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Cheap flights from Seattle to Australia from $377

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Australia departing on 2/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Hawaiian Airlines Logo
7:00 am - 7:45 pmSEA-SYD
18h 45m1 stop
Hawaiian Airlines Logo
9:40 pm - 9:57 pmSYD-SEA
19h 17m1 stop
$815Hawaiian Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7
Philippine Airlines Logo
10:30 pm - 9:50 amSEA-SYD
41h 20m1 stop
Philippine Airlines Logo
11:35 am - 7:40 pmSYD-SEA
26h 05m1 stop
$820Philippine Airlines
Find Deal
Sun, Mar 8 - Thu, Mar 12
Qantas Airways Logo
5:47 pm - 9:00 amSEA-SYD
20h 13m1 stop
Qantas Airways Logo
11:20 am - 12:32 pmSYD-SEA
20h 12m1 stop
$827Qantas Airways
Find Deal
Mon, Nov 24 - Sun, Dec 7
Air Canada Logo
10:05 am - 9:35 amSEA-SYD
28h 30m1 stop
Air Canada Logo
11:20 am - 10:06 pmSYD-SEA
29h 46m1 stop
$831Air Canada
Find Deal
Sun, Feb 1 - Thu, Feb 19
Air Canada Logo
3:40 pm - 9:35 amSEA-SYD
22h 55m1 stop
Air Canada Logo
11:20 am - 10:06 pmSYD-SEA
29h 46m1 stop
$832Air Canada
Find Deal
Sun, Feb 1 - Wed, Feb 18
United Airlines Logo
12:35 pm - 9:15 amSEA-SYD
25h 40m1 stop
United Airlines Logo
12:10 pm - 11:18 amSYD-SEA
18h 08m1 stop
$836United Airlines
Find Deal
Fri, Jan 30 - Mon, Feb 16
United Airlines Logo
5:10 pm - 9:15 amSEA-SYD
21h 05m1 stop
United Airlines Logo
12:10 pm - 11:18 amSYD-SEA
18h 08m1 stop
$837United Airlines
Find Deal
Fri, Jan 30 - Tue, Feb 17
Delta Logo
1:30 pm - 6:50 amSEA-SYD
22h 20m2 stops
Delta Logo
2:15 pm - 5:00 pmSYD-SEA
21h 45m2 stops
$839Delta
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Thu, Feb 5 - Thu, Feb 19
Delta Logo
7:33 pm - 8:30 amSEA-SYD
41h 57m2 stops
Delta Logo
10:40 am - 8:31 pmSYD-SEA
28h 51m1 stop
$849Delta
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Fri, Jan 30 - Mon, Feb 16
Qantas Airways Logo
4:30 pm - 2:05 pmSEA-OOL
27h 35m2 stops
Qantas Airways Logo
10:25 am - 5:28 pmOOL-SEA
25h 03m2 stops
$1,033Qantas Airways
Find Deal
Wed, Nov 19 - Wed, Dec 3

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets
Qantas Airways
Nov 24
SEA5:47 pmSeattle/Tacoma Intl
20h 13m
1 stop
SYD9:00 amSydney Kingsford Smith
Dec 7
SYD11:20 amSydney Kingsford Smith
20h 12m
1 stop
SEA12:32 pmSeattle/Tacoma Intl
$827
Find similar
Qantas Airways
Nov 19
SEA4:30 pmSeattle/Tacoma Intl
27h 35m
2 stops
OOL2:05 pmCoolangatta Gold Coast
Dec 3
OOL10:25 amCoolangatta Gold Coast
25h 03m
2 stops
SEA5:28 pmSeattle/Tacoma Intl
$1,033
Find similar
Qantas Airways
Nov 19
SEA4:30 pmSeattle/Tacoma Intl
27h 35m
2 stops
OOL2:05 pmCoolangatta Gold Coast
Dec 3
OOL10:25 amCoolangatta Gold Coast
27h 05m
2 stops
SEA7:30 pmSeattle/Tacoma Intl
$1,034
Find similar

United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets
United Airlines
Jan 30
SEA12:35 pmSeattle/Tacoma Intl
25h 40m
1 stop
SYD9:15 amSydney Kingsford Smith
Feb 16
SYD12:10 pmSydney Kingsford Smith
18h 08m
1 stop
SEA11:18 amSeattle/Tacoma Intl
$836
Find similar
United Airlines
Jan 30
SEA5:10 pmSeattle/Tacoma Intl
21h 05m
1 stop
SYD9:15 amSydney Kingsford Smith
Feb 17
SYD12:10 pmSydney Kingsford Smith
18h 08m
1 stop
SEA11:18 amSeattle/Tacoma Intl
$837
Find similar
United Airlines
Jan 30
SEA12:24 pmSeattle/Tacoma Intl
25h 41m
1 stop
SYD9:05 amSydney Kingsford Smith
Feb 17
SYD12:10 pmSydney Kingsford Smith
18h 08m
1 stop
SEA11:18 amSeattle/Tacoma Intl
$838
Find similar

momondo Fare Finder

 
Customize 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
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

