD - SEA
2 stops24h 24mQantas Airways
Deal found 12/2$989
This Justfly.com deal was found by Cheapflights users on 12/2. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amSEA - SYD
1 stop32h 00mQantas Airways
Tue 2/107:15 pmSYD - SEA
2 stops41h 50mQantas Airways
Deal found 12/2$1,005
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:59 pmSEA - SYD
2 stops23h 31mQantas Airways
Tue 1/209:25 pmSYD - SEA
1 stop18h 09mQantas Airways
Deal found 12/2$1,116
This Orbitz deal was found by Cheapflights users on 12/1. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/210:05 amSEA - SYD
1 stop25h 50mMultiple Airlines
Tue 12/97:15 pmSYD - SEA
2 stops33h 16mMultiple Airlines
Deal found 12/1$1,120
This Qantas Airways deal was found by Cheapflights users on 12/2. 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 12/32:59 pmSEA - SYD
2 stops23h 51mQantas Airways
Thu 1/229:55 pmSYD - SEA
2 stops43h 51mQantas Airways
Deal found 12/2$1,133
This Qantas Airways deal was found by Cheapflights users on 12/2. 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 12/36:05 amSEA - SYD
2 stops33h 15mQantas Airways
Sun 1/187:05 amSYD - SEA
2 stops24h 24mQantas Airways
Deal found 12/2$1,138
This Qantas Airways deal was found by Cheapflights users on 12/2. 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 12/32:59 pmSEA - SYD
2 stops27h 56mQantas Airways
Sat 1/179:55 pmSYD - SEA
2 stops33h 34mQantas Airways
Deal found 12/2$1,140
This Qantas Airways deal was found by Cheapflights users on 12/2. 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 12/32:59 pmSEA - SYD
2 stops23h 21mQantas Airways
Wed 1/215:30 pmSYD - SEA
2 stops37h 59mQantas Airways
Deal found 12/2$1,141
This Qantas Airways deal was found by Cheapflights users on 12/2. 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 12/246:00 amSEA - OOL
2 stops43h 45mQantas Airways
Wed 1/146:00 amOOL - SEA
2 stops30h 05mQantas Airways
Deal found 12/2$1,757
This United Airlines deal was found by Cheapflights users on 12/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/285:00 amSEA - OOL
2 stops33h 40mUnited Airlines
Sun 1/119:20 amOOL - SEA
2 stops27h 07mUnited Airlines
Deal found 12/2$1,761
This United Airlines deal was found by Cheapflights users on 12/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/285:00 amSEA - OOL
2 stops33h 40mUnited Airlines
Fri 1/97:20 amOOL - SEA
2 stops27h 09mUnited Airlines
Deal found 12/2$1,811

Find flight deals from Seattle to New South Wales

Keep the following information in mind while searching for Seattle to New South Wales flight deals. Data was last updated December 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$901
(FlightHub)

One-way from

$379
(SmartFares)

Popular in

December

Cheapest in

August

Average price

$1,395
Provider with most accurate pricing for Seattle/Tacoma Intl-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sydney Kingsford Smith flights.
Search Deals
From Seattle/Tacoma Intl to New South Wales
Search Deals
One-way flight from Seattle/Tacoma Intl to New South Wales
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($174 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to New South Wales 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 December 3, 2025.
Use the filters below to find and compare flights from Seattle to New South Wales that are best for you.

