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$393+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Apr 27 — May 41
Mon 4/27
Mon 5/4
1 adult, Economy
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Cheap 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 March 28, 2026.

This Trip.com deal was found by Cheapflights users on 3/28. 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.
Wed 5/1311:06 am
SEA
-
SYD
2 stops31h 44m
Multiple Airlines
Wed 5/271:20 pm
SYD
-
SEA
3 stops37h 46m
Multiple Airlines
Deal found 3/28$907
This Air Canada deal was found by Cheapflights users on 3/28. 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.
Tue 5/1210:45 am
SEA
-
BNE
1 stop27h 20m
Air Canada
Tue 5/1910:15 am
BNE
-
SEA
1 stop21h 05m
Air Canada
Deal found 3/28$914
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/198:00 pm
SEA
-
SYD
1 stop18h 20m
Air Canada
Tue 5/59:20 am
SYD
-
SEA
1 stop17h 45m
Air Canada
Deal found 3/26$916
This Air Canada deal was found by Cheapflights users on 3/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1910:20 am
SEA
-
SYD
1 stop28h 00m
Air Canada
Mon 5/119:20 am
SYD
-
SEA
1 stop26h 10m
Air Canada
Deal found 3/27$929
This Air Canada deal was found by Cheapflights users on 3/24. 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 5/62:55 pm
SEA
-
SYD
1 stop23h 25m
Air Canada
Wed 5/279:20 am
SYD
-
SEA
1 stop17h 45m
Air Canada
Deal found 3/24$930
This FlightHub deal was found by Cheapflights users on 3/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/105:50 am
SEA
-
SYD
1 stop32h 30m
Air Canada
Tue 6/29:20 am
SYD
-
SEA
1 stop30h 23m
Air Canada
Deal found 3/25$940
This Air Canada deal was found by Cheapflights users on 3/28. 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.
Tue 5/122:55 pm
SEA
-
BNE
1 stop23h 10m
Multiple Airlines
Tue 5/198:40 pm
BNE
-
SEA
2 stops30h 25m
Multiple Airlines
Deal found 3/28$943
This Air Canada deal was found by Cheapflights users on 3/24. 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.
Tue 4/2810:20 am
SEA
-
BNE
1 stop27h 45m
Multiple Airlines
Sun 5/108:40 pm
BNE
-
SEA
2 stops30h 25m
Multiple Airlines
Deal found 3/24$948
This Air Canada deal was found by Cheapflights users on 3/26. 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.
Wed 5/62:55 pm
SEA
-
SYD
1 stop23h 25m
Multiple Airlines
Wed 5/276:00 am
SYD
-
SEA
2 stops21h 05m
Multiple Airlines
Deal found 3/26$949
This Air Canada deal was found by Cheapflights users on 3/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/198:00 pm
SEA
-
SYD
2 stops22h 25m
Multiple Airlines
Mon 5/119:20 am
SYD
-
SEA
1 stop26h 10m
Multiple Airlines
Deal found 3/27$955
This Air Canada deal was found by Cheapflights users on 3/26. 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.
Fri 5/152:55 pm
SEA
-
BNE
1 stop23h 10m
Air Canada
Tue 5/2610:15 am
BNE
-
SEA
1 stop21h 05m
Air Canada
Deal found 3/26$955
This Air Canada deal was found by Cheapflights users on 3/24. 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.
Tue 5/1210:45 am
SEA
-
SYD
1 stop27h 35m
Air Canada
Tue 5/197:00 am
SYD
-
SEA
2 stops20h 05m
Air Canada
Deal found 3/24$956

Find flight deals from Seattle to Australia

Keep the following information in mind while searching for Seattle to Australia flight deals. Data was last updated March 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$916
(Expedia)

One-way from

$393
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,014
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 Australia
Search Deals
One-way flight from Seattle/Tacoma Intl to Australia
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($189 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 28, 2026.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

9:50 am-6:50 am

2 stops28h 00m

Sydney Kingsford Smith

Mon 5/4

9:15 am-2:51 pm

1 stop22h 36m

$984

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

11:10 am-6:50 am

2 stops26h 40m

Sydney Kingsford Smith

Thu 5/14

9:15 am-3:23 pm

2 stops23h 08m

$1,018

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 4/18

11:10 am-6:50 am

2 stops26h 40m

Sydney Kingsford Smith

Mon 5/11

9:15 am-10:03 pm

2 stops29h 48m

$1,019

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/26

5:35 pm-6:50 am

1 stop20h 15m

Sydney Kingsford Smith

Thu 6/11

9:15 am-11:59 pm

1 stop31h 44m

$1,021

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 4/25

3:40 pm-4:40 pm

2 stops32h 30m

Adelaide

Tue 4/28

8:00 pm-9:38 am

2 stops30h 08m

$1,057

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 5/9

7:20 pm-6:10 pm

2 stops30h 20m

Adelaide

Sat 5/16

5:15 pm-10:05 am

2 stops33h 20m

$1,065

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 4/19

8:00 pm-2:20 pm

2 stops25h 20m

Melbourne

Sun 4/26

8:45 pm-9:38 am

2 stops29h 53m

$1,109

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Thu 5/7

1:34 pm-11:40 am

2 stops29h 06m

Cairns

Thu 5/14

12:40 pm-7:16 pm

2 stops23h 36m

$1,192

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

7:05 pm-7:00 am

2 stops42h 55m

Sydney Kingsford Smith

Mon 5/4

9:30 am-11:29 pm

3 stops30h 59m

$1,223

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 5/7

8:38 am-7:00 am

3 stops29h 22m

Sydney Kingsford Smith

Thu 5/14

10:20 am-10:43 am

1 stop17h 23m

$1,225

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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, January is the cheapest month in which you can book a flight from Seattle to Australia (average of $426). Flying from Seattle to Australia 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.

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 March 28, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andQantas 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
7.9
Good
12,134 reviews

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
7.9
Good
12,134 reviews
Alaska Airlines
7.9
Good
12,134 reviews

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,359 reviews
Alaska Airlines
7.9
Good
12,134 reviews

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Qantas Airways
7.5
Good
1,013 reviews
Alaska Airlines
7.9
Good
12,134 reviews

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,508 reviews
Alaska Airlines
7.9
Good
12,134 reviews

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Air Canada
7.1
Good
10,856 reviews
Alaska Airlines
7.9
Good
12,134 reviews

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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?

    Delta, United Airlines, and Qantas Airways can get you from Seattle to Australia in just under 27h 45m. Your travel time can differ by up to 15h 10m. The distance from Seattle to Australia is about 8180 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?

    $253 is the cheapest one-way deal found within the past few days, from ANA. You may also be able to find cheap deals on Air Canada and Qantas Airways, with prices starting from $366 and $380, 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, January is the cheapest month in which you can book a flight from Seattle to Australia (average of $426). Flying from Seattle to Australia 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.

See more FAQs

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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 March 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,404FlexibilityNo cancel feeOn-time75%
DeltaCheapest$237Average$1,404FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$385Average$1,119FlexibilityNo cancel feeOn-time67%
ANACheapest$583Average$655FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$647Average$1,260FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,033FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$812Average$1,159FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$833Average$1,390FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$1,126Average$1,268FlexibilityNo cancel feeOn-timeN/A
Cathay PacificCheapest$1,153Average$1,271FlexibilityNo cancel feeOn-time72%

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