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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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
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 agosto 14, 2025.

Round-trip from

$710
(Air Canada)

One-way from

$367
(Air Canada)

Popular in

December

Cheapest in

February

Average price

$1,083
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. 12% potential increase in price ($164 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 14, 2025.

This Air Canada deal was found by Cheapflights users on 8/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/192:55 pmSEA - SYD
1 stop23h 25mAir Canada
dom. 10/2610:20 amSYD - SEA
1 stop26h 56mAir Canada
Deal found 8/13$710
This Air Canada deal was found by Cheapflights users on 8/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/28:00 pmSEA - SYD
2 stops22h 55mMultiple Airlines
dom. 11/1611:20 amSYD - SEA
1 stop17h 11mMultiple Airlines
Deal found 8/12$747
This Air Canada deal was found by Cheapflights users on 8/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/28:00 pmSEA - SYD
2 stops22h 55mMultiple Airlines
mié. 11/199:00 amSYD - SEA
2 stops19h 31mMultiple Airlines
Deal found 8/12$762
This Air Canada deal was found by Cheapflights users on 8/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/98:00 pmSEA - SYD
2 stops25h 40mMultiple Airlines
dom. 11/168:20 amSYD - SEA
2 stops20h 11mMultiple Airlines
Deal found 8/12$771
This Air Canada deal was found by Cheapflights users on 8/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/83:40 pmSEA - SYD
1 stop22h 55mAir Canada
sáb. 11/1511:20 amSYD - SEA
1 stop22h 06mAir Canada
Deal found 8/14$779
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/228:00 pmSEA - SYD
1 stop18h 35mAir Canada
vie. 11/2811:20 amSYD - SEA
1 stop17h 11mAir Canada
Deal found 8/14$790
This BestPriceTravel deal was found by Cheapflights users on 8/13. 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/133:23 pmSEA - SYD
1 stop22h 42mMultiple Airlines
sáb. 9/205:45 pmSYD - SEA
1 stop19h 39mMultiple Airlines
Deal found 8/13$795
This Orbitz deal was found by Cheapflights users on 8/13. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/298:00 pmSEA - SYD
2 stops30h 40mAir Canada
vie. 11/1411:20 amSYD - SEA
1 stop22h 06mAir Canada
Deal found 8/13$799
This BestPriceTravel deal was found by Cheapflights users on 8/13. 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/113:23 pmSEA - SYD
1 stop23h 07mMultiple Airlines
jue. 9/189:30 pmSYD - SEA
1 stop27h 37mMultiple Airlines
Deal found 8/13$800
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/202:42 pmSEA - SYD
1 stop23h 23mQantas Airways
mar. 11/411:15 amSYD - SEA
1 stop20h 47mQantas Airways
Deal found 8/14$803
This Air Canada deal was found by Cheapflights users on 8/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/58:00 pmSEA - MEL
2 stops23h 45mAir Canada
vie. 4/246:00 amMEL - SEA
2 stops26h 03mAir Canada
Deal found 8/13$818
This FlightHub deal was found by Cheapflights users on 8/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/197:15 pmSEA - MEL
2 stops23h 20mAir Canada
lun. 11/37:30 amMEL - SEA
2 stops21h 01mAir Canada
Deal found 8/13$829

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 agosto 14, 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

2:55 pm-8:20 am

1 stop23h 25m

Sydney Kingsford Smith

lun. 10/27

10:20 am-9:31 am

1 stop17h 11m

$779

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

jue. 10/30

8:00 pm-12:40 pm

2 stops22h 40m

Sydney Kingsford Smith

sáb. 11/8

11:20 am-9:31 am

1 stop17h 11m

$798

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

dom. 10/19

2:55 pm-11:40 am

2 stops26h 45m

Sydney Kingsford Smith

dom. 10/26

10:20 am-2:26 pm

1 stop22h 06m

$798

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mié. 10/1

4:59 pm-7:05 am

1 stop21h 06m

Sydney Kingsford Smith

sáb. 10/11

6:45 pm-11:01 pm

1 stop22h 16m

$804

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

mié. 11/5

8:00 pm-2:45 pm

2 stops23h 45m

Melbourne

vie. 4/24

6:00 am-3:03 pm

2 stops26h 03m

$818

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

jue. 9/11

4:59 pm-7:05 am

1 stop21h 06m

Sydney Kingsford Smith

jue. 9/18

5:45 pm-8:24 pm

1 stop19h 39m

$826

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mar. 9/30

5:59 pm-7:05 am

1 stop20h 06m

Sydney Kingsford Smith

mié. 10/15

6:45 pm-8:25 pm

1 stop19h 40m

$826

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mar. 2/10

3:35 pm-7:25 am

1 stop20h 50m

Sydney Kingsford Smith

mar. 3/10

11:15 am-2:16 pm

1 stop21h 01m

$826

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

lun. 11/10

4:30 pm-9:00 am

1 stop21h 30m

Sydney Kingsford Smith

dom. 11/23

5:45 pm-6:03 pm

1 stop19h 18m

$826

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

sáb. 11/22

3:40 pm-2:45 pm

2 stops28h 05m

Melbourne

vie. 11/28

8:00 am-9:31 am

2 stops20h 31m

$829

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

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, February is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,031). Flying from Seattle to Australia in December is currently the most expensive (average of $1,619). 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 agosto 14, 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 agosto 14, 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

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Qantas Airways
7.5
Good
895 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,916 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Air Canada
7.1
Good
9,949 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

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

    $367 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on Qantas Airways and United Airlines, with prices starting from $373 and $579, 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 - 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, February is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,031). Flying from Seattle to Australia in December is currently the most expensive (average of $1,619). 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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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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$591Average$1,169FlexibilityNo cancel feeOn-time75%
Qantas AirwaysCheapest$647Average$1,246FlexibilityNo cancel feeOn-time74%
ANACheapest$794Average$1,115FlexibilityNo cancel feeOn-time80%
American AirlinesCheapest$807Average$1,153FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$821Average$1,192FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$841Average$1,308FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$858Average$1,156FlexibilityNo cancel feeOn-time85%
DeltaCheapest$862Average$1,137FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,218Average$1,481FlexibilityNo cancel feeOn-time81%
Qatar AirwaysCheapest$1,315Average$1,646FlexibilityNo cancel feeOn-time68%

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