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$426+ 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 6/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Apr 20 — Apr 271
Sun 4/20
Sun 4/27
1 adult, Economy
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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Sydney Kingsford Smith are usually found in March or February, booked 9 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Cheap 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 15, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$859
(Kiwi.com)

One-way from

$464
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,109
Provider with most accurate pricing for Seattle/Tacoma Intl-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sydney Kingsford Smith flights.
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From Seattle/Tacoma Intl to Sydney Kingsford Smith
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One-way flight from Seattle/Tacoma Intl to Sydney Kingsford Smith
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Highest demand for flights based on searches. 10% potential increase in price ($130 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find 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 15, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/156:25 pmSEA - SYD
1 stop27h 15mMultiple Airlines
Thu 5/294:20 pmSYD - SEA
1 stop33h 15mMultiple Airlines
Deal found 4/14$859
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1711:35 pmSEA - SYD
1 stop39h 25mPhilippine Airlines
Sun 10/511:10 amSYD - SEA
1 stop26h 05mPhilippine Airlines
Deal found 4/14$947
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:15 pmSEA - SYD
1 stop19h 05mAir Canada
Thu 10/3010:20 amSYD - SEA
1 stop17h 30mAir Canada
Deal found 4/14$1,047
This BestPriceTravel 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/146:14 amSEA - SYD
1 stop31h 51mQantas Airways
Thu 8/145:45 pmSYD - SEA
1 stop19h 04mQantas Airways
Deal found 4/14$1,100
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/261:45 pmSEA - SYD
2 stops26h 40mANA
Tue 9/911:50 amSYD - SEA
2 stops23h 46mANA
Deal found 4/14$1,105
This BestPriceTravel 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/58:15 amSEA - SYD
1 stop18h 30mHawaiian Airlines
Thu 5/159:40 pmSYD - SEA
1 stop25h 35mHawaiian Airlines
Deal found 4/15$1,113
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/58:15 amSEA - SYD
1 stop18h 30mAlaska Airlines
Tue 6/39:40 pmSYD - SEA
2 stops25h 55mAlaska Airlines
Deal found 4/14$1,155
This Ovago 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/105:50 pmSEA - SYD
2 stops46h 10mChina Eastern
Sat 5/2411:00 amSYD - SEA
2 stops46h 45mChina Eastern
Deal found 4/14$1,166
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/235:14 pmSEA - SYD
2 stops24h 21mAir New Zealand
Wed 7/309:55 amSYD - SEA
2 stops29h 11mAir New Zealand
Deal found 4/15$1,207
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/88:50 amSEA - SYD
2 stops29h 10mUnited Airlines
Wed 5/2110:20 amSYD - SEA
1 stop25h 10mUnited Airlines
Deal found 4/15$1,224
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/145:30 amSEA - SYD
2 stops32h 05mDelta
Sat 6/289:25 amSYD - SEA
2 stops26h 04mDelta
Deal found 4/14$1,243

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 15, 2025.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Seattle

