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$392+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$777
(Air Canada)

One-way from

$392
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,089
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 ($139 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 June 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 junio 12, 2025.

This Air Canada deal was found by Cheapflights users on 6/11. 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. 9/72:55 pmSEA - SYD
1 stop23h 25mAir Canada
mar. 9/169:20 amSYD - SEA
1 stop20h 46mAir Canada
Deal found 6/11$777
This Cheapflightsfares deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/272:32 pmSEA - SYD
1 stop23h 58mQantas Airways
mar. 9/169:10 amSYD - SEA
1 stop20h 40mQantas Airways
Deal found 6/12$793
This Flighttix deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/46:09 pmSEA - SYD
1 stop20h 21mMultiple Airlines
dom. 8/179:10 amSYD - SEA
1 stop18h 39mMultiple Airlines
Deal found 6/12$821
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/22:30 pmSEA - SYD
1 stop24h 00mAmerican Airlines
dom. 8/245:45 pmSYD - SEA
1 stop20h 48mAmerican Airlines
Deal found 6/12$835
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/19:25 pmSEA - SYD
1 stop40h 10mDelta
jue. 8/149:25 amSYD - SEA
1 stop20h 09mDelta
Deal found 6/12$843
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/45:10 amSEA - SYD
1 stop32h 45mUnited Airlines
dom. 8/179:30 amSYD - SEA
2 stops23h 24mUnited Airlines
Deal found 6/12$845
This Cheapflightsfares deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/2710:00 amSEA - SYD
2 stops30h 25mANA
mar. 9/1611:50 amSYD - SEA
2 stops23h 46mANA
Deal found 6/12$896
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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. 12/45:40 pmSEA - SYD
1 stop20h 20mAlaska Airlines
lun. 3/211:15 amSYD - SEA
1 stop20h 41mAlaska Airlines
Deal found 6/10$912
This oojo deal was found by Cheapflights users on 6/11. 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.
mié. 10/811:35 pmSEA - SYD
1 stop39h 25mPhilippine Airlines
dom. 10/1211:10 amSYD - SEA
1 stop26h 05mPhilippine Airlines
Deal found 6/11$987

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 junio 12, 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. 9/7

2:55 pm-7:20 am

1 stop23h 25m

Sydney Kingsford Smith

mar. 9/16

9:20 am-1:06 pm

1 stop20h 46m

$777

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mié. 8/27

2:32 pm-7:30 am

1 stop23h 58m

Sydney Kingsford Smith

mar. 9/16

9:10 am-12:50 pm

1 stop20h 40m

$793

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

lun. 8/4

6:09 pm-7:30 am

1 stop20h 21m

Sydney Kingsford Smith

dom. 8/17

9:10 am-10:49 am

1 stop18h 39m

$821

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sáb. 8/2

2:30 pm-7:30 am

1 stop24h 00m

Sydney Kingsford Smith

dom. 8/24

5:45 pm-9:33 pm

1 stop20h 48m

$835

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

vie. 8/1

5:10 am-6:55 am

1 stop32h 45m

Sydney Kingsford Smith

lun. 8/11

9:30 am-8:57 pm

2 stops28h 27m

$843

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

dom. 8/3

2:24 pm-6:35 am

1 stop23h 11m

Sydney Kingsford Smith

sáb. 8/16

9:25 am-12:34 pm

1 stop20h 09m

$850

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mié. 8/27

10:00 am-9:25 am

2 stops30h 25m

Sydney Kingsford Smith

mar. 9/16

11:50 am-6:36 pm

2 stops23h 46m

$896

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

jue. 12/4

5:40 pm-9:00 am

1 stop20h 20m

Sydney Kingsford Smith

lun. 3/2

11:15 am-12:56 pm

1 stop20h 41m

$912

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mié. 10/8

11:35 pm-9:00 am

1 stop39h 25m

Sydney Kingsford Smith

dom. 10/12

11:10 am-7:15 pm

1 stop26h 05m

$987

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mar. 9/9

8:00 am-2:40 pm

2 stops37h 40m

$392

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 25 results
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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 June 9, 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 $1,041). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,635). 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 junio 12, 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 junio 12, 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
738 reviews

Food

7.8

Boarding

8.3

Entertainment

8.0

Overall

8.3

Comfort

8.0

Crew

8.5

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
738 reviews
China Airlines
8.3
Very good
738 reviews

Food

7.8

Boarding

8.3

Entertainment

8.0

Overall

8.3

Comfort

8.0

Crew

8.5

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
882 reviews
China Airlines
8.3
Very good
738 reviews

Food

7.8

Boarding

8.3

Entertainment

8.0

Overall

8.3

Comfort

8.0

Crew

8.5

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
194 reviews
China Airlines
8.3
Very good
738 reviews

Food

7.8

Boarding

8.3

Entertainment

8.0

Overall

8.3

Comfort

8.0

Crew

8.5

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
7,950 reviews
China Airlines
8.3
Very good
738 reviews

Food

7.8

Boarding

8.3

Entertainment

8.0

Overall

8.3

Comfort

8.0

Crew

8.5

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
483 reviews
China Airlines
8.3
Very good
738 reviews

Food

7.8

Boarding

8.3

Entertainment

8.0

Overall

8.3

Comfort

8.0

Crew

8.5

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 $777. Other airlines that can offer you cheap pricing are Qantas Airways, from $793, and American Airlines, from $835. These flights start at 31% 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 Qantas Airways, which is currently one of the cheapest options available, starting at $401. American Airlines flights start at $428 while deals on United Airlines start at $431 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, Orpheum Theatre, and Capilano Suspension Bridge 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, Orpheum Theatre, or Capilano Suspension Bridge can do so by traveling 6.6 mi, 6.5 mi, and 10.6 mi, respectively from Vancouver Intl. Those looking to explore during their layover in Vancouver can rent a car from Vancouver Intl 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 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 $1,041). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,635). 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
Manly
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.
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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$791Average$1,139FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$807Average$1,148FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$807Average$1,199FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$831Average$1,143FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$833Average$1,061FlexibilityNo cancel feeOn-time67%
Hawaiian AirlinesCheapest$858Average$1,150FlexibilityNo cancel feeOn-time85%
DeltaCheapest$859Average$1,152FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$911Average$1,268FlexibilityNo cancel feeOn-time75%

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