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 10/31

7:00 am-7:45 pm

1 stop18h 45m

Sydney Kingsford Smith

Fri 11/7

9:40 pm-9:57 pm

1 stop19h 17m

$815

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 3/8

10:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Thu 3/12

11:35 am-7:40 pm

1 stop26h 05m

$820

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 11/24

5:47 pm-9:00 am

1 stop20h 13m

Sydney Kingsford Smith

Sun 12/7

11:20 am-12:32 pm

1 stop20h 12m

$827

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/1

10:05 am-9:35 am

1 stop28h 30m

Sydney Kingsford Smith

Thu 2/19

11:20 am-10:06 pm

1 stop29h 46m

$831

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/1

3:40 pm-9:35 am

1 stop22h 55m

Sydney Kingsford Smith

Wed 2/18

11:20 am-10:06 pm

1 stop29h 46m

$832

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 1/30

12:35 pm-9:15 am

1 stop25h 40m

Sydney Kingsford Smith

Mon 2/16

12:10 pm-11:18 am

1 stop18h 08m

$836

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 1/30

5:10 pm-9:15 am

1 stop21h 05m

Sydney Kingsford Smith

Tue 2/17

12:10 pm-11:18 am

1 stop18h 08m

$837

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 2/5

1:30 pm-6:50 am

2 stops22h 20m

Sydney Kingsford Smith

Thu 2/19

2:15 pm-5:00 pm

2 stops21h 45m

$839

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 1/30

7:33 pm-8:30 am

2 stops41h 57m

Sydney Kingsford Smith

Mon 2/16

10:40 am-8:31 pm

1 stop28h 51m

$849

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Wed 11/19

4:30 pm-2:05 pm

2 stops27h 35m

Coolangatta Gold Coast

Wed 12/3

10:25 am-5:28 pm

2 stops25h 03m

$1,033

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Australia from

How to get the cheapest flight ticket from Seattle to Australia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Australia?

The month of September is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $941. If you aren’t able to travel during the month of September, then book flights to Australia from Seattle during February instead. Flights to Australia in February, while not as cheap as those in September, still average around $967.

What is the cheapest day to depart on your flight to Australia?

The cheapest day to depart from Seattle to Australia is on a Tuesday. Travelers who choose to depart for Australia on a Tuesday will often find tickets for as low as $1,078. On the other hand, Thursday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,156.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from Seattle in the evening is the least expensive time of day to depart. momondo users have found prices as low as $1,078 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,152 on average. Flights to Australia from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Australia?

You are more likely to see cheaper flights to Australia from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,093 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Seattle for as low as $932 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 5% on your flight if you consider stops on a Seattle to Australia flight.

Cheap Seattle to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Australia

Direct flights

None
There are no direct flights from Seattle to Australia. There are no popular flight routes from Seattle to Australia.
Search flight deals

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Australia?

    Prices for flights from Seattle/Tacoma Intl Airport to Australia are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Australia?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Australia?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Australia.

  • What documentation or ID do you need to fly to Australia?

    The travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Seattle to Australia

Compare and see reviews for airlines that fly from Seattle to Australia with momondo
Airline
Rating
Free Cancellation
Price
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
Qantas AirwaysPriceFrom $647Free CancellationRating
7.5
907 reviews
Search Qantas Airways flights
Air CanadaPriceFrom $789Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
ANAPriceFrom $794Free CancellationRating
8.4
964 reviews
Search ANA flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $826Free CancellationRating
7.8
2,729 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $836Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
7,961 reviews
Search Delta flights
Singapore AirlinesPriceFrom $1,218Free CancellationRating
8.1
1,367 reviews
Search Singapore Airlines flights
Qatar AirwaysPriceFrom $1,315Free CancellationRating
7.4
3,622 reviews
Search Qatar Airways flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Australia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Australia. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Australia with flexible booking policies on momondo?

All flight searches from Seattle to Australia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Australia?

momondo helps you find the best flight between Seattle and Australia by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to Australia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Australia, momondo offers a useful price alert feature which will track prices for flights to Australia from Seattle and alert you when they change.

An easier way to manage your Australia trip

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