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Cheap flights from Seattle to Australia from $699

SEA — SYD
17 Nov — 24 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

Mon 9/1107:00 -
1 stop17h 45m
Tue 17/1121:40 -
1 stop18h 45m
Deal found 14/10$1,390
Mon 9/1115:15 -
2 stops28h 25m
Tue 17/1111:20 -
1 stop17h 12m
Deal found 13/10$1,410
Sun 18/1020:45 -
1 stop28h 05m
Tue 3/1121:40 -
2 stops27h 20m
Deal found 16/10$1,417
Sun 18/1009:00 -
1 stop39h 50m
Tue 3/1121:40 -
1 stop27h 28m
Deal found 15/10$1,420
Sun 15/1108:40 -
1 stop29h 55m
Sun 22/1111:20 -
1 stop26h 02m
Deal found 18/10$1,442
Sun 15/1113:00 -
1 stop35h 45m
Tue 1/1221:40 -
2 stops28h 40m
Deal found 16/10$1,443
Sun 15/1110:10 -
1 stop28h 25m
Sun 22/1106:20 -
2 stops22h 07m
Deal found 18/10$1,456
Tue 17/1119:05 -
1 stop19h 30m
Tue 24/1109:00 -
2 stops24h 37m
Deal found 17/10$1,464
Sun 15/1119:05 -
2 stops26h 35m
Mon 23/1111:20 -
1 stop17h 12m
Deal found 17/10$1,472
Tue 10/1119:05 -
2 stops23h 10m
Tue 17/1111:20 -
1 stop22h 12m
Deal found 14/10$1,485
Sat 31/1015:15 -
1 stop24h 30m
Tue 3/1110:45 -
1 stop25h 37m
Deal found 17/10$1,504
Mon 9/1115:15 -
1 stop23h 30m
Mon 16/1110:45 -
1 stop16h 42m
Deal found 13/10$1,505

Find flight deals from Seattle to Australia

Round-trip from

$1,390

One-way from

$699

Popular in

December

Cheapest in

August

Average price

$1,548
9/11-17/11
  • 9/11-17/11
  • 2 total stops
  • 36h 30m total
  • Seattle to Australia
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 1/3-31/12
  • 1 total stop
  • 41h 20m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($583 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($150 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 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

SeattlePerth

SEA Seattle/Tacoma Intl - PER Perth

SEAPER

Seattle/Tacoma Intl

Sat 28/11

08:40-08:25

1 stop31h 45m

Perth

Wed 31/12

00:00-08:00

Nonstop0h 00m

$784

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

$791

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Mon 18/1

19:59-08:30

1 stop18h 31m

Brisbane

Wed 31/12

00:00-06:00

Nonstop0h 00m

$813

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Sat 7/11

09:05-07:30

1 stop28h 25m

Brisbane

Wed 31/12

00:00-06:00

Nonstop0h 00m

$816

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Thu 3/12

13:16-07:30

1 stop24h 14m

Brisbane

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

05:35-08:30

2 stops31h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$817

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 28/11

21:20-08:30

1 stop40h 10m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$836
Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 18/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$842

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Tue 27/10

17:55-07:30

2 stops44h 35m

Brisbane

Wed 31/12

00:00-06:00

Nonstop0h 00m

$843

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

$858

Flights are sorted by cheapest return flights first.

Deals found on 13/10

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, August is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,504). Flying from Seattle to Australia in December is currently the most expensive (average of $2,431). 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
10,384 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.7

Overall

7.4

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
10,384 reviews
United Airlines
7.4
Good
10,384 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.7

Overall

7.4

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?

    United Airlines, Delta, and Alaska Airlines can get you from Seattle to Australia in just under 24h 05m. Your travel time can differ by up to 5h 25m. 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 $619. United Airlines flights start at $640 while deals on Qantas Airways start at $655 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, August is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,504). Flying from Seattle to Australia in December is currently the most expensive (average of $2,431). 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$1,456Average$1,573FlexibilityNo 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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