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$472+ 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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$925
(Kiwi.com)

One-way from

$472
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,035
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. 9% potential increase in price ($120 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 26, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/148:40 pmSEA - SYD
1 stop25h 00mMultiple Airlines
Thu 5/294:20 pmSYD - SEA
1 stop30h 55mMultiple Airlines
Deal found 3/25$925
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/911:35 pmSEA - SYD
1 stop39h 25mPhilippine Airlines
Fri 5/1610:10 amSYD - SEA
1 stop26h 05mPhilippine Airlines
Deal found 3/25$1,043
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/162:55 pmSEA - SYD
1 stop23h 25mAir Canada
Sat 8/309:20 amSYD - SEA
1 stop17h 01mAir Canada
Deal found 3/25$1,051
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/261:45 pmSEA - SYD
2 stops26h 40mANA
Tue 9/911:50 amSYD - SEA
2 stops23h 46mANA
Deal found 3/25$1,065
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 5/77:15 pmSEA - MEL
2 stops23h 10mMultiple Airlines
Tue 6/36:00 amMEL - SEA
2 stops20h 18mMultiple Airlines
Deal found 3/24$1,085
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.
Mon 11/37:05 pmSEA - MEL
2 stops23h 30mAir Canada
Mon 11/178:10 amMEL - SEA
2 stops20h 40mAir Canada
Deal found 3/24$1,086
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/125:40 pmSEA - SYD
1 stop20h 15mUnited Airlines
Sun 5/2510:20 amSYD - SEA
1 stop18h 01mUnited Airlines
Deal found 3/25$1,100
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:00 amSEA - ADL
3 stops37h 05mMultiple Airlines
Thu 5/1512:35 pmADL - SEA
3 stops28h 05mMultiple Airlines
Deal found 3/25$1,118
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/711:35 pmSEA - BNE
1 stop41h 20mPhilippine Airlines
Wed 5/1411:15 amBNE - SEA
1 stop25h 00mPhilippine Airlines
Deal found 3/25$1,129
This SmartFares 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/108:15 amSEA - SYD
1 stop18h 30mHawaiian Airlines
Sat 5/179:40 pmSYD - SEA
1 stop25h 35mHawaiian Airlines
Deal found 3/25$1,139
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/168:25 amSEA - SYD
1 stop18h 20mAlaska Airlines
Sat 5/249:40 pmSYD - SEA
1 stop25h 35mAlaska Airlines
Deal found 3/25$1,151
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.
Wed 10/1511:35 pmSEA - MEL
1 stop36h 25mPhilippine Airlines
Wed 10/299:00 amMEL - SEA
1 stop28h 35mPhilippine Airlines
Deal found 3/25$1,153

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 26, 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

Wed 5/14

8:40 pm-2:40 pm

1 stop25h 00m

Sydney Kingsford Smith

Thu 5/29

4:20 pm-6:15 am

1 stop30h 55m

$925

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 5/9

11:35 pm-8:00 am

1 stop39h 25m

Sydney Kingsford Smith

Fri 5/16

10:10 am-7:15 pm

1 stop26h 05m

$1,043

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/5

7:15 pm-7:20 am

1 stop19h 05m

Sydney Kingsford Smith

Tue 6/3

9:20 am-2:13 pm

1 stop21h 53m

$1,051

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 5/7

7:15 pm-11:25 am

2 stops23h 10m

Melbourne

Tue 6/3

6:00 am-9:18 am

2 stops20h 18m

$1,085

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/12

5:40 pm-6:55 am

1 stop20h 15m

Sydney Kingsford Smith

Sun 5/25

10:20 am-11:21 am

1 stop18h 01m

$1,100

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 5/8

6:00 am-11:35 am

3 stops37h 05m

Adelaide

Thu 5/15

12:35 pm-12:10 am

3 stops28h 05m

$1,118

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 5/7

11:35 pm-9:55 am

1 stop41h 20m

Brisbane

Wed 5/14

11:15 am-7:15 pm

1 stop25h 00m

$1,129

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/10

8:15 am-7:45 pm

1 stop18h 30m

Sydney Kingsford Smith

Sat 5/17

9:40 pm-6:15 am

1 stop25h 35m

$1,139

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 5/16

8:25 am-7:45 pm

1 stop18h 20m

Sydney Kingsford Smith

Fri 5/23

9:40 pm-11:33 pm

1 stop18h 53m

$1,151

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Sat 9/6

7:15 pm-11:05 am

2 stops22h 50m

Cairns

Thu 9/11

6:00 am-2:16 pm

2 stops25h 16m

$1,184

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

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, March is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,044). Flying from Seattle to Australia in December is currently the most expensive (average of $1,643). 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 March 26, 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.

Rainfall in Australia by month

Plan your trip to Australia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Australia ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Australia when rainfall is around 2.0 in.

Temperature in Australia by month

Plan your trip to Australia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Australia, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

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 26, 2025.
Read reviews from past customers who have flown Air Tahiti Nui, EVA Air and Japan Airlines from Seattle to Australia. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.7
Very good
61 reviews

Crew

9.1

Food

7.8

Overall

8.7

Boarding

8.7

Entertainment

7.2

Comfort

8.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.7
Very good
61 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Crew

9.1

Food

7.8

Overall

8.7

Boarding

8.7

Entertainment

7.2

Comfort

8.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
EVA Air
8.4
Very good
1,171 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Crew

9.1

Food

7.8

Overall

8.7

Boarding

8.7

Entertainment

7.2

Comfort

8.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Japan Airlines
8.3
Very good
1,440 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Crew

9.1

Food

7.8

Overall

8.7

Boarding

8.7

Entertainment

7.2

Comfort

8.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very good
826 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Crew

9.1

Food

7.8

Overall

8.7

Boarding

8.7

Entertainment

7.2

Comfort

8.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
China Airlines
8.2
Very good
722 reviews
Air Tahiti Nui
8.7
Very good
61 reviews

Crew

9.1

Food

7.8

Overall

8.7

Boarding

8.7

Entertainment

7.2

Comfort

8.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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?

    $609 is the cheapest one-way deal found within the past few days, from Philippine Airlines. You may also be able to find cheap deals on Air Canada and Qantas Airways, with prices starting from $635 and $667, 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 - Brisbane and Seattle/Tacoma Intl - Melbourne.

  • 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, March is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,044). Flying from Seattle to Australia in December is currently the most expensive (average of $1,643). 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$759Average$1,413FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$807Average$1,198FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$834Average$1,202FlexibilityNo cancel feeOn-time67%
Alaska AirlinesCheapest$854Average$1,262FlexibilityNo cancel feeOn-time75%
DeltaCheapest$855Average$1,145FlexibilityNo cancel feeOn-timeN/A
ANACheapest$861Average$1,196FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$866Average$1,507FlexibilityNo cancel feeOn-time74%
Hawaiian AirlinesCheapest$879Average$1,145FlexibilityNo cancel feeOn-time85%
Singapore AirlinesCheapest$1,199Average$1,630FlexibilityNo cancel feeOn-time81%
Air New ZealandCheapest$1,227Average$1,603FlexibilityNo cancel feeOn-time78%
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