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Cheap flights from Seattle to Australia from $742

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 11/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
26 Jun — 3 Jul1
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 27 May 2026.

Sun 9/806:03
SEA
-
MEL
1 stop31h 42m
Multiple Airlines
Sun 23/809:45
MEL
-
SEA
1 stop19h 35m
Multiple Airlines
Deal found 27/5$1,405
Mon 3/807:26
SEA
-
MEL
1 stop30h 19m
Multiple Airlines
Mon 31/809:45
MEL
-
SEA
1 stop19h 35m
Multiple Airlines
Deal found 26/5$1,411
Sun 24/519:20
SEA
-
SYD
1 stop19h 00m
Air Canada
Sun 7/609:20
SYD
-
SEA
1 stop30h 20m
Air Canada
Deal found 23/5$1,412
Tue 28/719:20
SEA
-
SYD
1 stop19h 00m
Air Canada
Tue 11/809:20
SYD
-
SEA
1 stop22h 02m
Air Canada
Deal found 26/5$1,462
Sun 5/705:45
SEA
-
SYD
1 stop32h 35m
Air Canada
Sun 12/709:20
SYD
-
SEA
1 stop17h 47m
Air Canada
Deal found 25/5$1,464
Wed 10/617:14
SEA
-
MEL
1 stop20h 31m
Multiple Airlines
Fri 3/718:00
MEL
-
SEA
2 stops31h 13m
Multiple Airlines
Deal found 23/5$1,475
Sun 7/615:00
SEA
-
SYD
1 stop23h 20m
Air Canada
Sun 14/609:20
SYD
-
SEA
1 stop30h 20m
Air Canada
Deal found 24/5$1,476
Sun 26/705:45
SEA
-
SYD
1 stop32h 35m
Air Canada
Sun 9/809:20
SYD
-
SEA
1 stop26h 12m
Air Canada
Deal found 27/5$1,478
Sun 25/1008:40
SEA
-
SYD
1 stop29h 55m
Air Canada
Sun 1/1111:20
SYD
-
SEA
1 stop16h 57m
Air Canada
Deal found 24/5$1,481
Mon 8/605:45
SEA
-
SYD
1 stop32h 35m
Multiple Airlines
Sun 14/609:20
SYD
-
SEA
1 stop30h 20m
Multiple Airlines
Deal found 24/5$1,486
Tue 28/719:20
SEA
-
SYD
1 stop19h 00m
Multiple Airlines
Tue 11/806:00
SYD
-
SEA
2 stops21h 07m
Multiple Airlines
Deal found 26/5$1,490
Fri 25/915:58
SEA
-
MEL
1 stop21h 47m
Qantas Airways
Fri 23/1009:45
MEL
-
SEA
1 stop20h 31m
Qantas Airways
Deal found 26/5$1,497

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 27 May 2026.

Round-trip from

$1,405

One-way from

$742

Popular in

December

Cheapest in

August

Average price

$1,471
9/8-23/8
  • 9/8-23/8
  • 2 total stops
  • 51h 17m total
  • Seattle to Australia
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 11/8
  • 1 total stop
  • 39h 50m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($442 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($101 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 27 May 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

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 5/8

17:20-08:15

1 stop21h 55m

Melbourne

Sun 23/8

09:30-21:15

2 stops28h 45m

$1,528

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 7/7

19:05-08:15

1 stop20h 10m

Melbourne

Wed 22/7

09:30-21:10

2 stops28h 40m

$1,530

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 25/6

20:25-07:50

1 stop42h 25m

Melbourne

Fri 3/7

10:00-09:05

2 stops40h 05m

$1,556

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 7/9

17:20-08:15

1 stop21h 55m

Melbourne

Mon 14/9

07:15-16:14

2 stops25h 59m

$1,557

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 25/7

10:29-08:15

1 stop28h 46m

Melbourne

Sat 8/8

06:00-21:19

3 stops32h 19m

$1,557

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 29/9

13:30-07:50

2 stops49h 20m

Melbourne

Wed 21/10

11:00-16:53

2 stops23h 53m

$1,562

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 9/8

17:04-10:35

2 stops24h 31m

Melbourne

Sun 23/8

09:30-17:42

2 stops25h 12m

$1,574

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 28/6

21:10-18:50

1 stop28h 40m

Sydney Kingsford Smith

Sun 5/7

20:45-23:59

1 stop20h 14m

$1,605

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Wed 12/8

08:00-22:50

2 stops21h 50m

Melbourne Avalon

Sat 29/8

16:40-23:53

2 stops24h 13m

$1,675

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 8/7

09:30-07:50

2 stops29h 20m

Melbourne

Fri 17/7

10:00-23:59

2 stops30h 59m

$1,720

Flights are sorted by cheapest return flights first.

Deals found on 22/5

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 $136). Flying from Seattle to Australia in September is currently the most expensive (average of $1,089). 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 72 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

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 27 May 2026.
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
9,751 reviews
Check prices

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,751 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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 Alaska Airlines can get you from Seattle to Australia in just under 21h 55m. Your travel time can differ by up to 20h 30m. There are 13164 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 $514. Qantas Airways flights start at $517 while deals on United Airlines start at $561 one-way.

  • What are the most popular routes from Seattle to Australia?

    Most travellers choose Seattle/Tacoma Intl - Melbourne, Seattle/Tacoma Intl - Sydney Kingsford Smith or Seattle/Tacoma Intl - Melbourne Avalon 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 $136). Flying from Seattle to Australia in September is currently the most expensive (average of $1,089). 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 airline flying from Seattle to Australia

Discover the top airline 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 27 May 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,118Average$2,017FlexibilityNo 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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