How long is the flight from Seattle to Australia?

Alaska Airlines, Air Canada, and United Airlines can get you from Seattle to Australia in just under 18h 45m. Your travel time can differ by up to 5h 15m. There are 12463 km between Seattle and Australia. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops. Find deals

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

To fly one-way, consider booking your trip with Qantas Airways, which is currently one of the cheapest options available, starting at $567. American Airlines flights start at $590 while deals on Air Canada start at $611 one-way. Find deals

In terms of precipitation, rainfall in Australia 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 Australia when rainfall is around 50.0 mm. Find deals

If weather is an important factor for your trip to Australia, 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 are the most popular routes from Seattle to Australia?

Most travellers choose Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Melbourne or Seattle/Tacoma Intl - Melbourne Avalon when deciding on the best route from Seattle to Australia.

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

To save on the cost of your flight from Seattle to Australia, book at least 48 days before your planned departure. Booking around this time can save you about 7% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $1,276 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,276.

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

September can be a great time to fly to Australia from Seattle with a flight ticket averaging about $1,640. Cheapflights users have found deals in the month of September for as cheap as $1,196. The most expensive prices can be found in the month of January.

What airport do you fly from for flights from Seattle to Australia?

Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Australia. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

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

Yes. In addition to deals on Seattle to Australia flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Seattle to Australia?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Australia.

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

Yes. Cheapflights offers flight deals from Seattle to Australia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$566+ Flights from Seattle to Australia

Cheap flight deals from Seattle to Australia

Round-trip from	$1,223
One-way from	$566
Popular in	January
Cheapest in	September
Average price	$1,412

Philippine Airlines
27/2-5/3
2 total stops
67h 25m total
Seattle to Australia

Search Deals

Qantas Airways
10/11
1 total stop
20h 30m total
Seattle to Australia

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($257 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($49 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from Seattle to Australia

Cheapest flights from Seattle to Australia
Explore the most affordable flight options available from Seattle to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.

