HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Australia

$399+ 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 7/30. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Jul 29 — Aug 51
Wed 7/29
Wed 8/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Australia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 29, 2026.

This Delta deal was found by Cheapflights users on 6/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/288:25 pm
SEA
-
SYD
1 stop41h 25m
Delta
Sun 7/129:15 am
SYD
-
SEA
1 stop22h 40m
Delta
Deal found 6/25$976
This Delta deal was found by Cheapflights users on 6/28. 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 6/2911:05 am
SEA
-
SYD
2 stops26h 45m
Delta
Sun 7/129:15 am
SYD
-
SEA
2 stops26h 18m
Delta
Deal found 6/28$982
This Delta deal was found by Cheapflights users on 6/29. 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.
Fri 7/312:35 pm
SEA
-
MEL
1 stop26h 15m
Delta
Fri 7/1710:00 am
MEL
-
SEA
1 stop23h 40m
Delta
Deal found 6/29$988
This Delta deal was found by Cheapflights users on 6/28. 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.
Wed 7/15:30 pm
SEA
-
SYD
1 stop20h 20m
Delta
Tue 8/259:15 am
SYD
-
SEA
1 stop22h 35m
Delta
Deal found 6/28$988
This Delta deal was found by Cheapflights users on 6/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/175:50 pm
SEA
-
MEL
1 stop21h 00m
Delta
Wed 8/2610:00 am
MEL
-
SEA
1 stop27h 30m
Delta
Deal found 6/25$989
This Delta deal was found by Cheapflights users on 6/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/25:50 pm
SEA
-
SYD
1 stop20h 00m
Delta
Sun 8/99:15 am
SYD
-
SEA
1 stop22h 35m
Delta
Deal found 6/25$989
This Delta deal was found by Cheapflights users on 6/26. 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 7/2812:35 pm
SEA
-
SYD
1 stop25h 15m
Delta
Tue 8/119:15 am
SYD
-
SEA
2 stops26h 29m
Delta
Deal found 6/26$992
This Delta deal was found by Cheapflights users on 6/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2910:05 am
SEA
-
MEL
1 stop28h 45m
Delta
Wed 7/1510:00 am
MEL
-
SEA
2 stops21h 35m
Delta
Deal found 6/25$993
This Delta deal was found by Cheapflights users on 6/28. 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.
Tue 6/308:25 pm
SEA
-
MEL
1 stop42h 25m
Delta
Fri 7/3110:00 am
MEL
-
SEA
1 stop27h 27m
Delta
Deal found 6/28$995
This Delta deal was found by Cheapflights users on 6/28. 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 7/279:46 pm
SEA
-
SYD
1 stop40h 04m
Delta
Sun 8/309:15 am
SYD
-
SEA
1 stop24h 22m
Delta
Deal found 6/28$995
This Delta deal was found by Cheapflights users on 6/28. 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.
Tue 6/308:25 pm
SEA
-
MEL
1 stop42h 25m
Delta
Sun 7/2610:00 am
MEL
-
SEA
2 stops21h 35m
Delta
Deal found 6/28$999
This Delta deal was found by Cheapflights users on 6/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/287:50 pm
SEA
-
MEL
2 stops43h 00m
Delta
Fri 7/1010:00 am
MEL
-
SEA
2 stops30h 59m
Delta
Deal found 6/24$1,005

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 June 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$988
(Delta)

One-way from

$399
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,099
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. 18% potential increase in price ($237 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 29, 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

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 8/17

2:50 pm-7:50 am

1 stop24h 00m

Melbourne

Wed 8/26

10:00 am-4:54 pm

2 stops23h 54m

$994

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 8/17

7:35 pm-8:15 am

1 stop19h 40m

Melbourne

Mon 8/31

10:10 am-2:24 pm

2 stops45h 14m

$1,111

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 11/26

11:25 am-8:30 am

2 stops26h 05m

Sydney Kingsford Smith

Tue 12/8

10:40 am-10:35 am

1 stop18h 55m

$1,142

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 10/28

7:20 am-7:30 am

2 stops30h 10m

Sydney Kingsford Smith

Thu 11/19

10:40 am-6:30 pm

2 stops26h 50m

$1,142

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 11/25

8:33 am-9:30 am

2 stops29h 57m

Melbourne

Tue 12/8

11:30 am-11:33 am

1 stop19h 03m

$1,153

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 8/11

9:09 pm-11:25 pm

2 stops33h 16m

Brisbane

Tue 8/18

7:40 am-11:59 pm

2 stops33h 19m

$1,167

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 10/25

6:51 pm-6:30 am

2 stops42h 39m

Brisbane

Thu 11/26

5:05 am-12:20 pm

2 stops25h 15m

$1,182

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 9/7

7:35 pm-11:20 am

2 stops22h 45m

Melbourne

Mon 9/14

6:30 am-3:45 pm

2 stops26h 15m

$1,192

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Sun 7/26

6:03 am-1:10 pm

2 stops38h 07m

Canberra

Sun 8/2

6:30 pm-11:59 pm

2 stops22h 29m

$1,257

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Mon 8/10

5:02 pm-10:45 am

2 stops24h 43m

Hobart

Mon 8/17

6:00 am-12:48 pm

2 stops23h 48m

$1,262

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/25

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 September 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.

How far ahead should I book a flight from Seattle to Australia?

Booking 72 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Australia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 June 29, 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
12,590 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

7.9

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Alaska Airlines
7.9
Good
12,590 reviews
Alaska Airlines
7.9
Good
12,590 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

7.9

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Delta
7.8
Good
8,449 reviews
Alaska Airlines
7.9
Good
12,590 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

7.9

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Qantas Airways
7.5
Good
1,054 reviews
Alaska Airlines
7.9
Good
12,590 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

7.9

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
United Airlines
7.4
Good
9,894 reviews
Alaska Airlines
7.9
Good
12,590 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

7.9

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Air Canada
7.1
Good
11,270 reviews
Alaska Airlines
7.9
Good
12,590 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

7.9

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

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, United Airlines, and Qantas Airways can get you from Seattle to Australia in just under 21h. Your travel time can differ by up to 21h 39m. The distance from Seattle to Australia is about 8180 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 - 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 September 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 June 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,404FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$385Average$1,093FlexibilityNo cancel feeOn-time67%
ANACheapest$583Average$638FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$789Average$1,254FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,126FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$928FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$831Average$1,385FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,401FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$947Average$1,538FlexibilityNo cancel feeOn-time78%
Cathay PacificCheapest$1,153Average$1,271FlexibilityNo cancel feeOn-time72%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.