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$367+ Cheap flights from Seattle (SEA) to Australia

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 11/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
oct. 29 — nov. 51
mié. 10/29
mié. 11/5
1 adult, Economy
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Cheap flight deals from Seattle to Australia

Keep the following information in mind while searching for Seattle to Australia flight deals. Data was last updated septiembre 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$820
(Air Canada)

One-way from

$367
(Air Canada)

Popular in

January

Cheapest in

September

Average price

$915
Provider with most accurate pricing for Seattle/Tacoma Intl-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sydney Kingsford Smith flights.
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From Seattle/Tacoma Intl to Australia
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One-way flight from Seattle/Tacoma Intl to Australia
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Highest demand for flights based on searches. 9% potential increase in price ($112 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Seattle to Australia

Cheapest flights from Seattle to Australia
Explore the most affordable flight options available from Seattle to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 29, 2025.

This Air Canada deal was found by Cheapflights users on 9/26. 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.
mar. 11/113:40 pmSEA - MEL
2 stops28h 05mAir Canada
mar. 11/187:45 amMEL - SEA
2 stops20h 46mAir Canada
Deal found 9/26$820
This Priceline deal was found by Cheapflights users on 9/26. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/115:30 pmSEA - SYD
1 stop20h 30mQantas Airways
mar. 11/1811:20 amSYD - SEA
1 stop20h 42mQantas Airways
Deal found 9/26$826
This Qantas Airways deal was found by Cheapflights users on 9/27. 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.
mié. 12/35:59 pmSEA - SYD
1 stop20h 01mQantas Airways
mié. 1/215:45 pmSYD - SEA
1 stop21h 10mQantas Airways
Deal found 9/27$827
This Alaska Airlines deal was found by Cheapflights users on 9/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/207:44 amSEA - SYD
1 stop18h 01mAlaska Airlines
mar. 11/49:40 pmSYD - SEA
1 stop26h 55mAlaska Airlines
Deal found 9/27$828
This Trip.com deal was found by Cheapflights users on 9/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/15:30 pmSEA - SYD
1 stop21h 30mMultiple Airlines
vie. 11/215:45 pmSYD - SEA
1 stop21h 38mMultiple Airlines
Deal found 9/26$837
This United Airlines deal was found by Cheapflights users on 9/26. 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.
dom. 11/212:00 pmSEA - SYD
2 stops26h 05mUnited Airlines
dom. 11/1611:50 amSYD - SEA
1 stop29h 56mUnited Airlines
Deal found 9/26$844
This Alaska Airlines deal was found by Cheapflights users on 9/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/194:45 pmSEA - SYD
1 stop33h 00mAlaska Airlines
dom. 10/269:40 pmSYD - SEA
2 stops27h 29mAlaska Airlines
Deal found 9/27$845
This Delta deal was found by Cheapflights users on 9/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/911:15 amSEA - SYD
2 stops26h 15mDelta
jue. 11/2710:40 amSYD - SEA
2 stops26h 59mDelta
Deal found 9/26$849
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
vie. 10/244:30 pmSEA - SYD
1 stop21h 35mMultiple Airlines
vie. 10/319:25 pmSYD - SEA
1 stop18h 35mMultiple Airlines
Deal found 9/27$855
This FlightHub deal was found by Cheapflights users on 9/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/146:20 amSEA - SYD
1 stop30h 05mQantas Airways
vie. 11/2811:20 amSYD - SEA
1 stop28h 03mQantas Airways
Deal found 9/27$864
This Trip.com deal was found by Cheapflights users on 9/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/116:50 pmSEA - SYD
1 stop19h 10mMultiple Airlines
mar. 11/1811:20 amSYD - SEA
1 stop20h 42mMultiple Airlines
Deal found 9/27$865
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
lun. 11/34:30 pmSEA - SYD
1 stop19h 55mMultiple Airlines
dom. 11/169:25 pmSYD - SEA
1 stop20h 41mMultiple Airlines
Deal found 9/27$869

