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Cheap flights from Seattle to Sydney from $391

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 4/9. 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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Find the cheapest flights from Seattle to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:50 pm - 12:35 pm
SEA
-
SYD
29h 45m
2 stops
Multiple Airlines Logo
2:00 pm - 11:40 pm
SYD
-
SEA
27h 40m
2 stops
$1,062Multiple Airlines
Fri, Mar 13 - Sun, Mar 22
Multiple Airlines Logo
8:00 pm - 7:20 am
SEA
-
SYD
18h 20m
1 stop
Multiple Airlines Logo
6:00 am - 9:15 am
SYD
-
SEA
20h 15m
2 stops
$1,064Multiple Airlines
Sun, Apr 19 - Mon, May 11
Multiple Airlines Logo
7:20 pm - 7:20 am
SEA
-
SYD
19h 00m
1 stop
Multiple Airlines Logo
6:00 am - 9:17 am
SYD
-
SEA
20h 17m
2 stops
$1,065Multiple Airlines
Mon, Jun 1 - Mon, Jun 29
Multiple Airlines Logo
3:50 pm - 12:35 pm
SEA
-
SYD
25h 45m
2 stops
Multiple Airlines Logo
6:00 am - 6:57 pm
SYD
-
SEA
30h 57m
2 stops
$1,066Multiple Airlines
Tue, Feb 17 - Tue, Mar 10
Qantas Airways Logo
5:53 pm - 5:40 pm
SEA
-
SYD
28h 47m
2 stops
Qantas Airways Logo
11:20 am - 6:58 pm
SYD
-
SEA
26h 38m
1 stop
$1,067Qantas Airways
Mon, Feb 2 - Wed, Feb 18
Multiple Airlines Logo
5:59 pm - 11:45 am
SEA
-
SYD
24h 46m
2 stops
Multiple Airlines Logo
6:00 am - 6:56 pm
SYD
-
SEA
29h 56m
2 stops
$1,068Multiple Airlines
Sun, Apr 19 - Thu, May 14
Air Canada Logo
3:40 pm - 9:35 am
SEA
-
SYD
22h 55m
1 stop
Air Canada Logo
8:00 am - 2:01 pm
SYD
-
SEA
25h 01m
2 stops
$1,069Air Canada
Wed, Feb 25 - Sun, Mar 8
Multiple Airlines Logo
9:55 am - 9:35 am
SEA
-
SYD
28h 40m
1 stop
Multiple Airlines Logo
9:20 pm - 9:31 am
SYD
-
SEA
30h 11m
2 stops
$1,070Multiple Airlines
Tue, Feb 17 - Tue, Mar 10
Multiple Airlines Logo
3:57 pm - 12:35 pm
SEA
-
SYD
25h 38m
2 stops
Multiple Airlines Logo
2:00 pm - 7:58 pm
SYD
-
SEA
23h 58m
2 stops
$1,071Multiple Airlines
Tue, Feb 10 - Tue, Mar 10
Air New Zealand Logo
3:40 pm - 7:20 am
SEA
-
SYD
22h 40m
1 stop
Air New Zealand Logo
9:20 am - 9:33 am
SYD
-
SEA
17h 13m
1 stop
$1,072Air New Zealand
Sun, Apr 5 - Mon, Apr 20

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
Feb 8
SEA3:40 pmSeattle/Tacoma Intl
22h 55m
1 stop
SYD9:35 amSydney Kingsford Smith
Feb 23
SYD9:00 amSydney Kingsford Smith
24h 31m
2 stops
SEA2:31 pmSeattle/Tacoma Intl
$1,068
Air Canada
Feb 25
SEA3:40 pmSeattle/Tacoma Intl
22h 55m
1 stop
SYD9:35 amSydney Kingsford Smith
Mar 8
SYD8:00 amSydney Kingsford Smith
25h 01m
2 stops
SEA2:01 pmSeattle/Tacoma Intl
$1,069
Air Canada
Feb 8
SEA8:00 pmSeattle/Tacoma Intl
23h 40m
2 stops
SYD2:40 pmSydney Kingsford Smith
Feb 23
SYD11:20 amSydney Kingsford Smith
22h 11m
1 stop
SEA2:31 pmSeattle/Tacoma Intl
$1,075

