$602 Find Cheap Flights from Seattle to Australia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Australia departing on 18/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Best Australia Flight Deals from Seattle

Cheapest return prices found by our users on KAYAK in the last 72 hours
Sydney
Sydney1 stop$1,166
Brisbane
Brisbane1 stop$1,471
Perth
Perth1 stop$1,964
Adelaide
Adelaide2 stops$1,718
Coolangatta
Coolangatta2 stops$1,652
Hobart
Hobart2 stops$1,782
Launceston
Launceston2 stops$2,625
Sydney
Sydney1 stop$1,166
Brisbane
Brisbane1 stop$1,471
Perth
Perth1 stop$1,964
Adelaide
Adelaide2 stops$1,718
Coolangatta
Coolangatta2 stops$1,652
Hobart
Hobart2 stops$1,782
Launceston
Launceston2 stops$2,625

Cheap Flights from Seattle to Australia (SEA-AU0)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Seattle to Australia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Seattle to Australia

Tue, 23 Sep - Wed, 22 Oct
 Logo
20:40 - 14:40SEA-SYD
25h 00m1 stop
 Logo
17:20 - 19:30SYD-SEA
20h 10m1 stop
$1,166
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Thu, 5 Jun - Fri, 13 Jun
 Logo
10:00 - 14:40SEA-SYD
35h 40m2 stops
 Logo
09:20 - 22:13SYD-SEA
29h 53m1 stop
$1,320
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Thu, 5 Jun - Sun, 8 Jun
Air Canada Logo
19:15 - 07:20SEA-SYD
19h 05m1 stop
Air Canada Logo
09:20 - 09:18SYD-SEA
16h 58m1 stop
$1,331Air Canada
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Tue, 3 Jun - Tue, 10 Jun
Air Canada Logo
10:00 - 07:20SEA-SYD
28h 20m1 stop
Air Canada Logo
09:20 - 14:13SYD-SEA
21h 53m1 stop
$1,350Air Canada
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Sun, 7 Sep - Wed, 17 Sep
Qantas Airways Logo
17:59 - 07:05SEA-SYD
20h 06m1 stop
Qantas Airways Logo
17:45 - 21:36SYD-SEA
20h 51m1 stop
$1,385Qantas Airways
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Wed, 11 Jun - Wed, 18 Jun
Qantas Airways Logo
18:52 - 07:05SEA-SYD
19h 13m1 stop
Qantas Airways Logo
17:45 - 21:34SYD-SEA
20h 49m1 stop
$1,393Qantas Airways
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Wed, 15 Oct - Wed, 29 Oct
Philippine Airlines Logo
23:35 - 06:00SEA-MEL
36h 25m1 stop
Philippine Airlines Logo
09:00 - 19:35MEL-SEA
28h 35m1 stop
$1,424Philippine Airlines
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Sun, 12 Oct - Sun, 26 Oct
Philippine Airlines Logo
23:35 - 07:30SEA-MEL
37h 55m1 stop
Philippine Airlines Logo
09:00 - 19:35MEL-SEA
28h 35m1 stop
$1,449Philippine Airlines
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Mon, 28 Jul - Tue, 12 Aug
United Airlines Logo
08:57 - 07:00SEA-SYD
29h 03m2 stops
United Airlines Logo
09:30 - 20:57SYD-SEA
28h 27m2 stops
$1,520United Airlines
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Tue, 3 Jun - Sun, 22 Jun
United Airlines Logo
08:58 - 07:00SEA-SYD
29h 02m2 stops
United Airlines Logo
10:20 - 18:25SYD-SEA
25h 05m1 stop
$1,526United Airlines
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KAYAK's insights & trends for Seattle to Australia flights

Get data-powered insights and trends into flights from Seattle to Australia to help you find the cheapest flights, the best time to fly, and much more.

What is the cheapest month to fly from Seattle to Australia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Australia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Australia is March, when tickets cost $1,594 (return) on average. On the other hand, the most expensive months are December and January, when the average cost of return tickets is $2,299 and $1,921 respectively.

What’s the cheapest day of the week to fly from Seattle to Australia?

The average price of all round-trip flights from Seattle to Australia clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Australia on a Monday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Seattle to Australia. For your return ticket, we recommend flying on a Thursday and avoiding Sundays for the best deals.

