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Cheap flights from Idaho to Sydney from $809

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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
1 Sep — 8 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to Sydney
Explore the most affordable flight options available from Idaho to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 August 2026.

Sun 13/916:19
GEG
-
SYD
1 stop21h 31m
Delta
Sun 20/909:15
SYD
-
GEG
1 stop23h 24m
Delta
Deal found 30/7$1,548
Sun 1/1114:14
GEG
-
SYD
2 stops47h 46m
Multiple Airlines
Sat 21/1111:15
SYD
-
GEG
1 stop31h 12m
Multiple Airlines
Deal found 30/7$1,582
Tue 8/912:49
GEG
-
SYD
2 stops24h 36m
Multiple Airlines
Tue 22/909:10
SYD
-
GEG
2 stops21h 12m
Multiple Airlines
Deal found 30/7$1,586
Sat 12/916:26
GEG
-
SYD
1 stop22h 04m
Multiple Airlines
Mon 5/1010:10
SYD
-
GEG
1 stop31h 25m
Multiple Airlines
Deal found 31/7$1,592
Sat 29/813:27
GEG
-
SYD
2 stops25h 03m
Multiple Airlines
Sat 5/917:50
SYD
-
GEG
2 stops23h 09m
Multiple Airlines
Deal found 30/7$1,609
Mon 12/1007:20
BOI
-
SYD
1 stop31h 10m
Multiple Airlines
Wed 28/1006:00
SYD
-
BOI
2 stops47h 28m
Multiple Airlines
Deal found 29/7$1,754
Mon 12/1007:20
BOI
-
SYD
1 stop31h 10m
Multiple Airlines
Mon 26/1014:00
SYD
-
BOI
2 stops25h 57m
Multiple Airlines
Deal found 31/7$1,824
Sun 11/1016:00
BOI
-
SYD
1 stop22h 50m
Delta
Sun 25/1010:15
SYD
-
BOI
1 stop21h 32m
Delta
Deal found 31/7$1,858
Mon 12/1014:41
BOI
-
SYD
2 stops24h 24m
American Airlines
Wed 28/1011:20
SYD
-
BOI
2 stops22h 39m
American Airlines
Deal found 29/7$1,861
Wed 30/906:25
BOI
-
SYD
2 stops32h 55m
Air Canada
Mon 5/1010:20
SYD
-
BOI
2 stops40h 14m
Air Canada
Deal found 31/7$1,866
Mon 12/1007:03
BOI
-
SYD
1 stop31h 47m
Delta
Mon 26/1009:40
SYD
-
BOI
1 stop22h 07m
Delta
Deal found 31/7$1,876
Sat 10/1017:59
BOI
-
SYD
2 stops44h 51m
Delta
Mon 26/1009:40
SYD
-
BOI
1 stop22h 07m
Delta
Deal found 31/7$1,885

Find flight deals from Idaho to Sydney

Keep the following information in mind while searching for Idaho to Sydney flight deals. Data was last updated 2 August 2026.

Round-trip from

$1,548

One-way from

$809

Popular in

November

Cheapest in

March

Average price

$1,675
Delta
  • Delta
  • 13/9-20/9
  • 2 total stops
  • 44h 55m total
  • Idaho to Sydney
Search Deals
1/12
  • 1/12
  • 2 total stops
  • 32h 54m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($301 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($76 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to Sydney 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 2 August 2026.
Use the filters below to find and compare flights from Idaho to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 13/9

16:19-06:50

1 stop21h 31m

Sydney Kingsford Smith

Sun 20/9

09:15-15:39

1 stop23h 24m

$1,548

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 2/12

06:00-08:30

2 stops31h 30m

Sydney Kingsford Smith

Tue 15/12

10:40-12:29

2 stops20h 49m

$1,555

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 1/11

14:14-09:00

2 stops47h 46m

Sydney Kingsford Smith

Sat 21/11

11:15-23:27

1 stop31h 12m

$1,582

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 14/10

18:50-07:55

1 stop20h 05m

Sydney Kingsford Smith

Wed 28/10

11:50-21:15

1 stop26h 25m

$1,928

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 30/9

14:14-06:55

1 stop24h 41m

Sydney Kingsford Smith

Mon 5/10

11:20-14:05

1 stop19h 45m

$2,128
Fastest return journey

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 28/10

19:10-09:20

1 stop21h 10m

Sydney Kingsford Smith

Sun 1/11

11:50-17:42

1 stop22h 52m

$2,128

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 28/10

18:57-16:00

2 stops28h 03m

Sydney Kingsford Smith

Sun 1/11

11:20-14:40

1 stop20h 20m

$2,131
Cheapest one-way

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 7/10

05:00-08:20

2 stops33h 20m

$832

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 22/11

16:25-20:15

3 stops33h 50m

$898

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 7/10

14:51-08:05

1 stop23h 14m

$1,092

Flights are sorted by cheapest return flights first.

Deals found on 30/7

Showing 1-10 of 11 resultsSorted by cheapest first
1
2

Best time to book a flight from Idaho to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Idaho 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 Idaho to Sydney

No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sydney from Idaho?

    Sydney Kingsford Smith (SYD), located 7.5 km from the city centre, is the airport you fly into when you book flights from Idaho to Sydney.

  • How long is the flight from Idaho to Sydney?

    Departing from Idaho to Sydney will take you 20h 05m. Airlines will cover a distance of 12704 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • Can I find deals for flights from Idaho to Sydney that include hotel bookings?

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

  • How can I find direct flights from Idaho to Sydney?

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

  • Can I find deals for business class flights from Idaho to Sydney?

    Yes. Cheapflights offers flight deals from Idaho to Sydney 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Katoomba
Manly
Lithgow
Cronulla
Randwick
Terrigal
Leura
Bondi Beach
Coogee

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How does Cheapflights help users find flights from Idaho to Sydney?

Cheapflights makes it easy to find Idaho to Sydney flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Idaho to Sydney?

Cheapflights helps you find that perfect flight to Sydney from Idaho by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Idaho to Sydney with no change fees?

Certainly. Search results for flights to Sydney from Idaho 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 Idaho to Sydney become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Sydney from Idaho today and book when prices fit your budget.

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