$629 Cheap Flights from Adelaide (ADL) to Seattle (SEA)

View $629 flight on Mon, Oct 20, 2025Opens in a new window

Popular airlines from Adelaide, SA Airport (ADL) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Adelaide to Seattle (ADL-SEA)

Prices were available within the past 7 days and start at $629 for one-way flights and $1,135 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fiji Airways
Thu, Jan 29 - Thu, Aug 27
ADL
Adelaide
SEA
Seattle
$1,135 Roundtrip, found 6 days ago
$1,135
Roundtrip
found 6 days ago
Select Fiji Airways flight, departing Thu, Jan 29 from Adelaide to Seattle, returning Thu, Aug 27, priced at $1,135 found 6 days ago
Qantas Airways
Thu, Jan 29 - Thu, Aug 27
ADL
Adelaide
SEA
Seattle
$1,281 Roundtrip, found 6 days ago
$1,281
Roundtrip
found 6 days ago
Select Qantas Airways flight, departing Thu, Jan 29 from Adelaide to Seattle, returning Thu, Aug 27, priced at $1,281 found 6 days ago
Virgin Australia
Thu, Nov 13 - Sun, Nov 30
ADL
Adelaide
SEA
Seattle
$1,313 Roundtrip, found 22 hours ago
$1,313
Roundtrip
found 22 hours ago
Select Virgin Australia flight, departing Thu, Nov 13 from Adelaide to Seattle, returning Sun, Nov 30, priced at $1,313 found 22 hours ago
Virgin Australia
Wed, Jul 15 - Wed, Jul 22
ADL
Adelaide
SEA
Seattle
$1,395 Roundtrip, found 2 days ago
$1,395
Roundtrip
found 2 days ago
Select Virgin Australia flight, departing Wed, Jul 15 from Adelaide to Seattle, returning Wed, Jul 22, priced at $1,395 found 2 days ago
Virgin Australia
Fri, May 8 - Mon, May 18
ADL
Adelaide
SEA
Seattle
$1,396 Roundtrip, found 5 days ago
$1,396
Roundtrip
found 5 days ago
Select Virgin Australia flight, departing Fri, May 8 from Adelaide to Seattle, returning Mon, May 18, priced at $1,396 found 5 days ago
Virgin Australia
Mon, Oct 13 - Wed, Oct 22
ADL
Adelaide
SEA
Seattle
$1,419 Roundtrip, found 21 hours ago
$1,419
Roundtrip
found 21 hours ago
Select Virgin Australia flight, departing Mon, Oct 13 from Adelaide to Seattle, returning Wed, Oct 22, priced at $1,419 found 21 hours ago
Virgin Australia
Fri, May 8 - Mon, May 18
ADL
Adelaide
SEA
Seattle
$1,459 Roundtrip, found 5 days ago
$1,459
Roundtrip
found 5 days ago
Select Virgin Australia flight, departing Fri, May 8 from Adelaide to Seattle, returning Mon, May 18, priced at $1,459 found 5 days ago
Air Canada
Thu, Nov 13 - Sun, Nov 30
ADL
Adelaide
SEA
Seattle
$1,477 Roundtrip, found 22 hours ago
$1,477
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Thu, Nov 13 from Adelaide to Seattle, returning Sun, Nov 30, priced at $1,477 found 22 hours ago
Qantas Airways
Thu, Jan 29 - Thu, Aug 27
ADL
Adelaide
SEA
Seattle
$1,479 Roundtrip, found 6 days ago
$1,479
Roundtrip
found 6 days ago
Select Qantas Airways flight, departing Thu, Jan 29 from Adelaide to Seattle, returning Thu, Aug 27, priced at $1,479 found 6 days ago
Singapore Airlines
Thu, Nov 13 - Sun, Nov 30
ADL
Adelaide
SEA
Seattle
$1,530 Roundtrip, found 22 hours ago
$1,530
Roundtrip
found 22 hours ago
Select Singapore Airlines flight, departing Thu, Nov 13 from Adelaide to Seattle, returning Sun, Nov 30, priced at $1,530 found 22 hours ago
Flights from Adelaide (ADL) to Seattle (SEA)
Origin airport
Adelaide
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Air Canada, Air New Zealand, All Nippon Airways, Emirates, Qantas Airways, Qatar Airways, Singapore Airlines
Roundtrip price
$1,134
Distance
8337 mi

Adelaide to Seattle Flights

The cheapest times to fly from Adelaide to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Adelaide to Seattle are during the month of January. You can find some of the cheapest flights from Adelaide to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Adelaide to Seattle

Sunday is one of the best days to book for cheap flights from Adelaide to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Adelaide to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Adelaide to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $629 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Adelaide to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Adelaide to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA) cost?
Snag a cheap one-way flight from $629 or cheap return flight from $1,135 from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from ADL to SEA is January, when there's less demand. Off-peak season is often when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from ADL to SEA, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA)?
Nonstop flights from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ADL to SEA?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA)?
Book a flight from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures later than this are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your ticket from ADL to SEA just before your journey is usually more expensive. However, if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book an ADL to SEA flight and hotel package?
Opting for an ADL to SEA flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our impressive range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Adelaide Airport (ADL) to Seattle - Tacoma Intl. Airport (SEA)?
Generally, it's possible to reschedule or cancel your ADL to SEA flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.