Sat 20/915:40SEA - SYD

1 stop22h 15mAmerican Airlines

Wed 1/1012:10SYD - SEA

1 stop23h 59mAmerican Airlines

Deal found 14/9$1,226

Sun 21/915:40SEA - SYD

1 stop22h 15mAmerican Airlines

Tue 7/1010:10SYD - SEA

1 stop28h 15mAmerican Airlines

Deal found 14/9$1,228

Tue 21/1019:15SEA - SYD

1 stop19h 05mAir Canada

Sun 26/1010:20SYD - SEA

1 stop17h 11mAir Canada

Deal found 14/9$1,231

Wed 22/1007:40SEA - SYD

1 stop30h 25mAmerican Airlines

Wed 29/1011:20SYD - SEA

2 stops26h 07mAmerican Airlines

Deal found 15/9$1,234

Fri 7/1107:00SEA - SYD

1 stop17h 45mHawaiian Airlines

Sun 16/1121:40SYD - SEA

1 stop19h 17mHawaiian Airlines

Deal found 15/9$1,235

Mon 1/1218:41SEA - SYD

1 stop19h 19mAmerican Airlines

Sun 14/1217:45SYD - SEA

1 stop19h 35mAmerican Airlines

Deal found 15/9$1,243

Wed 5/1107:00SEA - SYD

1 stop17h 45mAlaska Airlines

Thu 13/1121:40SYD - SEA

1 stop17h 29mAlaska Airlines

Deal found 15/9$1,244

Tue 21/1019:15SEA - SYD

1 stop19h 05mAir Canada

Tue 4/1111:20SYD - SEA

1 stop22h 11mAir Canada

Deal found 14/9$1,246

Mon 20/1014:42SEA - SYD

1 stop23h 23mAmerican Airlines

Tue 4/1111:20SYD - SEA

2 stops21h 48mAmerican Airlines

Deal found 14/9$1,249

Mon 3/1114:55SEA - SYD

2 stops23h 05mAmerican Airlines

Mon 24/1117:45SYD - SEA

1 stop23h 39mAmerican Airlines

Deal found 14/9$1,250

Tue 28/1020:00SEA - MEL

2 stops29h 45mMultiple Airlines

Tue 4/1106:00MEL - SEA

2 stops22h 31mMultiple Airlines

Deal found 13/9$1,259

Thu 30/1020:00SEA - MEL

2 stops30h 15mMultiple Airlines

Sun 9/1108:10MEL - SEA

2 stops20h 21mMultiple Airlines

Deal found 13/9$1,261

Best flights from Seattle to Australia
Discover carefully curated flight deals from Seattle to Australia that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2025.

Thu 30/1007:00SEA - SYD

1 stop18h 45mAlaska Airlines

Thu 6/1121:40SYD - SEA

2 stops28h 31mAlaska Airlines

Deal found 15/9$1,244

Fri 5/1216:59SEA - SYD

1 stop19h 26mMultiple Airlines

Fri 12/1221:25SYD - SEA

1 stop18h 10mMultiple Airlines

Deal found 14/9$1,244

Tue 4/1112:45SEA - SYD

1 stop24h 45mDelta

Fri 14/1110:40SYD - SEA

1 stop18h 47mDelta

Deal found 15/9$1,268

Tue 30/913:00SEA - SYD

1 stop24h 55mUnited Airlines

Wed 15/1011:20SYD - SEA

1 stop18h 42mUnited Airlines

Deal found 15/9$1,268

Sat 28/220:00SEA - CNS

2 stops24h 00mAir Canada

Mon 16/306:00CNS - SEA

2 stops26h 01mAir Canada

Deal found 14/9$1,453

Wed 19/1114:59SEA - OOL

2 stops29h 06mQantas Airways

Wed 3/1210:25OOL - SEA

2 stops25h 03mQantas Airways

Deal found 14/9$1,550

Thu 23/1016:30SEA - PER

1 stop35h 10mQatar Airways

Tue 11/1122:45PER - SEA

1 stop28h 55mQatar Airways

Deal found 14/9$1,924

Sat 10/118:55SEA - ADL

2 stops42h 50mHawaiian Airlines

Wed 14/111:40ADL - SEA

2 stops27h 05mHawaiian Airlines

Deal found 15/9$2,266

Thu 26/207:20SEA - SYD

1 stop17h 25mAlaska Airlines

Thu 5/321:40SYD - SEA

2 stops19h 05mAlaska Airlines

Deal found 14/9$1,244

Tue 4/1114:10SEA - SYD

1 stop23h 20mDelta

Thu 13/1110:40SYD - SEA

1 stop25h 20mDelta

Deal found 15/9$1,268

Wed 25/207:20SEA - SYD

1 stop17h 25mAlaska Airlines

Sun 8/321:40SYD - SEA

2 stops27h 35mAlaska Airlines

Deal found 14/9$1,244

Tue 4/1109:46SEA - SYD

2 stops27h 44mDelta

Wed 12/1110:40SYD - SEA

2 stops21h 16mDelta

Deal found 15/9$1,274

Last-minute flights from Seattle to Australia
Discover last-minute flight deals from Seattle to Australia. Data last updated 16 September 2025 and is based on user searches.

