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Cheap flights from Seattle to Australia from $733

SEA — SYD
22 Sep — 29 Sep1
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

Sun 30/815:00 -
1 stop23h 20m
Tue 15/909:20 -
1 stop17h 45m
Deal found 19/8$1,252
Sun 30/819:20 -
2 stops22h 20m
Tue 15/909:20 -
1 stop26h 12m
Deal found 19/8$1,271
Sun 20/919:15 -
1 stop19h 05m
Sun 4/1010:20 -
1 stop26h 12m
Deal found 19/8$1,306
Sun 20/919:15 -
2 stops23h 10m
Sun 4/1010:20 -
1 stop22h 02m
Deal found 19/8$1,320
Mon 21/910:50 -
1 stop27h 15m
Sat 26/910:15 -
1 stop25h 17m
Deal found 19/8$1,350
Mon 2/1108:40 -
1 stop30h 05m
Mon 9/1110:45 -
1 stop21h 52m
Deal found 18/8$1,383
Mon 21/910:50 -
1 stop27h 15m
Sat 26/920:45 -
2 stops30h 20m
Deal found 19/8$1,407
Mon 2/1119:05 -
2 stops24h 20m
Mon 9/1110:45 -
1 stop21h 52m
Deal found 18/8$1,411
Sat 29/815:58 -
1 stop21h 47m
Tue 15/909:45 -
1 stop20h 54m
Deal found 18/8$1,419
Sat 12/910:50 -
1 stop27h 15m
Mon 28/910:00 -
1 stop25h 32m
Deal found 19/8$1,422
Fri 21/817:02 -
1 stop20h 43m
Fri 28/809:45 -
1 stop24h 07m
Deal found 20/8$1,426
Fri 21/809:59 -
1 stop28h 51m
Fri 28/810:00 -
1 stop21h 50m
Deal found 21/8$1,451

Find flight deals from Seattle to Australia

Round-trip from

$1,288

One-way from

$733

Popular in

December

Cheapest in

August

Average price

$1,121
Air Canada
  • Air Canada
  • 9/2-24/2
  • 2 total stops
  • 45h 17m total
  • Seattle to Australia
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ANA
  • ANA
  • 26/8
  • 1 total stop
  • 23h 55m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($441 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($104 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
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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

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 23/9

15:00-07:20

1 stop23h 20m

Sydney Kingsford Smith

Sun 4/10

10:20-14:22

1 stop22h 02m

$1,419

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Fri 28/8

09:05-08:15

1 stop30h 10m

Melbourne

Tue 15/9

06:00-16:14

2 stops27h 14m

$1,472

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Sat 29/8

07:00-08:15

2 stops32h 15m

Melbourne

Tue 15/9

06:00-11:21

2 stops22h 21m

$1,478

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Sun 20/9

21:35-07:50

1 stop41h 15m

Melbourne

Tue 13/10

11:00-14:50

1 stop21h 50m

$1,525

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 23/9

13:24-06:50

2 stops24h 26m

Sydney Kingsford Smith

Sun 4/10

10:15-18:36

2 stops26h 21m

$1,527

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Tue 13/10

12:00-09:15

2 stops27h 15m

Melbourne

Tue 20/10

11:55-14:17

1 stop20h 22m

$1,548

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Fri 23/10

09:42-07:10

2 stops27h 28m

Melbourne

Sat 31/10

09:10-22:05

2 stops30h 55m

$1,584

SeattleCoolangatta

SEA Seattle/Tacoma Intl - OOL Coolangatta Gold Coast

SEAOOL

Seattle/Tacoma Intl

Tue 3/11

13:35-14:05

2 stops30h 30m

Coolangatta Gold Coast

Wed 11/11

06:00-13:00

2 stops25h 00m

$1,592

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Wed 25/11

07:00-07:30

2 stops30h 30m

Brisbane

Wed 9/12

06:05-11:33

2 stops23h 28m

$1,595

SeattleCoolangatta

SEA Seattle/Tacoma Intl - OOL Coolangatta Gold Coast

SEAOOL

Seattle/Tacoma Intl

Wed 28/10

19:05-17:20

2 stops29h 15m

Coolangatta Gold Coast

Sun 1/11

06:00-15:37

2 stops26h 37m

$1,626

Flights are sorted by cheapest return flights first.

Deals found on 20/8

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 $1,352). Flying from Seattle to Australia in December is currently the most expensive (average of $2,353). 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 90 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
7.4
Good
10,112 reviews
Check prices

Entertainment

7.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
United Airlines
7.4
Good
10,112 reviews
United Airlines
7.4
Good
10,112 reviews
Check prices

Entertainment

7.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

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, United Airlines, and Delta can get you from Seattle to Australia in just under 23h 20m. Your travel time can differ by up to 17h 55m. 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 United Airlines, which is currently one of the cheapest options available, starting at $559. Air Canada flights start at $599 while deals on Qantas Airways start at $635 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 $1,352). Flying from Seattle to Australia in December is currently the most expensive (average of $2,353). 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$1,410Average$1,524FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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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.

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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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