Find flights
When to book
Airlines
FAQs

Cheap flights from Adelaide to Seattle from $1,406

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
ADL — SEA
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Adelaide to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Adelaide (ADL) to Seattle (SEA). 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 18 September 2025.

Round-trip from

$1,406

Popular in

October

Cheapest in

November

Average price

$1,761
United Airlines
  • United Airlines
  • 11/3-15/3
  • 3 total stops
  • 62h 30m total
  • Adelaide to Seattle
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($22 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($100 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Adelaide to Seattle

Cheapest flights from Adelaide to Seattle
Explore the most affordable flight options available from Adelaide to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Mon 15/1214:55ADL - SEA
2 stops37h 44mUnited Airlines
Sat 17/119:30SEA - ADL
1 stop19h 30mUnited Airlines
Deal found 15/9$1,653
Mon 15/1214:55ADL - SEA
2 stops37h 44mUnited Airlines
Tue 20/112:35SEA - ADL
2 stops31h 05mUnited Airlines
Deal found 15/9$1,695
Tue 16/1207:15ADL - SEA
2 stops43h 39mUnited Airlines
Fri 16/119:30SEA - ADL
2 stops44h 55mUnited Airlines
Deal found 17/9$1,763

Cheapflights Fare Finder

 
Customise your flight search to find flights from Adelaide to Seattle 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 18 September 2025.
Use the filters below to find and compare flights from Adelaide to Seattle that are best for you.

Fly from

Adelaide

Fly to

Seattle

Route

Depart

Return

Price

AdelaideSeattle

ADL - SEA

ADLSEA

Adelaide

Wed 11/3

13:55-15:05

1 stop18h 40m

Seattle/Tacoma Intl

Sun 15/3

19:10-08:30

2 stops43h 50m

$1,406

AdelaideSeattle

ADL - SEA

ADLSEA

Adelaide

Wed 11/3

06:10-09:31

2 stops20h 51m

Seattle/Tacoma Intl

Sun 15/3

15:40-13:55

2 stops28h 45m

$1,505

AdelaideSeattle

ADL - SEA

ADLSEA

Adelaide

Mon 15/12

14:55-10:09

2 stops37h 44m

Seattle/Tacoma Intl

Sat 17/1

12:25-09:30

2 stops26h 35m

$1,653

AdelaideSeattle

ADL - SEA

ADLSEA

Adelaide

Mon 15/12

14:55-10:09

2 stops37h 44m

Seattle/Tacoma Intl

Tue 20/1

12:35-14:10

2 stops31h 05m

$1,695

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Best time to book a flight from Adelaide to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Adelaide 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 Adelaide to Seattle

What is the cheapest month to book a flight from Adelaide to Seattle?

Currently, March is the cheapest month in which you can book a flight from Adelaide to Seattle (average of $875). Flying from Adelaide to Seattle in December is currently the most expensive (average of $1,297). 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 ADL to SEA?

Find hourly flight availability from Adelaide to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 September 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 26% on flights from Adelaide to Seattle by exploring options for tickets in the afternoon.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 18 September 2025.
See what other customers who have flown with Singapore Airlines, Virgin Australia, andQantas Airways from Adelaide to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

8.0

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
Singapore Airlines
8.1
Very Good
1,367 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

8.0

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
Virgin Australia
7.6
Good
416 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

8.0

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
Qantas Airways
7.5
Good
907 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

8.0

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
United Airlines
7.4
Good
8,926 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

8.0

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
Air Canada
7.1
Good
10,000 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

8.0

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered

Related info for your journey

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

    United Airlines and Air Canada can get you from Adelaide to Seattle in just under 18h 40m. Your travel time can differ by up to 2h 11m. There are 13409 km between Adelaide and Seattle. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Adelaide to Seattle round-trip?

    According to our current data, Air New Zealand ($919), Air Canada ($1,249), and Singapore Airlines ($1,394) offers the cheapest pricing from Adelaide to Seattle. These flights start at 52% lower than the current average price 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Adelaide to Seattle 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 Adelaide to Seattle?

    Currently, March is the cheapest month in which you can book a flight from Adelaide to Seattle (average of $875). Flying from Adelaide to Seattle in December is currently the most expensive (average of $1,297). 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.

See more FAQs

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Ocean Shores

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Adelaide to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Adelaide to Portland flights

Top 6 airlines flying from Adelaide to Seattle

Discover the top 6 airlines that operate flights from Adelaide to Seattle. 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 18 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air New ZealandCheapest$919Average$1,519FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
Air CanadaCheapest$1,249Average$1,597FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Singapore AirlinesCheapest$1,394Average$1,644FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Qantas AirwaysCheapest$1,428Average$1,804FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Virgin AustraliaCheapest$1,706Average$2,011FlexibilityNo cancel feeOn-time80%
Search Virgin Australia flights
United AirlinesCheapest$1,708Average$2,012FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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 Adelaide to Seattle?

Cheapflights helps you search for flights from Adelaide to Seattle via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Adelaide to Seattle?

Cheapflights simply makes it quick and affordable to book flights from Adelaide to Seattle by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Adelaide to Seattle with no change fees?

Certainly. Search results for flights to Seattle from Adelaide shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Adelaide to Seattle become cheaper?

Yes! Start tracking prices for Adelaide to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.