Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Sydney from $393

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 5/12. 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.
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
8:55 pm - 2:25 pm
SYD
-
SEA
34h 30m
1 stop
$730ANA
Mon, Jun 1 - Sun, Jun 14
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
8:55 pm - 2:25 pm
SYD
-
SEA
34h 30m
1 stop
$755ANA
Mon, Jun 1 - Sun, Jun 14
American Airlines Logo
3:20 pm - 7:05 am
SEA
-
SYD
22h 45m
2 stops
American Airlines Logo
9:10 am - 1:57 pm
SYD
-
SEA
21h 47m
1 stop
$875American Airlines
Mon, Jun 1 - Mon, Jun 29
American Airlines Logo
2:57 pm - 7:05 am
SEA
-
SYD
23h 08m
2 stops
American Airlines Logo
9:10 am - 6:07 pm
SYD
-
SEA
25h 57m
1 stop
$876American Airlines
Sun, Apr 12 - Sun, Apr 26
American Airlines Logo
6:40 pm - 7:05 am
SEA
-
SYD
19h 25m
1 stop
American Airlines Logo
9:10 am - 6:07 pm
SYD
-
SEA
25h 57m
1 stop
$883American Airlines
Sun, Apr 19 - Mon, May 11
American Airlines Logo
6:40 pm - 7:05 am
SEA
-
SYD
19h 25m
1 stop
American Airlines Logo
9:10 am - 6:07 pm
SYD
-
SEA
25h 57m
1 stop
$884American Airlines
Sun, Apr 12 - Sun, Apr 26
American Airlines Logo
2:57 pm - 7:05 am
SEA
-
SYD
23h 08m
2 stops
American Airlines Logo
9:10 am - 6:07 pm
SYD
-
SEA
25h 57m
1 stop
$888American Airlines
Sun, Apr 19 - Mon, May 11
American Airlines Logo
10:00 am - 7:05 am
SEA
-
SYD
28h 05m
1 stop
American Airlines Logo
5:50 pm - 10:58 pm
SYD
-
SEA
22h 08m
1 stop
$891American Airlines
Tue, Apr 7 - Tue, Apr 21
United Airlines Logo
5:00 am - 6:55 am
SEA
-
SYD
32h 55m
1 stop
United Airlines Logo
9:30 am - 9:10 pm
SYD
-
SEA
28h 40m
2 stops
$893United Airlines
Mon, Jun 1 - Mon, Jun 29
United Airlines Logo
5:20 pm - 6:55 am
SEA
-
SYD
20h 35m
1 stop
United Airlines Logo
10:20 am - 12:34 pm
SYD
-
SEA
19h 14m
1 stop
$894United Airlines
Wed, May 27 - Mon, Jun 29

Delta flights from Seattle to Sydney

Our best Delta deals on Seattle to Sydney flight tickets
Delta
Aug 2
SEA9:30 amSeattle/Tacoma Intl
28h 20m
1 stop
SYD6:50 amSydney Kingsford Smith
Aug 19
SYD9:15 amSydney Kingsford Smith
22h 28m
1 stop
SEA2:43 pmSeattle/Tacoma Intl
$908
Delta
Aug 2
SEA2:30 pmSeattle/Tacoma Intl
23h 20m
1 stop
SYD6:50 amSydney Kingsford Smith
Aug 19
SYD9:15 amSydney Kingsford Smith
31h 46m
2 stops
SEA12:01 amSeattle/Tacoma Intl
$912
Delta
Apr 20
SEA5:59 pmSeattle/Tacoma Intl
19h 51m
1 stop
SYD6:50 amSydney Kingsford Smith
May 6
SYD9:15 amSydney Kingsford Smith
20h 10m
2 stops
SEA12:25 pmSeattle/Tacoma Intl
$918

ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets
ANA
Jun 1
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
Jun 14
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$730
ANA
Jun 1
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
Jun 14
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$755
ANA
Aug 9
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
Aug 25
SYD11:50 amSydney Kingsford Smith
28h 38m
2 stops
SEA11:28 pmSeattle/Tacoma Intl
$947

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 February 28, 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

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Sun 6/14

8:55 pm-2:25 pm

1 stop34h 30m

$730

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Sun 6/14

8:55 pm-2:25 pm

1 stop34h 30m

$755

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

3:20 pm-7:05 am

2 stops22h 45m

Sydney Kingsford Smith

Mon 6/29

9:10 am-1:57 pm

1 stop21h 47m

$875

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/12

2:57 pm-7:05 am

2 stops23h 08m

Sydney Kingsford Smith

Sun 4/26

9:10 am-6:07 pm

1 stop25h 57m

$876

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Mon 5/11

9:10 am-6:07 pm

1 stop25h 57m

$883

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/12

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Sun 4/26

9:10 am-6:07 pm

1 stop25h 57m

$884

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

2:57 pm-7:05 am

2 stops23h 08m

Sydney Kingsford Smith

Mon 5/11

9:10 am-6:07 pm

1 stop25h 57m

$888

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/7

10:00 am-7:05 am

1 stop28h 05m

Sydney Kingsford Smith

Tue 4/21

5:50 pm-10:58 pm

1 stop22h 08m

$891

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

5:00 am-6:55 am

1 stop32h 55m

Sydney Kingsford Smith

Mon 6/29

9:30 am-9:10 pm

2 stops28h 40m

$893

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/27

5:20 pm-6:55 am

1 stop20h 35m

Sydney Kingsford Smith

Mon 6/29

10:20 am-12:34 pm

1 stop19h 14m

$894

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 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 $845. 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 $848.

How far in advance should I book a flight 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 $1,066 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 $876 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of February 2026, prices for Seattle to Sydney flights are approximately 29% 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 45m

Direct flights

None
The fastest flight from Seattle to Sydney takes 17h 45m
There are no direct flights from Seattle to Sydney. There are no popular flight routes from Seattle to Sydney.
Search flight deals

  • 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 45m.

  • 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
8.4
1,107 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
11,970 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,760 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $786Free CancellationRating
7.5
999 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.1
11,372 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $812Free CancellationRating
7.8
2,837 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $833Free CancellationRating
7.4
9,366 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,244 reviews
Search Delta flights
Alaska AirlinesPriceFrom $1,126Free 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
Katoomba
Parramatta
Wollongong
Penrith
Coogee
Manly
Randwick
Lithgow
Leura
Cronulla
Charlestown
Terrigal
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
Mon 3/30
Mon 4/6
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia