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Cheap flights from Seattle to Sydney from $491

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
3:00 pm - 8:20 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
23h 20m1 stop Vancouver Intl
Air Canada Logo
10:20 am - 2:37 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
22h 17m1 stop Vancouver Intl
$848Air Canada
Tue, Oct 20 - Tue, Oct 27
Air Canada Logo
3:00 pm - 8:20 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
23h 20m1 stop Vancouver Intl
Air Canada Logo
10:20 am - 2:37 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
22h 17m1 stop Vancouver Intl
$849Air Canada
Tue, Oct 20 - Tue, Oct 27
Multiple Airlines Logo
8:09 pm - 6:25 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
39h 16m1 stop Los Angeles
Multiple Airlines Logo
2:00 pm - 6:54 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
23h 54m2 stops Nadi Los Angeles
$860Multiple Airlines
Sat, Nov 7 - Tue, Nov 10
Multiple Airlines Logo
7:15 pm - 8:20 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
19h 05m1 stop Vancouver Intl
Multiple Airlines Logo
8:00 am - 10:32 amSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
20h 32m2 stops Brisbane Vancouver Intl
$899Multiple Airlines
Sun, Oct 18 - Sun, Nov 1
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 - 9:15 amSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
16h 55m1 stop Vancouver Intl
$996Air New Zealand
Tue, Feb 2 - Tue, Mar 2
Air New Zealand Logo
10:10 am - 9:35 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
28h 25m1 stop Vancouver Intl
Air New Zealand Logo
11:20 am - 9:15 amSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
16h 55m1 stop Vancouver Intl
$996Air New Zealand
Mon, Feb 1 - Mon, Mar 1
Qantas Airways Logo
5:55 pm - 9:00 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
20h 05m1 stop Los Angeles
Qantas Airways Logo
11:20 am - 2:42 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
22h 22m1 stop Los Angeles
$1,054Qantas Airways
Wed, Feb 17 - Wed, Mar 3
Qantas Airways Logo
4:45 pm - 6:25 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
18h 40m1 stop San Francisco
Qantas Airways Logo
11:20 am - 2:42 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
22h 22m1 stop Los Angeles
$1,057Qantas Airways
Wed, Feb 17 - Wed, Mar 3
American Airlines Logo
1:37 pm - 9:15 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
25h 38m2 stops Los Angeles Brisbane
American Airlines Logo
11:10 am - 7:44 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
26h 34m2 stops Los Angeles Dallas/Fort Worth
$1,072American Airlines
Tue, Oct 20 - Tue, Oct 27
American Airlines Logo
3:30 pm - 7:30 amSEA  Seattle/Tacoma Intl-SYD Sydney Kingsford Smith
22h 00m2 stops Phoenix Sky Harbor Intl Los Angeles
American Airlines Logo
11:10 am - 3:09 pmSYD  Sydney Kingsford Smith-SEA Seattle/Tacoma Intl
21h 59m2 stops Los Angeles Sacramento Intl
$1,093American Airlines
Tue, Oct 20 - Tue, Oct 27

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Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
Oct 20
SEA3:00 pmSeattle/Tacoma Intl
23h 20m
1 stop
SYD8:20 amSydney Kingsford Smith
Oct 27
SYD10:20 amSydney Kingsford Smith
22h 17m
1 stop
SEA2:37 pmSeattle/Tacoma Intl
$848
Air Canada
Oct 20
SEA3:00 pmSeattle/Tacoma Intl
23h 20m
1 stop
SYD8:20 amSydney Kingsford Smith
Oct 27
SYD10:20 amSydney Kingsford Smith
22h 17m
1 stop
SEA2:37 pmSeattle/Tacoma Intl
$849
Air Canada
Oct 20
SEA3:00 pmSeattle/Tacoma Intl
23h 20m
1 stop
SYD8:20 amSydney Kingsford Smith
Oct 27
SYD10:20 amSydney Kingsford Smith
22h 17m
1 stop
SEA2:37 pmSeattle/Tacoma Intl
$851

Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets
Alaska Airlines
Sep 21
SEA7:20 amSeattle/Tacoma Intl
18h 30m
1 stop
SYD6:50 pmSydney Kingsford Smith
Oct 3
SYD8:45 pmSydney Kingsford Smith
17h 49m
1 stop
SEA9:34 pmSeattle/Tacoma Intl
$1,200
Alaska Airlines
Sep 11
SEA7:20 amSeattle/Tacoma Intl
18h 30m
1 stop
SYD6:50 pmSydney Kingsford Smith
Sep 13
SYD8:45 pmSydney Kingsford Smith
17h 44m
1 stop
SEA9:29 pmSeattle/Tacoma Intl
$1,202
Alaska Airlines
Sep 20
SEA1:30 pmSeattle/Tacoma Intl
36h 20m
1 stop
SYD6:50 pmSydney Kingsford Smith
Oct 3
SYD8:45 pmSydney Kingsford Smith
17h 49m
1 stop
SEA9:34 pmSeattle/Tacoma Intl
$1,218

momondo Fare Finder

 
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

3:00 pm-8:20 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 10/27

10:20 am-2:37 pm

1 stop22h 17m

$848

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

3:00 pm-8:20 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 10/27

10:20 am-2:37 pm

1 stop22h 17m

$849

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 11/7

8:09 pm-6:25 am

1 stop39h 16m

Sydney Kingsford Smith

Tue 11/10

2:00 pm-6:54 pm

2 stops23h 54m

$860
Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

7:15 pm-8:20 am

1 stop19h 05m

Sydney Kingsford Smith

Sun 11/1

8:00 am-10:32 am

2 stops20h 32m

$899

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 2/2

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 3/2

11:20 am-9:15 am

1 stop16h 55m

$996

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/1

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Mon 3/1

11:20 am-9:15 am

1 stop16h 55m

$996

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/17

5:55 pm-9:00 am

1 stop20h 05m

Sydney Kingsford Smith

Wed 3/3

11:20 am-2:42 pm

1 stop22h 22m

$1,054

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/17

4:45 pm-6:25 am

1 stop18h 40m

Sydney Kingsford Smith

Wed 3/3

11:20 am-2:42 pm

1 stop22h 22m

$1,057

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

1:37 pm-9:15 am

2 stops25h 38m

Sydney Kingsford Smith

Tue 10/27

11:10 am-7:44 pm

2 stops26h 34m

$1,072

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

3:30 pm-7:30 am

2 stops22h 00m

Sydney Kingsford Smith

Tue 10/27

11:10 am-3:09 pm

2 stops21h 59m

$1,093

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 low for flights on this route.

Typical prices usually range from $990 to $1,083.
The lowest price recently found on this route was $848.

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 $804. 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 $938.

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 $1,140 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 $955 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of September 2026, prices for Seattle to Sydney flights are approximately 18% 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

Best Price Found

$491

Fastest flight time

18h 30m

Direct flights

None
The best one-way flight to Sydney from Seattle in the past 72 hours is $491. The best round-trip flight deal from Seattle to Sydney found on momondo in the last 72 hours is $848.
The fastest flight from Seattle to Sydney takes 18h 30m
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 18h 30m.

  • 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
1,312 reviews
Search ANA flights
Air CanadaPriceFrom $780Free CancellationRating
7.1
11,608 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $803Free CancellationRating
7.5
1,091 reviews
Search Qantas Airways flights
Hawaiian AirlinesPriceFrom $812Free CancellationRating
7.8
2,814 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $828Free CancellationRating
7.9
12,904 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $843Free CancellationRating
7.4
10,194 reviews
Search United Airlines flights
DeltaPriceFrom $843Free CancellationRating
7.8
8,553 reviews
Search Delta flights
Air New ZealandPriceFrom $947Free CancellationRating
8.0
669 reviews
Search Air New Zealand flights
American AirlinesPriceFrom $976Free CancellationRating
7.1
12,047 reviews
Search American Airlines 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
Coogee
Cronulla
Leura
Randwick
Manly
Terrigal
Lithgow
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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