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$519+ Cheap flights from Seattle (SEA) to Sydney (SYD)

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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Cheap flight deals from Seattle to Sydney

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 July 27, 2026.

This lastminute.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/264:30 pm
SEA
-
SYD
1 stop33h 40m
ANA
Tue 8/1111:45 am
SYD
-
SEA
2 stops23h 47m
ANA
Deal found 7/23$927
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Wed 11/182:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$957
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Mon 11/162:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$962
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Tue 11/172:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$968
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Mon 11/162:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$971
This FlightHub deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:30 pm
SEA
-
SYD
1 stop33h 40m
ANA
Tue 8/1811:45 am
SYD
-
SEA
2 stops23h 47m
ANA
Deal found 7/22$973
This Gotogate deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/34:30 pm
SEA
-
SYD
1 stop23h 55m
ANA
Tue 8/188:55 pm
SYD
-
SEA
1 stop34h 30m
ANA
Deal found 7/23$974
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Tue 11/172:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$977
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Wed 11/182:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$979

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 July 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$957
(Kiwi.com)

One-way from

$519
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,298
Provider with most accurate pricing for Seattle/Tacoma Intl-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sydney Kingsford Smith flights.
Search Deals
From Seattle/Tacoma Intl to Sydney Kingsford Smith
Search Deals
One-way flight from Seattle/Tacoma Intl to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($239 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated July 27, 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 round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 12/1

7:32 pm-9:20 am

1 stop18h 48m

Sydney Kingsford Smith

Sun 12/13

9:15 am-10:38 pm

1 stop32h 23m

$1,089

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 10/31

3:49 pm-7:00 am

2 stops45h 11m

Sydney Kingsford Smith

Tue 11/10

9:20 am-5:54 pm

2 stops27h 34m

$1,093

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 9/1

11:03 am-7:00 am

2 stops26h 57m

Sydney Kingsford Smith

Tue 9/8

9:30 am-5:52 pm

2 stops25h 22m

$1,093
Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 10/1

12:16 pm-7:00 am

1 stop25h 44m

Sydney Kingsford Smith

Thu 10/15

10:30 am-5:37 pm

2 stops25h 07m

$1,200

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 11/14

6:51 pm-9:05 am

2 stops43h 14m

Sydney Kingsford Smith

Sat 11/28

11:20 am-9:23 pm

2 stops29h 03m

$1,325

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 12/22

5:45 am-6:50 am

2 stops30h 05m

Sydney Kingsford Smith

Tue 1/12

2:15 pm-6:30 pm

2 stops23h 15m

$1,732

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 9/13

7:15 am-6:30 am

2 stops30h 15m

Sydney Kingsford Smith

Wed 10/14

3:50 pm-9:15 pm

3 stops47h 25m

$2,107

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 12/26

3:50 pm-10:25 pm

2 stops35h 35m

Sydney Kingsford Smith

Sun 1/3

9:10 pm-11:40 am

1 stop33h 30m

$2,226

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 10/28

2:30 pm-5:55 pm

2 stops33h 25m

Sydney Kingsford Smith

Thu 11/19

4:10 pm-7:23 pm

3 stops46h 13m

$2,254

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 10/31

8:45 pm-5:40 pm

3 stops50h 55m

Sydney Kingsford Smith

Tue 11/10

8:55 am-5:57 pm

2 stops28h 02m

$2,448

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

Compare providers for flights from Seattle to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Sydney in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
BudgetAirPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JetabroadPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Sydney flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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?

To ensure you get the cheapest price possible for a flight from Seattle to Sydney, you should look to book at least 49 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 $735). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,659). 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 to fly round-trip from Seattle to Sydney?

Airfare is typical for this route at the moment.

Seattle to Sydney flights typically cost between $615 and $1,126 in November.
The cheapest round-trip price found within the last 5 days was $957 on Multiple Airlines (Nov 5-Nov 18).

