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Cheap flights from Seattle to Australia from $666

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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
19 May — 26 May1
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 19 April 2026.

Sun 1/1123:55
SEA
-
SYD
1 stop38h 50m
Philippine Airlines
Mon 30/1111:35
SYD
-
SEA
1 stop26h 00m
Philippine Airlines
Deal found 16/4$965
Fri 4/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Sun 13/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 16/4$1,234
Wed 27/511:21
SEA
-
SYD
2 stops31h 29m
Multiple Airlines
Wed 3/613:20
SYD
-
SEA
3 stops37h 46m
Multiple Airlines
Deal found 15/4$1,320
Sun 10/506:10
SEA
-
SYD
1 stop31h 55m
American Airlines
Sun 24/512:00
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 16/4$1,352
Sat 16/511:06
SEA
-
SYD
2 stops31h 44m
Multiple Airlines
Sat 23/513:15
SYD
-
SEA
3 stops37h 51m
Multiple Airlines
Deal found 16/4$1,357
Sun 2/814:20
SEA
-
SYD
1 stop24h 10m
American Airlines
Wed 19/809:10
SYD
-
SEA
1 stop18h 45m
American Airlines
Deal found 14/4$1,363
Tue 12/510:00
SEA
-
SYD
1 stop28h 05m
American Airlines
Mon 8/612:00
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 17/4$1,365
Wed 13/514:57
SEA
-
SYD
2 stops23h 08m
American Airlines
Sun 24/512:00
SYD
-
SEA
1 stop24h 17m
American Airlines
Deal found 15/4$1,369
Tue 2/611:43
SEA
-
SYD
1 stop26h 12m
American Airlines
Wed 17/609:10
SYD
-
SEA
1 stop29h 39m
American Airlines
Deal found 15/4$1,373
Wed 21/1017:59
SEA
-
MEL
2 stops25h 01m
Fiji Airways
Wed 11/1113:45
MEL
-
SEA
2 stops22h 11m
Fiji Airways
Deal found 16/4$1,483
Wed 28/1016:20
SEA
-
MEL
2 stops26h 05m
Multiple Airlines
Wed 11/1113:45
MEL
-
SEA
2 stops22h 11m
Multiple Airlines
Deal found 16/4$1,511
Wed 22/417:45
SEA
-
MEL
1 stop21h 30m
United Airlines
Wed 13/509:30
MEL
-
SEA
1 stop19h 07m
United Airlines
Deal found 18/4$1,515

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 19 April 2026.

Round-trip from

$1,234

One-way from

$666

Popular in

December

Cheapest in

August

Average price

$1,485
Philippine Airlines
  • Philippine Airlines
  • 4/9-13/9
  • 2 total stops
  • 66h 40m total
  • Seattle to Australia
Search Deals
12/8
  • 12/8
  • 3 total stops
  • 54h 27m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($406 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($95 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 19 April 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

Cheapest return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 10/5

16:32-07:00

1 stop21h 28m

Sydney Kingsford Smith

Sun 24/5

09:30-21:09

2 stops28h 39m

$1,521

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 1/6

17:20-08:15

1 stop21h 55m

Melbourne

Mon 8/6

10:55-16:20

1 stop22h 25m

$1,522

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 5/6

17:04-07:30

1 stop21h 26m

Melbourne

Fri 12/6

10:55-19:03

1 stop25h 08m

$1,524
Fastest return journey

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 9/6

14:36-08:15

2 stops24h 39m

Melbourne

Tue 16/6

10:55-12:34

1 stop18h 39m

$1,529

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/6

17:35-06:50

1 stop20h 15m

Sydney Kingsford Smith

Mon 8/6

09:15-16:47

1 stop24h 32m

$1,534

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

08:38-06:55

1 stop29h 17m

Sydney Kingsford Smith

Mon 25/5

10:20-14:30

1 stop21h 10m

$1,534

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 13/5

11:39-06:55

1 stop26h 16m

Sydney Kingsford Smith

Wed 10/6

09:30-19:18

1 stop26h 48m

$1,534

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 29/4

11:10-06:50

2 stops26h 40m

Sydney Kingsford Smith

Wed 6/5

09:15-12:37

1 stop20h 22m

$1,538

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 12/5

08:38-07:00

3 stops29h 22m

Sydney Kingsford Smith

Wed 27/5

09:30-14:36

1 stop22h 06m

$1,541

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/5

15:40-07:00

2 stops46h 20m

Sydney Kingsford Smith

Wed 27/5

09:30-15:55

2 stops23h 25m

$1,560

Flights are sorted by cheapest return flights first.

Deals found on 17/4

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 $135). Flying from Seattle to Australia in March is currently the most expensive (average of $1,085). 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 19 April 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
9,605 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,605 reviews
United Airlines
7.4
Good
9,605 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Air Canada
7.1
Good
10,939 reviews
United Airlines
7.4
Good
9,605 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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?

    United Airlines, Delta, and American Airlines can get you from Seattle to Australia in just under 20h 15m. Your travel time can differ by up to 4h 38m. 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 $512. Qantas Airways flights start at $515 while deals on United Airlines start at $559 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, January is the cheapest month in which you can book a flight from Seattle to Australia (average of $135). Flying from Seattle to Australia in March is currently the most expensive (average of $1,085). 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 19 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$602Average$1,759FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,114Average$2,009FlexibilityNo 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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