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Cheap flights from Seattle to Australia from $713

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 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
7 Aug — 14 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Australia

Enter your travel dates to find the best prices.

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 8 July 2026.

Mon 3/815:21
SEA
-
SYD
1 stop22h 34m
American Airlines
Sun 16/817:50
SYD
-
SEA
1 stop22h 31m
American Airlines
Deal found 7/7$1,406
Mon 27/715:21
SEA
-
SYD
1 stop22h 34m
American Airlines
Tue 11/809:10
SYD
-
SEA
1 stop24h 22m
American Airlines
Deal found 3/7$1,409
Mon 3/817:50
SEA
-
MEL
1 stop21h 00m
Delta
Sun 16/810:00
MEL
-
SEA
1 stop30h 44m
Delta
Deal found 7/7$1,410
Mon 27/715:21
SEA
-
SYD
1 stop22h 34m
American Airlines
Mon 3/817:50
SYD
-
SEA
1 stop20h 55m
American Airlines
Deal found 6/7$1,410
Mon 3/818:57
SEA
-
SYD
1 stop18h 58m
United Airlines
Sun 16/810:20
SYD
-
SEA
1 stop19h 00m
United Airlines
Deal found 7/7$1,412
Mon 17/811:40
SEA
-
SYD
1 stop26h 25m
American Airlines
Mon 24/809:10
SYD
-
SEA
2 stops24h 31m
American Airlines
Deal found 5/7$1,413
Mon 27/717:20
SEA
-
SYD
1 stop20h 35m
United Airlines
Tue 11/809:30
SYD
-
SEA
2 stops29h 01m
United Airlines
Deal found 3/7$1,415
Mon 3/814:20
SEA
-
SYD
1 stop24h 10m
American Airlines
Mon 17/809:10
SYD
-
SEA
1 stop24h 22m
American Airlines
Deal found 8/7$1,419
Wed 29/712:35
SEA
-
MEL
1 stop26h 15m
Delta
Wed 12/810:00
MEL
-
SEA
1 stop21h 50m
Delta
Deal found 6/7$1,423
Mon 27/719:05
SEA
-
SYD
1 stop18h 50m
United Airlines
Tue 15/909:30
SYD
-
SEA
1 stop23h 09m
United Airlines
Deal found 7/7$1,423
Mon 27/714:20
SEA
-
SYD
1 stop24h 10m
American Airlines
Tue 4/809:10
SYD
-
SEA
2 stops22h 46m
American Airlines
Deal found 4/7$1,425
Wed 26/816:30
SEA
-
SYD
1 stop23h 55m
ANA
Wed 2/911:45
SYD
-
SEA
2 stops25h 58m
ANA
Deal found 6/7$1,426

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 8 July 2026.

Round-trip from

$1,406

One-way from

$713

Popular in

December

Cheapest in

August

Average price

$1,822
American Airlines
  • American Airlines
  • 3/8-16/8
  • 2 total stops
  • 45h 05m total
  • Seattle to Australia
Search Deals
ANA
  • ANA
  • 24/8
  • 2 total stops
  • 29h 45m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($500 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($115 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 8 July 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 return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/8

17:04-07:00

1 stop20h 56m

Sydney Kingsford Smith

Tue 11/8

10:20-11:25

1 stop18h 05m

$1,413

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 19/8

17:50-07:50

1 stop21h 00m

Melbourne

Wed 26/8

10:00-16:37

1 stop23h 37m

$1,423

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 27/7

10:29-06:55

1 stop27h 26m

Sydney Kingsford Smith

Mon 10/8

09:30-21:10

2 stops28h 40m

$1,423

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 17/8

10:55-06:55

1 stop27h 00m

Sydney Kingsford Smith

Mon 24/8

09:30-21:15

2 stops28h 45m

$1,423

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 5/8

09:40-07:50

2 stops29h 10m

Melbourne

Wed 12/8

10:00-16:37

1 stop23h 37m

$1,430

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 12/11

14:30-09:50

1 stop24h 20m

Melbourne

Thu 26/11

12:00-16:59

1 stop23h 59m

$1,553

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 25/11

17:55-08:30

1 stop19h 35m

Sydney Kingsford Smith

Tue 8/12

10:40-14:47

1 stop23h 07m

$1,567

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 14/8

18:52-07:00

1 stop19h 08m

Sydney Kingsford Smith

Thu 3/9

09:30-21:15

2 stops28h 45m

$1,567

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 24/11

12:00-08:30

1 stop25h 30m

Sydney Kingsford Smith

Sun 13/12

10:40-13:00

1 stop21h 20m

$1,567

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 28/8

18:52-07:30

1 stop19h 38m

Melbourne

Mon 14/9

06:30-21:15

3 stops31h 45m

$1,598

Flights are sorted by cheapest return flights first.

Deals found on 5/7

Showing 1-10 of 60 resultsSorted by cheapest first
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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 return 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 $140). Flying from Seattle to Australia in September is currently the most expensive (average of $1,121). 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 8 July 2026.
Read reviews from past customers who have flown with United Airlines and Air Canada from Seattle to Australia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,949 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.7

Overall

7.4

Boarding

7.7

Reviews

1 / 20
6.0
Good

ROHIT,June 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
9,949 reviews
United Airlines
7.4
Good
9,949 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.7

Overall

7.4

Boarding

7.7

Reviews

1 / 20
6.0
Good

ROHIT,June 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
Air Canada
7.1
Good
11,321 reviews
United Airlines
7.4
Good
9,949 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.7

Overall

7.4

Boarding

7.7

Reviews

1 / 20
6.0
Good

ROHIT,June 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

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?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Australia. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

  • 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 20h 56m. Your travel time can differ by up to 1h 57m. There are 12463 km between Seattle and Australia. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    To fly one-way, consider booking your trip with Qantas Airways, which is currently one of the cheapest options available, starting at $535. United Airlines flights start at $578 while deals on Air Canada start at $619 one-way.

  • What are the most popular routes from Seattle to Australia?

    Most travellers choose Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Melbourne or Seattle/Tacoma Intl - Brisbane when deciding on the best route from Seattle to Australia.

  • 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 holiday 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 $140). Flying from Seattle to Australia in September is currently the most expensive (average of $1,121). 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 2 airlines flying from Seattle to Australia

Discover the top 2 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 647,157 searches. Data last updated 8 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$622Average$1,775FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,151Average$1,884FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Australia?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Australia. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Australia?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Australia.

Can Cheapflights find flights from Seattle to Australia with no change fees?

Certainly. Search results for flights to Australia from Seattle shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Seattle to Australia become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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