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

Flying on Alaska Airlines is currently your cheapest option to Sydney, with prices starting at $1,124. Additional round-trip tickets that might be worth considering are offered by Qantas Airways and Air Canada, with the lowest prices starting at $1,188 and $1,199, respectively. Users have found that Alaska Airlines is 34% cheaper than the other options available to this destination. Find deals

What are the cheapest airlines to fly from Seattle to Sydney one-way?

The cheapet airlines for a one-way flight from Seattle to Sydney are Alaska Airlines ($572), Qantas Airways ($586), and American Airlines ($592). Find deals

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

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

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm.

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 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

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

Users have found that flying from Seattle to Sydney on a Friday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

How far in advance should I book a flight from Seattle to Sydney?

To save up to 9% on this flight, we recommend booking at least 10 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle to Sydney from $1,339 1-2 weeks out and tickets from $1,696 for flights departing within the next 72 hours.

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

Flights from Seattle to Sydney lean towards being more expensive in December. Prices are generally better when you fly from Seattle to Sydney in March, with the cheapest ticket starting at $1,277.

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 holiday 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.

$572+ Flights from Seattle to Sydney

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 Monday or Wednesday and return on a Thursday

Cheap flight deals from Seattle to Sydney

Round-trip from	$1,124
One-way from	$572
Popular in	December
Cheapest in	March
Average price	$1,657

Alaska Airlines
6/8-27/8
2 total stops
38h 04m total
Seattle to Sydney

Search Deals

Alaska Airlines
2/8
1 total stop
24h 10m total
Seattle to Sydney

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($318 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($70 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 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 4 July 2025.

Wed 6/818:45SEA - SYD

1 stop19h 20mAlaska Airlines

Mon 25/809:10SYD - SEA

1 stop22h 38mAlaska Airlines

Deal found 30/6$1,124

Wed 6/818:09SEA - SYD

1 stop20h 21mQantas Airways

Thu 28/809:10SYD - SEA

1 stop29h 23mQantas Airways

Deal found 1/7$1,188

Sun 7/914:55SEA - SYD

1 stop23h 25mAir Canada

Tue 16/909:20SYD - SEA

1 stop26h 16mAir Canada

Deal found 3/7$1,199

Fri 8/806:45SEA - SYD

1 stop31h 15mUnited Airlines

Thu 21/809:30SYD - SEA

2 stops28h 24mUnited Airlines

Deal found 3/7$1,220

Mon 4/814:30SEA - SYD

1 stop24h 00mAmerican Airlines

Mon 18/809:10SYD - SEA

2 stops24h 32mAmerican Airlines

Deal found 3/7$1,229

Sat 2/817:59SEA - SYD

1 stop20h 31mMultiple Airlines

Sun 24/821:30SYD - SEA

1 stop17h 42mMultiple Airlines

Deal found 2/7$1,240

Best flights from Seattle to Sydney
Discover carefully curated flight deals from Seattle to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 4 July 2025.

Wed 6/818:45SEA - SYD

1 stop19h 20mAlaska Airlines

Wed 27/809:10SYD - SEA

1 stop18h 44mAlaska Airlines

Deal found 1/7$1,124

Wed 6/818:09SEA - SYD

1 stop20h 21mQantas Airways

Thu 28/809:10SYD - SEA

1 stop29h 23mQantas Airways

Deal found 1/7$1,188

Sun 7/914:55SEA - SYD

1 stop23h 25mAir Canada

Tue 16/909:20SYD - SEA

1 stop26h 16mAir Canada

Deal found 3/7$1,199

Fri 8/806:45SEA - SYD

1 stop31h 15mUnited Airlines

Thu 21/809:30SYD - SEA

2 stops28h 24mUnited Airlines

Deal found 3/7$1,220

Mon 4/814:30SEA - SYD

1 stop24h 00mAmerican Airlines

Mon 18/809:10SYD - SEA

2 stops24h 32mAmerican Airlines

Deal found 3/7$1,229

Sat 2/817:59SEA - SYD

1 stop20h 31mMultiple Airlines

Sun 24/821:30SYD - SEA

1 stop17h 42mMultiple Airlines

Deal found 2/7$1,240

Mon 4/814:24SEA - SYD

1 stop23h 11mDelta

Mon 18/809:25SYD - SEA

2 stops24h 13mDelta

Deal found 3/7$1,272

Last-minute flights from Seattle to Sydney
Discover last-minute flight deals from Seattle to Sydney. Data last updated 4 July 2025 and is based on user searches.

Tue 8/701:40SEA - SYD

1 stop40h 05mChina Airlines

Fri 18/722:10SYD - SEA

1 stop38h 35mChina Airlines

Deal found 1/7$3,098

Wed 9/717:14SEA - SYD

1 stop20h 46mUnited Airlines

Tue 15/709:30SYD - SEA

2 stops23h 24mUnited Airlines

Deal found 1/7$1,296

Thu 10/716:42SEA - SYD

1 stop20h 23mMultiple Airlines

Wed 30/717:45SYD - SEA

1 stop19h 15mMultiple Airlines

Deal found 2/7$1,260

Thu 10/718:25SEA - SYD

3 stops24h 50mFiji Airways

Wed 30/713:15SYD - SEA

2 stops25h 26mFiji Airways

Deal found 2/7$4,592

Thu 10/713:33SEA - SYD

3 stops46h 47mBritish Airways

Wed 30/714:40SYD - SEA

3 stops43h 15mBritish Airways

Deal found 2/7$11,326

Sat 12/718:55SEA - SYD

2 stops31h 20mSingapore Airlines

Fri 18/715:00SYD - SEA

3 stops46h 10mSingapore Airlines

Deal found 2/7$7,857

Sat 2/817:59SEA - SYD

1 stop20h 31mMultiple Airlines

Sun 24/821:30SYD - SEA

1 stop17h 42mMultiple Airlines

Deal found 2/7$1,240

Mon 4/814:30SEA - SYD

1 stop24h 00mAmerican Airlines

Mon 18/809:10SYD - SEA

2 stops24h 32mAmerican Airlines

Deal found 3/7$1,229

Mon 4/814:24SEA - SYD

1 stop23h 11mDelta

Mon 18/809:25SYD - SEA

2 stops24h 13mDelta

Deal found 3/7$1,272

Wed 6/818:45SEA - SYD

1 stop19h 20mAlaska Airlines

Mon 25/809:10SYD - SEA

1 stop22h 38mAlaska Airlines

Deal found 30/6$1,124

Wed 6/818:09SEA - SYD

1 stop20h 21mQantas Airways

Thu 28/809:10SYD - SEA

1 stop29h 23mQantas Airways

Deal found 1/7$1,188

Fri 8/806:45SEA - SYD

1 stop31h 15mUnited Airlines

Thu 21/809:30SYD - SEA

2 stops28h 24mUnited Airlines

Deal found 3/7$1,220

One-way flights from Seattle to Sydney
Search for one-way flight options from Seattle to Sydney. Find affordable one-way fares based on user searches. Data last updated 4 July 2025.

Sat 2/813:55SEA - SYD

1 stop24h 10mAlaska Airlines

Deal found 1/7$572

Wed 6/817:15SEA - SYD

1 stop20h 50mQantas Airways

Deal found 1/7$586

Tue 5/808:00SEA - SYD

1 stop30h 05mAmerican Airlines

Deal found 1/7$592

Mon 11/818:09SEA - SYD

1 stop20h 21mMultiple Airlines

Deal found 2/7$598

Mon 29/913:00SEA - SYD

1 stop24h 55mUnited Airlines

Deal found 2/7$604

Sat 2/807:10SEA - SYD

2 stops54h 25mDelta

Deal found 1/7$638

Sun 6/714:55SEA - SYD

1 stop23h 25mAir Canada

Deal found 2/7$872

Sun 20/723:35SEA - SYD

1 stop39h 25mPhilippine Airlines

Deal found 1/7$1,316

Sun 10/801:40SEA - SYD

1 stop40h 05mChina Airlines

Deal found 2/7$1,450

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 6/8

18:45-07:05

1 stop19h 20m

Sydney Kingsford Smith

Wed 27/8

09:10-10:54

1 stop18h 44m

$1,124

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 6/8

18:09-07:30

1 stop20h 21m

Sydney Kingsford Smith

Thu 28/8

09:10-21:33

1 stop29h 23m

$1,188

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/9

14:55-07:20

1 stop23h 25m

Sydney Kingsford Smith

Tue 16/9

09:20-18:36

1 stop26h 16m

$1,199

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 8/8

06:45-07:00

1 stop31h 15m

Sydney Kingsford Smith

Thu 21/8

09:30-20:54

2 stops28h 24m

$1,220

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/8

14:30-07:30

1 stop24h 00m

Sydney Kingsford Smith

Mon 18/8

09:10-16:42

2 stops24h 32m

$1,229

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/8

17:59-07:30

1 stop20h 31m

Sydney Kingsford Smith

Sun 24/8

21:30-22:12

1 stop17h 42m

$1,240

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/8

07:10-06:35

2 stops30h 25m

Sydney Kingsford Smith

Mon 18/8

09:25-16:38

2 stops24h 13m

$1,272

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/8

13:55-07:05

1 stop24h 10m

$572

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 6/8

17:15-07:05

1 stop20h 50m

$586

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/8

08:00-07:05

1 stop30h 05m

$592

Flights are sorted by cheapest return flights first.

