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$522+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
1 adult, Economy
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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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$940
(Kiwi.com)

One-way from

$522
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,035
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
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($120 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 25, 2025.

This Kiwi.com deal was found by Cheapflights users on 3/25. 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.
Wed 5/146:50 pmSEA - SYD
1 stop26h 50mMultiple Airlines
Mon 5/264:20 pmSYD - SEA
1 stop30h 55mMultiple Airlines
Deal found 3/25$929
This lol.travel deal was found by Cheapflights users on 3/24. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/167:15 pmSEA - SYD
1 stop19h 05mAir Canada
Sun 6/19:20 amSYD - SEA
1 stop21h 53mAir Canada
Deal found 3/24$1,012
This Cheapflightsfares deal was found by Cheapflights users on 3/24. 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 8/191:45 pmSEA - SYD
2 stops26h 40mANA
Tue 9/911:50 amSYD - SEA
2 stops23h 46mANA
Deal found 3/24$1,066
This United Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/59:10 amSEA - SYD
1 stop28h 45mUnited Airlines
Mon 5/1210:20 amSYD - SEA
1 stop25h 10mUnited Airlines
Deal found 3/23$1,093
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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.
Sat 5/108:15 amSEA - SYD
1 stop18h 30mAlaska Airlines
Tue 5/279:40 pmSYD - SEA
1 stop25h 35mAlaska Airlines
Deal found 3/25$1,151
This Hawaiian Airlines deal was found by Cheapflights users on 3/24. 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.
Sat 3/297:45 amSEA - SYD
1 stop18h 00mHawaiian Airlines
Sat 4/59:40 pmSYD - SEA
1 stop26h 21mHawaiian Airlines
Deal found 3/24$1,232
This Delta deal was found by Cheapflights users on 3/24. 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 6/287:55 pmSEA - SYD
1 stop41h 40mDelta
Mon 7/79:25 amSYD - SEA
2 stops22h 18mDelta
Deal found 3/24$1,296
This Gurufare deal was found by Cheapflights users on 3/24. 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 4/236:08 amSEA - SYD
1 stop31h 57mQantas Airways
Wed 4/305:45 pmSYD - SEA
1 stop22h 04mQantas Airways
Deal found 3/24$1,378

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 March 25, 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

Wed 5/14

6:50 pm-2:40 pm

1 stop26h 50m

Sydney Kingsford Smith

Mon 5/26

4:20 pm-6:15 am

1 stop30h 55m

$929

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 5/16

7:15 pm-7:20 am

1 stop19h 05m

Sydney Kingsford Smith

Sun 6/1

9:20 am-2:13 pm

1 stop21h 53m

$1,012

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 8/19

1:45 pm-9:25 am

2 stops26h 40m

Sydney Kingsford Smith

Tue 9/9

11:50 am-6:36 pm

2 stops23h 46m

$1,066

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/5

9:10 am-6:55 am

1 stop28h 45m

Sydney Kingsford Smith

Mon 5/12

10:20 am-6:30 pm

1 stop25h 10m

$1,093

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/10

8:15 am-7:45 pm

1 stop18h 30m

Sydney Kingsford Smith

Tue 5/27

9:40 pm-6:15 am

1 stop25h 35m

$1,151

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 4/16

6:50 pm-7:45 pm

1 stop31h 55m

Sydney Kingsford Smith

Fri 4/25

9:40 pm-8:25 am

1 stop27h 45m

$1,266

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 6/28

7:55 pm-6:35 am

1 stop41h 40m

Sydney Kingsford Smith

Mon 7/7

9:25 am-2:43 pm

2 stops22h 18m

$1,296

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 4/23

6:08 am-7:05 am

1 stop31h 57m

Sydney Kingsford Smith

Wed 4/30

5:45 pm-10:49 pm

1 stop22h 04m

$1,378

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/6

1:10 am-7:20 am

2 stops37h 10m

$585

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/6

11:35 pm-8:00 am

1 stop39h 25m

$609

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 21 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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
FlightHubPrice Accuracy3 starsTrust Score*3 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 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 March 21, 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, March is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,044). 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 March 25, 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 March 25, 2025.
To help decide which airline to fly from Seattle to Sydney, see what other customers have to say about ANA, China Airlines and Asiana Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.3
Very good
825 reviews

Food

7.6

Overall

8.3

Boarding

8.5

Crew

8.7

Entertainment

7.9

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
ANA
8.3
Very good
825 reviews
ANA
8.3
Very good
825 reviews

Food

7.6

Overall

8.3

Boarding

8.5

Crew

8.7

Entertainment

7.9

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
China Airlines
8.2
Very good
722 reviews
ANA
8.3
Very good
825 reviews

Food

7.6

Overall

8.3

Boarding

8.5

Crew

8.7

Entertainment

7.9

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Asiana Airlines
8.2
Very good
442 reviews
ANA
8.3
Very good
825 reviews

Food

7.6

Overall

8.3

Boarding

8.5

Crew

8.7

Entertainment

7.9

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Alaska Airlines
8.0
Very good
9,785 reviews
ANA
8.3
Very good
825 reviews

Food

7.6

Overall

8.3

Boarding

8.5

Crew

8.7

Entertainment

7.9

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Fiji Airways
8.0
Very good
182 reviews
ANA
8.3
Very good
825 reviews

Food

7.6

Overall

8.3

Boarding

8.5

Crew

8.7

Entertainment

7.9

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.

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 $1,012. Other airlines that can offer you cheap pricing are United Airlines, from $1,093, and Alaska Airlines, from $1,157. These flights start at 11% 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 Philippine Airlines, which is currently one of the cheapest options available, starting at $588. Hawaiian Airlines flights start at $669 while deals on Qantas Airways start at $670 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 $38 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 $34 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, March is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,044). 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
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Coogee
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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
Seattle to Coolangatta 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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$759Average$1,139FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$807Average$1,199FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$834Average$1,079FlexibilityNo cancel feeOn-time67%
Alaska AirlinesCheapest$854Average$1,262FlexibilityNo cancel feeOn-time75%
DeltaCheapest$855Average$1,145FlexibilityNo cancel feeOn-timeN/A
ANACheapest$861Average$1,196FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$866Average$1,279FlexibilityNo cancel feeOn-time74%
Hawaiian AirlinesCheapest$879Average$1,145FlexibilityNo cancel feeOn-time85%
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