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$405+ 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Jan 29 — Feb 51
Thu 1/29
Thu 2/5
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 December 30, 2025.

This Gotogate deal was found by Cheapflights users on 12/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 pmSEA - BNE
2 stops24h 25mMultiple Airlines
Thu 1/89:05 amBNE - SEA
2 stops28h 11mMultiple Airlines
Deal found 12/29$901
This United Airlines deal was found by Cheapflights users on 12/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:05 amSEA - MEL
1 stop31h 55mUnited Airlines
Sun 1/111:00 pmMEL - SEA
1 stop24h 27mUnited Airlines
Deal found 12/28$1,004
This United Airlines deal was found by Cheapflights users on 12/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:35 pmSEA - BNE
1 stop24h 55mUnited Airlines
Thu 1/811:40 amBNE - SEA
1 stop22h 04mUnited Airlines
Deal found 12/28$1,008
This United Airlines deal was found by Cheapflights users on 12/30. 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.
Tue 12/307:12 pmSEA - MEL
1 stop19h 48mUnited Airlines
Mon 2/211:30 amMEL - SEA
2 stops28h 42mUnited Airlines
Deal found 12/30$1,012
This Air Canada deal was found by Cheapflights users on 12/28. 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.
Wed 12/313:40 pmSEA - SYD
1 stop22h 55mAir Canada
Tue 2/1011:20 amSYD - SEA
1 stop22h 11mAir Canada
Deal found 12/28$1,130
This Gotogate deal was found by Cheapflights users on 12/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:00 pmSEA - SYD
1 stop39h 55mAir Canada
Mon 1/124:00 pmSYD - SEA
1 stop17h 31mAir Canada
Deal found 12/27$1,294
This oojo deal was found by Cheapflights users on 12/30. 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.
Tue 12/303:49 pmSEA - MEL
2 stops44h 21mCathay Pacific
Mon 2/23:35 pmMEL - SEA
2 stops41h 43mCathay Pacific
Deal found 12/30$1,319
This Delta deal was found by Cheapflights users on 12/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:35 amSEA - MEL
2 stops27h 25mDelta
Sun 1/1110:10 amMEL - SEA
2 stops27h 19mDelta
Deal found 12/28$1,322
This FlightHub deal was found by Cheapflights users on 12/27. 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.
Mon 12/298:00 pmSEA - SYD
2 stops27h 40mMultiple Airlines
Mon 1/127:15 pmSYD - SEA
2 stops45h 51mMultiple Airlines
Deal found 12/27$1,421
This Expedia deal was found by Cheapflights users on 12/29. 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.
Tue 12/308:00 pmSEA - SYD
2 stops24h 15mMultiple Airlines
Mon 1/57:15 pmSYD - SEA
2 stops33h 00mMultiple Airlines
Deal found 12/29$1,542
This United Airlines deal was found by Cheapflights users on 12/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/287:12 pmSEA - SYD
1 stop19h 03mUnited Airlines
Wed 1/72:00 pmSYD - SEA
1 stop23h 27mUnited Airlines
Deal found 12/28$1,554
This Delta deal was found by Cheapflights users on 12/29. 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.
Tue 12/301:45 pmSEA - SYD
1 stop22h 05mDelta
Tue 1/610:40 amSYD - SEA
2 stops24h 58mDelta
Deal found 12/29$1,559

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 December 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$780
(Expedia)

One-way from

$405
(Air Canada)

Popular in

December

Cheapest in

August

Average price

$1,565
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 ($194 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 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 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 December 30, 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

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 2/13

3:40 pm-8:45 am

1 stop23h 05m

Brisbane

Fri 2/20

6:10 am-9:15 am

2 stops21h 05m

$851

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 1/25

5:10 pm-7:30 am

1 stop20h 20m

Brisbane

Sun 2/1

11:40 am-11:30 am

1 stop17h 50m

$870

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 1/26

12:35 pm-7:30 am

1 stop24h 55m

Brisbane

Fri 1/30

11:40 am-11:29 am

1 stop17h 49m

$870

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 2/10

8:40 am-7:30 am

2 stops28h 50m

Brisbane

Fri 2/27

11:40 am-9:12 pm

2 stops27h 32m

$874

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 1/10

5:00 am-7:30 am

2 stops32h 30m

Brisbane

Tue 1/13

11:40 am-11:32 am

2 stops41h 52m

$874

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 2/6

12:25 pm-7:30 am

2 stops25h 05m

Brisbane

Thu 2/19

11:40 am-6:03 pm

2 stops24h 23m

$874

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 1/26

12:25 pm-7:30 am

2 stops25h 05m

Brisbane

Mon 2/2

11:40 am-3:44 pm

1 stop22h 04m

$874

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 1/25

10:58 am-7:30 am

2 stops26h 32m

Brisbane

Sat 1/31

11:40 am-6:14 pm

2 stops24h 34m

$874

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 3/31

11:59 pm-6:30 am

2 stops37h 31m

Brisbane

Fri 4/10

10:30 am-2:36 pm

1 stop21h 06m

$874

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 2/13

5:00 am-7:30 am

2 stops32h 30m

Brisbane

Mon 2/23

11:40 am-9:49 am

2 stops40h 09m

$874

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

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, July is the cheapest month in which you can book a flight from Seattle to Australia (average of $518). Flying from Seattle to Australia in December is currently the most expensive (average of $851). 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 December 30, 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
11,583 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

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
8.0
Very good
11,583 reviews
Alaska Airlines
8.0
Very good
11,583 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

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
8,013 reviews
Alaska Airlines
8.0
Very good
11,583 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

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
957 reviews
Alaska Airlines
8.0
Very good
11,583 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

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
9,124 reviews
Alaska Airlines
8.0
Very good
11,583 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

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
10,571 reviews
Alaska Airlines
8.0
Very good
11,583 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

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?

    United Airlines, Qantas Airways, and Cathay Pacific can get you from Seattle to Australia in just under 19h 35m. Your travel time can differ by up to 18h 30m. 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 - 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, July is the cheapest month in which you can book a flight from Seattle to Australia (average of $518). Flying from Seattle to Australia in December is currently the most expensive (average of $851). 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 December 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,406FlexibilityNo cancel feeOn-time75%
ANACheapest$583Average$615FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$647Average$1,253FlexibilityNo cancel feeOn-time74%
Philippine AirlinesCheapest$758Average$880FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$779Average$1,097FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$804Average$976FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$812Average$1,162FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$830Average$1,327FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,193FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,265Average$1,490FlexibilityNo cancel feeOn-time81%

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