Deals found on 1/7

Showing 1-10 of 16 results

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 return 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?

The price you pay for your flight from Seattle to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 9 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Sydney?

Currently, May is the cheapest month in which you can book a flight from Seattle to Sydney (average of $129). Flying from Seattle to Sydney in October is currently the most expensive (average of $171). 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?

A simple way to save on the total cost of your ticket is to fly from Seattle to Sydney at midday. If you’re flexible enough to do this you can expect to save up to 19% on your trip compared to booking a flight in the morning.

How much does it cost for a return flight from Seattle to Sydney?

Reviews of airlines servicing Sydney

Get a feel of what it's like to fly with China Airlines, Alaska Airlines, andDelta from Seattle to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

China Airlines

8.3

Very Good

744 reviews

Check prices

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

744 reviews

China Airlines

8.3

Very Good

744 reviews

Check prices

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

Alaska Airlines

8.0

Very Good

10,000 reviews

China Airlines

8.3

Very Good

744 reviews

Check prices

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

7,982 reviews

China Airlines

8.3

Very Good

744 reviews

Check prices

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

Qantas Airways

7.5

Good

868 reviews

China Airlines

8.3

Very Good

744 reviews

Check prices

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

United Airlines

7.4

Good

8,844 reviews

China Airlines

8.3

Very Good

744 reviews

Check prices

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

What are the cheapest airlines flying from Seattle to Sydney round-trip?
Flying on Alaska Airlines is currently your cheapest option to Sydney, with prices starting at $1,124. Additional round-trip tickets that might be worth considering are offered by Qantas Airways and Air Canada, with the lowest prices starting at $1,188 and $1,199, respectively. Users have found that Alaska Airlines is 34% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Seattle to Sydney one-way?
The cheapet airlines for a one-way flight from Seattle to Sydney are Alaska Airlines ($572), Qantas Airways ($586), and American Airlines ($592).
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 holiday 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, May is the cheapest month in which you can book a flight from Seattle to Sydney (average of $129). Flying from Seattle to Sydney in October is currently the most expensive (average of $171). 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

Parramatta

Wollongong

Katoomba

Manly

Penrith

Coogee

Randwick

Cronulla

Terrigal

Lithgow

Bondi Beach

Leura

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to Sydney

Portland to Sydney flights

Spokane to Sydney flights

Seattle to Coolangatta flights

Portland to Coolangatta flights

Direct flights to New South Wales

Other flights to Sydney

Top 2 airlines flying from Seattle to Sydney

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$1,249	Average$1,717	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	Cheapest$1,279	Average$1,613	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

How does Cheapflights help users find flights from Seattle to Sydney?

Deals for Seattle to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Sydney with no change fees?

Need flexible booking options for your flight to Sydney from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Sydney become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Sydney flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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.

Cheap flights from Seattle to Sydney from $572

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 2/8. Fares are subject to change and may not be available on all flights or dates of travel.

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 Monday or Wednesday and return on a Thursday

Cheap flight deals from Seattle to Sydney

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Seattle to Sydney

Cheapest flights from Seattle to SydneyExplore 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 4 July 2025.

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 4 July 2025.

Cheapflights Fare Finder

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

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.

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 return flight from Seattle to Sydney. Price data was last updated on 27 June 2025.

What is the cheapest month to book a flight from Seattle to Sydney?

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 4 July 2025.

How much does it cost for a return flight from Seattle to Sydney?

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 4 July 2025.

Get a feel of what it's like to fly with China Airlines, Alaska Airlines, andDelta from Seattle to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

What are the cheapest airlines to fly from Seattle to Sydney one-way?

Can I find deals for flights from Seattle to Sydney that include hotel bookings?

How can I find direct flights from Seattle to Sydney?

Can I find deals for business class flights from Seattle to Sydney?

What is the cheapest month to book a flight from Seattle to Sydney?

Travelling to a place near Seattle?

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.

Top 2 airlines flying from Seattle to Sydney

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Sydney?

Why should you use Cheapflights to find cheap flight tickets from Seattle to Sydney?

Can Cheapflights find flights from Seattle to Sydney with no change fees?

Can Cheapflights notify me if prices for flights from Seattle to Sydney become cheaper?

100% Free

Book with Flexibility

Travel Smart

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 4 July 2025.