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$628+ Cheap flights from Seattle (SEA) to Adelaide (ADL)

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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
Jan 9 — Jan 161
Fri 1/9
Fri 1/16
1 adult, Economy
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Cheap flight deals from Seattle to Adelaide

Best flights from Seattle to Adelaide
Discover carefully curated flight deals from Seattle to Adelaide that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 10, 2025.

This FlightHub deal was found by Cheapflights users on 12/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/58:00 pmSEA - ADL
2 stops23h 25mMultiple Airlines
Tue 2/246:10 amADL - SEA
2 stops26h 51mMultiple Airlines
Deal found 12/7$989
This Air Canada deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/238:00 pmSEA - ADL
2 stops30h 15mAir Canada
Fri 1/306:10 amADL - SEA
2 stops21h 51mAir Canada
Deal found 12/9$1,034
This United Airlines deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/2412:35 pmSEA - ADL
1 stop26h 25mUnited Airlines
Sat 1/312:55 pmADL - SEA
2 stops37h 30mUnited Airlines
Deal found 12/9$1,217
This Alaska Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/137:00 amSEA - ADL
2 stops30h 45mAlaska Airlines
Sat 2/285:10 pmADL - SEA
2 stops30h 45mAlaska Airlines
Deal found 12/8$1,332
This Air Canada deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:05 amSEA - ADL
2 stops35h 35mAir Canada
Mon 3/26:55 pmADL - SEA
2 stops33h 06mAir Canada
Deal found 12/8$1,089
This Trip.com deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/2412:59 pmSEA - ADL
2 stops28h 46mMultiple Airlines
Sat 1/311:15 pmADL - SEA
2 stops28h 01mMultiple Airlines
Deal found 12/9$1,141
This Air Canada deal was found by Cheapflights users on 12/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/288:00 pmSEA - ADL
2 stops25h 50mAir Canada
Wed 3/46:55 pmADL - SEA
2 stops33h 06mAir Canada
Deal found 12/7$1,141
This Expedia deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/223:57 pmSEA - ADL
2 stops25h 48mMultiple Airlines
Thu 1/291:15 pmADL - SEA
2 stops23h 07mMultiple Airlines
Deal found 12/8$1,197

Find flight deals from Seattle to Adelaide

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Adelaide (ADL). 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 December 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$989
(FlightHub)

One-way from

$628
(KAYAK)

Popular in

January

Cheapest in

September

Average price

$1,274
Provider with most accurate pricing for Seattle/Tacoma Intl-Adelaide flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Adelaide flights.
Search Deals
From Seattle/Tacoma Intl to Adelaide
Search Deals
One-way flight from Seattle/Tacoma Intl to Adelaide
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($234 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($90 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Adelaide 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 2,558,603 searches. Data last updated December 10, 2025.
Use the filters below to find and compare flights from Seattle to Adelaide that are best for you.

Fly from

Seattle

Fly to

Adelaide

Route

Depart

Return

Price

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 2/5

8:00 pm-1:55 pm

2 stops23h 25m

Adelaide

Tue 2/24

6:10 am-2:31 pm

2 stops26h 51m

$989

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 1/23

8:00 pm-8:45 pm

2 stops30h 15m

Adelaide

Fri 1/30

6:10 am-9:31 am

2 stops21h 51m

$1,034

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 2/26

10:05 am-4:10 pm

2 stops35h 35m

Adelaide

Mon 3/2

6:55 pm-9:31 am

2 stops33h 06m

$1,089

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 1/24

12:59 pm-12:15 pm

2 stops28h 46m

Adelaide

Sat 1/31

1:15 pm-10:46 pm

2 stops28h 01m

$1,141

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 2/28

8:00 pm-4:20 pm

2 stops25h 50m

Adelaide

Wed 3/4

6:55 pm-9:31 am

2 stops33h 06m

$1,141

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 1/22

3:57 pm-12:15 pm

2 stops25h 48m

Adelaide

Thu 1/29

1:15 pm-5:52 pm

2 stops23h 07m

$1,197

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 1/24

12:35 pm-9:30 am

1 stop26h 25m

Adelaide

Sat 1/31

2:55 pm-9:55 am

2 stops37h 30m

$1,217

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 1/13

7:00 am-8:15 am

2 stops30h 45m

Adelaide

Sat 2/28

5:10 pm-5:25 am

2 stops30h 45m

$1,332

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 1/20

10:59 am-12:15 pm

2 stops30h 46m

$628

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 4/11

6:00 am-11:05 am

2 stops36h 35m

$699

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/8

Showing 1-10 of 14 results
1
2

Compare providers for flights from Seattle to Adelaide

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Adelaide in December.
ProviderPrice AccuracyTrust Score*
GurufarePrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Adelaide flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Adelaide flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Adelaide flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Adelaide flights, Cheapflights users trust Gurufare the most. Gurufare has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Adelaide flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Adelaide

Have a flexible travel schedule? Discover the best time to fly to Adelaide from Seattle with our price prediction graph.
Estimated round-trip 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 Adelaide

What is the cheapest time of day to fly from SEA to ADL?

Find hourly flight availability from Seattle to Adelaide. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 10, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Adelaide in the morning. If you’re flexible enough to do this you can expect to save up to 25% on your trip compared to booking a flight in the afternoon.

Reviews of airlines servicing Adelaide

Get insights into the airlines that provide service to Adelaide. 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 Adelaide. Reviews last updated December 10, 2025.
Read through reviews of airlines operating flights from Seattle to Adelaide, such as Qantas Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
947 reviews

Boarding

7.7

Overall

7.5

Crew

8.1

Food

7.0

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Qantas Airways
7.5
Good
947 reviews
Qantas Airways
7.5
Good
947 reviews

Boarding

7.7

Overall

7.5

Crew

8.1

Food

7.0

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Adelaide. 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 Adelaide?

    For as low as $1,034, Air Canada can have you in Adelaide from Seattle in 30h 15m. Seattle and Adelaide are separated by a distance of 8332 mi.

  • What is the cheapest airline to fly from Seattle to Adelaide round-trip?

    Qantas Airways, at $1,088, was found to be the cheapest airline from Seattle to Adelaide.. This flight start at 19% lower than the current average price 3 months from now.

  • Can I find deals for flights from Seattle to Adelaide that include hotel bookings?

    Yes. In addition to deals on Seattle to Adelaide flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Adelaide?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Adelaide.

  • Can I find deals for business class flights from Seattle to Adelaide?

    Yes. Cheapflights offers flight deals from Seattle to Adelaide by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Adelaide?

Book flights to Adelaide if you plan to visit one of these locations
Glenelg

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Top airline flying from Seattle to Adelaide

Discover the top airline that operate flights from Seattle to Adelaide. 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 2,558,603 searches. Data last updated December 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,088Average$1,166FlexibilityNo cancel feeOn-time74%

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