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Cheap flights from Seattle to Australia from $529

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 28/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
21 Mar — 28 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 19 February 2026.

Thu 19/215:40
SEA
-
BNE
1 stop23h 05m
Air Canada
Wed 4/310:45
BNE
-
SEA
1 stop22h 16m
Air Canada
Deal found 17/2$1,064
Tue 10/320:00
SEA
-
BNE
1 stop18h 45m
Air Canada
Sun 10/510:00
BNE
-
SEA
1 stop16h 15m
Air Canada
Deal found 19/2$1,066
Wed 2/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 15/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 19/2$1,108
Sun 8/320:00
SEA
-
BNE
2 stops32h 50m
Multiple Airlines
Fri 13/309:45
BNE
-
SEA
1 stop16h 50m
Multiple Airlines
Deal found 17/2$1,110
Sat 28/210:05
SEA
-
BNE
1 stop28h 40m
Air Canada
Sat 7/310:45
BNE
-
SEA
1 stop16h 46m
Air Canada
Deal found 16/2$1,112
Thu 19/320:00
SEA
-
BNE
2 stops42h 30m
Multiple Airlines
Wed 29/410:00
BNE
-
SEA
1 stop26h 20m
Multiple Airlines
Deal found 16/2$1,118
Mon 2/1110:35
SEA
-
BNE
1 stop28h 10m
Air Canada
Tue 1/1210:45
BNE
-
SEA
1 stop17h 06m
Air Canada
Deal found 18/2$1,138
Sun 1/1115:05
SEA
-
BNE
1 stop23h 40m
Air New Zealand
Wed 2/1210:45
BNE
-
SEA
1 stop17h 06m
Air New Zealand
Deal found 18/2$1,156
Tue 10/310:10
SEA
-
BNE
1 stop28h 35m
Multiple Airlines
Sun 10/520:40
BNE
-
SEA
2 stops29h 35m
Multiple Airlines
Deal found 16/2$1,161
Thu 3/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 15/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 18/2$1,173
Tue 21/420:00
SEA
-
MEL
2 stops22h 20m
Multiple Airlines
Thu 30/406:00
MEL
-
SEA
2 stops20h 35m
Multiple Airlines
Deal found 19/2$1,283
Mon 1/607:00
SEA
-
SYD
1 stop30h 55m
United Airlines
Mon 29/610:20
SYD
-
SEA
1 stop24h 47m
United Airlines
Deal found 19/2$1,283

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 19 February 2026.

Round-trip from

$1,064

One-way from

$529

Popular in

December

Cheapest in

August

Average price

$1,202
Air Canada
  • Air Canada
  • 3/3-6/3
  • 2 total stops
  • 45h 21m total
  • Seattle to Australia
Search Deals
Air Canada
  • Air Canada
  • 28/2
  • 1 total stop
  • 18h 45m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($412 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($102 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 19 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

Thu 5/3

20:00-08:45

1 stop18h 45m

Brisbane

Sun 8/3

10:45-21:57

1 stop29h 12m

$1,064

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 10/3

10:10-07:45

1 stop28h 35m

Brisbane

Sun 10/5

20:40-09:15

2 stops29h 35m

$1,161

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 5/3

20:00-08:45

1 stop18h 45m

Brisbane

Sun 8/3

22:55-09:35

2 stops27h 40m

$1,206

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 28/4

15:40-07:05

1 stop22h 25m

Brisbane

Sun 10/5

10:00-18:30

1 stop25h 30m

$1,213

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 31/3

20:00-11:05

2 stops22h 05m

Brisbane

Tue 7/4

20:40-09:35

2 stops29h 55m

$1,233

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 29/3

09:40-07:50

1 stop28h 10m

Sydney Kingsford Smith

Sun 19/4

09:15-18:26

1 stop26h 11m

$1,295

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/4

09:40-06:50

1 stop28h 10m

Sydney Kingsford Smith

Mon 20/4

09:15-18:26

1 stop26h 11m

$1,295

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/4

13:30-06:50

1 stop24h 20m

Sydney Kingsford Smith

Sun 19/4

09:15-23:59

2 stops31h 44m

$1,301

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/4

11:10-06:50

2 stops26h 40m

Sydney Kingsford Smith

Mon 11/5

09:15-10:38

1 stop18h 23m

$1,301

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/4

17:55-06:50

1 stop19h 55m

Sydney Kingsford Smith

Sun 19/4

09:15-23:59

2 stops31h 44m

$1,301

Flights are sorted by cheapest return flights first.

Deals found on 16/2

Showing 1-10 of 60 results
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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 $604). Flying from Seattle to Australia in December is currently the most expensive (average of $1,197). 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 19 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
9,325 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
9,325 reviews
United Airlines
7.4
Good
9,325 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
10,732 reviews
United Airlines
7.4
Good
9,325 reviews
Check prices

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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 Canada, Delta, and Cathay Pacific can get you from Seattle to Australia in just under 18h 45m. Your travel time can differ by up to 24h 30m. 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 $500. ANA flights start at $520 while deals on Qantas Airways start at $523 one-way.

  • What are the most popular routes from Seattle to Australia?

    Most travellers choose Seattle/Tacoma Intl - Melbourne, Seattle/Tacoma Intl - Sydney Kingsford Smith 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 $604). Flying from Seattle to Australia in December is currently the most expensive (average of $1,197). 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 19 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$612Average$1,674FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,132Average$1,989FlexibilityNo 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!

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