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Cheap flights from Seattle to Sydney from $468

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 6/21. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Sydney.
 Logo
12:04 pm - 2:40 pmSEA-SYD
33h 36m2 stops
 Logo
4:20 pm - 11:24 pmSYD-SEA
24h 04m1 stop
Πεμ, Ιουν 5 - Πεμ, Ιουν 12
 Logo
10:18 am - 2:40 pmSEA-SYD
35h 22m2 stops
 Logo
4:20 pm - 11:24 pmSYD-SEA
24h 04m1 stop
Πεμ, Ιουν 5 - Πεμ, Ιουν 12
United Airlines Logo
5:14 pm - 7:00 amSEA-SYD
20h 46m1 stop
United Airlines Logo
9:30 am - 2:38 pmSYD-SEA
22h 08m1 stop
$974United Airlines
Find Deal
Κυρ, Ιουν 1 - Σαβ, Ιουν 14
United Airlines Logo
5:14 pm - 7:00 amSEA-SYD
20h 46m1 stop
United Airlines Logo
9:30 am - 2:38 pmSYD-SEA
22h 08m1 stop
$982United Airlines
Find Deal
Κυρ, Ιουν 1 - Σαβ, Ιουν 14
Delta Logo
12:20 pm - 6:35 amSEA-SYD
25h 15m1 stop
Delta Logo
9:25 am - 8:22 pmSYD-SEA
27h 57m1 stop
$992Delta
Find Deal
Τετ, Ιουν 18 - Πεμ, Ιουλ 10
Air Canada Logo
1:45 pm - 7:20 amSEA-SYD
24h 35m1 stop
Air Canada Logo
9:20 am - 9:18 amSYD-SEA
16h 58m1 stop
$993Air Canada
Find Deal
Πεμ, Ιουν 5 - Πεμ, Ιουν 12
Delta Logo
5:30 am - 6:35 amSEA-SYD
32h 05m2 stops
Delta Logo
9:25 am - 4:47 pmSYD-SEA
24h 22m2 stops
$996Delta
Find Deal
Πεμ, Ιουν 12 - Τρι, Ιουν 24
Hawaiian Airlines Logo
8:25 am - 7:45 pmSEA-SYD
18h 20m1 stop
Hawaiian Airlines Logo
9:40 pm - 6:00 amSYD-SEA
25h 20m1 stop
$1,139Hawaiian Airlines
Find Deal
Παρ, Ιουν 6 - Παρ, Ιουν 13
Hawaiian Airlines Logo
8:15 am - 7:45 pmSEA-SYD
18h 30m1 stop
Hawaiian Airlines Logo
9:40 pm - 9:44 pmSYD-SEA
17h 04m1 stop
$1,152Hawaiian Airlines
Find Deal
Πεμ, Αυγ 28 - Τρι, Σεπ 2
Air Canada Logo
1:45 pm - 8:20 amSEA-SYD
24h 35m1 stop
Air Canada Logo
8:00 am - 9:16 amSYD-SEA
19h 16m2 stops
$1,160Air Canada
Find Deal
Κυρ, Οκτ 19 - Κυρ, Οκτ 26

Hawaiian Airlines flights from Seattle to Sydney

Our best Hawaiian Airlines deals on Seattle to Sydney flight tickets
Hawaiian Airlines
May 2
SEA6:50 pmSeattle/Tacoma Intl
31h 55m
1 stop
SYD7:45 pmSydney Kingsford Smith
May 15
SYD9:40 pmSydney Kingsford Smith
17h 20m
1 stop
SEA10:00 pmSeattle/Tacoma Intl
Hawaiian Airlines
Jun 6
SEA8:25 amSeattle/Tacoma Intl
18h 20m
1 stop
SYD7:45 pmSydney Kingsford Smith
Jun 13
SYD9:40 pmSydney Kingsford Smith
25h 20m
1 stop
SEA6:00 amSeattle/Tacoma Intl
Hawaiian Airlines
May 2
SEA10:10 amSeattle/Tacoma Intl
40h 35m
2 stops
SYD7:45 pmSydney Kingsford Smith
May 15
SYD9:40 pmSydney Kingsford Smith
25h 35m
1 stop
SEA6:15 amSeattle/Tacoma Intl

Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets
Alaska Airlines
Aug 29
SEA8:15 amSeattle/Tacoma Intl
18h 30m
1 stop
SYD7:45 pmSydney Kingsford Smith
Sep 7
SYD9:40 pmSydney Kingsford Smith
26h 35m
2 stops
SEA7:15 amSeattle/Tacoma Intl
Alaska Airlines
Aug 28
SEA5:23 amSeattle/Tacoma Intl
21h 22m
2 stops
SYD7:45 pmSydney Kingsford Smith
Sep 7
SYD9:40 pmSydney Kingsford Smith
26h 35m
2 stops
SEA7:15 amSeattle/Tacoma Intl
Alaska Airlines
Aug 20
SEA5:23 amSeattle/Tacoma Intl
21h 22m
2 stops
SYD7:45 pmSydney Kingsford Smith
Aug 24
SYD9:40 pmSydney Kingsford Smith
25h 55m
2 stops
SEA6:35 amSeattle/Tacoma Intl

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, March 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 $1,030. If you are unable to visit Sydney during the month of March, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $1,043.

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Seattle to Sydney is on a Tuesday when prices can be found for as low as $1,078. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,156.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the evening. momondo users have found flights departing from Seattle to Sydney in the evening for as low as $1,078. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the morning, with an average ticket price of $1,152. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 24 weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,141 when searching 24 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 $1,026 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of April 2025, prices for Seattle to Sydney flights are approximately 20% 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

$468

Fastest flight time

18h 20m

Direct flights

None

Airports in Sydney

1 airport
The best one-way flight to Sydney from Seattle in the past 72 hours is $468. The best round-trip flight deal from Seattle to Sydney found on momondo in the last 72 hours is $898.
The fastest flight from Seattle to Sydney takes 18h 20m
There are no direct flights from Seattle to Sydney. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Sydney Kingsford Smith Airport.
There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)

  • 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 20m.

  • 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
United AirlinesPriceFrom $759Free CancellationRating
7.4
8,685 reviews
Search United Airlines flights
American AirlinesPriceFrom $807Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Air CanadaPriceFrom $834Free CancellationRating
7.0
9,197 reviews
Search Air Canada flights
DeltaPriceFrom $853Free CancellationRating
8.0
7,920 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $858Free CancellationRating
7.9
2,393 reviews
Search Hawaiian Airlines flights
ANAPriceFrom $861Free CancellationRating
8.3
852 reviews
Search ANA flights
Qantas AirwaysPriceFrom $866Free CancellationRating
7.5
828 reviews
Search Qantas Airways flights
Alaska AirlinesPriceFrom $911Free CancellationRating
8.0
9,928 reviews
Search Alaska Airlines flights

Traveling to a place near Sydney?

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

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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Τετ 4/30
Τετ 5/7

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