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Cheap flights from Seattle to Australia from $379

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 3/24. 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

Enter your travel dates to find the best prices.
Air Canada Logo
8:00 pm - 8:45 amSEA-BNE
18h 45m1 stop
Air Canada Logo
10:45 am - 10:06 pmBNE-SEA
29h 21m1 stop
$791Air Canada
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Tue, Feb 10 - Tue, Feb 17
Multiple Airlines Logo
3:40 pm - 8:45 amSEA-BNE
23h 05m1 stop
Multiple Airlines Logo
6:10 am - 9:31 amBNE-SEA
21h 21m2 stops
$809Multiple Airlines
Find Deal
Thu, Feb 12 - Tue, Feb 24
Multiple Airlines Logo
8:00 pm - 8:45 amSEA-BNE
18h 45m1 stop
Multiple Airlines Logo
6:05 am - 9:31 amBNE-SEA
21h 26m2 stops
$815Multiple Airlines
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Tue, Feb 10 - Fri, Feb 27
United Airlines Logo
5:30 pm - 8:15 amSEA-MEL
21h 45m1 stop
United Airlines Logo
10:55 am - 2:18 pmMEL-SEA
20h 23m1 stop
$1,010United Airlines
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Fri, Apr 24 - Mon, May 4
United Airlines Logo
7:37 pm - 8:15 amSEA-MEL
19h 38m1 stop
United Airlines Logo
10:55 am - 9:12 pmMEL-SEA
27h 17m2 stops
$1,014United Airlines
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Fri, Apr 24 - Mon, May 4
Delta Logo
5:25 am - 8:00 amSEA-MEL
55h 35m2 stops
Delta Logo
10:10 am - 6:29 pmMEL-SEA
27h 19m2 stops
$1,034Delta
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Sun, Dec 28 - Wed, Jan 14
Delta Logo
7:35 pm - 8:40 amSEA-MEL
43h 05m2 stops
Delta Logo
10:00 am - 2:47 pmMEL-SEA
21h 47m2 stops
$1,035Delta
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Thu, Apr 2 - Sun, Apr 12
Qantas Airways Logo
12:59 pm - 9:30 amSEA-MEL
25h 31m1 stop
Qantas Airways Logo
12:00 pm - 12:29 pmMEL-SEA
19h 29m1 stop
$1,053Qantas Airways
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Sat, Jan 24 - Tue, Feb 3
Qantas Airways Logo
5:53 pm - 12:55 pmSEA-OOL
25h 02m2 stops
Qantas Airways Logo
6:00 am - 12:29 pmOOL-SEA
24h 29m2 stops
$1,252Qantas Airways
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Wed, Jan 14 - Wed, Jan 21
Alaska Airlines Logo
5:50 pm - 8:25 amSEA-CBR
44h 35m2 stops
Alaska Airlines Logo
8:20 am - 11:40 pmCBR-SEA
33h 20m2 stops
$1,428Alaska Airlines
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Sun, Mar 8 - Thu, Mar 12

ANA flights from Seattle to Australia

Our best ANA deals on Seattle to Australia flight tickets
ANA
May 5
SEA4:30 pmSeattle/Tacoma Intl
23h 55m
1 stop
SYD9:25 amSydney Kingsford Smith
May 12
SYD8:55 pmSydney Kingsford Smith
38h 41m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$901
Find similar
ANA
May 11
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
May 25
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$913
Find similar
ANA
Mar 3
SEA3:45 pmSeattle/Tacoma Intl
23h 45m
1 stop
SYD10:30 amSydney Kingsford Smith
Mar 10
SYD12:25 pmSydney Kingsford Smith
26h 33m
2 stops
SEA8:58 pmSeattle/Tacoma Intl
$919
Find similar

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets
Qantas Airways
Jan 20
SEA3:57 pmSeattle/Tacoma Intl
20h 28m
1 stop
SYD7:25 amSydney Kingsford Smith
Feb 3
SYD7:05 amSydney Kingsford Smith
24h 24m
2 stops
SEA12:29 pmSeattle/Tacoma Intl
$988
Find similar
Qantas Airways
Feb 7
SEA6:00 amSeattle/Tacoma Intl
32h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 14
SYD7:05 amSydney Kingsford Smith
28h 55m
2 stops
SEA5:00 pmSeattle/Tacoma Intl
$989
Find similar
Qantas Airways
Dec 31
SEA6:00 amSeattle/Tacoma Intl
32h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 10
SYD7:15 pmSydney Kingsford Smith
41h 50m
2 stops
SEA6:05 pmSeattle/Tacoma Intl
$1,005
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 December 2, 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

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 2/10

8:00 pm-8:45 am

1 stop18h 45m

Brisbane

Tue 2/17

10:45 am-10:06 pm

1 stop29h 21m

$791

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 2/12

3:40 pm-8:45 am

1 stop23h 05m

Brisbane

Tue 2/24

6:10 am-9:31 am

2 stops21h 21m

$809

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 2/10

8:00 pm-8:45 am

1 stop18h 45m

Brisbane

Fri 2/27

6:05 am-9:31 am

2 stops21h 26m

$815

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 4/24

5:30 pm-8:15 am

1 stop21h 45m

Melbourne

Mon 5/4

10:55 am-2:18 pm

1 stop20h 23m

$1,010

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 4/24

7:37 pm-8:15 am

1 stop19h 38m

Melbourne

Mon 5/4

10:55 am-9:12 pm

2 stops27h 17m

$1,014

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 12/28

5:25 am-8:00 am

2 stops55h 35m

Melbourne

Wed 1/14

10:10 am-6:29 pm

2 stops27h 19m

$1,034

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 4/2

7:35 pm-8:40 am

2 stops43h 05m

Melbourne

Sun 4/12

10:00 am-2:47 pm

2 stops21h 47m

$1,035

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 1/24

12:59 pm-9:30 am

1 stop25h 31m

Melbourne

Tue 2/3

12:00 pm-12:29 pm

1 stop19h 29m

$1,053

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Wed 1/14

5:53 pm-12:55 pm

2 stops25h 02m

Coolangatta Gold Coast

Wed 1/21

6:00 am-12:29 pm

2 stops24h 29m

$1,252

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Sun 3/8

5:50 pm-8:25 am

2 stops44h 35m

Canberra

Thu 3/12

8:20 am-11:40 pm

2 stops33h 20m

$1,428

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 August is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $846. If you aren’t able to travel during the month of August, then book flights to Australia from Seattle during September instead. Flights to Australia in September, while not as cheap as those in August, still average around $895.

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 $1,061 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 $877 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 21% 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

Fastest flight time

17h 58m

Direct flights

None
The fastest flight from Seattle to Australia takes 17h 58m
There are no direct flights from Seattle to Australia. There are no popular flight routes from Seattle to Australia.
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  • 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
ANAPriceFrom $583Free CancellationRating
8.4
1,016 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
11,390 reviews
Search Alaska Airlines flights
Philippine AirlinesPriceFrom $758Free CancellationRating
7.3
941 reviews
Search Philippine Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,496 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
947 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $813Free CancellationRating
7.8
2,815 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $831Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,010 reviews
Search Delta flights
Singapore AirlinesPriceFrom $1,239Free CancellationRating
8.1
1,411 reviews
Search Singapore Airlines 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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