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Cheap flights from Seattle to Australia from $578

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 30/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
28 Jul — 4 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 28 June 2026.

Sun 28/620:25
SEA
-
SYD
1 stop41h 25m
Delta
Sun 12/709:15
SYD
-
SEA
1 stop22h 40m
Delta
Deal found 25/6$1,415
Mon 29/614:55
SEA
-
MEL
1 stop23h 55m
Delta
Wed 15/710:00
MEL
-
SEA
1 stop21h 55m
Delta
Deal found 25/6$1,432
Wed 1/717:30
SEA
-
SYD
1 stop20h 20m
Delta
Tue 25/809:15
SYD
-
SEA
1 stop22h 35m
Delta
Deal found 28/6$1,432
Mon 17/817:50
SEA
-
MEL
1 stop21h 00m
Delta
Wed 26/810:00
MEL
-
SEA
1 stop27h 30m
Delta
Deal found 25/6$1,434
Sun 2/817:50
SEA
-
SYD
1 stop20h 00m
Delta
Sun 9/809:15
SYD
-
SEA
1 stop22h 35m
Delta
Deal found 25/6$1,434
Sun 28/617:30
SEA
-
SYD
1 stop20h 20m
Delta
Sun 5/709:15
SYD
-
SEA
1 stop24h 32m
Delta
Deal found 24/6$1,435
Tue 28/712:35
SEA
-
SYD
1 stop25h 15m
Delta
Tue 11/809:15
SYD
-
SEA
2 stops26h 29m
Delta
Deal found 26/6$1,438
Mon 29/609:30
SEA
-
SYD
2 stops28h 20m
Delta
Sun 12/709:15
SYD
-
SEA
2 stops22h 20m
Delta
Deal found 25/6$1,439
Sun 28/621:40
SEA
-
MEL
1 stop41h 10m
Delta
Fri 10/710:00
MEL
-
SEA
1 stop19h 30m
Delta
Deal found 24/6$1,442
Mon 27/721:46
SEA
-
SYD
1 stop40h 04m
Delta
Sun 30/809:15
SYD
-
SEA
1 stop24h 22m
Delta
Deal found 28/6$1,442
Sun 28/620:25
SEA
-
MEL
1 stop42h 25m
Delta
Wed 8/710:00
MEL
-
SEA
1 stop29h 05m
Delta
Deal found 24/6$1,444
Thu 6/821:45
SEA
-
MEL
1 stop41h 05m
Delta
Wed 19/810:00
MEL
-
SEA
2 stops29h 05m
Delta
Deal found 23/6$1,450

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 28 June 2026.

Round-trip from

$1,432

One-way from

$578

Popular in

December

Cheapest in

August

Average price

$1,573
Delta
  • Delta
  • 28/7-11/8
  • 2 total stops
  • 45h 27m total
  • Seattle to Australia
Search Deals
30/7
  • 30/7
  • 2 total stops
  • 43h 16m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($445 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($111 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 28 June 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

Mon 3/8

09:40-06:50

2 stops28h 10m

Sydney Kingsford Smith

Mon 10/8

09:15-20:30

1 stop28h 15m

$1,441

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 6/8

21:45-07:50

1 stop41h 05m

Melbourne

Wed 19/8

10:00-22:05

2 stops29h 05m

$1,450

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 5/10

07:15-08:50

2 stops31h 35m

Melbourne

Tue 13/10

11:00-22:05

2 stops29h 05m

$1,525

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 18/8

12:44-08:15

2 stops26h 31m

Melbourne

Wed 2/9

09:30-21:15

2 stops28h 45m

$1,561

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 9/8

18:48-08:15

1 stop20h 27m

Melbourne

Sun 16/8

10:55-20:43

1 stop26h 48m

$1,579

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 17/8

19:35-08:15

1 stop19h 40m

Melbourne

Mon 31/8

10:10-14:24

2 stops45h 14m

$1,610

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 21/11

19:59-09:50

1 stop42h 51m

Melbourne

Wed 9/12

12:00-16:53

2 stops23h 53m

$1,651

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 28/10

07:20-07:30

2 stops30h 10m

Sydney Kingsford Smith

Thu 19/11

10:40-18:30

2 stops26h 50m

$1,655
Fastest return journey

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 25/12

14:10-05:50

1 stop21h 40m

Brisbane

Thu 14/1

13:10-19:22

1 stop24h 12m

$1,673

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 5/11

15:27-07:30

1 stop22h 03m

Brisbane

Sun 15/11

11:40-17:53

2 stops24h 13m

$1,682

Flights are sorted by cheapest return flights first.

Deals found on 25/6

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 $141). Flying from Seattle to Australia in September is currently the most expensive (average of $1,128). 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 28 June 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
9,899 reviews
Check prices

Comfort

7.3

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

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
9,899 reviews
United Airlines
7.4
Good
9,899 reviews
Check prices

Comfort

7.3

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

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
11,269 reviews
United Airlines
7.4
Good
9,899 reviews
Check prices

Comfort

7.3

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

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 21h 40m. Your travel time can differ by up to 6h 30m. There are 11822 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 $581 while deals on Air Canada start at $623 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 - Melbourne Avalon 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 $141). Flying from Seattle to Australia in September is currently the most expensive (average of $1,128). 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 28 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$626Average$1,787FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,158Average$1,896FlexibilityNo 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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