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

Flying on Air Canada is currently your cheapest option to Sydney, with prices starting at $1,193. Additional round-trip tickets that might be worth considering are offered by Qantas Airways and American Airlines, with the lowest prices starting at $1,217 and $1,282, respectively. Users have found that Air Canada is 31% 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 Qantas Airways ($616), Air Canada ($636), and American Airlines ($657). 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.

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 $1,351 1-2 weeks out and tickets from $1,712 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 $1,288.

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.

$602+ 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	$1,193
One-way from	$602
Popular in	December
Cheapest in	March
Average price	$1,672

Air Canada
7/9-16/9
2 total stops
44h 11m total
Seattle to Sydney

Search Deals

9/9
2 total stops
37h 40m total
Seattle to Sydney

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($328 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($76 potential savings vs. average return price).

Search Deals

Average for round-trip flights in June 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 13 June 2025.

Sun 7/914:55SEA - SYD

1 stop23h 25mAir Canada

Tue 16/909:20SYD - SEA

1 stop20h 46mAir Canada

Deal found 11/6$1,193

Wed 27/814:32SEA - SYD

1 stop23h 58mQantas Airways

Tue 16/909:10SYD - SEA

1 stop20h 40mQantas Airways

Deal found 12/6$1,217

Mon 4/818:09SEA - SYD

1 stop20h 21mMultiple Airlines

Sun 17/809:10SYD - SEA

1 stop18h 39mMultiple Airlines

Deal found 12/6$1,260

Sat 2/814:30SEA - SYD

1 stop24h 00mAmerican Airlines

Sun 24/817:45SYD - SEA

1 stop20h 48mAmerican Airlines

Deal found 12/6$1,282

Fri 1/805:10SEA - SYD

1 stop32h 45mUnited Airlines

Mon 11/809:30SYD - SEA

2 stops28h 27mUnited Airlines

Deal found 12/6$1,294

Sun 3/814:24SEA - SYD

1 stop23h 11mDelta

Sat 16/809:25SYD - SEA

1 stop20h 09mDelta

Deal found 11/6$1,305

Wed 27/810:00SEA - SYD

2 stops30h 25mANA

Tue 16/911:50SYD - SEA

2 stops23h 46mANA

Deal found 12/6$1,375

Thu 4/1217:40SEA - SYD

1 stop20h 20mAlaska Airlines

Mon 2/311:15SYD - SEA

1 stop20h 41mAlaska Airlines

Deal found 10/6$1,400

Wed 8/1023:35SEA - SYD

1 stop39h 25mPhilippine Airlines

Sun 12/1011:10SYD - SEA

1 stop26h 05mPhilippine Airlines

Deal found 11/6$1,515

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 13 June 2025.

Sun 7/914:55SEA - SYD

1 stop23h 25mAir Canada

Tue 16/909:20SYD - SEA

1 stop20h 46mAir Canada

Deal found 11/6$1,193

Thu 14/817:55SEA - SYD

1 stop20h 10mQantas Airways

Tue 9/909:10SYD - SEA

1 stop28h 14mQantas Airways

Deal found 13/6$1,217

Mon 4/818:09SEA - SYD

1 stop20h 21mMultiple Airlines

Sun 17/809:10SYD - SEA

1 stop18h 39mMultiple Airlines

Deal found 12/6$1,260

Sat 2/814:30SEA - SYD

1 stop24h 00mAmerican Airlines

Sun 24/817:45SYD - SEA

1 stop20h 48mAmerican Airlines

Deal found 12/6$1,282

Fri 1/805:10SEA - SYD

1 stop32h 45mUnited Airlines

Mon 11/810:20SYD - SEA

1 stop17h 28mUnited Airlines

Deal found 12/6$1,294

Sun 3/814:24SEA - SYD

1 stop23h 11mDelta

Sat 16/809:25SYD - SEA

1 stop20h 09mDelta

Deal found 11/6$1,305

Wed 27/810:00SEA - SYD

2 stops30h 25mANA

Tue 16/911:50SYD - SEA

2 stops23h 46mANA

Deal found 12/6$1,375

Thu 4/1217:40SEA - SYD

1 stop20h 20mAlaska Airlines

Mon 2/311:15SYD - SEA

1 stop20h 41mAlaska Airlines

Deal found 10/6$1,400

Wed 8/1023:35SEA - SYD

1 stop39h 25mPhilippine Airlines

Sun 12/1011:10SYD - SEA

1 stop26h 05mPhilippine Airlines

Deal found 11/6$1,515

Sat 26/708:15SEA - SYD

1 stop18h 30mHawaiian Airlines

Sat 2/821:40SYD - SEA

1 stop28h 00mHawaiian Airlines

Deal found 13/6$1,805

Last-minute flights from Seattle to Sydney
Discover last-minute flight deals from Seattle to Sydney. Data last updated 13 June 2025 and is based on user searches.

