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Cheap flights from Seattle to Australia from $626

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 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
1 May — 8 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 1 April 2026.

Wed 13/511:06
SEA
-
SYD
2 stops31h 44m
Multiple Airlines
Wed 27/513:20
SYD
-
SEA
3 stops37h 46m
Multiple Airlines
Deal found 28/3$1,320
Tue 12/510:45
SEA
-
BNE
1 stop27h 20m
Air Canada
Tue 19/510:15
BNE
-
SEA
1 stop21h 05m
Air Canada
Deal found 28/3$1,330
Sun 24/505:50
SEA
-
BNE
1 stop32h 15m
Air Canada
Sun 31/510:00
BNE
-
SEA
1 stop17h 05m
Air Canada
Deal found 31/3$1,334
Tue 26/519:20
SEA
-
BNE
1 stop18h 45m
Air Canada
Sun 7/610:00
BNE
-
SEA
1 stop25h 33m
Air Canada
Deal found 31/3$1,349
Sun 19/410:20
SEA
-
SYD
1 stop28h 00m
Air Canada
Mon 11/509:20
SYD
-
SEA
1 stop30h 20m
Air Canada
Deal found 28/3$1,366
Tue 21/418:59
SEA
-
SYD
1 stop19h 31m
Qantas Airways
Tue 5/509:10
SYD
-
SEA
1 stop20h 51m
Qantas Airways
Deal found 28/3$1,368
Mon 20/418:59
SEA
-
SYD
1 stop19h 31m
Qantas Airways
Mon 4/517:50
SYD
-
SEA
1 stop19h 03m
Qantas Airways
Deal found 30/3$1,371
Tue 12/514:55
SEA
-
BNE
1 stop23h 10m
Multiple Airlines
Tue 19/520:40
BNE
-
SEA
2 stops30h 25m
Multiple Airlines
Deal found 28/3$1,372
Wed 27/519:20
SEA
-
BNE
1 stop18h 45m
Multiple Airlines
Sat 6/619:25
BNE
-
SEA
2 stops31h 43m
Multiple Airlines
Deal found 31/3$1,375
Wed 13/510:00
SEA
-
SYD
1 stop28h 05m
Qantas Airways
Sun 31/509:10
SYD
-
SEA
1 stop29h 39m
Qantas Airways
Deal found 30/3$1,381
Wed 13/514:55
SEA
-
BNE
1 stop23h 10m
Air Canada
Thu 21/510:15
BNE
-
SEA
1 stop21h 05m
Air Canada
Deal found 1/4$1,388
Mon 25/514:55
SEA
-
BNE
1 stop23h 10m
Multiple Airlines
Mon 8/610:00
BNE
-
SEA
1 stop17h 08m
Multiple Airlines
Deal found 31/3$1,393

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 1 April 2026.

Round-trip from

$1,320

One-way from

$626

Popular in

December

Cheapest in

August

Average price

$1,716
13/5-27/5
  • 13/5-27/5
  • 5 total stops
  • 69h 30m total
  • Seattle to Australia
Search Deals
22/4
  • 22/4
  • 2 total stops
  • 31h 53m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($398 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($97 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 1 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

10:15-06:50

1 stop27h 35m

Sydney Kingsford Smith

Sun 24/5

09:15-15:10

1 stop22h 55m

$1,425

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/4

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

Mon 11/5

09:15-15:23

2 stops23h 08m

$1,432

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 22/4

17:59-06:50

1 stop19h 51m

Sydney Kingsford Smith

Tue 5/5

09:15-12:25

2 stops20h 10m

$1,432

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/4

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

Mon 4/5

09:15-23:59

2 stops31h 44m

$1,446

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Tue 23/6

19:20-14:20

2 stops26h 00m

Melbourne Avalon

Sun 19/7

20:55-09:52

2 stops29h 57m

$1,486

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 1/8

09:26-06:50

2 stops28h 24m

Sydney Kingsford Smith

Fri 14/8

09:15-16:52

2 stops24h 37m

$1,526

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 23/4

09:50-06:50

2 stops28h 00m

Sydney Kingsford Smith

Thu 7/5

09:15-10:55

1 stop18h 40m

$1,526

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 6/7

19:20-13:55

2 stops26h 05m

Adelaide

Fri 24/7

19:35-10:07

2 stops31h 02m

$1,544

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 16/9

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

Wed 30/9

09:15-18:29

2 stops26h 14m

$1,572

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 9/7

05:25-06:50

2 stops32h 25m

Sydney Kingsford Smith

Tue 28/7

09:15-16:27

2 stops24h 12m

$1,732

Flights are sorted by cheapest return flights first.

Deals found on 29/3

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 $620). Flying from Seattle to Australia in December is currently the most expensive (average of $1,230). 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 1 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
9,529 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,529 reviews
United Airlines
7.4
Good
9,529 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Air Canada
7.1
Good
10,873 reviews
United Airlines
7.4
Good
9,529 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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?

    Delta, Qantas Airways, and Qatar Airways can get you from Seattle to Australia in just under 24h 46m. Your travel time can differ by up to 10h 24m. 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 $534. Qantas Airways flights start at $537 while deals on United Airlines start at $584 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 - 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 $620). Flying from Seattle to Australia in December is currently the most expensive (average of $1,230). 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 1 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$629Average$1,836FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,162Average$2,097FlexibilityNo 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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