HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$599+ 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 1/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Sydney with Cheapflights

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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Seattle/Tacoma Intl to Sydney Kingsford Smith are usually found in March or April, booked 37 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 December 18, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$901
(Air Canada)

One-way from

$599
(United Airlines)

Popular in

December

Cheapest in

March

Average price

$1,493
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
High demand for flights, 9% potential price rise
Search Deals
Best time to find cheap flights, 3% potential price drop
Search Deals
Average for round-trip flights in December 2024
Search Deals

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 December 18, 2024.

This United Airlines deal was found by Cheapflights users on 12/18. 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.
Tue 12/246:13 pmSEA - SYD
1 stop41h 07mUnited Airlines
Fri 1/312:10 pmSYD - SEA
1 stop28h 05mUnited Airlines
Deal found 12/18$1,424
This Mytrip deal was found by Cheapflights users on 12/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3112:10 amSEA - SYD
3 stops43h 40mMultiple Airlines
Fri 2/72:00 pmSYD - SEA
3 stops29h 19mMultiple Airlines
Deal found 12/17$1,713
This FlightHub deal was found by Cheapflights users on 12/18. 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.
Thu 12/2612:45 pmSEA - SYD
1 stop24h 35mAsiana Airlines
Sat 1/1810:20 amSYD - SEA
1 stop43h 35mAsiana Airlines
Deal found 12/18$2,227
This Gotogate deal was found by Cheapflights users on 12/17. 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.
Tue 12/3112:10 amSEA - SYD
1 stop41h 00mChina Airlines
Fri 2/710:10 pmSYD - SEA
1 stop39h 05mChina Airlines
Deal found 12/17$2,469
This Ovago deal was found by Cheapflights users on 12/17. 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.
Mon 12/3010:35 amSEA - SYD
2 stops28h 50mAir New Zealand
Mon 1/611:45 amSYD - SEA
2 stops29h 15mAir New Zealand
Deal found 12/17$2,484
This Justfly.com deal was found by Cheapflights users on 12/18. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/276:21 amSEA - SYD
2 stops37h 34mQantas Airways
Sun 1/511:15 amSYD - SEA
1 stop26h 37mQantas Airways
Deal found 12/18$2,718
This KAYAK deal was found by Cheapflights users on 12/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/263:59 pmSEA - SYD
3 stops26h 01mFiji Airways
Sat 1/183:20 pmSYD - SEA
2 stops24h 00mFiji Airways
Deal found 12/17$2,788
This Korean Air deal was found by Cheapflights users on 12/17. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/215:30 pmSEA - SYD
2 stops42h 25mKorean Air
Sun 1/59:10 amSYD - SEA
1 stop23h 09mKorean Air
Deal found 12/17$2,915
This Air Canada deal was found by Cheapflights users on 12/18. 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.
Mon 12/237:15 pmSEA - SYD
2 stops31h 30mAir Canada
Fri 1/39:00 amSYD - SEA
2 stops19h 50mAir Canada
Deal found 12/18$3,069
This oojo deal was found by Cheapflights users on 12/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1910:51 pmSEA - SYD
2 stops39h 44mCathay Pacific
Thu 1/211:05 amSYD - SEA
2 stops39h 04mCathay Pacific
Deal found 12/17$3,783
This Hawaiian Airlines deal was found by Cheapflights users on 12/17. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/208:35 amSEA - SYD
1 stop40h 10mHawaiian Airlines
Sat 1/49:40 pmSYD - SEA
1 stop26h 30mHawaiian Airlines
Deal found 12/17$4,045
This Lufthansa deal was found by Cheapflights users on 12/17. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/243:10 pmSEA - SYD
2 stops43h 45mLufthansa
Fri 1/3110:25 amSYD - SEA
2 stops44h 45mLufthansa
Deal found 12/17$4,230

Find flights from Seattle to Sydney within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 3/5

