Cheap flights from Seattle to Australia from $563

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
3 Sep — 10 Sep1
1 adult

Cheap flight deals from Seattle to Australia

Keep the following information in mind while searching for Seattle to Australia flight deals. Data was last updated 29 August 2025.

Round-trip from

$1,231

One-way from

$563

Popular in

December

Cheapest in

February

Average price

$1,665
Qantas Airways
  • Qantas Airways
  • 4/11-11/11
  • 2 total stops
  • 42h 12m total
  • Seattle to Australia
Air Canada
  • Air Canada
  • 1/9
  • 1 total stop
  • 23h 25m total
  • Seattle to Australia
Highest demand for flights based on searches. 12% potential increase in price ($373 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease ($68 potential savings vs. average return price).
Average for round-trip flights in August 2025

Find flight deals from Seattle to Australia

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 29 August 2025.

Tue 4/1116:30SEA - SYD
1 stop21h 30mQantas Airways
Tue 11/1111:20SYD - SEA
1 stop20h 42mQantas Airways
Deal found 26/8$1,231
Sun 19/1019:15SEA - SYD
2 stops22h 25mAir Canada
Tue 28/1008:00SYD - SEA
2 stops24h 26mAir Canada
Deal found 28/8$1,245
Sat 18/1017:59SEA - SYD
1 stop20h 06mMultiple Airlines
Wed 22/1017:20SYD - SEA
2 stops30h 54mMultiple Airlines
Deal found 28/8$1,246
Wed 1/1008:25SEA - SYD
1 stop18h 20mAlaska Airlines
Thu 16/1021:40SYD - SEA
1 stop18h 15mAlaska Airlines
Deal found 27/8$1,254
Fri 5/908:15SEA - SYD
1 stop18h 30mHawaiian Airlines
Sat 13/921:40SYD - SEA
1 stop25h 35mHawaiian Airlines
Deal found 27/8$1,258
Mon 1/1218:41SEA - SYD
1 stop19h 19mAmerican Airlines
Sun 14/1217:45SYD - SEA
1 stop23h 40mAmerican Airlines
Deal found 28/8$1,266
Sat 1/1107:00SEA - SYD
1 stop18h 45mAlaska Airlines
Thu 6/1121:40SYD - SEA
2 stops20h 12mAlaska Airlines
Deal found 27/8$1,268
Wed 10/1220:00SEA - SYD
1 stop39h 55mAir Canada
Thu 25/1216:00SYD - SEA
1 stop25h 06mAir Canada
Deal found 28/8$1,269
Thu 25/1205:50SEA - SYD
1 stop30h 05mAir Canada
Thu 15/109:00SYD - SEA
2 stops24h 26mAir Canada
Deal found 28/8$1,271
Mon 3/1114:55SEA - SYD
2 stops23h 05mAmerican Airlines
Mon 24/1111:20SYD - SEA
1 stop25h 51mAmerican Airlines
Deal found 28/8$1,272
Mon 20/1014:42SEA - SYD
1 stop22h 48mAmerican Airlines
Wed 5/1111:20SYD - SEA
2 stops21h 48mAmerican Airlines
Deal found 28/8$1,274
Mon 10/1116:30SEA - SYD
1 stop21h 30mQantas Airways
Sun 23/1117:45SYD - SEA
1 stop19h 26mQantas Airways
Deal found 28/8$1,277

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 29 August 2025.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Seattle

Fly to

Australia

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/11

16:30-09:00

1 stop21h 30m

Sydney Kingsford Smith

Tue 11/11

11:20-13:02

1 stop20h 42m

$1,231

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/10

19:15-11:40

2 stops22h 25m

Sydney Kingsford Smith

Sun 26/10

08:00-14:26

2 stops24h 26m

$1,245

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/9

19:15-11:40

2 stops23h 25m

Sydney Kingsford Smith

Wed 24/9

06:30-09:22

2 stops19h 52m

$1,245

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/10

19:15-11:40

2 stops22h 25m

Sydney Kingsford Smith

Tue 28/10

08:00-14:26

2 stops24h 26m

$1,245

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 18/10

17:59-08:05

1 stop20h 06m

Sydney Kingsford Smith

Wed 22/10

17:20-06:14

2 stops30h 54m

$1,246

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 10/2

20:00-14:15

2 stops23h 15m

Melbourne

Fri 27/2

07:10-09:31

2 stops21h 21m

$1,246

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 10/2

20:00-15:15

2 stops24h 15m

Melbourne

Thu 19/3

07:10-15:01

2 stops25h 51m

$1,248

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 1/10

08:25-19:45

1 stop18h 20m

Sydney Kingsford Smith

Sun 19/10

21:40-07:00

1 stop27h 20m

$1,254

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 1/10

08:25-19:45

1 stop18h 20m

Sydney Kingsford Smith

Thu 16/10

21:40-21:55

1 stop18h 15m

$1,254

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 1/10

08:25-19:45

1 stop18h 20m

Sydney Kingsford Smith

Fri 17/10

21:40-21:55

1 stop18h 15m

$1,254

Flights are sorted by cheapest return flights first.

Deals found on 28/8

Showing 1-10 of 60 results
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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, May is the cheapest month in which you can book a flight from Seattle to Australia (average of $129). Flying from Seattle to Australia in October is currently the most expensive (average of $171). 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.

What is the cheapest time of day to fly from SEA to AU?

Find hourly flight availability from Seattle to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 August 2025.

When flying from Seattle to Australia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 29 August 2025.
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.

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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?

    Qantas Airways, Air Canada, and United Airlines can get you from Seattle to Australia in just under 21h 30m. Your travel time can differ by up to 10h 44m. 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 most popular routes 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, May is the cheapest month in which you can book a flight from Seattle to Australia (average of $129). Flying from Seattle to Australia in October is currently the most expensive (average of $171). 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

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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 29 August 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,224Average$1,920FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,288Average$1,747FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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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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