This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
4 Jan — 11 Jan1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Sydney Kingsford Smith are usually found in August or September, booked 25 days in advance, depart on a Monday or Wednesday and return on a Thursday
Cheap flight deals from Seattle to Sydney
Enter your travel dates to find the best prices.
Cheapest flights from Seattle to Sydney
Explore the most affordable flight options available from Seattle to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.
Wed 31/1215:40SEA - SYD
1 stop22h 55mAir Canada
Tue 10/211:20SYD - SEA
1 stop26h 56mAir Canada
Deal found 3/12$1,376
Wed 31/1206:00SEA - SYD
1 stop32h 00mQantas Airways
Tue 10/207:05SYD - SEA
2 stops24h 24mQantas Airways
Deal found 4/12$1,496
Fri 5/1215:40SEA - SYD
1 stop22h 55mAir Canada
Fri 12/1211:20SYD - SEA
1 stop17h 11mAir Canada
Deal found 4/12$1,720
Sat 27/1220:00SEA - SYD
1 stop18h 35mAir Canada
Sat 17/119:15SYD - SEA
2 stops33h 16mAir Canada
Deal found 3/12$1,729
Tue 9/1217:59SEA - SYD
2 stops28h 16mQantas Airways
Tue 16/1211:20SYD - SEA
1 stop26h 00mQantas Airways
Deal found 2/12$1,759
Wed 31/1213:35SEA - SYD
2 stops23h 55mDelta
Tue 10/214:15SYD - SEA
2 stops23h 14mDelta
Deal found 3/12$1,763
Tue 9/1210:38SEA - SYD
1 stop25h 17mAmerican Airlines
Tue 16/1214:05SYD - SEA
1 stop22h 46mAmerican Airlines
Deal found 2/12$1,791
Tue 9/1220:00SEA - SYD
2 stops41h 40mAir Canada
Tue 16/1215:00SYD - SEA
2 stops37h 31mAir Canada
Deal found 2/12$1,807
Fri 5/1206:25SEA - SYD
1 stop31h 35mQantas Airways
Fri 12/1214:55SYD - SEA
2 stops23h 40mQantas Airways
Deal found 3/12$1,842
Best flights from Seattle to Sydney
Discover carefully curated flight deals from Seattle to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 December 2025.
Sun 25/113:36SEA - SYD
1 stop21h 34mMultiple Airlines
Sun 1/221:25SYD - SEA
1 stop18h 09mMultiple Airlines
Deal found 4/12$1,658
Thu 22/115:57SEA - SYD
1 stop20h 28mQantas Airways
Sat 31/111:20SYD - SEA
1 stop27h 02mQantas Airways
Deal found 3/12$1,735
Tue 6/107:00SEA - SYD
1 stop17h 45mAlaska Airlines
Fri 6/221:40SYD - SEA
1 stop19h 37mAlaska Airlines
Deal found 3/12$1,754
Thu 29/111:17SEA - SYD
1 stop24h 33mDelta
Wed 25/210:40SYD - SEA
1 stop23h 04mDelta
Deal found 5/12$1,757
Fri 23/112:35SEA - SYD
1 stop25h 40mUnited Airlines
Sat 31/112:10SYD - SEA
1 stop18h 20mUnited Airlines
Deal found 3/12$1,831
Sun 19/420:00SEA - SYD
2 stops22h 25mMultiple Airlines
Mon 11/506:00SYD - SEA
2 stops20h 21mMultiple Airlines
Deal found 5/12$1,674
Tue 6/113:30SEA - SYD
1 stop22h 20mDelta
Tue 27/110:40SYD - SEA
2 stops26h 49mDelta
Deal found 4/12$1,763
Tue 6/113:30SEA - SYD
1 stop24h 00mDelta
Fri 6/210:40SYD - SEA
2 stops32h 29mDelta
Deal found 4/12$1,839
Sun 4/107:00SEA - SYD
1 stop17h 45mAlaska Airlines
Sat 10/121:40SYD - SEA
1 stop19h 37mAlaska Airlines
Deal found 3/12$2,119
Mon 19/120:00SEA - SYD
2 stops25h 40mMultiple Airlines
Mon 26/122:10SYD - SEA
3 stops30h 21mMultiple Airlines
Deal found 4/12$2,049
Last-minute flights from Seattle to Sydney
Discover last-minute flight deals from Seattle to Sydney. Data last updated 5 December 2025 and is based on user searches.