Fri 13/617:14SEA - SYD

1 stop20h 46mUnited Airlines

Sun 15/609:30SYD - SEA

2 stops28h 38mUnited Airlines

Deal found 10/6$1,494

Sun 15/614:40SEA - SYD

1 stop23h 25mQantas Airways

Tue 17/621:30SYD - SEA

1 stop17h 30mQantas Airways

Deal found 11/6$1,250

Wed 18/608:00SEA - SYD

1 stop30h 05mAmerican Airlines

Thu 10/717:45SYD - SEA

1 stop20h 56mAmerican Airlines

Deal found 12/6$1,317

Wed 18/605:30SEA - SYD

2 stops32h 05mDelta

Thu 10/709:25SYD - SEA

2 stops31h 34mDelta

Deal found 12/6$1,359

Wed 18/623:35SEA - SYD

1 stop39h 25mPhilippine Airlines

Sun 29/610:10SYD - SEA

1 stop26h 05mPhilippine Airlines

Deal found 12/6$8,101

Thu 19/617:14SEA - SYD

1 stop20h 46mUnited Airlines

Thu 26/610:20SYD - SEA

1 stop17h 28mUnited Airlines

Deal found 13/6$1,504

Thu 19/601:10SEA - SYD

1 stop40h 35mChina Airlines

Sun 29/622:10SYD - SEA

1 stop38h 20mChina Airlines

Deal found 11/6$3,279

Thu 19/621:07SEA - SYD

3 stops51h 43mAir Tahiti Nui

Thu 26/608:55SYD - SEA

3 stops29h 39mAir Tahiti Nui

Deal found 13/6$3,650

Thu 19/614:40SEA - SYD

2 stops28h 15mQantas Airways

Wed 25/619:25SYD - SEA

3 stops41h 35mQantas Airways

Deal found 12/6$6,739

Thu 19/600:05SEA - SYD

2 stops41h 45mCathay Pacific

Sun 29/610:10SYD - SEA

2 stops49h 55mCathay Pacific

Deal found 12/6$16,346

Fri 20/614:40SEA - SYD

1 stop23h 25mMultiple Airlines

Sun 29/610:10SYD - SEA

1 stop26h 05mMultiple Airlines

Deal found 12/6$1,937

Fri 20/610:22SEA - SYD

1 stop40h 23mAlaska Airlines

Sun 29/621:40SYD - SEA

1 stop25h 20mAlaska Airlines

Deal found 11/6$2,177

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 13 June 2025.

