Find flights
When to book
Airlines
FAQs

Cheap flights from Seattle to Australia from $701

SEA — SYD
31 Oct — 7 Nov1
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 8/1110:10 -
1 stop28h 25m
Sun 22/1108:30 -
2 stops19h 57m
Deal found 1/10$1,389
Mon 26/1019:05 -
1 stop19h 30m
Sun 8/1111:20 -
1 stop17h 12m
Deal found 29/9$1,425
Sun 18/1010:50 -
1 stop27h 30m
Mon 2/1111:20 -
1 stop17h 12m
Deal found 30/9$1,436
Sun 29/1115:15 -
1 stop23h 20m
Sun 6/1211:20 -
1 stop17h 12m
Deal found 27/9$1,440
Mon 26/1019:05 -
1 stop19h 30m
Sun 8/1106:20 -
2 stops22h 12m
Deal found 29/9$1,455
Tue 10/1110:10 -
1 stop28h 35m
Tue 17/1110:45 -
1 stop21h 47m
Deal found 26/9$1,455
Wed 11/1119:05 -
1 stop19h 30m
Wed 18/1109:00 -
2 stops24h 37m
Deal found 26/9$1,463
Sun 25/1019:05 -
2 stops23h 15m
Sun 1/1111:20 -
1 stop26h 02m
Deal found 27/9$1,465
Sat 14/1119:05 -
1 stop19h 40m
Sat 21/1110:45 -
1 stop25h 37m
Deal found 30/9$1,485
Mon 26/1010:10 -
1 stop28h 35m
Mon 2/1110:45 -
1 stop16h 47m
Deal found 26/9$1,488
Wed 11/1110:10 -
1 stop28h 35m
Wed 18/1110:45 -
1 stop25h 37m
Deal found 27/9$1,505
Mon 26/1015:15 -
1 stop23h 30m
Mon 2/1106:10 -
2 stops21h 22m
Deal found 26/9$1,531

Find flight deals from Seattle to Australia

Round-trip from

$1,370

One-way from

$701

Popular in

December

Cheapest in

August

Average price

$1,541
Air Canada
  • Air Canada
  • 8/11-22/11
  • 2 total stops
  • 49h 22m total
  • Seattle to Australia
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 3/3-31/12
  • 1 total stop
  • 41h 20m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($524 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($125 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

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Tue 20/10

20:00-05:00

1 stop40h 00m

Brisbane

Wed 31/12

00:00-06:00

Nonstop0h 00m

$808

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 15/11

05:05-09:20

2 stops33h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$816

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 14/11

22:56-07:00

2 stops37h 04m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$816

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 18/11

12:45-09:05

2 stops25h 20m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$816

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Mon 16/11

21:30-07:20

1 stop41h 50m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$827

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

$857

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Mon 16/11

19:48-19:55

3 stops56h 07m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$873

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 27/11

12:45-09:05

2 stops25h 20m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$900

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Fri 13/11

20:09-10:00

2 stops43h 51m

Brisbane

Wed 31/12

00:00-06:00

Nonstop0h 00m

$915

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Tue 1/12

08:40-08:25

1 stop31h 45m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$923

Flights are sorted by cheapest return flights first.

Deals found on 28/9

Showing 1-10 of 60 resultsSorted by cheapest first
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

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 $1,488). Flying from Seattle to Australia in December is currently the most expensive (average of $2,438). 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 23 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
10,270 reviews
Check prices

Crew

8.1

Overall

7.4

Food

6.7

Entertainment

7.1

Boarding

7.7

Comfort

7.3

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
7.4
Good
10,270 reviews
United Airlines
7.4
Good
10,270 reviews
Check prices

Crew

8.1

Overall

7.4

Food

6.7

Entertainment

7.1

Boarding

7.7

Comfort

7.3

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?

    Delta, United Airlines, and Cathay Pacific can get you from Seattle to Australia in just under 19h 17m. Your travel time can differ by up to 25h 13m. 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 Air Canada, which is currently one of the cheapest options available, starting at $617. United Airlines flights start at $638 while deals on Qantas Airways start at $653 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 - Perth 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 $1,488). Flying from Seattle to Australia in December is currently the most expensive (average of $2,438). 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$1,453Average$1,570FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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.