Wed 10/1220:00SEA - SYD
1 stop39h 55mAir Canada
Tue 13/113:00SYD - SEA
2 stops52h 06mAir Canada
Deal found 3/12$2,004
Wed 10/1205:25SEA - SYD
2 stops32h 05mDelta
Tue 13/114:15SYD - SEA
2 stops21h 23mDelta
Deal found 3/12$2,066
Wed 10/1217:59SEA - SYD
2 stops28h 31mQantas Airways
Wed 7/119:15SYD - SEA
2 stops38h 04mQantas Airways
Deal found 3/12$2,205
Thu 11/1215:40SEA - SYD
2 stops46h 00mAir Canada
Tue 13/113:00SYD - SEA
2 stops52h 06mAir Canada
Deal found 3/12$2,033
Thu 11/1214:25SEA - SYD
1 stop22h 00mMultiple Airlines
Mon 12/119:15SYD - SEA
2 stops43h 52mMultiple Airlines
Deal found 3/12$2,117
Thu 11/1205:25SEA - SYD
2 stops32h 05mDelta
Mon 12/110:40SYD - SEA
2 stops24h 58mDelta
Deal found 3/12$2,141
Thu 11/1214:40SEA - SYD
1 stop34h 05mAlaska Airlines
Sat 10/121:40SYD - SEA
1 stop19h 37mAlaska Airlines
Deal found 3/12$2,196
Fri 12/1215:40SEA - SYD
2 stops47h 50mAir Canada
Tue 23/1211:20SYD - SEA
1 stop17h 11mAir Canada
Deal found 4/12$1,910
Fri 12/1215:40SEA - SYD
2 stops47h 50mAir Canada
Tue 13/113:00SYD - SEA
2 stops52h 06mAir Canada
Deal found 3/12$2,087
Fri 12/1215:40SEA - SYD
1 stop22h 55mAir Canada
Mon 12/115:00SYD - SEA
2 stops37h 31mAir Canada
Deal found 3/12$2,231
One-way flights from Seattle to Sydney
Search for one-way flight options from Seattle to Sydney. Find affordable one-way fares based on user searches. Data last updated 5 December 2025.
Sun 15/322:30SEA - SYD
1 stop41h 20mPhilippine Airlines
Deal found 3/12$569
Sun 1/321:30SEA - SYD
1 stop41h 20mPhilippine Airlines
Deal found 3/12$573
Mon 2/310:29SEA - SYD
2 stops31h 06mMultiple Airlines
Deal found 3/12$600
Wed 4/314:30SEA - SYD
2 stops27h 05mMultiple Airlines
Deal found 3/12$631
Sat 28/213:00SEA - SYD
2 stops28h 35mMultiple Airlines
Deal found 3/12$632
Tue 24/220:40SEA - SYD
2 stops44h 55mMultiple Airlines
Deal found 2/12$637
Thu 26/210:29SEA - SYD
2 stops31h 06mMultiple Airlines
Deal found 3/12$649
Fri 27/210:29SEA - SYD
2 stops31h 06mMultiple Airlines
Deal found 3/12$655
Sun 1/310:29SEA - SYD
2 stops31h 06mMultiple Airlines
Deal found 3/12$659
Tue 3/220:50SEA - SYD
2 stops44h 45mMultiple Airlines
Deal found 3/12$662
Mon 2/300:31SEA - SYD
2 stops41h 04mMultiple Airlines
Deal found 3/12$664
Find flight deals from Seattle to Sydney
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 5 December 2025.
Customise 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, Cheapflights users made 647,157 searches. Data last updated 5 December 2025.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.
