Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Sydney from $530

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 8/11. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
7:20 pm - 7:20 am
SEA
-
SYD
19h 00m
1 stop
Air Canada Logo
9:20 am - 2:22 pm
SYD
-
SEA
22h 02m
1 stop
$1,045Air Canada
Tue, Jul 28 - Tue, Aug 11
Air Canada Logo
5:45 am - 7:20 am
SEA
-
SYD
32h 35m
1 stop
Air Canada Logo
9:20 am - 10:07 am
SYD
-
SEA
17h 47m
1 stop
$1,046Air Canada
Sun, Jul 5 - Sun, Jul 12
Air Canada Logo
5:45 am - 7:20 am
SEA
-
SYD
32h 35m
1 stop
Air Canada Logo
9:20 am - 10:07 am
SYD
-
SEA
17h 47m
1 stop
$1,047Air Canada
Sun, Jul 5 - Sun, Jul 12
Air Canada Logo
3:00 pm - 7:20 am
SEA
-
SYD
23h 20m
1 stop
Air Canada Logo
9:20 am - 10:40 pm
SYD
-
SEA
30h 20m
1 stop
$1,055Air Canada
Sun, Jun 7 - Sun, Jun 14
Air Canada Logo
5:45 am - 7:20 am
SEA
-
SYD
32h 35m
1 stop
Air Canada Logo
9:20 am - 6:32 pm
SYD
-
SEA
26h 12m
1 stop
$1,056Air Canada
Sun, Jul 26 - Tue, Aug 11
Air Canada Logo
8:40 am - 8:35 am
SEA
-
SYD
29h 55m
1 stop
Air Canada Logo
11:20 am - 9:17 am
SYD
-
SEA
16h 57m
1 stop
$1,058Air Canada
Sun, Oct 25 - Tue, Nov 3
Multiple Airlines Logo
5:45 am - 7:20 am
SEA
-
SYD
32h 35m
1 stop
Multiple Airlines Logo
9:20 am - 10:40 pm
SYD
-
SEA
30h 20m
1 stop
$1,062Multiple Airlines
Mon, Jun 8 - Sun, Jun 14
Multiple Airlines Logo
7:20 pm - 7:20 am
SEA
-
SYD
19h 00m
1 stop
Multiple Airlines Logo
6:00 am - 10:07 am
SYD
-
SEA
21h 07m
2 stops
$1,065Multiple Airlines
Tue, Jul 28 - Tue, Aug 11
Air Canada Logo
7:20 pm - 7:20 am
SEA
-
SYD
19h 00m
1 stop
Air Canada Logo
6:30 am - 6:32 pm
SYD
-
SEA
29h 02m
2 stops
$1,071Air Canada
Sun, Jun 14 - Mon, Jul 6
Air Canada Logo
5:45 am - 7:20 am
SEA
-
SYD
32h 35m
1 stop
Air Canada Logo
7:00 am - 10:07 am
SYD
-
SEA
20h 07m
2 stops
$1,072Air Canada
Sun, Jul 26 - Tue, Aug 11

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
Jul 28
SEA7:20 pmSeattle/Tacoma Intl
19h 00m
1 stop
SYD7:20 amSydney Kingsford Smith
Aug 11
SYD9:20 amSydney Kingsford Smith
22h 02m
1 stop
SEA2:22 pmSeattle/Tacoma Intl
$1,045
Air Canada
Jul 5
SEA5:45 amSeattle/Tacoma Intl
32h 35m
1 stop
SYD7:20 amSydney Kingsford Smith
Jul 12
SYD9:20 amSydney Kingsford Smith
17h 47m
1 stop
SEA10:07 amSeattle/Tacoma Intl
$1,046
Air Canada
Jul 5
SEA5:45 amSeattle/Tacoma Intl
32h 35m
1 stop
SYD7:20 amSydney Kingsford Smith
Jul 12
SYD9:20 amSydney Kingsford Smith
17h 47m
1 stop
SEA10:07 amSeattle/Tacoma Intl
$1,047

Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets
Alaska Airlines
Jul 27
SEA8:00 amSeattle/Tacoma Intl
17h 50m
1 stop
SYD6:50 pmSydney Kingsford Smith
Aug 11
SYD8:45 pmSydney Kingsford Smith
17h 49m
1 stop
SEA9:34 pmSeattle/Tacoma Intl
$1,125
Alaska Airlines
Jun 1
SEA7:35 amSeattle/Tacoma Intl
18h 15m
1 stop
SYD6:50 pmSydney Kingsford Smith
Jun 14
SYD8:45 pmSydney Kingsford Smith
17h 49m
1 stop
SEA9:34 pmSeattle/Tacoma Intl
$1,138
Alaska Airlines
Jun 2
SEA8:50 pmSeattle/Tacoma Intl
29h 00m
1 stop
SYD6:50 pmSydney Kingsford Smith
Jun 16
SYD8:45 pmSydney Kingsford Smith
17h 49m
1 stop
SEA9:34 pmSeattle/Tacoma Intl
$1,146

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 May 27, 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 - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

7:20 pm-7:20 am

1 stop19h 00m

Sydney Kingsford Smith

Tue 8/11

9:20 am-2:22 pm

1 stop22h 02m

$1,045

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/5

5:45 am-7:20 am

1 stop32h 35m

Sydney Kingsford Smith

Sun 7/12

9:20 am-10:07 am

1 stop17h 47m

$1,046

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/5

5:45 am-7:20 am

1 stop32h 35m

Sydney Kingsford Smith

Sun 7/12

9:20 am-10:07 am

1 stop17h 47m

$1,047

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 6/7

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 6/14

9:20 am-10:40 pm

1 stop30h 20m

$1,055

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/26

5:45 am-7:20 am

1 stop32h 35m

Sydney Kingsford Smith

Tue 8/11

9:20 am-6:32 pm

1 stop26h 12m

$1,056

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 10/25

8:40 am-8:35 am

1 stop29h 55m

Sydney Kingsford Smith

Tue 11/3

11:20 am-9:17 am

1 stop16h 57m

$1,058

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/8

5:45 am-7:20 am

1 stop32h 35m

Sydney Kingsford Smith

Sun 6/14

9:20 am-10:40 pm

1 stop30h 20m

$1,062
Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

7:20 pm-7:20 am

1 stop19h 00m

Sydney Kingsford Smith

Tue 8/11

6:00 am-10:07 am

2 stops21h 07m

$1,065

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 6/14

7:20 pm-7:20 am

1 stop19h 00m

Sydney Kingsford Smith

Mon 7/6

6:30 am-6:32 pm

2 stops29h 02m

$1,071

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/26

5:45 am-7:20 am

1 stop32h 35m

Sydney Kingsford Smith

Tue 8/11

7:00 am-10:07 am

2 stops20h 07m

$1,072

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

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 $792. 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 $846.

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 $1,048 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 $900 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of May 2026, prices for Seattle to Sydney flights are approximately 12% 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

17h 50m

Direct flights

None
The fastest flight from Seattle to Sydney takes 17h 50m
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 17h 50m.

  • 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
1,215 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
7.9
12,419 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom $778Free CancellationRating
7.1
11,091 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
1,042 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.1
11,640 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $813Free CancellationRating
7.8
2,835 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $831Free CancellationRating
7.4
9,753 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,425 reviews
Search Delta flights
Alaska AirlinesPriceFrom $1,158Free CancellationRating
0.0
Search Alaska Airlines flights

Traveling to a place near Sydney?

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

An easier way to manage your Sydney 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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 6/26
Fri 7/3
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia