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$454+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
May 17 — May 241
Sun 5/17
Sun 5/24
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 April 17, 2026.

This Jetabroad deal was found by Cheapflights users on 4/16. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/111:55 pm
SEA
-
SYD
1 stop38h 50m
Philippine Airlines
Mon 11/3011:35 am
SYD
-
SEA
1 stop26h 00m
Philippine Airlines
Deal found 4/16$692
This FlightHub deal was found by Cheapflights users on 4/16. 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.
Fri 9/411:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Sun 9/1310:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 4/16$885
This Trip.com deal was found by Cheapflights users on 4/15. 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 5/2711:21 am
SEA
-
SYD
2 stops31h 29m
Multiple Airlines
Wed 6/31:20 pm
SYD
-
SEA
3 stops37h 46m
Multiple Airlines
Deal found 4/15$947
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:10 am
SEA
-
SYD
1 stop31h 55m
American Airlines
Sun 5/2412:00 pm
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 4/16$970
This American Airlines deal was found by Cheapflights users on 4/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/311:41 am
SEA
-
SYD
2 stops26h 24m
American Airlines
Sun 5/179:10 am
SYD
-
SEA
1 stop25h 57m
American Airlines
Deal found 4/12$973
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/22:20 pm
SEA
-
SYD
1 stop24h 10m
American Airlines
Wed 8/199:10 am
SYD
-
SEA
1 stop18h 45m
American Airlines
Deal found 4/14$978
This Delta deal was found by Cheapflights users on 4/12. 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.
Mon 5/113:00 pm
SEA
-
SYD
1 stop22h 50m
Delta
Wed 5/279:15 am
SYD
-
SEA
1 stop24h 38m
Delta
Deal found 4/12$981
This American Airlines deal was found by Cheapflights users on 4/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:57 pm
SEA
-
SYD
2 stops23h 08m
American Airlines
Sun 5/3112:00 pm
SYD
-
SEA
1 stop24h 17m
American Airlines
Deal found 4/13$982
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/182:57 pm
SEA
-
SYD
2 stops23h 08m
American Airlines
Wed 6/312:00 pm
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 4/16$983
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/211:43 am
SEA
-
SYD
1 stop26h 12m
American Airlines
Wed 6/179:10 am
SYD
-
SEA
1 stop29h 39m
American Airlines
Deal found 4/15$985
This Delta deal was found by Cheapflights users on 4/12. 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.
Mon 5/119:25 am
SEA
-
SYD
2 stops28h 25m
Delta
Tue 5/269:15 am
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 4/12$986
This lol.travel deal was found by Cheapflights users on 4/12. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:20 pm
SEA
-
MEL
2 stops23h 00m
Multiple Airlines
Wed 6/176:00 am
MEL
-
SEA
2 stops25h 23m
Multiple Airlines
Deal found 4/12$1,020

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 April 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$885
(FlightHub)

One-way from

$454
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,038
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. 16% potential increase in price ($210 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 17, 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 5/10

9:25 am-6:50 am

2 stops28h 25m

Sydney Kingsford Smith

Sat 6/13

9:15 am-10:19 pm

1 stop30h 04m

$1,026

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 8/1

9:26 am-6:50 am

2 stops28h 24m

Sydney Kingsford Smith

Fri 8/14

9:15 am-4:52 pm

2 stops24h 37m

$1,051

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Tue 5/12

7:20 pm-2:20 pm

2 stops26h 00m

Melbourne Avalon

Tue 5/19

4:40 pm-10:05 am

2 stops34h 25m

$1,067

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

9:50 am-6:50 am

2 stops28h 00m

Sydney Kingsford Smith

Wed 5/13

9:15 am-1:00 pm

2 stops20h 45m

$1,104

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/24

2:40 pm-7:05 am

1 stop23h 25m

Sydney Kingsford Smith

Fri 6/5

9:10 am-9:49 pm

1 stop29h 39m

$1,128

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Mon 7/6

3:00 pm-2:20 pm

2 stops30h 20m

Melbourne Avalon

Fri 7/31

8:55 pm-10:07 am

2 stops30h 12m

$1,164

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Tue 9/1

3:00 pm-2:20 pm

2 stops30h 20m

Melbourne Avalon

Tue 9/15

8:55 pm-2:22 pm

2 stops34h 27m

$1,164

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

10:00 am-6:50 pm

1 stop39h 50m

Sydney Kingsford Smith

Tue 5/12

8:45 pm-6:00 am

1 stop26h 15m

$1,173

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Fri 7/17

9:18 pm-11:40 am

2 stops45h 22m

Cairns

Thu 7/30

12:40 pm-6:10 pm

2 stops22h 30m

$1,174
Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/2

5:59 pm-6:50 am

1 stop19h 51m

Sydney Kingsford Smith

Fri 5/22

9:15 am-10:55 am

1 stop18h 40m

$1,199

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/12

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from Seattle to Australia (average of $97). Flying from Seattle to Australia in March is currently the most expensive (average of $778). 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 April 17, 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
12,251 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

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
12,251 reviews
Alaska Airlines
7.9
Good
12,251 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

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
8,409 reviews
Alaska Airlines
7.9
Good
12,251 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

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
1,019 reviews
Alaska Airlines
7.9
Good
12,251 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

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
9,601 reviews
Alaska Airlines
7.9
Good
12,251 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

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
10,932 reviews
Alaska Airlines
7.9
Good
12,251 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

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, Qantas Airways, and Alaska Airlines can get you from Seattle to Australia in just under 23h 25m. Your travel time can differ by up to 16h 25m. The distance from Seattle to Australia is about 7744 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 - Melbourne, Seattle/Tacoma Intl - Sydney Kingsford Smith and Seattle/Tacoma Intl - Melbourne Avalon.

  • 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 $97). Flying from Seattle to Australia in March is currently the most expensive (average of $778). 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 April 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,401FlexibilityNo cancel feeOn-time75%
DeltaCheapest$237Average$1,460FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$385Average$1,082FlexibilityNo 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$813Average$1,159FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$833Average$1,350FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$947Average$1,220FlexibilityNo cancel feeOn-time78%
Alaska AirlinesCheapest$1,126Average$1,268FlexibilityNo cancel feeOn-timeN/A

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