How far in advance should I book a flight from Seattle to Australia?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Australia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below-average price on the flight from Seattle to Australia, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.


Good to know

Low seasonMay
High seasonDecember
Cheapest flight$602
Best time to beat the crowds (4% less expensive on average)
Most popular time to fly (39% more expensive on average)
Flight from Seattle to Sydney

FAQs - booking Australia flights

  • How much luggage can I take if I buy an economy ticket from Seattle to Perth?

    When you fly from Seattle-Tacoma International Airport to Perth in Western Australia, you'll be landing at Perth Airport (PER). You can find a flight aboard Qatar with one stop in Hamad International Airport (DOH) that allows economy classic passengers one carry-on and two checked bags. Most other cheaper flights allow one carry-on.

  • Can I rent a car when my Seattle flight lands in Sydney?

    Sydney Kingsford Smith International Airport has rental car counters located in the arrivals area of Terminal 1 International and Terminals 2/3 Domestic. Some companies represented at include Avis, Europcar, Enterprise, and others.

  • What are some common layover cities on flights from Seattle to Brisbane, Australia?

    When you fly from Seattle-Tacoma International Airport to Brisbane Airport (BNE), you will have at least one stop. Flights on Qantas, Alaska, or United tend to stop in Los Angeles International Airport (LAX). Air Canada tends to stop in Vancouver International Airport (YVR), EVA Air in Taiwan Taoyuan International Airport (TPE), and Singapore Airlines in Singapore Changi International Airport.

  • Which airline flies a sustainable flight from the Seattle Tacoma International Airport SEA to Adelaide Airport (ADL) in South Australia?

    One of the most sustainable airlines that operates flights from Seattle to Adelaide Airport is Alaska airlines. Alaska is making successful strides to achieve net zero carbon emissions by the year 2040 by increasing operational efficiency, investing in fleet modernization, new technology, sustainable aviation fuels, and high quality carbon removal techniques.

  • How does KAYAK find such low prices on flights from Seattle to Australia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Australia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Australia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Australia is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Australia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from Seattle to Australia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Australia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Australia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Australia?

    The cheapest time of day to fly to Australia is generally in the evening, when retur flights cost $923 on average. Morning departures are around 23% more expensive than evening flights, on average. The most expensive time of day to fly to Australia is generally in the morning, which is peak travel time and where the average cost of a ticket is $1,133.

Top tips for finding cheap flights to Australia

  • Travelers who wish to fly from Seattle to Australia will be departing from the Seattle-Tacoma International Airport (SEA). Situated about 13 miles south of the heart of Seattle, this airport is a hub for several airlines, including Alaska, Delta Air Lines, and Horizon Air.
  • Flights from Seattle to Sydney, Australia will land at Sydney Kingsford Smith International Airport (SYD). While it is unlikely that you will find a non-stop flight from Seattle to Sydney, several airlines operate flights with one connection. Air Canada stops in Vancouver, Qantas and Delta in Los Angeles, and ANA in Tokyo.
  • When you fly from Seattle to Melbourne in Victoria, Australia, you will land at Melbourne Airport (MEL). The cheapest flights available tend to involve multiple airlines and connection cities with self-transfers. However, Singapore Airlines offers flights paired with both Scoot and Jetstar that are affordable and have only one stop in Singapore Changi International Airport (SIN).
  • If you want to visit the north of Queensland, the coastal city of Cairns makes an ideal destination. You'll be landing at Cairns Airport (CNS), a hub for Jetstar, Qantas, Australian Airlines, and others. One of the most affordable flights available is aboard Japan Airlines paired with Jetstar with one stop in Narita International Airport (NRT).
  • Economy-ticketed passengers at Seattle-Tacoma International Airport can relax in refined comfort and style while waiting for a flight to Australia. You can show a prepaid lounge pass or pay an entrance fee in order to access the exclusive lounge The Club at SEA. There is one location in the Central Terminal and one in the South Satellite.

Top airlines flying from Seattle to Australia

Need help choosing which airline to fly with from Seattle to Australia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8730 reviews
7.7Boarding
6.6Food
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

The personnel were professional and friendly. The Boeing 737 Max 9 is too claustrophobic and was very warm at both airport gates, and still warm in the air.