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated July 27, 2026.
Read reviews from past customers who have flown ANA,Alaska Airlines, andDelta from Seattle to Sydney. 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.
ANA
8.3
Very good
1,283 reviews

Food

7.8

Boarding

8.5

Crew

8.7

Comfort

8.2

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

IAH - HND

Outstanding service on board. Loved that we got to use Polaris Lounge at IAH. On time and terrific trip.
ANA
8.3
Very good
1,283 reviews
ANA
8.3
Very good
1,283 reviews

Food

7.8

Boarding

8.5

Crew

8.7

Comfort

8.2

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

IAH - HND

Outstanding service on board. Loved that we got to use Polaris Lounge at IAH. On time and terrific trip.
Alaska Airlines
7.9
Good
12,718 reviews
ANA
8.3
Very good
1,283 reviews

Food

7.8

Boarding

8.5

Crew

8.7

Comfort

8.2

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

IAH - HND

Outstanding service on board. Loved that we got to use Polaris Lounge at IAH. On time and terrific trip.
Delta
7.8
Good
8,486 reviews
ANA
8.3
Very good
1,283 reviews

Food

7.8

Boarding

8.5

Crew

8.7

Comfort

8.2

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

IAH - HND

Outstanding service on board. Loved that we got to use Polaris Lounge at IAH. On time and terrific trip.
United Airlines
7.4
Good
10,045 reviews
ANA
8.3
Very good
1,283 reviews

Food

7.8

Boarding

8.5

Crew

8.7

Comfort

8.2

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

IAH - HND

Outstanding service on board. Loved that we got to use Polaris Lounge at IAH. On time and terrific trip.
Air Canada
7.1
Good
11,393 reviews
ANA
8.3
Very good
1,283 reviews

Food

7.8

Boarding

8.5

Crew

8.7

Comfort

8.2

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

IAH - HND

Outstanding service on board. Loved that we got to use Polaris Lounge at IAH. On time and terrific trip.

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?

    Departing from Seattle to Sydney will take you 18h 48m. The distance between Seattle and Sydney is about 7744 mi.

  • What are the cheapest airlines flying from Seattle to Sydney round-trip?

    Cheapflights users have booked flights from Seattle to Sydney round-trip from $583. Other airlines that can offer you cheap pricing are Air Canada, from $778, and Qantas Airways, from $803. These flights start at 46% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at $366. Qantas Airways flights start at $380 while deals on Philippine Airlines start at $394 one-way.

  • Where are the most common layover locations when flying from Seattle to Sydney?

    The most popular layover on flights from Seattle to Sydney is Los Angeles. Vancouver sees the second most layovers for non-direct flights flying from Seattle to Sydney.

  • What are some popular things to do or see while on a layover in Los Angeles?

    Hollywood Bowl, Hollywood Walk of Fame, and Little Tokyo are currently the most popular points of interest in Los Angeles at the moment. Hollywood Bowl, Hollywood Walk of Fame and Little Tokyo are located about 12.4 mi, 11.7 mi, and 12.2 mi, respectively from Los Angeles if you are interested in checking them out. Travelers in need of a car in Los Angeles can rent one for about $43 per day.

  • What are some popular points of interest to see during a layover in Vancouver?

    Queen Elizabeth Theatre, Pacific Central Station, and Orpheum Theatre are currently the most popular points of interest in Vancouver at the moment. Those on a layover in Vancouver interested in visiting Queen Elizabeth Theatre, Pacific Central Station, or Orpheum Theatre can do so by traveling 6.6 mi, 6.6 mi, and 6.5 mi, respectively from Vancouver Intl. Those looking to explore during their layover in Vancouver can rent a car from Vancouver Intl for about $59 per day.

  • Where are the least popular layover locations for Seattle to Sydney flights?

    Seattle to Sydney flights have a layover in Honolulu the least frequently. Honolulu is followed by San Francisco in terms of the least popular layover location on flights from Seattle to Sydney.

  • 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 vacation 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 $735). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,659). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Coogee
Manly

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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

Top 9 airlines flying from Seattle to Sydney

Discover the top 9 airlines that operate flights from Seattle to Sydney. 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 2,558,603 searches. Data last updated July 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$583Average$632FlexibilityNo cancel feeOn-time80%
Air CanadaCheapest$778Average$1,075FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$803Average$1,083FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,126FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$899FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$827Average$1,358FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$833Average$1,195FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,223FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$947Average$1,276FlexibilityNo cancel feeOn-time78%

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