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Cheap flights from Seattle to Australia from $571

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
27 Apr — 4 May1
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 March 2026.

Sun 19/420:00
SEA
-
SYD
1 stop18h 20m
Air Canada
Tue 5/509:20
SYD
-
SEA
1 stop17h 45m
Air Canada
Deal found 26/3$1,330
Tue 12/510:45
SEA
-
BNE
1 stop27h 20m
Air Canada
Tue 19/510:15
BNE
-
SEA
1 stop16h 50m
Air Canada
Deal found 28/3$1,333
Sun 19/410:20
SEA
-
SYD
1 stop28h 00m
Air Canada
Mon 11/509:20
SYD
-
SEA
1 stop26h 10m
Air Canada
Deal found 27/3$1,349
Wed 6/514:55
SEA
-
SYD
1 stop23h 25m
Air Canada
Wed 27/509:20
SYD
-
SEA
1 stop17h 45m
Air Canada
Deal found 24/3$1,350
Sun 10/505:50
SEA
-
SYD
1 stop32h 30m
Air Canada
Tue 2/609:20
SYD
-
SEA
1 stop30h 23m
Air Canada
Deal found 25/3$1,365
Mon 13/420:00
SEA
-
SYD
2 stops23h 40m
Multiple Airlines
Mon 27/409:20
SYD
-
SEA
1 stop27h 00m
Multiple Airlines
Deal found 23/3$1,371
Sat 1/817:48
SEA
-
SYD
1 stop20h 02m
Delta
Fri 14/809:15
SYD
-
SEA
1 stop28h 13m
Delta
Deal found 23/3$1,373
Tue 12/510:45
SEA
-
BNE
1 stop27h 20m
Multiple Airlines
Tue 19/519:25
BNE
-
SEA
2 stops31h 40m
Multiple Airlines
Deal found 28/3$1,373
Tue 28/410:20
SEA
-
BNE
1 stop27h 45m
Multiple Airlines
Sun 10/520:40
BNE
-
SEA
2 stops30h 25m
Multiple Airlines
Deal found 24/3$1,376
Wed 6/514:55
SEA
-
SYD
1 stop23h 25m
Multiple Airlines
Wed 27/506:00
SYD
-
SEA
2 stops21h 05m
Multiple Airlines
Deal found 26/3$1,378
Fri 15/514:55
SEA
-
BNE
1 stop23h 10m
Air Canada
Tue 26/510:15
BNE
-
SEA
1 stop21h 05m
Air Canada
Deal found 26/3$1,387
Sat 18/415:40
SEA
-
BNE
1 stop22h 25m
Air Canada
Tue 5/510:00
BNE
-
SEA
1 stop17h 05m
Air Canada
Deal found 24/3$1,388

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 March 2026.

Round-trip from

$1,279

One-way from

$571

Popular in

December

Cheapest in

August

Average price

$1,472
Delta
  • Delta
  • 19/4-11/5
  • 2 total stops
  • 44h 50m total
  • Seattle to Australia
Search Deals
5/5
  • 5/5
  • 2 total stops
  • 31h 44m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($396 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($96 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 28 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
Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 28/7

19:15-07:05

1 stop18h 50m

Sydney Kingsford Smith

Tue 11/8

21:25-23:59

1 stop19h 34m

$1,394

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 12/5

19:20-07:05

1 stop18h 45m

Brisbane

Wed 20/5

19:25-10:05

2 stops31h 40m

$1,429

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 28/7

10:50-06:50

2 stops27h 00m

Sydney Kingsford Smith

Tue 11/8

09:15-16:52

2 stops24h 37m

$1,430

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 26/5

17:35-06:50

1 stop20h 15m

Sydney Kingsford Smith

Thu 11/6

09:15-23:59

1 stop31h 44m

$1,482

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 1/8

17:48-06:50

1 stop20h 02m

Sydney Kingsford Smith

Fri 14/8

09:15-22:05

2 stops29h 50m

$1,526

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 25/4

15:40-16:40

2 stops32h 30m

Adelaide

Tue 28/4

20:00-09:38

2 stops30h 08m

$1,535

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 21/5

19:55-06:50

1 stop41h 55m

Sydney Kingsford Smith

Thu 11/6

09:15-22:19

1 stop30h 04m

$1,540

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 9/5

19:20-18:10

2 stops30h 20m

Adelaide

Sat 16/5

17:15-10:05

2 stops33h 20m

$1,546

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 6/7

19:20-13:30

2 stops25h 40m

Adelaide

Fri 24/7

19:35-09:52

2 stops30h 47m

$1,673

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Sun 6/9

15:00-20:05

2 stops36h 05m

Melbourne Avalon

Sun 13/9

14:55-09:52

2 stops35h 57m

$1,689

Flights are sorted by cheapest return flights first.

Deals found on 25/3

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 $618). Flying from Seattle to Australia in December is currently the most expensive (average of $1,227). 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 28 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
9,499 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

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
9,499 reviews
United Airlines
7.4
Good
9,499 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

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
10,853 reviews
United Airlines
7.4
Good
9,499 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

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 Qatar Airways can get you from Seattle to Australia in just under 18h 05m. Your travel time can differ by up to 17h 05m. 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 $533. Qantas Airways flights start at $536 while deals on United Airlines start at $582 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 $618). Flying from Seattle to Australia in December is currently the most expensive (average of $1,227). 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 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$627Average$1,832FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,160Average$2,092FlexibilityNo 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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