Sat 20/915:40SEA - SYD

1 stop22h 15mAmerican Airlines

Wed 1/1012:10SYD - SEA

1 stop23h 59mAmerican Airlines

Deal found 14/9$1,226

Sun 21/915:40SEA - SYD

1 stop22h 15mAmerican Airlines

Tue 7/1010:10SYD - SEA

1 stop28h 15mAmerican Airlines

Deal found 14/9$1,228

Wed 1/1015:23SEA - SYD

1 stop23h 07mAmerican Airlines

Sat 11/1010:10SYD - SEA

1 stop22h 02mAmerican Airlines

Deal found 14/9$1,243

Mon 20/1007:44SEA - SYD

1 stop18h 01mAlaska Airlines

Sun 2/1121:40SYD - SEA

2 stops20h 56mAlaska Airlines

Deal found 15/9$1,244

Mon 20/1014:42SEA - SYD

1 stop23h 23mAmerican Airlines

Tue 4/1111:20SYD - SEA

2 stops21h 48mAmerican Airlines

Deal found 14/9$1,249

Tue 21/1019:15SEA - SYD

1 stop19h 05mAir Canada

Sun 26/1010:20SYD - SEA

1 stop17h 11mAir Canada

Deal found 14/9$1,231

Tue 21/1019:15SEA - SYD

1 stop19h 05mAir Canada

Tue 4/1111:20SYD - SEA

1 stop22h 11mAir Canada

Deal found 14/9$1,246

Tue 21/1014:55SEA - MEL

2 stops27h 15mMultiple Airlines

Sun 18/108:10MEL - SEA

2 stops20h 21mMultiple Airlines

Deal found 14/9$1,288

Wed 22/1007:40SEA - SYD

1 stop30h 25mAmerican Airlines

Wed 29/1011:20SYD - SEA

2 stops26h 07mAmerican Airlines

Deal found 15/9$1,234

Wed 22/1017:26SEA - SYD

1 stop20h 34mUnited Airlines

Wed 29/1011:50SYD - SEA

2 stops24h 20mUnited Airlines

Deal found 15/9$1,255

Tue 28/1020:00SEA - MEL

2 stops29h 45mMultiple Airlines

Tue 4/1106:00MEL - SEA

2 stops22h 31mMultiple Airlines

Deal found 13/9$1,259

Thu 30/1020:00SEA - MEL

2 stops30h 15mMultiple Airlines

Sun 9/1108:10MEL - SEA

2 stops20h 21mMultiple Airlines

Deal found 13/9$1,261

One-way flights from Seattle to Australia
Search for one-way flight options from Seattle to Australia. Find affordable one-way fares based on user searches. Data last updated 16 September 2025.

Mon 10/1117:30SEA - SYD

1 stop20h 30mQantas Airways

Deal found 13/9$566

Tue 11/1116:30SEA - SYD

1 stop19h 55mQantas Airways

Deal found 13/9$567

Thu 23/1014:42SEA - SYD

1 stop23h 23mQantas Airways

Deal found 13/9$572

Fri 24/1017:55SEA - SYD

1 stop20h 10mMultiple Airlines

Deal found 15/9$573

Wed 29/1022:30SEA - SYD

1 stop41h 20mPhilippine Airlines

Deal found 14/9$588

Fri 24/1015:29SEA - SYD

2 stops22h 36mAmerican Airlines

Deal found 13/9$590

Mon 22/916:59SEA - SYD

1 stop21h 06mMultiple Airlines

Deal found 15/9$594

Tue 11/1112:00SEA - SYD

2 stops26h 05mUnited Airlines

Deal found 13/9$596

Tue 11/1120:00SEA - MEL

2 stops22h 35mAir Canada

Deal found 14/9$599

Thu 29/112:25SEA - SYD

2 stops25h 40mUnited Airlines

Deal found 15/9$603

Fri 31/1020:00SEA - MEL

2 stops29h 45mMultiple Airlines

Deal found 14/9$606

Fri 31/1020:00SEA - AVV

2 stops25h 50mMultiple Airlines

Deal found 14/9$606

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 30/10

07:00-19:45

1 stop18h 45m

Sydney Kingsford Smith

Thu 6/11

21:40-07:11

2 stops28h 31m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 5/12

16:59-07:25

1 stop19h 26m

Sydney Kingsford Smith

Fri 12/12

21:25-20:35

1 stop18h 10m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 26/2

07:20-19:45

1 stop17h 25m

Sydney Kingsford Smith

Thu 5/3

21:40-21:45

2 stops19h 05m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 25/2

07:20-19:45

1 stop17h 25m

Sydney Kingsford Smith

Sun 8/3

21:40-07:15

2 stops27h 35m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 6/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Tue 11/11