8.0 ExcellentWilliam Drew, May 2025SFO - HNL
Read more United Airlines reviews

The personnel were professional and friendly. The Boeing 737 Max 9 is too claustrophobic and was very warm at both airport gates, and still warm in the air.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

Flight was great. Efficient boarding. Short flight. Early arrival. Friendly flight crew. The entertainment system did not work well. Could not access it until the aircraft reached 10K feet or more. Lots of glitches.

get E+, a must for 5 hours flight if you are tall

The first flight was better in terms of the aircraft.

we were delayed going into and out of Newark Airport by 3-4 hours each way. Excuses/reasons given were misleading. Weather was cited at first when there was NO weather issue. Turns out Newark had a shortage of staff and runway construction. United knew this and should have NOT scheduled flights when they know we would be delayed so long. I will avoid United and EWR airport at all cost going forward. Delta never looked so good.

The seat and leg room was not good. The food and beverage service was good.

Liked fold flat bed. Didn’t like having no window. Didn’t like poor choice of food and being served dinner very late, hours after take off of a 7:40pm flight. Servers not friendly. Food horrible in business class.

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

A bit rush for transit. Food and entertainment are not available

the fact air Canada changed my flight from 850 PM to 815 AM with zero regard to the plans i made that last day, the cost i lost out on as things were non refundable amd shortening my first vacation in 7 years sickened me. when we purchase a service thats whats we expect. when we want to change the service we have to pay for that option but you do whatever you want . i called accessibility dept as i have a cpap and an implanted loop recorder first person said no problem just let security know you cant go thru scanners. then i got an email saying i had to fill out a fit to fly form . which again there was NO need to have that none. But that cost me money and time to have a doctor fill it out. then when i went to check in online i was declined i had to see a person at the airport instead. i couldnt get my boarding pass like everyone elseso here I was contacting air canada so I would have a easy travel experience and it ended up being a nightmare with more work for me, more cost and time. the flight itself was great the nightmare around it i will never subject myself to again. i tried to stick with supporting Canada but Air Canada was not worth supporting. very disappointed especially with a dept that is supposed to help disabled people not make an already challenging event not worth going thru at all.

Most courteous, helpful employees and all flights were on time.

All was good except for the seats, not very comfy.

2.5 hour delay sitting in the plane on the tarmac, you tell me how the experience was

I hope these comments will find their way to AC customer experience team. Me and my spouse 50 years of aged coming back from 7 days perfect vacation... While boarding in FLL flight AC1621, one of the boarding agents (tall aged african american) man literelly yeld at my wife during the picture talking process. MAM ! STEP !! BACK !!! We are not illegal immegrants beying deported, nor are we in the millitary. We are customers returning home. This was unacceptable. While boarding in YYZ flight AC1154, one of the boarding agents (tall aged caucasian) man criticied with several complesant remarks my passport condition saying that I could not travel intl with it due to stain, decoloration, and BLOOD. My passport does not have blood on it! Yes it might be in less than perfect condition, but their are ways to talk to customer that does not imply not allow a boarding agent to be angry fathery like, or a custom agent looking at a suspicious individual. Both experience were less than acceptable for might I remind you a paying CUSTOMER returning home.

Short flight so no food or entertainment. Good landing at SFO and on time. We were told no carryon luggage yet lots of people were puting bags in overhead compartments. The rules need to be made more clear. I was on the first leg of an international flight and this is the first time I could not have carryon luggage.

This flight didn't happen for me because of overbooking.

My flight was overbooked and they would not let me board. I had to book another flight and pay the full amount of that flight. I did not get any help at all from Air Canada or United Airlines.

Comfortable seats and movies entertainment available. Better experience than the flight from Toronto to Denver.

Not enough electronic outlets for charging in the Air Canada waiting to board area but the Most important thing….the plane was booked to only 40% capacity and my row of 2 other seats were empty. My row happened to be one of the few rows that did NOT have raising arm rests. The flight attendant made effort to seat me in a different row. I needed wheelchair assistance due to a cyst on my knee and struggled to move from seat to seat to get to the row. Those 2 empty seats tormented me the entire 15+ hour flight as I had to be upright the entire flight and was not able to elevate my knee. Lots of other passengers were laying down due to the arm rest being able to retract. It is a shame that he couldn’t be gracious and find a row that I could move to.

Everything you need to know for your flight from Seattle to Australia

Information on your arrival and departure airports

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