Fly from

Seattle

Fly to

New South Wales

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 2/2

5:12 pm-9:05 am

1 stop20h 53m

Sydney Kingsford Smith

Sun 2/15

11:50 am-6:03 pm

2 stops25h 13m

$1,112

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/1

7:30 pm-9:15 am

1 stop18h 45m

Sydney Kingsford Smith

Tue 2/17

11:50 am-6:03 pm

2 stops25h 13m

$1,112

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 2/5

6:00 am-7:25 am

1 stop30h 25m

Sydney Kingsford Smith

Sun 2/15

11:20 am-6:53 pm

1 stop26h 33m

$1,156

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 1/6

5:25 am-6:50 am

2 stops30h 25m

Sydney Kingsford Smith

Tue 1/27

10:40 am-3:00 pm

2 stops23h 20m

$1,166

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 12/31

9:35 am-8:30 am

2 stops27h 55m

Sydney Kingsford Smith

Tue 2/10

10:40 am-4:55 pm

2 stops25h 15m

$1,166

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Sat 2/28

6:04 pm-9:45 am

2 stops45h 41m

Coolangatta Gold Coast

Thu 3/12

7:55 am-4:14 pm

2 stops25h 19m

$1,194

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 1/23

12:35 pm-9:15 am

1 stop25h 40m

Sydney Kingsford Smith

Sat 1/31

12:10 pm-11:30 am

1 stop18h 20m

$1,211

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/7

12:59 pm-8:45 am

2 stops24h 46m

Sydney Kingsford Smith

Sat 2/14

1:55 pm-9:01 pm

3 stops26h 06m

$1,246

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 1/1

5:25 am-6:50 am

2 stops30h 25m

Sydney Kingsford Smith

Fri 2/6

10:40 am-12:33 pm

2 stops20h 53m

$1,266

SeattleNewcastle

SEA - NTL

SEANTL

Seattle/Tacoma Intl

Fri 2/27

6:01 am-3:45 pm

2 stops38h 44m

Newcastle Williamtown

Tue 3/3

6:10 am-6:57 pm

2 stops31h 47m

$1,371

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 29 results
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Best time to book a flight from Seattle to New South Wales

Have a flexible travel schedule? Discover the best time to fly to New South Wales 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 New South Wales

What is the cheapest month to book a flight from Seattle to New South Wales?

Currently, July is the cheapest month in which you can book a flight from Seattle to New South Wales (average of $535). Flying from Seattle to New South Wales 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.

What is the cheapest time of day to fly from SEA to NSW?

Find hourly flight availability from Seattle to New South Wales. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 3, 2025.

It’s optimal to fly from Seattle to New South Wales in the evening. By choosing this option you can save up to 16% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Seattle to New South Wales?

Use this chart to determine the cheapest time to fly round-trip from Seattle to New South Wales. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to New South Wales flight should consider departing on Tuesday evenings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing New South Wales

Get insights into the airlines that provide service to New South Wales. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to New South Wales. Reviews last updated December 3, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Qantas Airways from Seattle to New South Wales to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,390 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,390 reviews
Alaska Airlines
8.0
Very good
11,390 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,390 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Qantas Airways
7.5
Good
947 reviews
Alaska Airlines
8.0
Very good
11,390 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
9,064 reviews
Alaska Airlines
8.0
Very good
11,390 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,497 reviews
Alaska Airlines
8.0
Very good
11,390 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

Related info for your journey

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

  • What airport do you fly from for flights from Seattle to New South Wales?

    For a flight from Seattle to New South Wales, you will be flying from Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city.

  • How long is the flight from Seattle to New South Wales?

    There are many flights that can get you from Seattle to New South Wales in 20h 53m. Fly via United Airlines, Qantas Airways, or Delta to get the fastest option. The distance between Seattle and New South Wales is about 7744 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Seattle to New South Wales one-way?

    The cheapest airline one-way is ANA, with whom users have recently found tickets for as low as $253. However, be on the lookout for offers from Air Canada and Qantas Airways, as they are both options that can get you from Seattle to New South Wales for a low price.

  • What are the most popular routes from Seattle to New South Wales?

    The most popular flight routes from Seattle to New South Wales are Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Coolangatta Gold Coast and Seattle/Tacoma Intl - Dubbo.

  • Can I find deals for flights from Seattle to New South Wales that include hotel bookings?

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

  • How can I find direct flights from Seattle to New South Wales?

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

  • Can I find deals for business class flights from Seattle to New South Wales?

    Yes. Cheapflights offers flight deals from Seattle to New South Wales 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 New South Wales?

    Currently, July is the cheapest month in which you can book a flight from Seattle to New South Wales (average of $535). Flying from Seattle to New South Wales 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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Top 9 airlines flying from Seattle to New South Wales

Discover the top 9 airlines that operate flights from Seattle to New South Wales. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$583Average$615FlexibilityNo cancel feeOn-time80%
Alaska AirlinesCheapest$591Average$1,172FlexibilityNo cancel feeOn-time75%
Philippine AirlinesCheapest$758Average$921FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$779Average$1,051FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$789Average$885FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$976FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$1,155FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$831Average$1,130FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,155FlexibilityNo cancel feeOn-timeN/A

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