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Cheap flights from Seattle to Australia from $740

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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
6 Sep — 13 Sep1
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 7 August 2026.

Thu 5/1111:06 -
1 stop24h 19m
Mon 16/1114:00 -
2 stops23h 26m
Deal found 2/8$1,314
Wed 11/1115:15 -
1 stop23h 20m
Mon 30/1111:20 -
1 stop26h 02m
Deal found 5/8$1,332
Wed 19/819:20 -
1 stop19h 00m
Wed 16/909:20 -
1 stop17h 45m
Deal found 4/8$1,334
Wed 9/915:00 -
1 stop23h 20m
Wed 16/909:20 -
1 stop22h 02m
Deal found 6/8$1,335
Tue 10/1111:06 -
1 stop24h 19m
Wed 18/1114:00 -
2 stops23h 26m
Deal found 3/8$1,338
Sun 25/1008:40 -
1 stop29h 55m
Tue 24/1111:20 -
1 stop17h 07m
Deal found 5/8$1,346
Tue 15/915:00 -
1 stop23h 20m
Sun 27/909:20 -
1 stop22h 02m
Deal found 4/8$1,348
Thu 12/1111:06 -
1 stop24h 19m
Wed 18/1114:00 -
2 stops23h 26m
Deal found 3/8$1,352
Wed 19/819:20 -
1 stop19h 00m
Wed 16/906:00 -
2 stops21h 05m
Deal found 4/8$1,362
Wed 9/915:00 -
1 stop23h 20m
Wed 16/906:00 -
2 stops21h 05m
Deal found 6/8$1,363
Wed 21/1010:30 -
1 stop27h 35m
Wed 4/1110:45 -
1 stop25h 37m
Deal found 5/8$1,383
Mon 9/1111:06 -
1 stop27h 24m
Wed 18/1113:45 -
2 stops23h 41m
Deal found 3/8$1,389

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 7 August 2026.

Round-trip from

$1,314

One-way from

$740

Popular in

December

Cheapest in

August

Average price

$1,062
5/11-16/11
  • 5/11-16/11
  • 3 total stops
  • 47h 45m total
  • Seattle to Australia
Search Deals
American Airlines
  • American Airlines
  • 10/8
  • 1 total stop
  • 24h 12m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($492 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($108 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 7 August 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 Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Fri 28/8

13:16-08:15

1 stop25h 59m

Melbourne

Fri 11/9

09:30-15:45

1 stop23h 15m

$1,483

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Tue 18/8

13:25-07:50

2 stops49h 25m

Melbourne

Fri 28/8

10:00-18:44

2 stops25h 44m

$1,497

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Mon 5/10

12:35-08:50

1 stop26h 15m

Melbourne

Tue 13/10

11:00-12:27

1 stop19h 27m

$1,562
Fastest return journey

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Sun 1/11

17:45-09:50

1 stop21h 05m

Melbourne

Wed 11/11

12:00-15:17

1 stop22h 17m

$1,562

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Wed 9/9

08:40-07:30

2 stops29h 50m

Melbourne

Mon 21/9

10:55-12:20

1 stop18h 25m

$1,575

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Wed 28/10

08:30-08:30

2 stops30h 00m

Melbourne

Tue 10/11

12:45-12:20

1 stop18h 35m

$1,575

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Wed 13/1

14:10-07:00

2 stops22h 50m

Brisbane

Wed 3/2

08:20-15:48

2 stops25h 28m

$1,596

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Fri 25/9

13:24-07:50

2 stops25h 26m

Melbourne

Fri 23/10

11:00-16:45

1 stop23h 45m

$1,611

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 20/9

13:24-06:50

2 stops24h 26m

Sydney Kingsford Smith

Sun 4/10

10:15-16:50

2 stops24h 35m

$1,625

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 12/12

15:15-08:35

2 stops22h 20m

Sydney Kingsford Smith

Tue 12/1

09:55-16:47

2 stops25h 52m

$1,663

Flights are sorted by cheapest return flights first.

Deals found on 2/8

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, February is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,375). Flying from Seattle to Australia in December is currently the most expensive (average of $2,385). 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 90 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 7 August 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
10,073 reviews
Check prices

Overall

7.4

Food

6.7

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.4
Good
10,073 reviews
United Airlines
7.4
Good
10,073 reviews
Check prices

Overall

7.4

Food

6.7

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
Air Canada
7.1
Good
11,431 reviews
United Airlines
7.4
Good
10,073 reviews
Check prices

Overall

7.4

Food

6.7

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

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 Air New Zealand can get you from Seattle to Australia in just under 25h 25m. Your travel time can differ by up to 24h. There are 11856 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 United Airlines, which is currently one of the cheapest options available, starting at $570. Air Canada flights start at $611 while deals on Qantas Airways start at $647 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, February is the cheapest month in which you can book a flight from Seattle to Australia (average of $1,375). Flying from Seattle to Australia in December is currently the most expensive (average of $2,385). 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 7 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$614Average$1,750FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,437Average$1,552FlexibilityNo 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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