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$454+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
May 17 — May 241
Sun 5/17
Sun 5/24
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 April 17, 2026.

This Jetabroad deal was found by Cheapflights users on 4/16. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/111:55 pm
SEA
-
SYD
1 stop38h 50m
Philippine Airlines
Mon 11/3011:35 am
SYD
-
SEA
1 stop26h 00m
Philippine Airlines
Deal found 4/16$692
This FlightHub deal was found by Cheapflights users on 4/16. 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.
Fri 9/411:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Sun 9/1310:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 4/16$885
This Trip.com deal was found by Cheapflights users on 4/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2711:21 am
SEA
-
SYD
2 stops31h 29m
Multiple Airlines
Wed 6/31:20 pm
SYD
-
SEA
3 stops37h 46m
Multiple Airlines
Deal found 4/15$947
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:10 am
SEA
-
SYD
1 stop31h 55m
American Airlines
Sun 5/2412:00 pm
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 4/16$970
This American Airlines deal was found by Cheapflights users on 4/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/311:41 am
SEA
-
SYD
2 stops26h 24m
American Airlines
Sun 5/179:10 am
SYD
-
SEA
1 stop25h 57m
American Airlines
Deal found 4/12$973
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/22:20 pm
SEA
-
SYD
1 stop24h 10m
American Airlines
Wed 8/199:10 am
SYD
-
SEA
1 stop18h 45m
American Airlines
Deal found 4/14$978
This Delta deal was found by Cheapflights users on 4/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/113:00 pm
SEA
-
SYD
1 stop22h 50m
Delta
Wed 5/279:15 am
SYD
-
SEA
1 stop24h 38m
Delta
Deal found 4/12$981
This American Airlines deal was found by Cheapflights users on 4/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:57 pm
SEA
-
SYD
2 stops23h 08m
American Airlines
Sun 5/3112:00 pm
SYD
-
SEA
1 stop24h 17m
American Airlines
Deal found 4/13$982
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/182:57 pm
SEA
-
SYD
2 stops23h 08m
American Airlines
Wed 6/312:00 pm
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 4/16$983
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/211:43 am
SEA
-
SYD
1 stop26h 12m
American Airlines
Wed 6/179:10 am
SYD
-
SEA
1 stop29h 39m
American Airlines
Deal found 4/15$985
This Delta deal was found by Cheapflights users on 4/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/119:25 am
SEA
-
SYD
2 stops28h 25m
Delta
Tue 5/269:15 am
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 4/12$986

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 April 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$885
(FlightHub)

One-way from

$454
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,038
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. 16% potential increase in price ($210 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 17, 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

Sun 5/10

9:25 am-6:50 am

2 stops28h 25m

Sydney Kingsford Smith

Sat 6/13

9:15 am-10:19 pm

1 stop30h 04m

$1,026

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 8/1

9:26 am-6:50 am

2 stops28h 24m

Sydney Kingsford Smith

Fri 8/14

9:15 am-4:52 pm

2 stops24h 37m

$1,051

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

9:50 am-6:50 am

2 stops28h 00m

Sydney Kingsford Smith

Wed 5/13

9:15 am-1:00 pm

2 stops20h 45m

$1,104

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/24

2:40 pm-7:05 am

1 stop23h 25m

Sydney Kingsford Smith

Fri 6/5

9:10 am-9:49 pm

1 stop29h 39m

$1,128

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

10:00 am-6:50 pm

1 stop39h 50m

Sydney Kingsford Smith

Tue 5/12

8:45 pm-6:00 am

1 stop26h 15m

$1,173
Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/2

5:59 pm-6:50 am

1 stop19h 51m

Sydney Kingsford Smith

Fri 5/22

9:15 am-10:55 am

1 stop18h 40m

$1,199

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/10

5:45 am-6:50 am

2 stops32h 05m

Sydney Kingsford Smith

Thu 8/20

9:15 am-2:45 pm

2 stops22h 30m

$1,216

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/28

8:42 am-7:00 am

3 stops29h 18m

Sydney Kingsford Smith

Sun 5/17

10:20 am-10:43 am

1 stop17h 23m

$1,226

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/28

8:42 am-7:00 am

3 stops29h 18m

Sydney Kingsford Smith

Sat 5/23

10:20 am-4:24 pm

1 stop23h 04m

$1,275

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 9/5

5:45 am-6:50 am

2 stops32h 05m

Sydney Kingsford Smith

Sat 9/26

9:15 am-2:45 pm

2 stops22h 30m

$1,328

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 20 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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Sydney. Price data was last updated on April 10, 2026.

To ensure you get the cheapest price possible for a flight from Seattle to Sydney, you should look to book at least 24 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 $813). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,582). 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?