Qantas Airways flights from Seattle to Sydney

Our best Qantas Airways deals on Seattle to Sydney flight tickets
Qantas Airways
Feb 2
SEA5:53 pmSeattle/Tacoma Intl
28h 47m
2 stops
SYD5:40 pmSydney Kingsford Smith
Feb 18
SYD11:20 amSydney Kingsford Smith
26h 38m
1 stop
SEA6:58 pmSeattle/Tacoma Intl
$1,067
Qantas Airways
Feb 2
SEA5:53 pmSeattle/Tacoma Intl
28h 47m
2 stops
SYD5:40 pmSydney Kingsford Smith
Feb 15
SYD11:20 amSydney Kingsford Smith
26h 38m
1 stop
SEA6:58 pmSeattle/Tacoma Intl
$1,077
Qantas Airways
Feb 7
SEA6:00 amSeattle/Tacoma Intl
32h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 24
SYD7:05 amSydney Kingsford Smith
30h 53m
2 stops
SEA6:58 pmSeattle/Tacoma Intl
$1,098

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 January 14, 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

Fri 3/13

12:50 pm-12:35 pm

2 stops29h 45m

Sydney Kingsford Smith

Sun 3/22

2:00 pm-11:40 pm

2 stops27h 40m

$1,062

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

8:00 pm-7:20 am

1 stop18h 20m

Sydney Kingsford Smith

Mon 5/11

6:00 am-9:15 am

2 stops20h 15m

$1,064

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

7:20 pm-7:20 am

1 stop19h 00m

Sydney Kingsford Smith

Mon 6/29

6:00 am-9:17 am

2 stops20h 17m

$1,065

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/17

3:50 pm-12:35 pm

2 stops25h 45m

Sydney Kingsford Smith

Tue 3/10

6:00 am-6:57 pm

2 stops30h 57m

$1,066

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 2/2

5:53 pm-5:40 pm

2 stops28h 47m

Sydney Kingsford Smith

Wed 2/18

11:20 am-6:58 pm

1 stop26h 38m

$1,067

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

5:59 pm-11:45 am

2 stops24h 46m

Sydney Kingsford Smith

Thu 5/14

6:00 am-6:56 pm

2 stops29h 56m

$1,068

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/25

3:40 pm-9:35 am

1 stop22h 55m

Sydney Kingsford Smith

Sun 3/8

8:00 am-2:01 pm

2 stops25h 01m

$1,069

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/17

9:55 am-9:35 am

1 stop28h 40m

Sydney Kingsford Smith

Tue 3/10

9:20 pm-9:31 am

2 stops30h 11m

$1,070

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/10

3:57 pm-12:35 pm

2 stops25h 38m

Sydney Kingsford Smith

Tue 3/10

2:00 pm-7:58 pm

2 stops23h 58m

$1,071

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/5

3:40 pm-7:20 am

1 stop22h 40m

Sydney Kingsford Smith

Mon 4/20

9:20 am-9:33 am

1 stop17h 13m

$1,072

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?

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 $846. If you are unable to visit Sydney during the month of August, then departing from Seattle during the month September is also very affordable. Most momondo users find prices during this month for around $860.

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 $1,055 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 January 2026, prices for Seattle to Sydney flights are approximately 33% 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 40m

Direct flights

None
The fastest flight from Seattle to Sydney takes 17h 40m
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 40m.

  • 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
1,069 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
7.9
11,701 reviews
Search Alaska Airlines flights
Philippine AirlinesPriceFrom $758Free CancellationRating
7.3
954 reviews
Search Philippine Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,619 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
970 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
11,120 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $812Free CancellationRating
7.8
2,827 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $830Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,040 reviews
Search Delta flights

Traveling to a place near Sydney?

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

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