Fly to

Sydney

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 5/15

6:25 pm-2:40 pm

1 stop27h 15m

Sydney Kingsford Smith

Thu 5/29

4:20 pm-8:35 am

1 stop33h 15m

$859

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 9/17

11:35 pm-8:00 am

1 stop39h 25m

Sydney Kingsford Smith

Sun 10/5

11:10 am-7:15 pm

1 stop26h 05m

$947

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 9/7

2:55 pm-7:20 am

1 stop23h 25m

Sydney Kingsford Smith

Tue 9/16

9:20 am-2:16 pm

1 stop21h 56m

$1,050

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/14

6:14 am-7:05 am

1 stop31h 51m

Sydney Kingsford Smith

Thu 8/14

5:45 pm-7:49 pm

1 stop19h 04m

$1,100

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 8/26

1:45 pm-9:25 am

2 stops26h 40m

Sydney Kingsford Smith

Tue 9/9

11:50 am-6:36 pm

2 stops23h 46m

$1,105

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/5

8:15 am-7:45 pm

1 stop18h 30m

Sydney Kingsford Smith

Thu 5/15

9:40 pm-6:15 am

1 stop25h 35m

$1,113

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/5

8:15 am-7:45 pm

1 stop18h 30m

Sydney Kingsford Smith

Tue 6/3

9:40 pm-6:35 am

2 stops25h 55m

$1,155

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/10

5:50 pm-9:00 am

2 stops46h 10m

Sydney Kingsford Smith

Sat 5/24

11:00 am-4:45 pm

2 stops46h 45m

$1,166

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 7/23

5:14 pm-10:35 am

2 stops24h 21m

Sydney Kingsford Smith

Wed 7/30

9:55 am-10:06 pm

2 stops29h 11m

$1,207

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 5/8

8:50 am-7:00 am

2 stops29h 10m

Sydney Kingsford Smith

Wed 5/21

10:20 am-6:30 pm

1 stop25h 10m

$1,224

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 28 results
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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
AranGrantPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Seattle-Sydney flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 11, 2025.

To ensure you get the cheapest price possible for a flight from Seattle to Sydney, you should look to book at least 9 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, February is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,046). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,643). 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.

What is the cheapest time of day to fly from SEA to SYD?

Find hourly flight availability from Seattle to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 15, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Sydney in the evening. If you’re flexible enough to do this you can expect to save up to 7% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Seattle to Sydney?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Sydney. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Sydney flight should consider departing on Tuesday evenings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sydney ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Sydney when rainfall is around 2.0 in.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

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 15, 2025.
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Food

7.8

Crew

9.1

Boarding

8.7

Overall

8.8

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.8
Very good
62 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Food

7.8

Crew

9.1

Boarding

8.7

Overall

8.8

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very good
841 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Food

7.8

Crew

9.1

Boarding

8.7

Overall

8.8

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
China Airlines
8.2
Very good
729 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Food

7.8

Crew

9.1

Boarding

8.7

Overall

8.8

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Asiana Airlines
8.2
Very good
438 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Food

7.8

Crew

9.1

Boarding

8.7

Overall

8.8

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Fiji Airways
8.0
Very good
183 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Food

7.8

Crew

9.1

Boarding

8.7

Overall

8.8

Entertainment

7.3

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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.

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

    Cheapflights users have booked flights from Seattle to Sydney round-trip from $1,084. Other airlines that can offer you cheap pricing are Qantas Airways, from $1,100, and ANA, from $1,112. These flights start at 4% 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 Hawaiian Airlines, which is currently one of the cheapest options available, starting at $686. Alaska Airlines flights start at $695 while deals on Qantas Airways start at $696 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 12.5 mi, 11.7 mi, and 10.8 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 $39 per day.

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

    Pacific Central Station, Queen Elizabeth Theatre, and Vancouver Harbour Centre are currently the most popular points of interest in Vancouver at the moment. Those on a layover in Vancouver interested in visiting Pacific Central Station, Queen Elizabeth Theatre, or Vancouver Harbour Centre can do so by traveling 6.6 mi, 6.6 mi, and 6.9 mi, respectively from Vancouver Intl. Those looking to explore during their layover in Vancouver can rent a car from Vancouver Intl for about $38 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, February is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,046). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,643). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Wollongong
Parramatta
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
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Top 8 airlines flying from Seattle to Sydney

Discover the top 8 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$759Average$1,140FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$807Average$1,199FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$834Average$1,069FlexibilityNo cancel feeOn-time67%
DeltaCheapest$854Average$1,141FlexibilityNo cancel feeOn-timeN/A
ANACheapest$861Average$1,196FlexibilityNo cancel feeOn-time80%
Hawaiian AirlinesCheapest$862Average$1,153FlexibilityNo cancel feeOn-time85%
Qantas AirwaysCheapest$866Average$1,259FlexibilityNo cancel feeOn-time74%
Alaska AirlinesCheapest$911Average$1,274FlexibilityNo cancel feeOn-time75%

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