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Cheap flights from Seattle to Sydney from $755

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 19/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
10 Sep — 17 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Sydney
Explore the most affordable flight options available from Seattle to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 August 2026.

Wed 11/1115:15 -
1 stop23h 20m
Mon 30/1111:20 -
1 stop26h 02m
Deal found 5/8$1,328
Wed 9/915:00 -
1 stop23h 20m
Wed 16/909:20 -
1 stop22h 02m
Deal found 6/8$1,331
Mon 14/910:50 -
1 stop27h 30m
Tue 22/909:20 -
1 stop22h 02m
Deal found 10/8$1,335
Sun 25/1015:31 -
1 stop23h 04m
Mon 16/1111:20 -
1 stop29h 37m
Deal found 9/8$1,344
Sun 30/815:00 -
1 stop23h 20m
Sun 13/909:20 -
1 stop26h 12m
Deal found 10/8$1,355
Sun 27/919:15 -
1 stop19h 05m
Wed 14/1006:00 -
2 stops21h 52m
Deal found 9/8$1,358
Sun 30/819:20 -
2 stops24h 20m
Sun 13/909:20 -
1 stop26h 12m
Deal found 8/8$1,359
Fri 13/1115:15 -
1 stop23h 20m
Sun 29/1108:30 -
2 stops19h 57m
Deal found 10/8$1,364
Tue 10/1115:15 -
1 stop23h 20m
Sun 22/1108:30 -
2 stops19h 57m
Deal found 9/8$1,366

Find flight deals from Seattle to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 11 August 2026.

Round-trip from

$1,328

One-way from

$755

Popular in

December

Cheapest in

August

Average price

$1,127
Air Canada
  • Air Canada
  • 8/9-14/9
  • 2 total stops
  • 45h 22m total
  • Seattle to Sydney
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American Airlines
  • American Airlines
  • 19/8
  • 1 total stop
  • 26h 50m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($462 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($110 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Sydney 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 11 August 2026.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 28/10

11:05-07:30

2 stops26h 25m

Sydney Kingsford Smith

Thu 19/11

10:40-16:52

2 stops25h 12m

$1,621

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 1/10

11:22-06:50

2 stops26h 28m

Sydney Kingsford Smith

Sun 4/10

10:15-16:50

2 stops24h 35m

$2,135

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 26/8

11:03-06:55

2 stops26h 52m

Sydney Kingsford Smith

Wed 2/9

10:20-17:42

2 stops24h 22m

$2,174
Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 5/1

10:45-06:20

1 stop24h 35m

Sydney Kingsford Smith

Thu 21/1

11:50-10:21

1 stop17h 31m

$2,220

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 15/11

13:35-11:45

2 stops27h 10m

Sydney Kingsford Smith

Wed 18/11

09:55-14:42

2 stops23h 47m

$2,870

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 24/12

13:41-11:45

2 stops27h 04m

Sydney Kingsford Smith

Fri 8/1

21:50-14:42

2 stops35h 52m

$3,183

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 27/11

16:05-11:05

2 stops24h 00m

Sydney Kingsford Smith

Sun 27/12

11:05-15:49

2 stops23h 44m

$3,689

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/11

14:35-07:35

2 stops46h 00m

Sydney Kingsford Smith

Wed 18/11

11:40-11:47

3 stops43h 07m

$3,774

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 6/9

17:40-08:15

3 stops45h 35m

Sydney Kingsford Smith

Mon 19/10

11:15-15:40

3 stops46h 25m

$3,795
Cheapest one-way

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 9/9

09:40-06:50

2 stops28h 10m

$800

Flights are sorted by cheapest return flights first.

Deals found on 6/8

Showing 1-10 of 17 resultsSorted by cheapest first
1
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Best time to book a flight from Seattle to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney

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

The price you pay for your flight from Seattle to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 49 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Sydney?

Currently, August is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,127). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,409). 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 much does it cost for a return flight from Seattle to Sydney?

Airfare is typical for this route at the moment.

Seattle to Sydney flights typically cost between $871 and $1,586 in September.
The cheapest return price found within the last 5 days was $1,328 on Air Canada (8 Sept–14 Sept).

Related info for your journey

Find useful and relevant information for your journey from Seattle to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Sydney?

    Delta and United Airlines can get you from Seattle to Sydney in just under 26h 25m. Your travel time can differ by up to 27m. Airlines will cover a distance of 12463 km. Both multi-stop and direct flights can be found to your destination and back.

  • Can I find deals for flights from Seattle to Sydney that include hotel bookings?

    Yes. In addition to deals on Seattle to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Sydney.

  • Can I find deals for business class flights from Seattle to Sydney?

    Yes. Cheapflights offers flight deals from Seattle to Sydney 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 Sydney?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,127). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,409). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Manly
Katoomba
Lithgow
Cronulla
Randwick
Terrigal
Leura
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Sydney flights
Spokane to Sydney flights
Seattle to Coolangatta flights
Portland to Coolangatta 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 Sydney?

Deals for Seattle to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Need flexible booking options for your flight to Sydney from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Seattle to Sydney flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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