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Cheap flights from Seattle to Australia from $553

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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
21 Apr — 28 Apr1
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 22 March 2026.

Mon 13/419:59
SEA
-
SYD
1 stop41h 51m
Delta
Mon 27/409:15
SYD
-
SEA
1 stop28h 10m
Delta
Deal found 20/3$1,243
Wed 6/510:15
SEA
-
SYD
1 stop27h 35m
Delta
Mon 1/609:15
SYD
-
SEA
1 stop24h 36m
Delta
Deal found 22/3$1,255
Sun 19/411:40
SEA
-
SYD
1 stop26h 10m
Delta
Mon 11/509:15
SYD
-
SEA
1 stop24h 38m
Delta
Deal found 20/3$1,256
Mon 4/517:06
SEA
-
SYD
2 stops25h 59m
Multiple Airlines
Mon 11/513:15
SYD
-
SEA
2 stops22h 25m
Multiple Airlines
Deal found 19/3$1,260
Sat 9/521:20
SEA
-
SYD
1 stop40h 30m
Delta
Tue 2/609:15
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 22/3$1,266
Sat 9/521:20
SEA
-
SYD
1 stop40h 30m
Delta
Wed 3/609:15
SYD
-
SEA
2 stops23h 06m
Delta
Deal found 22/3$1,272
Thu 7/517:35
SEA
-
SYD
1 stop20h 15m
Delta
Tue 2/609:15
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 22/3$1,302
Sat 18/413:45
SEA
-
SYD
1 stop24h 05m
Delta
Mon 11/509:15
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 20/3$1,303
Tue 28/410:20
SEA
-
BNE
1 stop27h 45m
Air Canada
Sun 10/510:00
BNE
-
SEA
1 stop21h 20m
Air Canada
Deal found 18/3$1,309
Tue 5/514:55
SEA
-
BNE
1 stop23h 10m
Air Canada
Tue 12/510:00
BNE
-
SEA
1 stop17h 05m
Air Canada
Deal found 20/3$1,311
Sun 26/415:40
SEA
-
BNE
1 stop22h 25m
Multiple Airlines
Sun 3/520:40
BNE
-
SEA
2 stops30h 10m
Multiple Airlines
Deal found 17/3$1,349
Wed 29/415:40
SEA
-
BNE
1 stop22h 25m
Multiple Airlines
Sun 10/520:40
BNE
-
SEA
2 stops30h 25m
Multiple Airlines
Deal found 22/3$1,350

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 22 March 2026.

Round-trip from

$1,243

One-way from

$553

Popular in

December

Cheapest in

August

Average price

$1,444
Delta
  • Delta
  • 13/4-27/4
  • 2 total stops
  • 70h 01m total
  • Seattle to Australia
Search Deals
21/4
  • 21/4
  • 2 total stops
  • 42h 13m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($381 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($93 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 22 March 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

Wed 6/5

13:45-06:50

1 stop24h 05m

Sydney Kingsford Smith

Wed 3/6

09:15-12:21

1 stop20h 06m

$1,255

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/4

11:10-06:50

2 stops26h 40m

Sydney Kingsford Smith

Thu 14/5

09:15-16:44

2 stops24h 29m

$1,309

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 9/5

10:50-06:50

2 stops27h 00m

Sydney Kingsford Smith

Sat 23/5

09:15-15:23

2 stops23h 08m

$1,354

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 1/8

05:25-06:50

2 stops32h 25m

Sydney Kingsford Smith

Fri 14/8

09:15-18:29

2 stops26h 14m

$1,354

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 18/4

15:40-07:05

1 stop22h 25m

Brisbane

Tue 5/5

10:00-18:30

1 stop25h 30m

$1,361

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Sun 6/9

19:20-20:05

2 stops31h 45m

Melbourne Avalon

Sat 19/9

20:55-09:52

2 stops29h 57m

$1,497

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Sun 10/5

19:20-20:05

2 stops31h 45m

Melbourne Avalon

Sat 23/5

16:40-09:50

2 stops34h 10m

$1,497

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Mon 4/5

19:20-20:05

2 stops31h 45m

Melbourne Avalon

Mon 18/5

16:40-10:05

2 stops34h 25m

$1,521

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 14/8

16:49-07:05

1 stop21h 16m

Sydney Kingsford Smith

Fri 28/8

09:10-21:32

1 stop29h 22m

$1,571

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Sat 2/5

21:06-11:40

2 stops45h 34m

Coolangatta Gold Coast

Sat 9/5

20:50-23:29

2 stops43h 39m

$1,608

Flights are sorted by cheapest return flights first.

Deals found on 18/3

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 $607). Flying from Seattle to Australia in December is currently the most expensive (average of $1,203). 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.

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 22 March 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
9,455 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,455 reviews
United Airlines
7.4
Good
9,455 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Air Canada
7.1
Good
10,830 reviews
United Airlines
7.4
Good
9,455 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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, Air Canada, and Qantas Airways can get you from Seattle to Australia in just under 22h 25m. Your travel time can differ by up to 2h 31m. 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 ANA, which is currently one of the cheapest options available, starting at $523. Qantas Airways flights start at $526 while deals on United Airlines start at $571 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 $607). Flying from Seattle to Australia in December is currently the most expensive (average of $1,203). 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 22 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$615Average$1,797FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,137Average$2,052FlexibilityNo 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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