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Australia 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 septiembre 29, 2025.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Seattle

Fly to

Australia

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

dom. 10/19

8:45 pm-7:45 pm

1 stop29h 00m

Sydney Kingsford Smith

dom. 10/26

9:40 pm-6:34 am

1 stop26h 54m

$845

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

sáb. 11/15

8:00 pm-8:45 am

1 stop18h 45m

Brisbane

mar. 11/25

6:35 am-2:31 pm

2 stops25h 56m

$935

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

dom. 3/15

8:00 pm-2:00 pm

2 stops25h 00m

Cairns

jue. 3/19

6:00 am-3:01 pm

2 stops26h 01m

$968

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

vie. 2/13

8:45 am-9:30 am

1 stop29h 45m

Melbourne

dom. 3/1

1:00 pm-6:26 pm

1 stop24h 26m

$1,015

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

lun. 12/8

5:05 pm-9:30 am

1 stop21h 25m

Melbourne

lun. 12/22

11:30 am-9:07 pm

2 stops28h 37m

$1,015

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

jue. 12/4

7:29 pm-10:00 am

1 stop19h 31m

Melbourne

lun. 12/22

11:30 am-9:07 pm

2 stops28h 37m

$1,015

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

mié. 2/11

12:24 pm-9:30 am

1 stop26h 06m

Melbourne

dom. 2/22

11:30 am-9:01 pm

2 stops28h 31m

$1,015

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

lun. 3/2

7:29 pm-10:00 am

1 stop19h 31m

Melbourne

jue. 3/12

10:30 am-9:29 pm

2 stops28h 59m

$1,015

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

sáb. 12/13

2:52 pm-10:00 am

1 stop24h 08m

Melbourne

sáb. 12/27

11:30 am-9:17 pm

2 stops28h 47m

$1,015

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

jue. 1/29

7:30 pm-10:00 am

1 stop19h 30m

Melbourne

jue. 2/26

11:30 am-9:01 pm

2 stops28h 31m

$1,015

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/26

Showing 1-10 of 60 results
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Best time to book a flight from Seattle to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia 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 Australia

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

Currently, March is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,032). Flying from Seattle to Australia in December is currently the most expensive (average of $1,626). 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 AU?

Find hourly flight availability from Seattle to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Australia as you normally would.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated septiembre 29, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Qantas Airways from Seattle to Australia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

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
8.0
Very good
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

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
910 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

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
8,924 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

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 Australia. 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 Australia?

    If you book a flight to Australia from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle.

  • How long is the flight from Seattle to Australia?

    Alaska Airlines, Air Canada, and United Airlines can get you from Seattle to Australia in just under 18h 45m. Your travel time can differ by up to 11h. The distance from Seattle to Australia is about 7346 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Seattle to Australia one-way?

    $381 is the cheapest one-way deal found within the past few days, from Qantas Airways. You may also be able to find cheap deals on Philippine Airlines and Air Canada, with prices starting from $396 and $401, respectively.

  • What are the most popular routes from Seattle to Australia?

    The most popular flight routes from Seattle to Australia are Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Melbourne and Seattle/Tacoma Intl - Brisbane.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Australia 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 Australia?

    Currently, March is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,032). Flying from Seattle to Australia in December is currently the most expensive (average of $1,626). 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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Alternative routes for Seattle to Australia

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Top 10 airlines flying from Seattle to Australia

Discover the top 10 airlines that operate flights from Seattle to Australia. 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 septiembre 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$591Average$1,163FlexibilityNo cancel feeOn-time75%
Qantas AirwaysCheapest$647Average$1,221FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$780Average$1,167FlexibilityNo cancel feeOn-time67%
ANACheapest$794Average$1,048FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$804Average$1,022FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$820Average$1,158FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$833Average$1,299FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,060FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,218Average$1,491FlexibilityNo cancel feeOn-time81%
Qatar AirwaysCheapest$1,315Average$1,535FlexibilityNo cancel feeOn-time68%

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