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Cheap flights from Seattle to Sydney from $525

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 Sydney departing on 11/18. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
3:15 pm - 9:35 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
23h 20m1 stop Vancouver Intl
Air Canada Logo
11:20 am - 6:22 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
26h 02m1 stop Vancouver Intl
$938Air Canada
Wed, Nov 11 - Mon, Nov 30
Air Canada Logo
3:00 pm - 7:20 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
23h 20m1 stop Vancouver Intl
Air Canada Logo
9:20 am - 2:22 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
22h 02m1 stop Vancouver Intl
$938Air Canada
Tue, Sep 8 - Mon, Sep 14
Multiple Airlines Logo
7:57 pm - 8:35 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
18h 38m1 stop Vancouver Intl
Multiple Airlines Logo
11:20 am - 9:27 amSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
17h 07m1 stop Vancouver Intl
$948Multiple Airlines
Sun, Oct 25 - Wed, Nov 25
Multiple Airlines Logo
7:05 pm - 8:35 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
19h 30m1 stop Vancouver Intl
Multiple Airlines Logo
11:20 am - 12:56 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
20h 36m1 stop Vancouver Intl
$948Multiple Airlines
Sun, Oct 25 - Mon, Nov 23
Air New Zealand Logo
3:15 pm - 9:35 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
23h 20m1 stop Vancouver Intl
Air New Zealand Logo
11:20 am - 2:37 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
22h 17m1 stop Vancouver Intl
$1,035Air New Zealand
Wed, Nov 25 - Thu, Jan 14
Air New Zealand Logo
3:15 pm - 9:35 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
23h 20m1 stop Vancouver Intl
Air New Zealand Logo
4:00 pm - 2:37 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
17h 37m1 stop Vancouver Intl
$1,035Air New Zealand
Tue, Nov 24 - Thu, Jan 14
American Airlines Logo
11:40 am - 7:05 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
26h 25m1 stop Los Angeles
American Airlines Logo
12:00 pm - 4:41 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
21h 41m1 stop Dallas/Fort Worth
$1,036American Airlines
Wed, Aug 19 - Wed, Aug 26
United Airlines Logo
10:55 am - 6:55 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
27h 00m1 stop San Francisco
United Airlines Logo
10:20 am - 2:24 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
21h 04m1 stop San Francisco
$1,040United Airlines
Mon, Aug 31 - Mon, Sep 7
United Airlines Logo
9:05 am - 6:55 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
28h 50m1 stop San Francisco
United Airlines Logo
10:20 am - 8:43 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
27h 23m1 stop San Francisco
$1,040United Airlines
Wed, Aug 19 - Mon, Sep 7
American Airlines Logo
11:22 am - 7:05 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
26h 43m2 stops Phoenix Sky Harbor Intl Los Angeles
American Airlines Logo
9:10 am - 4:42 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
24h 32m2 stops Los Angeles Dallas/Fort Worth
$1,081American Airlines
Wed, Sep 9 - Wed, Sep 16

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Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
Sep 14
SEA10:50 amSeattle/Tacoma Intl
27h 30m
1 stop
SYD7:20 amSydney Kingsford Smith
Sep 22
SYD9:20 amSydney Kingsford Smith
22h 02m
1 stop
SEA2:22 pmSeattle/Tacoma Intl
$932
Air Canada
Nov 11
SEA3:15 pmSeattle/Tacoma Intl
23h 20m
1 stop
SYD9:35 amSydney Kingsford Smith
Nov 30
SYD11:20 amSydney Kingsford Smith
26h 02m
1 stop
SEA6:22 pmSeattle/Tacoma Intl
$938
Air Canada
Nov 11
SEA3:15 pmSeattle/Tacoma Intl
23h 20m
1 stop
SYD9:35 amSydney Kingsford Smith
Nov 30
SYD11:20 amSydney Kingsford Smith
26h 02m
1 stop
SEA6:22 pmSeattle/Tacoma Intl
$939

American Airlines flights from Seattle to Sydney

Our best American Airlines deals on Seattle to Sydney flight tickets
American Airlines
Aug 19
SEA11:40 amSeattle/Tacoma Intl
26h 25m
1 stop
SYD7:05 amSydney Kingsford Smith
Aug 26
SYD12:00 pmSydney Kingsford Smith
21h 41m
1 stop
SEA4:41 pmSeattle/Tacoma Intl
$1,036
American Airlines
Aug 21
SEA11:40 amSeattle/Tacoma Intl
26h 50m
1 stop
SYD7:30 amSydney Kingsford Smith
Aug 29
SYD9:10 amSydney Kingsford Smith
24h 42m
1 stop
SEA4:52 pmSeattle/Tacoma Intl
$1,136

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Sydney 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 August 9, 2026.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/11

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 11/30

11:20 am-6:22 pm

1 stop26h 02m

$938

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 9/8

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 9/14

9:20 am-2:22 pm

1 stop22h 02m

$938
Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/25

7:57 pm-8:35 am

1 stop18h 38m

Sydney Kingsford Smith

Wed 11/25

11:20 am-9:27 am

1 stop17h 07m

$948

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/25

7:05 pm-8:35 am

1 stop19h 30m

Sydney Kingsford Smith

Mon 11/23

11:20 am-12:56 pm

1 stop20h 36m

$948

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/25

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Thu 1/14

11:20 am-2:37 pm

1 stop22h 17m

$1,035

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 11/24

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Thu 1/14

4:00 pm-2:37 pm

1 stop17h 37m

$1,035

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 8/19

11:40 am-7:05 am

1 stop26h 25m

Sydney Kingsford Smith

Wed 8/26

12:00 pm-4:41 pm

1 stop21h 41m

$1,036

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 8/31

10:55 am-6:55 am

1 stop27h 00m

Sydney Kingsford Smith

Mon 9/7

10:20 am-2:24 pm

1 stop21h 04m

$1,040

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 8/19

9:05 am-6:55 am

1 stop28h 50m

Sydney Kingsford Smith

Mon 9/7

10:20 am-8:43 pm

1 stop27h 23m

$1,040

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 9/9

11:22 am-7:05 am

2 stops26h 43m

Sydney Kingsford Smith

Wed 9/16

9:10 am-4:42 pm

2 stops24h 32m

$1,081

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 Sydney from

How to get the cheapest flight ticket from Seattle to Sydney

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 typical price of a round-trip flight between Seattle and Sydney?

Prices are currently typical for flights on this route.

Typical prices usually range from $615 to $1,120.
The lowest price recently found on this route was $932.

What is the cheapest month to fly to Sydney?

In general, August is the cheapest month to fly from Seattle to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $796. If you are unable to visit Sydney during the month of August, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $842.

How far in advance should I book a flight from Seattle to Sydney?

You are more likely to see cheaper flights to Sydney from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,108 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Seattle for as low as $927 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of August 2026, prices for Seattle to Sydney flights are approximately 27% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Sydney (SEA to SYD) flight deals and tips

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

Fastest flight time

19h 00m

Direct flights

None
The fastest flight from Seattle to Sydney takes 19h 00m
There are no direct flights from Seattle to Sydney. There are no popular flight routes from Seattle to Sydney.
Search flight deals

Frequently asked questions about flying from Seattle to Sydney

  • How far is Seattle/Tacoma Intl to Sydney Kingsford Smith by plane?

    Sydney Kingsford Smith is 7743.7 mi away from Seattle/Tacoma Intl. In terms of flight time, this usually takes a little over 19h 00m.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Seattle to Sydney?

Best airlines flying from Seattle to Sydney

Compare and see reviews for airlines that fly from Seattle to Sydney with momondo
Airline
Rating
Free Cancellation
Price
ANAPriceFrom $583Free CancellationRating
8.3
1,293 reviews
Search ANA flights
Air CanadaPriceFrom $778Free CancellationRating
7.1
11,455 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $803Free CancellationRating
7.5
1,079 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.1
11,894 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $812Free CancellationRating
7.8
2,818 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $827Free CancellationRating
7.9
12,786 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $841Free CancellationRating
7.4
10,089 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.8
8,500 reviews
Search Delta flights
Air New ZealandPriceFrom $947Free CancellationRating
8.0
659 reviews
Search Air New Zealand flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Bondi Beach
Wollongong
Penrith
Katoomba
Leura
Cronulla
Randwick
Manly
Lithgow
Coogee
Terrigal
Charlestown
Swansea

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Sydney. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Sydney from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Seattle.

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

Yes. momondo can track prices for Seattle to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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