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Sat 3/8

9:15 pm-8:50 am

2 stops30h 35m

$901

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/5

5:45 am-9:35 am

1 stop32h 50m

Sydney Kingsford Smith

Tue 2/25

9:00 am-9:50 am

2 stops19h 50m

$903

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 3/5

10:35 pm-9:30 am

1 stop39h 55m

Sydney Kingsford Smith

Wed 3/19

11:10 am-7:10 pm

1 stop26h 00m

$997

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/20

1:45 pm-9:25 am

2 stops26h 40m

Sydney Kingsford Smith

Thu 6/5

11:50 am-6:33 pm

2 stops23h 43m

$1,086

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 1/28

2:00 pm-8:35 am

1 stop23h 35m

Sydney Kingsford Smith

Mon 2/24

2:15 pm-4:59 pm

1 stop21h 44m

$1,121

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/27

7:00 am-7:00 am

1 stop29h 00m

Sydney Kingsford Smith

Tue 3/4

4:15 pm-6:29 pm

1 stop21h 14m

$1,131

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 2/20

7:00 am-7:45 pm

1 stop17h 45m

Sydney Kingsford Smith

Sat 3/8

9:40 pm-9:00 pm

1 stop18h 20m

$1,140

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 3/5

7:00 am-7:45 pm

1 stop17h 45m

Sydney Kingsford Smith

Fri 3/7

9:40 pm-9:20 pm

1 stop18h 40m

$1,156

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 1/31

12:50 pm-9:15 am

1 stop25h 25m

Sydney Kingsford Smith

Fri 2/7

12:10 pm-3:45 pm

1 stop22h 35m

$1,167

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 1/1

3:11 pm-6:20 am

1 stop20h 09m

$599

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 22 results
1
2
3

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*2 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
JetabroadPrice Accuracy3 starsTrust Score*3 stars
OneTravelPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy2 starsTrust Score*2 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 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.

Travel insights for flights from Seattle to Sydney

Get recent, data-driven insights about flights from Seattle to Sydney including ideal travel times, pricing trends, and more.

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 December 13, 2024.

To ensure you get the cheapest price possible for a flight from Seattle to Sydney, you should look to book at least 37 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 $1,051). 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 December 18, 2024.

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 December 18, 2024.
To help decide which airline to fly from Seattle to Sydney, see what other customers have to say about Lufthansa, Philippine Airlines and ANA. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.6
Very good
65 reviews

Comfort

8.0

Crew

8.9

Overall

8.6

Food

7.7

Boarding

8.5

Entertainment

7.2

Reviews

1 / 2

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
8.6
Very good
65 reviews
Air Tahiti Nui
8.6
Very good
65 reviews

Comfort

8.0

Crew

8.9

Overall

8.6

Food

7.7

Boarding

8.5

Entertainment

7.2

Reviews

1 / 2

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
8.4
Very good
839 reviews
Air Tahiti Nui
8.6
Very good
65 reviews

Comfort

8.0

Crew

8.9

Overall

8.6

Food

7.7

Boarding

8.5

Entertainment

7.2

Reviews

1 / 2

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
8.3
Very good
477 reviews
Air Tahiti Nui
8.6
Very good
65 reviews

Comfort

8.0

Crew

8.9

Overall

8.6

Food

7.7

Boarding

8.5

Entertainment

7.2

Reviews

1 / 2

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
8.3
Very good
754 reviews
Air Tahiti Nui
8.6
Very good
65 reviews

Comfort

8.0

Crew

8.9

Overall

8.6

Food

7.7

Boarding

8.5

Entertainment

7.2

Reviews

1 / 2

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
8.1
Very good
191 reviews
Air Tahiti Nui
8.6
Very good
65 reviews

Comfort

8.0

Crew

8.9

Overall

8.6

Food

7.7

Boarding

8.5

Entertainment

7.2

Reviews

1 / 2

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 $903. Other airlines that can offer you cheap pricing are Philippine Airlines, from $997, and ANA, from $1,086. These flights start at 19% 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 United Airlines, which is currently one of the cheapest options available, starting at $599. Delta flights start at $603 while deals on ANA start at $606 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. San Francisco 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 $40 per day.

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

    Fisherman's Wharf, Union Square, and Bill Graham Civic Auditorium are currently the most popular points of interest in San Francisco at the moment. Those on a layover in San Francisco interested in visiting Fisherman's Wharf, Union Square, or Bill Graham Civic Auditorium can do so by traveling 13.0 mi, 11.6 mi, and 11.1 mi, respectively from San Francisco. Those looking to explore during their layover in San Francisco can rent a car from San Francisco for about $50 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 Vancouver 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 $1,051). 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

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.

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
Seattle to Coolangatta flights
Spokane to Sydney flights
Portland to Coolangatta flights
Seattle to Newcastle flights
Pasco 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$759Average$1,084FlexibilityNo cancel feeOn-time69%
ANACheapest$767Average$1,433FlexibilityNo cancel feeOn-time80%
Air CanadaCheapest$796Average$1,076FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$836Average$1,268FlexibilityNo cancel feeOn-time74%
DeltaCheapest$838Average$1,132FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$839Average$1,264FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$881Average$1,127FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$941Average$1,234FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$1,202Average$1,331FlexibilityNo cancel feeOn-time78%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.