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Cheap flights from Seattle to Australia from $712

SEA — SYD
30 Nov — 7 Dec1
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

Fri 6/1108:40 -
1 stop30h 05m
Sun 15/1110:45 -
1 stop25h 37m
Deal found 26/10$1,442
Wed 28/1010:10 -
1 stop28h 25m
Thu 19/1111:20 -
1 stop17h 12m
Deal found 26/10$1,480
Sat 7/1110:10 -
1 stop28h 35m
Wed 11/1110:45 -
1 stop16h 42m
Deal found 27/10$1,489
Thu 29/1022:30 -
1 stop41h 20m
Thu 5/1111:30 -
1 stop26h 15m
Deal found 28/10$1,496
Thu 5/1112:00 -
1 stop23h 25m
Thu 12/1121:40 -
2 stops21h 19m
Deal found 28/10$1,506
Mon 9/1121:30 -
1 stop41h 20m
Wed 18/1111:30 -
1 stop26h 15m
Deal found 30/10$1,509
Sat 7/1119:05 -
1 stop19h 40m
Wed 11/1106:10 -
2 stops21h 17m
Deal found 27/10$1,517
Thu 29/1022:30 -
1 stop41h 20m
Wed 11/1111:30 -
1 stop26h 15m
Deal found 28/10$1,523
Sat 21/1115:15 -
1 stop23h 20m
Sun 29/1111:20 -
1 stop29h 37m
Deal found 26/10$1,524
Mon 9/1110:10 -
1 stop28h 25m
Wed 18/1108:30 -
2 stops32h 27m
Deal found 29/10$1,529
Mon 9/1108:40 -
1 stop29h 55m
Tue 17/1109:00 -
2 stops19h 32m
Deal found 30/10$1,530
Mon 9/1119:05 -
1 stop19h 40m
Thu 12/1110:45 -
1 stop16h 47m
Deal found 26/10$1,542

Find flight deals from Seattle to Australia

Round-trip from

$1,391

One-way from

$712

Popular in

December

Cheapest in

August

Average price

$1,530
Air Canada
  • Air Canada
  • 9/2-28/2
  • 2 total stops
  • 40h 32m total
  • Seattle to Australia
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 10/3-31/12
  • 1 total stop
  • 41h 20m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($523 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($138 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
Search Deals

Cheapflights Fare Finder

 
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

Cheapest return flight

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Tue 16/2

08:40-06:15

2 stops29h 35m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$739
Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 18/11

15:59-06:25

1 stop19h 26m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$752

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Sat 27/2

08:40-08:25

1 stop31h 45m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$765

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 29/11

08:40-18:50

1 stop39h 10m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$772

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 30/3

12:00-06:30

1 stop24h 30m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$784

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Wed 3/3

08:40-04:45

2 stops52h 05m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$798

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Mon 9/11

21:30-07:20

1 stop41h 50m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$815

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Wed 24/2

21:30-07:20

1 stop41h 50m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$843

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Fri 5/2

08:40-05:40

2 stops50h 00m

Melbourne

Wed 31/12

00:00-06:00

Nonstop0h 00m

$845

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Sat 5/12

07:10-05:50

1 stop28h 40m

Brisbane

Wed 31/12

00:00-06:00

Nonstop0h 00m

$853

Flights are sorted by cheapest return flights first.

Deals found on 27/10

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

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, February is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,512). Flying from Seattle to Australia in December is currently the most expensive (average of $2,433). 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.

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

Booking 89 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Australia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Australia

Read reviews from past customers who have flown with United Airlines 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
7.3
Good
10,451 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.3

Entertainment

7.1

Food

6.7

Reviews

1 / 20
8.0
Excellent

Asha,Sept 2026

LGA - IAH

The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.
United Airlines
7.3
Good
10,451 reviews
United Airlines
7.3
Good
10,451 reviews
Check prices

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.3

Entertainment

7.1

Food

6.7

Reviews

1 / 20
8.0
Excellent

Asha,Sept 2026

LGA - IAH

The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.

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?

    Air Canada, Alaska Airlines, and Delta can get you from Seattle to Australia in just under 19h 20m. Your travel time can differ by up to 6h 40m. 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 Air Canada, which is currently one of the cheapest options available, starting at $611. United Airlines flights start at $632 while deals on Qantas Airways start at $647 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, February is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,512). Flying from Seattle to Australia in December is currently the most expensive (average of $2,433). 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 airline flying from Seattle to Australia

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,438Average$1,554FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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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.

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