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Cheap flights from Seattle to Australia from $551

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
1 Apr — 8 Apr1
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 2 March 2026.

Thu 10/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 6/1011:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/3$987
Mon 1/616:30
SEA
-
SYD
1 stop33h 45m
ANA
Sun 14/620:55
SYD
-
SEA
1 stop34h 30m
ANA
Deal found 26/2$1,026
Wed 2/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 15/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 1/3$1,110
Sun 1/1119:05
SEA
-
BNE
1 stop19h 40m
Air Canada
Sun 8/1110:45
BNE
-
SEA
1 stop21h 46m
Air Canada
Deal found 27/2$1,113
Tue 10/310:10
SEA
-
BNE
1 stop28h 35m
Air Canada
Sun 10/510:00
BNE
-
SEA
1 stop25h 30m
Air Canada
Deal found 27/2$1,116
Sun 1/1115:05
SEA
-
BNE
1 stop23h 40m
Air Canada
Fri 20/1110:45
BNE
-
SEA
1 stop21h 46m
Air Canada
Deal found 28/2$1,124
Sun 1/1115:05
SEA
-
BNE
1 stop23h 40m
Multiple Airlines
Sun 22/1110:45
BNE
-
SEA
1 stop17h 06m
Multiple Airlines
Deal found 28/2$1,130
Sun 1/1119:05
SEA
-
BNE
1 stop19h 40m
Asiana Airlines
Fri 20/1110:45
BNE
-
SEA
1 stop17h 06m
Asiana Airlines
Deal found 28/2$1,138
Wed 4/1115:05
SEA
-
BNE
1 stop23h 40m
Multiple Airlines
Fri 20/1110:45
BNE
-
SEA
1 stop17h 06m
Multiple Airlines
Deal found 28/2$1,141
Fri 18/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 30/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 26/2$1,148
Fri 11/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 6/1011:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 1/3$1,150
Sun 1/1119:05
SEA
-
BNE
1 stop19h 40m
Multiple Airlines
Sun 8/1106:10
BNE
-
SEA
2 stops21h 41m
Multiple Airlines
Deal found 27/2$1,153

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 2 March 2026.

Round-trip from

$1,026

One-way from

$552

Popular in

December

Cheapest in

August

Average price

$1,404
ANA
  • ANA
  • 1/6-14/6
  • 2 total stops
  • 68h 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 ($404 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 March 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 2 March 2026.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 31/5

18:48-06:55

1 stop19h 07m

Sydney Kingsford Smith

Mon 29/6

10:20-14:30

1 stop21h 10m

$1,257

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 15/4

15:40-11:50

2 stops27h 40m

Adelaide

Wed 22/4

17:15-09:38

2 stops32h 53m

$1,314

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 18/4

17:45-06:55

1 stop20h 10m

Sydney Kingsford Smith

Mon 11/5

09:30-21:06

2 stops28h 36m

$1,330

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 30/4

16:36-06:50

2 stops21h 14m

Sydney Kingsford Smith

Tue 19/5

09:15-22:03

2 stops29h 48m

$1,332

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 30/4

16:36-06:50

2 stops21h 14m

Sydney Kingsford Smith

Sun 17/5

09:15-16:44

2 stops24h 29m

$1,332

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 24/7

18:55-06:50

1 stop18h 55m

Sydney Kingsford Smith

Fri 7/8

09:15-20:28

1 stop28h 13m

$1,391

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 1/8

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

Fri 14/8

09:15-18:29

2 stops26h 14m

$1,397

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 21/4

17:45-08:15

1 stop21h 30m

Melbourne

Fri 1/5

09:30-21:06

2 stops28h 36m

$1,477

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 1/5

13:21-08:15

1 stop25h 54m

Melbourne

Fri 15/5

09:30-21:06

2 stops28h 36m

$1,477

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 31/3

10:48-09:15

2 stops28h 27m

Melbourne

Thu 9/4

10:55-00:34

2 stops30h 39m

$1,484

Flights are sorted by cheapest return flights first.

Deals found on 1/3

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $599). Flying from Seattle to Australia in December is currently the most expensive (average of $1,188). 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 2 March 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
9,375 reviews
Check prices

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

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
9,375 reviews
United Airlines
7.4
Good
9,375 reviews
Check prices

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

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
10,764 reviews
United Airlines
7.4
Good
9,375 reviews
Check prices

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

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?

    ANA, American Airlines, and Cathay Pacific can get you from Seattle to Australia in just under 23h 25m. Your travel time can differ by up to 19h 50m. 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 ANA, which is currently one of the cheapest options available, starting at $516. Qantas Airways flights start at $519 while deals on United Airlines start at $564 one-way.

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

    Most travellers choose Seattle/Tacoma Intl - Brisbane, Seattle/Tacoma Intl - Sydney Kingsford Smith or Seattle/Tacoma Intl - Melbourne 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 $599). Flying from Seattle to Australia in December is currently the most expensive (average of $1,188). 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 2 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$607Average$1,657FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,123Average$2,025FlexibilityNo 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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