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 April 17, 2026.
Read reviews from past customers who have flown ANA,Alaska Airlines, andQantas Airways 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
8.4
Very good
1,178 reviews

Boarding

8.6

Food

7.8

Crew

8.7

Overall

8.4

Comfort

8.2

Entertainment

8.0

Reviews

1 / 20
8.0
Excellent

Alejandro,Apr 2026

SFO - HND

Food was good, not exceptional. On my second flight, Tokyo to Hiroshima, a single cup of coffee was offered, not a bag of pretzels or cookies. Granted, the flight was only an hour and a half, but this seems stingy.
ANA
8.4
Very good
1,178 reviews
ANA
8.4
Very good
1,178 reviews

Boarding

8.6

Food

7.8

Crew

8.7

Overall

8.4

Comfort

8.2

Entertainment

8.0

Reviews

1 / 20
8.0
Excellent

Alejandro,Apr 2026

SFO - HND

Food was good, not exceptional. On my second flight, Tokyo to Hiroshima, a single cup of coffee was offered, not a bag of pretzels or cookies. Granted, the flight was only an hour and a half, but this seems stingy.
Alaska Airlines
7.9
Good
12,253 reviews
ANA
8.4
Very good
1,178 reviews

Boarding

8.6

Food

7.8

Crew

8.7

Overall

8.4

Comfort

8.2

Entertainment

8.0

Reviews

1 / 20
8.0
Excellent

Alejandro,Apr 2026

SFO - HND

Food was good, not exceptional. On my second flight, Tokyo to Hiroshima, a single cup of coffee was offered, not a bag of pretzels or cookies. Granted, the flight was only an hour and a half, but this seems stingy.
Qantas Airways
7.5
Good
1,019 reviews
ANA
8.4
Very good
1,178 reviews

Boarding

8.6

Food

7.8

Crew

8.7

Overall

8.4

Comfort

8.2

Entertainment

8.0

Reviews

1 / 20
8.0
Excellent

Alejandro,Apr 2026

SFO - HND

Food was good, not exceptional. On my second flight, Tokyo to Hiroshima, a single cup of coffee was offered, not a bag of pretzels or cookies. Granted, the flight was only an hour and a half, but this seems stingy.
United Airlines
7.4
Good
9,602 reviews
ANA
8.4
Very good
1,178 reviews

Boarding

8.6

Food

7.8

Crew

8.7

Overall

8.4

Comfort

8.2

Entertainment

8.0

Reviews

1 / 20
8.0
Excellent

Alejandro,Apr 2026

SFO - HND

Food was good, not exceptional. On my second flight, Tokyo to Hiroshima, a single cup of coffee was offered, not a bag of pretzels or cookies. Granted, the flight was only an hour and a half, but this seems stingy.
Air Canada
7.1
Good
10,932 reviews
ANA
8.4
Very good
1,178 reviews

Boarding

8.6

Food

7.8

Crew

8.7

Overall

8.4

Comfort

8.2

Entertainment

8.0

Reviews

1 / 20
8.0
Excellent

Alejandro,Apr 2026

SFO - HND

Food was good, not exceptional. On my second flight, Tokyo to Hiroshima, a single cup of coffee was offered, not a bag of pretzels or cookies. Granted, the flight was only an hour and a half, but this seems stingy.

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 25h 10m. 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 Alaska Airlines, from $591, and Air Canada, from $778. These flights start at 44% 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 ANA, which is currently one of the cheapest options available, starting at $253. Air Canada flights start at $366 while deals on Qantas Airways start at $380 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 L.A. Live are currently the most popular points of interest in Los Angeles at the moment. Hollywood Bowl, Hollywood Walk of Fame and L.A. Live are located about 12.4 mi, 11.7 mi, and 10.9 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 $45 per day.

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

    Orpheum Theatre, Queen Elizabeth Theatre, and Pacific Central Station are currently the most popular points of interest in Vancouver at the moment. Those on a layover in Vancouver interested in visiting Orpheum Theatre, Queen Elizabeth Theatre, or Pacific Central Station can do so by traveling 6.5 mi, 6.6 mi, and 6.6 mi, respectively from Vancouver Intl. Those looking to explore during their layover in Vancouver can rent a car from Vancouver Intl for about $35 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 $813). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,582). 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

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

Top 10 airlines flying from Seattle to Sydney

Discover the top 10 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 April 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$583Average$655FlexibilityNo cancel feeOn-time80%
Alaska AirlinesCheapest$591Average$1,170FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$778Average$1,062FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$789Average$888FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,033FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$1,159FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$833Average$1,127FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,238FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$947Average$1,220FlexibilityNo cancel feeOn-time78%
Alaska AirlinesCheapest$1,126Average$1,268FlexibilityNo cancel feeOn-timeN/A

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