HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$409+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
may. 4 — may. 111
dom. 5/4
dom. 5/11
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.

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 abril 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,002
(KAYAK)

One-way from

$409
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,119
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. 10% potential increase in price ($129 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
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 abril 29, 2025.

This KAYAK deal was found by Cheapflights users on 4/27. 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.
dom. 6/84:30 pmSEA - SYD
1 stop33h 45mANA
mar. 6/178:55 pmSYD - SEA
2 stops38h 41mANA
Deal found 4/27$1,002
This Air Canada deal was found by Cheapflights users on 4/27. 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.
dom. 6/82:55 pmSEA - SYD
2 stops35h 45mAir Canada
mar. 7/87:30 amSYD - SEA
2 stops18h 51mAir Canada
Deal found 4/27$1,003
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
mié. 6/113:55 pmSEA - SYD
1 stop29h 45mMultiple Airlines
mié. 6/184:20 pmSYD - SEA
1 stop24h 04mMultiple Airlines
Deal found 4/28$1,008
This Gurufare deal was found by Cheapflights users on 4/27. 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.
vie. 10/3111:55 pmSEA - SYD
1 stop39h 50mPhilippine Airlines
mié. 11/1911:35 amSYD - SEA
1 stop27h 00mPhilippine Airlines
Deal found 4/27$1,060
This United Airlines deal was found by Cheapflights users on 4/28. 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.
jue. 6/122:30 pmSEA - SYD
2 stops23h 30mUnited Airlines
jue. 6/199:30 amSYD - SEA
2 stops28h 41mUnited Airlines
Deal found 4/28$1,080
This StudentUniverse deal was found by Cheapflights users on 4/27. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/125:10 pmSEA - SYD
2 stops24h 25mAir New Zealand
mié. 8/2011:50 amSYD - SEA
2 stops27h 25mAir New Zealand
Deal found 4/27$1,108
This Delta deal was found by Cheapflights users on 4/27. 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.
lun. 6/305:40 pmSEA - SYD
1 stop19h 55mDelta
lun. 7/79:25 amSYD - SEA
1 stop28h 00mDelta
Deal found 4/27$1,117
This StudentUniverse deal was found by Cheapflights users on 4/27. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/257:20 amSEA - SYD
1 stop30h 10mQantas Airways
sáb. 11/1511:15 amSYD - SEA
1 stop26h 29mQantas Airways
Deal found 4/27$1,138
This Hawaiian Airlines deal was found by Cheapflights users on 4/27. 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.
mié. 8/278:15 amSEA - SYD
1 stop18h 30mHawaiian Airlines
mar. 9/169:40 pmSYD - SEA
1 stop17h 04mHawaiian Airlines
Deal found 4/27$1,152
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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.
jue. 8/288:15 amSEA - SYD
1 stop18h 30mAlaska Airlines
mar. 9/29:40 pmSYD - SEA
1 stop17h 04mAlaska Airlines
Deal found 4/28$1,158
This American Airlines deal was found by Cheapflights users on 4/27. 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.
sáb. 7/510:09 amSEA - SYD
2 stops28h 21mAmerican Airlines
mar. 7/2210:25 amSYD - SEA
1 stop21h 22mAmerican Airlines
Deal found 4/27$1,189

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 abril 29, 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

dom. 6/8

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

mar. 6/17

8:55 pm-6:36 pm

2 stops38h 41m

$1,002

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

dom. 6/8

2:55 pm-7:40 pm

2 stops35h 45m

Sydney Kingsford Smith

mar. 7/8

7:30 am-9:21 am

2 stops18h 51m

$1,003

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mié. 6/11

3:55 pm-2:40 pm

1 stop29h 45m

Sydney Kingsford Smith

mié. 6/18

4:20 pm-11:24 pm

1 stop24h 04m

$1,008

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

jue. 6/12

2:30 pm-7:00 am

2 stops23h 30m

Sydney Kingsford Smith

jue. 6/19

9:30 am-9:11 pm

2 stops28h 41m

$1,080

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mar. 8/12

5:10 pm-10:35 am

2 stops24h 25m

Sydney Kingsford Smith

mié. 8/20

11:50 am-10:15 pm

2 stops27h 25m

$1,108

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

lun. 6/30

5:40 pm-6:35 am

1 stop19h 55m

Sydney Kingsford Smith

lun. 7/7

9:25 am-8:25 pm

1 stop28h 00m

$1,117

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sáb. 10/25

7:20 am-7:30 am

1 stop30h 10m

Sydney Kingsford Smith

sáb. 11/15

11:15 am-6:44 pm

1 stop26h 29m

$1,138

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mié. 8/27

8:15 am-7:45 pm

1 stop18h 30m

Sydney Kingsford Smith

mar. 9/16

9:40 pm-9:44 pm

1 stop17h 04m

$1,152

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

jue. 8/28

8:15 am-7:45 pm

1 stop18h 30m

Sydney Kingsford Smith

mar. 9/2

9:40 pm-9:44 pm

1 stop17h 04m

$1,158

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sáb. 7/5

10:09 am-7:30 am

2 stops28h 21m

Sydney Kingsford Smith

mar. 7/22

10:25 am-2:47 pm

1 stop21h 22m

$1,189

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 24 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 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 25, 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 abril 29, 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 abril 29, 2025.
To help decide which airline to fly from Seattle to Sydney, see what other customers have to say about China Airlines, ANA and Fiji Airways. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
China Airlines
8.3
Very good
729 reviews

Food

7.8

Crew

8.5

Entertainment

8.0

Overall

8.3

Comfort

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
China Airlines
8.3
Very good
729 reviews
China Airlines
8.3
Very good
729 reviews

Food

7.8

Crew

8.5

Entertainment

8.0

Overall

8.3

Comfort

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
ANA
8.3
Very good
855 reviews
China Airlines
8.3
Very good
729 reviews

Food

7.8

Crew

8.5

Entertainment

8.0

Overall

8.3

Comfort

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Fiji Airways
8.1
Very good
190 reviews
China Airlines
8.3
Very good
729 reviews

Food

7.8

Crew

8.5

Entertainment

8.0

Overall

8.3

Comfort

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Delta
8.0
Very good
7,929 reviews
China Airlines
8.3
Very good
729 reviews

Food

7.8

Crew

8.5

Entertainment

8.0

Overall

8.3

Comfort

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Air New Zealand
8.0
Very good
471 reviews
China Airlines
8.3
Very good
729 reviews

Food

7.8

Crew

8.5

Entertainment

8.0

Overall

8.3

Comfort

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver

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 $1,002. Other airlines that can offer you cheap pricing are Air Canada, from $1,003, and United Airlines, from $1,080. These flights start at 12% 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 $469. United Airlines flights start at $511 while deals on Delta start at $529 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 $40 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 $39 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

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.
Seattle to Coolangatta flights
Portland to Sydney flights
Spokane to Sydney flights
Seattle to Newcastle flights
Portland to Coolangatta flights
Pasco to Sydney flights

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 abril 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$759Average$1,133FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$807Average$1,212FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$834Average$1,066FlexibilityNo cancel feeOn-time67%
DeltaCheapest$854Average$1,147FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$858Average$1,144FlexibilityNo cancel feeOn-time85%
ANACheapest$861Average$1,196FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$866Average$1,241FlexibilityNo cancel feeOn-time74%
Alaska AirlinesCheapest$911Average$1,276FlexibilityNo cancel feeOn-time75%

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.