Find flights
When to book
Airlines
FAQs

Cheap flights from Seattle to Australia from $573

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
10 Mar — 17 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Australia

Enter your travel dates to find the best prices.

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 8 February 2026.

Tue 25/823:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 1/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 6/2$1,123
Thu 17/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 30/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 4/2$1,124
Tue 10/320:00
SEA
-
BNE
1 stop18h 45m
Air Canada
Sun 10/510:00
BNE
-
SEA
1 stop25h 30m
Air Canada
Deal found 5/2$1,146
Thu 3/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 23/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 5/2$1,148
Thu 19/209:55
SEA
-
BNE
1 stop28h 50m
Air Canada
Wed 4/310:45
BNE
-
SEA
1 stop22h 16m
Air Canada
Deal found 5/2$1,154
Thu 19/215:40
SEA
-
BNE
1 stop23h 05m
Air Canada
Mon 23/210:45
BNE
-
SEA
1 stop30h 12m
Air Canada
Deal found 5/2$1,156
Thu 5/315:40
SEA
-
BNE
1 stop23h 05m
Air Canada
Thu 12/309:45
BNE
-
SEA
1 stop16h 50m
Air Canada
Deal found 5/2$1,164
Thu 24/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 29/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 5/2$1,177
Fri 4/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 23/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 5/2$1,190
Wed 29/415:40
SEA
-
BNE
1 stop22h 25m
Air Canada
Sun 10/510:00
BNE
-
SEA
1 stop21h 20m
Air Canada
Deal found 5/2$1,218
Fri 18/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 29/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 5/2$1,220
Mon 9/320:00
SEA
-
BNE
1 stop18h 45m
Air Canada
Mon 31/810:00
BNE
-
SEA
1 stop25h 32m
Air Canada
Deal found 6/2$1,227

Find flight deals from Seattle to Australia

Keep the following information in mind while searching for Seattle to Australia flight deals. Data was last updated 8 February 2026.

Round-trip from

$1,146

One-way from

$573

Popular in

December

Cheapest in

August

Average price

$1,282
Air Canada
  • Air Canada
  • 10/3-10/5
  • 2 total stops
  • 44h 15m total
  • Seattle to Australia
Search Deals
12/5
  • 12/5
  • 2 total stops
  • 42h 28m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($410 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($100 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Australia 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 647,157 searches. Data last updated 8 February 2026.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Seattle

Fly to

Australia

Route

Depart

Return

Price

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 9/3

15:40-07:45

1 stop23h 05m

Brisbane

Tue 1/9

20:40-09:17

2 stops29h 37m

$1,254

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 5/5

15:00-07:05

1 stop23h 05m

Brisbane

Mon 11/5

10:00-09:15

1 stop16h 15m

$1,277

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 13/5

19:20-07:05

1 stop18h 45m

Brisbane

Wed 3/6

10:00-14:20

1 stop21h 20m

$1,312

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 5/5

10:42-05:00

1 stop25h 18m

Brisbane

Sat 16/5

11:55-23:42

2 stops28h 47m

$1,312

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 16/4

10:42-05:00

1 stop25h 18m

Brisbane

Fri 8/5

11:35-16:17

2 stops45h 42m

$1,318

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 20/4

10:42-05:00

1 stop25h 18m

Brisbane

Fri 8/5

11:35-16:17

2 stops45h 42m

$1,318

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 20/4

10:42-05:00

1 stop25h 18m

Brisbane

Mon 4/5

11:55-09:29

2 stops38h 34m

$1,328

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 9/5

10:42-05:00

1 stop25h 18m

Brisbane

Thu 14/5

11:55-18:56

2 stops24h 01m

$1,346

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 20/2

05:50-08:45

1 stop32h 55m

Brisbane

Mon 23/2

12:05-09:15

2 stops39h 10m

$1,378

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Tue 7/4

11:45-22:40

1 stop43h 55m

Perth

Mon 27/4

00:10-10:05

1 stop24h 55m

$1,403

Flights are sorted by cheapest return flights first.

Deals found on 7/2

Showing 1-10 of 60 results
1
2
3
...
6

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, January is the cheapest month in which you can book a flight from Seattle to Australia (average of $633). Flying from Seattle to Australia in December is currently the most expensive (average of $1,204). 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.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated 8 February 2026.
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
9,253 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,253 reviews
United Airlines
7.4
Good
9,253 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Air Canada
7.1
Good
10,697 reviews
United Airlines
7.4
Good
9,253 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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?

    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?

    Air New Zealand, Air Canada, and Cathay Pacific can get you from Seattle to Australia in just under 18h 45m. Your travel time can differ by up to 25h 10m. There are 11822 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 Alaska Airlines, which is currently one of the cheapest options available, starting at $502. ANA flights start at $523 while deals on Qantas Airways start at $526 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 - Brisbane 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, January is the cheapest month in which you can book a flight from Seattle to Australia (average of $633). Flying from Seattle to Australia in December is currently the most expensive (average of $1,204). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 2 airlines flying from Seattle to Australia

Discover the top 2 airlines that operate flights from Seattle to Australia. 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 647,157 searches. Data last updated 8 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$616Average$1,683FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,138Average$1,972FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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?

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.