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$725+ 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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
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Cheap flight deals from Seattle to Adelaide

Cheapest flights from Seattle to Adelaide
Explore the most affordable flight options available from Seattle to Adelaide. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 20, 2026.

This Air Canada deal was found by Cheapflights users on 1/18. 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.
Wed 3/48:00 pm
SEA
-
ADL
2 stops27h 30m
Multiple Airlines
Wed 3/116:10 am
ADL
-
SEA
2 stops20h 51m
Multiple Airlines
Deal found 1/18$962
This Expedia deal was found by Cheapflights users on 1/18. 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.
Mon 2/93:40 pm
SEA
-
ADL
2 stops31h 50m
Multiple Airlines
Mon 2/168:00 pm
ADL
-
SEA
2 stops37h 01m
Multiple Airlines
Deal found 1/18$1,056
This United Airlines deal was found by Cheapflights users on 1/18. 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.
Mon 2/97:30 pm
SEA
-
ADL
1 stop19h 30m
United Airlines
Mon 2/162:55 pm
ADL
-
SEA
1 stop22h 01m
United Airlines
Deal found 1/18$1,115
This Air Canada deal was found by Cheapflights users on 1/17. 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.
Sun 2/155:50 am
SEA
-
ADL
2 stops42h 50m
Air Canada
Thu 2/196:10 am
ADL
-
SEA
2 stops21h 35m
Air Canada
Deal found 1/17$1,161
This Alaska Airlines deal was found by Cheapflights users on 1/19. 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.
Mon 7/68:00 am
SEA
-
ADL
2 stops22h 05m
Multiple Airlines
Fri 7/248:50 am
ADL
-
SEA
2 stops31h 39m
Multiple Airlines
Deal found 1/19$1,213
This KAYAK deal was found by Cheapflights users on 1/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/125:50 pm
SEA
-
ADL
2 stops24h 55m
Multiple Airlines
Mon 3/301:35 pm
ADL
-
SEA
2 stops22h 46m
Multiple Airlines
Deal found 1/19$1,405
This oojo deal was found by Cheapflights users on 1/18. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/44:05 pm
SEA
-
ADL
1 stop30h 30m
Qatar Airways
Wed 3/116:20 pm
ADL
-
SEA
2 stops35h 50m
Qatar Airways
Deal found 1/18$1,534
This United Airlines deal was found by Cheapflights users on 1/19. 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.
Thu 3/127:34 pm
SEA
-
ADL
1 stop19h 26m
United Airlines
Mon 3/307:40 am
ADL
-
SEA
2 stops30h 47m
United Airlines
Deal found 1/19$1,562
This United Airlines deal was found by Cheapflights users on 1/18. 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.
Sun 2/156:04 pm
SEA
-
ADL
2 stops25h 36m
United Airlines
Thu 2/197:15 am
ADL
-
SEA
3 stops32h 16m
United Airlines
Deal found 1/18$1,642

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 January 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$1,161
(Air Canada)

One-way from

$725
(Qantas Airways)
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

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 January 20, 2026.
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

Wed 3/4

8:00 pm-6:00 pm

2 stops27h 30m

Adelaide

Wed 3/11

6:10 am-9:31 am

2 stops20h 51m

$962

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 2/9

3:40 pm-6:00 pm

2 stops31h 50m

Adelaide

Mon 2/16

8:00 pm-2:31 pm

2 stops37h 01m

$1,056

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 2/9

7:30 pm-9:30 am

1 stop19h 30m

Adelaide

Mon 2/16

2:55 pm-6:26 pm

1 stop22h 01m

$1,115

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 2/15

8:00 pm-7:10 pm

2 stops28h 40m

Adelaide

Thu 2/19

6:10 am-7:16 pm

2 stops31h 36m

$1,161

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 3/12

5:50 pm-12:15 pm

2 stops24h 55m

Adelaide

Mon 3/30

1:35 pm-6:51 pm

2 stops22h 46m

$1,405

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 3/4

4:05 pm-5:05 pm

1 stop30h 30m

Adelaide

Wed 3/11

6:20 pm-12:40 pm

2 stops35h 50m

$1,534

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 3/12

7:34 pm-8:30 am

1 stop19h 26m

Adelaide

Mon 3/30

7:40 am-8:57 pm

2 stops30h 47m

$1,562

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 2/15

6:04 pm-2:10 pm

2 stops25h 36m

Adelaide

Thu 2/19

7:15 am-9:01 pm

3 stops32h 16m

$1,642

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 5/17

5:16 pm-7:00 pm

2 stops33h 14m

$725

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 5/17

6:49 pm-11:15 am

3 stops47h 56m

$1,131

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

Showing 1-10 of 11 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 January.
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.

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 January 20, 2026.
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
973 reviews

Comfort

7.5

Entertainment

7.2

Overall

7.5

Food

7.0

Crew

8.2

Boarding

7.7

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
973 reviews
Qantas Airways
7.5
Good
973 reviews

Comfort

7.5

Entertainment

7.2

Overall

7.5

Food

7.0

Crew

8.2

Boarding

7.7

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 $1,115, United Airlines can have you in Adelaide from Seattle in 19h 30m. Seattle and Adelaide are separated by a distance of 8332 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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..

  • 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

Browse thousands of different options on Cheapflights for your next trip

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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 January 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,088Average$1,166FlexibilityNo cancel feeOn-time74%

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