21:40-07:11

2 stops28h 31m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 28/2

07:20-19:45

1 stop17h 25m

Sydney Kingsford Smith

Sun 8/3

21:40-22:40

1 stop19h 00m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/11

12:45-08:30

1 stop24h 45m

Sydney Kingsford Smith

Fri 14/11

10:40-10:27

1 stop18h 47m

$1,268

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 30/9

13:00-06:55

1 stop24h 55m

Sydney Kingsford Smith

Wed 15/10

11:20-12:02

1 stop18h 42m

$1,268

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/11

14:10-08:30

1 stop23h 20m

Sydney Kingsford Smith

Thu 13/11

10:40-17:00

1 stop25h 20m

$1,268

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 9/11

18:30-19:45

1 stop30h 15m

Sydney Kingsford Smith

Thu 13/11

21:40-07:11

2 stops28h 31m

$1,270

Flights are sorted by cheapest return flights first.

Deals found on 13/9

Showing 1-10 of 60 results

...

Best time to book a flight from Seattle to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia 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 Australia

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

Currently, May is the cheapest month in which you can book a flight from Seattle to Australia (average of $129). Flying from Seattle to Australia 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 AU?

When flying from Seattle to Australia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Australia

Read reviews from past customers who have flown with United Airlines and Air Canada from Seattle to Australia. 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.

United Airlines

7.4

Good

8,929 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

8,929 reviews

United Airlines

7.4

Good

8,929 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Air Canada

7.1

Good

10,000 reviews

United Airlines

7.4

Good

8,929 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

What airport do you fly from for flights from Seattle to Australia?
Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Australia. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.
How long is the flight from Seattle to Australia?
Alaska Airlines, Air Canada, and United Airlines can get you from Seattle to Australia in just under 18h 45m. Your travel time can differ by up to 5h 15m. There are 12463 km between Seattle and Australia. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines to fly from Seattle to Australia one-way?
To fly one-way, consider booking your trip with Qantas Airways, which is currently one of the cheapest options available, starting at $567. American Airlines flights start at $590 while deals on Air Canada start at $611 one-way.
What are the most popular routes from Seattle to Australia?
Most travellers choose Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Melbourne or Seattle/Tacoma Intl - Melbourne Avalon when deciding on the best route from Seattle to Australia.
Can I find deals for flights from Seattle to Australia that include hotel bookings?
Yes. In addition to deals on Seattle to Australia flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Seattle to Australia?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Australia.
Can I find deals for business class flights from Seattle to Australia?
Yes. Cheapflights offers flight deals from Seattle to Australia 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 Australia?
Currently, May is the cheapest month in which you can book a flight from Seattle to Australia (average of $129). Flying from Seattle to Australia 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

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from Seattle to Australia

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$1,199	Average$1,880	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	Cheapest$1,261	Average$1,778	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Australia. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Australia.

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

Certainly. Search results for flights to Australia from Seattle shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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 Australia from $566

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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Seattle to Australia

Keep the following information in mind while searching for Seattle to Australia flight deals. Data was last updated 16 September 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Seattle to Australia

Cheapest flights from Seattle to AustraliaExplore the most affordable flight options available from Seattle to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.

Explore the most affordable flight options available from Seattle to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Seattle to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Seattle with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Australia

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

What is the cheapest time of day to fly from SEA to AU?

Find hourly flight availability from Seattle to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 16 September 2025.

Reviews of airlines servicing Australia

Read reviews from past customers who have flown with United Airlines and Air Canada from Seattle to Australia. 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.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Seattle to Australia?

How long is the flight from Seattle to Australia?

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

What are the most popular routes from Seattle to Australia?

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

How can I find direct flights from Seattle to Australia?

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

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

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 Australia

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Seattle to Australia

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 Australia?

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

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

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

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Seattle to Australia
Explore the most affordable flight options available from Seattle to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.