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Cheap flights from Seattle to Australia from $514

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
16 Apr — 23 Apr1
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 17 March 2026.

Wed 23/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 30/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 14/3$1,018
Wed 29/419:06
SEA
-
SYD
1 stop18h 59m
Qantas Airways
Wed 6/509:10
SYD
-
SEA
1 stop23h 40m
Qantas Airways
Deal found 15/3$1,225
Wed 29/420:00
SEA
-
BNE
1 stop18h 05m
Air Canada
Wed 6/510:00
BNE
-
SEA
1 stop16h 50m
Air Canada
Deal found 15/3$1,231
Mon 27/419:06
SEA
-
SYD
1 stop19h 24m
Qantas Airways
Mon 4/517:50
SYD
-
SEA
1 stop22h 02m
Qantas Airways
Deal found 13/3$1,245
Tue 28/719:15
SEA
-
SYD
1 stop18h 50m
Multiple Airlines
Tue 11/817:50
SYD
-
SEA
1 stop20h 09m
Multiple Airlines
Deal found 16/3$1,250
Wed 29/410:20
SEA
-
BNE
1 stop27h 45m
Air Canada
Sun 10/510:00
BNE
-
SEA
1 stop16h 50m
Air Canada
Deal found 15/3$1,252
Mon 13/417:59
SEA
-
SYD
1 stop20h 31m
Multiple Airlines
Tue 28/409:10
SYD
-
SEA
1 stop20h 51m
Multiple Airlines
Deal found 15/3$1,257
Sat 18/421:15
SEA
-
SYD
1 stop41h 15m
Multiple Airlines
Mon 11/509:10
SYD
-
SEA
1 stop19h 42m
Multiple Airlines
Deal found 13/3$1,260
Mon 13/415:40
SEA
-
SYD
1 stop22h 40m
Air Canada
Wed 29/409:20
SYD
-
SEA
1 stop22h 45m
Air Canada
Deal found 13/3$1,261
Mon 18/518:14
SEA
-
SYD
1 stop19h 51m
Multiple Airlines
Wed 3/617:50
SYD
-
SEA
1 stop21h 09m
Multiple Airlines
Deal found 13/3$1,262
Wed 6/517:06
SEA
-
SYD
1 stop20h 59m
Qantas Airways
Wed 27/509:10
SYD
-
SEA
1 stop20h 53m
Qantas Airways
Deal found 15/3$1,264
Sun 19/418:40
SEA
-
SYD
1 stop19h 25m
Qantas Airways
Mon 11/517:50
SYD
-
SEA
1 stop19h 03m
Qantas Airways
Deal found 16/3$1,267

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 17 March 2026.

Round-trip from

$1,048

One-way from

$514

Popular in

December

Cheapest in

August

Average price

$1,440
Philippine Airlines
  • Philippine Airlines
  • 3/9-10/9
  • 2 total stops
  • 66h 40m total
  • Seattle to Australia
Search Deals
12/5
  • 12/5
  • 2 total stops
  • 30h 34m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($379 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($92 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 17 March 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
Fastest return journey

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 1/5

19:20-07:05

1 stop18h 45m

Brisbane

Fri 8/5

10:00-14:20

1 stop21h 20m

$1,358

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 1/5

19:20-12:05

2 stops23h 45m

Brisbane

Fri 8/5

10:00-09:50

1 stop16h 50m

$1,397

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Fri 22/5

19:20-14:20

2 stops26h 00m

Melbourne Avalon

Mon 25/5

16:40-14:20

2 stops38h 40m

$1,434

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/8

11:25-06:50

2 stops26h 25m

Sydney Kingsford Smith

Sat 15/8

09:15-20:28

1 stop28h 13m

$1,501

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/5

23:33-07:05

2 stops38h 32m

Sydney Kingsford Smith

Sat 9/5

21:50-22:58

2 stops42h 08m

$1,501

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 22/7

18:55-06:50

1 stop18h 55m

Sydney Kingsford Smith

Sun 9/8

09:15-14:43

1 stop22h 28m

$1,521

SeattleMaroochydore

SEA - MCY

SEAMCY

Seattle/Tacoma Intl

Tue 28/4

19:04-15:15

2 stops27h 11m

Maroochydore Sunshine Coast

Tue 5/5

08:15-19:53

2 stops28h 38m

$1,521

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/7

23:52-06:55

2 stops38h 03m

Sydney Kingsford Smith

Sun 9/8

10:20-14:30

1 stop21h 10m

$1,528

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Mon 27/4

18:40-10:45

2 stops23h 05m

Hobart

Mon 4/5

11:25-19:53

2 stops25h 28m

$1,563

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/8

19:05-06:55

1 stop18h 50m

Sydney Kingsford Smith

Thu 13/8

09:30-21:11

2 stops28h 41m

$1,592

Flights are sorted by cheapest return flights first.

Deals found on 15/3

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 $605). Flying from Seattle to Australia in December is currently the most expensive (average of $1,200). 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 17 March 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
9,431 reviews
Check prices

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

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
9,431 reviews
United Airlines
7.4
Good
9,431 reviews
Check prices

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

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
10,811 reviews
United Airlines
7.4
Good
9,431 reviews
Check prices

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

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?

    Air Canada, Cathay Pacific, and American Airlines can get you from Seattle to Australia in just under 18h 45m. Your travel time can differ by up to 24h 30m. There are 11822 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 $521. Qantas Airways flights start at $524 while deals on United Airlines start at $569 one-way.

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

    Most travellers choose Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Brisbane or Seattle/Tacoma Intl - Melbourne 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 $605). Flying from Seattle to Australia in December is currently the most expensive (average of $1,200). 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 17 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$614Average$1,674FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,134Average$2,046FlexibilityNo 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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