Tue 9/908:00SEA - SYD

2 stops37h 40mMultiple Airlines

Deal found 12/6$602

Wed 6/814:32SEA - SYD

1 stop23h 33mQantas Airways

Deal found 12/6$616

Sun 21/919:15SEA - SYD

2 stops23h 25mAir Canada

Deal found 11/6$636

Sun 3/814:30SEA - SYD

1 stop24h 00mAmerican Airlines

Deal found 12/6$657

Tue 5/817:14SEA - SYD

1 stop20h 46mUnited Airlines

Deal found 12/6$662

Fri 1/820:10SEA - SYD

1 stop41h 25mDelta

Deal found 12/6$671

Wed 9/715:44SEA - SYD

2 stops22h 21mAlaska Airlines

Deal found 11/6$794

Sat 26/710:00SEA - SYD

2 stops40h 15mANA

Deal found 11/6$795

Mon 3/1100:10SEA - SYD

1 stop37h 20mAsiana Airlines

Deal found 13/6$1,368

Mon 1/901:40SEA - SYD

1 stop40h 05mChina Airlines

Deal found 12/6$1,414

Mon 4/818:25SEA - SYD

3 stops48h 20mFiji Airways

Deal found 12/6$1,440

Tue 4/1111:25SEA - SYD

3 stops35h 15mAir Tahiti Nui

Deal found 12/6$1,736

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

Sun 7/9

14:55-07:20

1 stop23h 25m

Sydney Kingsford Smith

Tue 16/9

09:20-13:06

1 stop20h 46m

$1,193

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 14/8

17:55-07:05

1 stop20h 10m

Sydney Kingsford Smith

Tue 9/9

09:10-20:24

1 stop28h 14m

$1,217

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/8

18:09-07:30

1 stop20h 21m

Sydney Kingsford Smith

Sun 17/8

09:10-10:49

1 stop18h 39m

$1,260

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/8

14:30-07:30

1 stop24h 00m

Sydney Kingsford Smith

Sun 24/8

17:45-21:33

1 stop20h 48m

$1,282

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 1/8

05:10-06:55

1 stop32h 45m

Sydney Kingsford Smith

Mon 11/8

10:20-10:48

1 stop17h 28m

$1,294

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 3/8

14:24-06:35

1 stop23h 11m

Sydney Kingsford Smith

Sat 16/8

09:25-12:34

1 stop20h 09m

$1,305

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 27/8

10:00-09:25

2 stops30h 25m

Sydney Kingsford Smith

Tue 16/9

11:50-18:36

2 stops23h 46m

$1,375

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/7

10:40-07:05

2 stops27h 25m

Sydney Kingsford Smith

Thu 24/7

09:10-14:25

2 stops22h 15m

$1,408

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 26/7

08:15-19:45

1 stop18h 30m

Sydney Kingsford Smith

Sat 2/8

21:40-08:40

1 stop28h 00m

$1,805

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 9/9

08:00-14:40

2 stops37h 40m

$602

Flights are sorted by cheapest return flights first.

Deals found on 12/6

Showing 1-10 of 22 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.

Rainfall in Sydney by month

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.

Temperature in Sydney 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 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).

Reviews of airlines servicing Sydney

To help decide which airline to fly from Seattle to Sydney, see what other customers have to say about Air Tahiti Nui, China Airlines and ANA. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Air Tahiti Nui

8.7

Very Good

64 reviews

Check prices

Reviews

1 / 2

10.0

Excellent

Isabelle,Apr 2023

AKL - PPT

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

8.7

Very Good

64 reviews

Air Tahiti Nui

8.7

Very Good

64 reviews

Check prices

Reviews

1 / 2

10.0

Excellent

Isabelle,Apr 2023

AKL - PPT

China Airlines

8.3

Very Good

738 reviews

Air Tahiti Nui

8.7

Very Good

64 reviews

Check prices

Reviews

1 / 2

10.0

Excellent

Isabelle,Apr 2023

AKL - PPT

ANA

8.3

Very Good

882 reviews

Air Tahiti Nui

8.7

Very Good

64 reviews

Check prices

Reviews

1 / 2

10.0

Excellent

Isabelle,Apr 2023

AKL - PPT

Asiana Airlines

8.2

Very Good

440 reviews

Air Tahiti Nui

8.7

Very Good

64 reviews

Check prices

Reviews

1 / 2

10.0

Excellent

Isabelle,Apr 2023

AKL - PPT

Fiji Airways

8.1

Very Good

194 reviews

Air Tahiti Nui

8.7

Very Good

64 reviews

Check prices

Reviews

1 / 2

10.0

Excellent

Isabelle,Apr 2023

AKL - PPT

Related info for your journey

What are the cheapest airlines flying from Seattle to Sydney round-trip?
Flying on Air Canada is currently your cheapest option to Sydney, with prices starting at $1,193. Additional round-trip tickets that might be worth considering are offered by Qantas Airways and American Airlines, with the lowest prices starting at $1,217 and $1,282, respectively. Users have found that Air Canada is 31% 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 Qantas Airways ($616), Air Canada ($636), and American Airlines ($657).
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

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Katoomba

Manly

Penrith

Coogee

Randwick

Cronulla

Terrigal

Lithgow

Bondi Beach

Leura

Swansea

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Alternative routes for Seattle to Sydney

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Portland to Coolangatta flights

Other flights to Sydney

Top 2 airlines flying from Seattle to Sydney

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$1,158	Average$1,733	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	Cheapest$1,290	Average$1,627	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

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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.

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Cheap flights from Seattle to Sydney from $602

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.

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 13 June 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 13 June 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 9 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 13 June 2025.

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

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 13 June 2025.

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?

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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 13 June 2025.