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$445+ 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Dec 15 — Dec 221
Mon 12/15
Mon 12/22
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 November 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$826
(Air Canada)

One-way from

$445
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$960
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. 14% potential increase in price ($174 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 15, 2025.

This Air Canada deal was found by Cheapflights users on 11/14. 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.
Wed 11/198:00 pmSEA - BNE
1 stop18h 45mMultiple Airlines
Sun 12/76:30 pmBNE - SEA
2 stops33h 01mMultiple Airlines
Deal found 11/14$849
This Air Canada deal was found by Cheapflights users on 11/13. 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.
Tue 12/28:00 pmSEA - BNE
1 stop18h 45mMultiple Airlines
Fri 12/126:10 amBNE - SEA
2 stops21h 21mMultiple Airlines
Deal found 11/13$852
This United Airlines deal was found by Cheapflights users on 11/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/235:20 pmSEA - BNE
1 stop20h 10mUnited Airlines
Wed 12/1011:40 amBNE - SEA
1 stop27h 20mUnited Airlines
Deal found 11/14$867
This United Airlines deal was found by Cheapflights users on 11/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/285:20 pmSEA - BNE
1 stop20h 10mUnited Airlines
Thu 12/411:40 amBNE - SEA
2 stops24h 45mUnited Airlines
Deal found 11/14$871
This Air Canada deal was found by Cheapflights users on 11/13. 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.
Thu 11/278:00 pmSEA - BNE
1 stop18h 45mMultiple Airlines
Sun 11/306:30 pmBNE - SEA
2 stops33h 01mMultiple Airlines
Deal found 11/13$877
This United Airlines deal was found by Cheapflights users on 11/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:13 pmSEA - BNE
2 stops42h 17mUnited Airlines
Thu 12/411:40 amBNE - SEA
1 stop18h 38mUnited Airlines
Deal found 11/14$885
This Air Canada deal was found by Cheapflights users on 11/14. 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.
Sun 11/235:50 amSEA - BNE
2 stops39h 40mAir Canada
Fri 12/510:45 amBNE - SEA
1 stop16h 46mAir Canada
Deal found 11/14$931
This Air Canada deal was found by Cheapflights users on 11/14. 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.
Fri 11/213:40 pmSEA - BNE
1 stop23h 05mAir Canada
Thu 12/410:45 amBNE - SEA
1 stop21h 46mAir Canada
Deal found 11/14$942
This Orbitz deal was found by Cheapflights users on 11/13. 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.
Thu 12/113:40 pmSEA - BNE
1 stop23h 05mAir Canada
Thu 12/1810:45 amBNE - SEA
1 stop21h 46mAir Canada
Deal found 11/13$970
This Air Canada deal was found by Cheapflights users on 11/13. 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.
Sat 11/153:40 pmSEA - BNE
1 stop23h 05mAir Canada
Tue 11/2510:45 amBNE - SEA
1 stop16h 46mAir Canada
Deal found 11/13$974
This Qantas Airways deal was found by Cheapflights users on 11/14. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:59 pmSEA - SYD
1 stop21h 26mQantas Airways
Tue 12/97:05 amSYD - SEA
2 stops30h 15mQantas Airways
Deal found 11/14$988
This Air Canada deal was found by Cheapflights users on 11/13. 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.
Sat 11/158:00 pmSEA - BNE
1 stop18h 45mMultiple Airlines
Tue 11/256:10 amBNE - SEA
2 stops21h 21mMultiple Airlines
Deal found 11/13$992

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 November 15, 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

Tue 2/3

5:10 pm-7:30 am

1 stop20h 20m

Brisbane

Sat 2/14

11:40 am-9:01 pm

1 stop27h 21m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 2/6

5:45 pm-8:20 am

1 stop20h 35m

Brisbane

Sun 2/15

10:40 am-6:43 pm

1 stop26h 03m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 11/20

3:37 pm-7:30 am

1 stop21h 53m

Brisbane

Fri 12/5

11:40 am-9:00 pm

1 stop27h 20m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 11/18

2:40 pm-7:30 am

1 stop22h 50m

Brisbane

Wed 12/10

11:40 am-3:29 pm

1 stop21h 49m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 11/18

1:20 pm-7:30 am

1 stop24h 10m

Brisbane

Mon 12/8

11:40 am-9:00 pm

1 stop27h 20m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 11/28

2:40 pm-7:30 am

1 stop22h 50m

Brisbane

Thu 12/4

11:40 am-12:18 pm

1 stop18h 38m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 1/31

12:35 pm-7:30 am

1 stop24h 55m

Brisbane

Wed 2/11

11:40 am-6:28 pm

1 stop24h 48m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 11/27

9:25 am-7:30 am

1 stop28h 05m

Brisbane

Fri 12/5

11:40 am-6:32 pm

1 stop24h 52m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 11/18

2:40 pm-7:30 am

1 stop22h 50m

Brisbane

Fri 12/5

11:40 am-3:29 pm

1 stop21h 49m

$867

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 2/5

7:30 pm-7:30 am

1 stop18h 00m

Brisbane

Tue 2/10

11:40 am-11:30 am

1 stop17h 50m

$867

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/13

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 $535). 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.

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 November 15, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 32% on flights from Seattle to Australia by exploring options for tickets at noon.

What is the cheapest day to fly from Seattle to Australia?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Australia flight should consider departing on Friday at noon when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 November 15, 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
11,293 reviews

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

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
11,293 reviews
Alaska Airlines
8.0
Very good
11,293 reviews

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

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
7.9
Good
8,011 reviews
Alaska Airlines
8.0
Very good
11,293 reviews

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

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
934 reviews
Alaska Airlines
8.0
Very good
11,293 reviews

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

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
9,017 reviews
Alaska Airlines
8.0
Very good
11,293 reviews

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

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
10,450 reviews
Alaska Airlines
8.0
Very good
11,293 reviews

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

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?

    United Airlines, Delta, and Alaska Airlines can get you from Seattle to Australia in just under 17h 45m. Your travel time can differ by up to 2h 50m. 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?

    $445 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Delta and Air Canada, with prices starting from $445 and $569, 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 $535). 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.

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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 November 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$583Average$615FlexibilityNo cancel feeOn-time80%
Alaska AirlinesCheapest$591Average$1,399FlexibilityNo cancel feeOn-time75%
Qantas AirwaysCheapest$647Average$1,254FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$779Average$1,116FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$804Average$1,194FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$820Average$1,143FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$832Average$1,315FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,073FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,239Average$1,483FlexibilityNo cancel feeOn-time81%
Qatar AirwaysCheapest$1,307Average$1,499FlexibilityNo cancel feeOn-time68%

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