Fly from
Seattle
Fly to
Sydney
Route
Depart
Return
Price
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Sun 25/1
13:36-06:10
1 stop21h 34m
Sydney Kingsford Smith
Sun 1/2
21:25-20:34
1 stop18h 09m
$1,658
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Sun 19/4
20:00-11:25
2 stops22h 25m
Sydney Kingsford Smith
Mon 11/5
06:00-09:21
2 stops20h 21m
$1,674
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Thu 22/1
15:57-07:25
1 stop20h 28m
Sydney Kingsford Smith
Sat 31/1
11:20-19:22
1 stop27h 02m
$1,735
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Tue 6/1
07:00-19:45
1 stop17h 45m
Sydney Kingsford Smith
Fri 6/2
21:40-22:17
1 stop19h 37m
$1,754
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Thu 29/1
11:17-06:50
1 stop24h 33m
Sydney Kingsford Smith
Wed 25/2
10:40-14:44
1 stop23h 04m
$1,757
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Tue 6/1
13:30-06:50
1 stop22h 20m
Sydney Kingsford Smith
Tue 27/1
10:40-18:29
2 stops26h 49m
$1,763
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Fri 23/1
12:35-09:15
1 stop25h 40m
Sydney Kingsford Smith
Sat 31/1
12:10-11:30
1 stop18h 20m
$1,831
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Tue 6/1
13:30-08:30
1 stop24h 00m
Sydney Kingsford Smith
Fri 6/2
10:40-00:09
2 stops32h 29m
$1,839
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Mon 19/1
20:00-16:40
2 stops25h 40m
Sydney Kingsford Smith
Mon 26/1
22:10-09:31
3 stops30h 21m
$2,049
SeattleSydney
SEA - SYD
SEASYD
Seattle/Tacoma Intl
Sun 4/1
07:00-19:45
1 stop17h 45m
Sydney Kingsford Smith
Sat 10/1
21:40-22:17
1 stop19h 37m
$2,119
Flights are sorted by cheapest return flights first.
Deals found on 3/12
Showing 1-10 of 20 results
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Best time to book a flight from Seattle to Sydney
Have a flexible travel schedule? Discover the best time to fly to Sydney from Seattle with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Seattle to Sydney
Prices
More
How far ahead should I book a flight from Seattle to Sydney?
Use this chart to determine the optimal time to book a return flight from Seattle to Sydney. Price data was last updated on 28 November 2025.
The price you pay for your flight from Seattle to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 25 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Seattle to Sydney?
Currently, July is the cheapest month in which you can book a flight from Seattle to Sydney (average of $809). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SEA to SYD?
Find hourly flight availability from Seattle to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 December 2025.
A simple way to save on the total cost of your ticket is to fly from Seattle to Sydney in the afternoon. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight at midday.
What’s the top stopover airport for flights from Seattle to Sydney?
Share of one-stop return flights from Seattle to Sydney chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Vancouver (YVR) – chosen by Cheapflights users on 35% of one-stop itineraries from Seattle to Sydney on Cheapflights.
What’s the cheapest stopover airport for flights from Seattle to Sydney?
Average return fare for one-stop flights from Seattle to Sydney, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
San Francisco (SFO) is the most affordable one-stop option, with an average return flight price of $1,726.
What’s the fastest stopover option from Seattle to Sydney?
Shortest average travel time for one-stop one-way flights from Seattle to Sydney, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via San Francisco (SFO) have the shortest average one-way travel time for one-stop routes: 18h 46m.
Which airport typically offers the quickest stopover for flights from Seattle to Sydney?
Average stopover duration for one-stop one-way flights from Seattle to Sydney, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via San Francisco (SFO) offer the fastest connection on this route, with an average stopover time of 1h 54m.
Reviews of airlines servicing Sydney
Get insights into the airlines that provide service to Sydney. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sydney. Reviews last updated 5 December 2025.
Get a feel of what it's like to fly with Alaska Airlines, United Airlines, andAir Canada from Seattle to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Related info for your journey
Find useful and relevant information for your journey from Seattle to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
How long is the flight from Seattle to Sydney?
Qantas Airways, Alaska Airlines, and Delta can get you from Seattle to Sydney in just under 17h 45m. Your travel time can differ by up to 6h 48m. Airlines will cover a distance of 12463 km. Both multi-stop and direct flights can be found to your destination and back.
What are the cheapest airlines flying from Seattle to Sydney round-trip?
Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,208. Additional round-trip tickets that might be worth considering are offered by Air Canada and Alaska Airlines, with the lowest prices starting at $1,271 and $1,289, respectively. Users have found that United Airlines is 24% cheaper than the other options available to this destination.
Can I find deals for business class flights from Seattle to Sydney?
Yes. Cheapflights offers flight deals from Seattle to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to Sydney?
Currently, July is the cheapest month in which you can book a flight from Seattle to Sydney (average of $809). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Explore flights to Sydney departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 5 December 2025.
Discover the top 3 airlines that operate flights from Seattle to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 5 December 2025.
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Seattle to Sydney?
Deals for Seattle to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Seattle to Sydney?
Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from Seattle to Sydney with no change fees?
Need flexible booking options for your flight to Sydney from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Seattle to Sydney become cheaper?
Yes, Cheapflights offers price alerts on Seattle to Sydney flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.
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