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Cheap flights from Idaho to Sydney from $892

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 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
11 Jun — 18 Jun1
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 12 May 2026.

Thu 29/1014:51
GEG
-
SYD
1 stop23h 09m
Qantas Airways
Mon 2/1119:15
SYD
-
GEG
2 stops44h 40m
Qantas Airways
Deal found 7/5$1,570
Sun 10/514:14
BOI
-
SYD
2 stops24h 11m
American Airlines
Sun 24/509:10
SYD
-
BOI
2 stops23h 59m
American Airlines
Deal found 7/5$1,592
Sun 10/512:30
BOI
-
SYD
1 stop26h 25m
United Airlines
Sun 24/510:20
SYD
-
BOI
1 stop22h 24m
United Airlines
Deal found 7/5$1,597
Wed 20/518:58
BOI
-
SYD
1 stop19h 57m
United Airlines
Wed 17/610:20
SYD
-
BOI
1 stop22h 24m
United Airlines
Deal found 6/5$1,601
Mon 8/612:51
GEG
-
SYD
2 stops25h 14m
American Airlines
Mon 15/617:50
SYD
-
GEG
2 stops22h 19m
American Airlines
Deal found 7/5$1,603
Tue 12/514:14
BOI
-
SYD
2 stops25h 16m
American Airlines
Tue 19/512:00
SYD
-
BOI
1 stop26h 38m
American Airlines
Deal found 11/5$1,604
Mon 8/616:20
GEG
-
SYD
1 stop21h 30m
Delta
Mon 15/609:15
SYD
-
GEG
1 stop23h 33m
Delta
Deal found 7/5$1,650
Mon 1/619:05
BOI
-
SYD
1 stop19h 50m
Air New Zealand
Thu 11/610:20
SYD
-
BOI
1 stop22h 24m
Air New Zealand
Deal found 11/5$1,670
Mon 1/619:05
BOI
-
SYD
1 stop19h 50m
United Airlines
Fri 31/710:20
SYD
-
BOI
1 stop18h 48m
United Airlines
Deal found 11/5$1,672
Mon 1/617:40
BOI
-
SYD
2 stops21h 25m
American Airlines
Fri 31/717:50
SYD
-
BOI
2 stops20h 56m
American Airlines
Deal found 11/5$1,673
Mon 12/1014:51
GEG
-
SYD
1 stop23h 14m
Qantas Airways
Fri 16/1013:00
SYD
-
GEG
1 stop25h 47m
Qantas Airways
Deal found 7/5$1,688
Sat 22/816:26
GEG
-
SYD
1 stop22h 04m
Qantas Airways
Wed 2/912:00
SYD
-
GEG
1 stop25h 42m
Qantas Airways
Deal found 8/5$1,692

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 12 May 2026.

Round-trip from

$1,570

One-way from

$892

Popular in

December

Cheapest in

March

Average price

$1,818
Qantas Airways
  • Qantas Airways
  • 29/10-2/11
  • 3 total stops
  • 67h 49m total
  • Idaho to Sydney
Search Deals
Qantas Airways
  • Qantas Airways
  • 7/10
  • 1 total stop
  • 24h 10m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($250 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($35 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 12 May 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

Mon 8/6

16:20-06:50

1 stop21h 30m

Sydney Kingsford Smith

Mon 15/6

09:15-15:48

1 stop23h 33m

$1,650

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 1/6

19:05-06:55

1 stop19h 50m

Sydney Kingsford Smith

Fri 31/7

10:20-13:08

1 stop18h 48m

$1,672

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 1/11

16:47-06:10

1 stop18h 23m

Sydney Kingsford Smith

Sat 21/11

14:05-20:55

1 stop25h 50m

$1,692
Fastest return journey

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 5/6

19:25-06:55

1 stop18h 30m

Sydney Kingsford Smith

Fri 12/6

10:20-10:27

1 stop17h 07m

$1,698

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 29/10

05:00-07:00

2 stops32h 00m

Sydney Kingsford Smith

Mon 2/11

12:10-11:24

1 stop18h 14m

$1,699

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 1/11

05:00-07:00

2 stops31h 00m

Sydney Kingsford Smith

Sat 21/11

12:10-11:24

1 stop18h 14m

$1,699

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 31/7

19:25-06:55

1 stop18h 30m

Sydney Kingsford Smith

Fri 21/8

10:20-15:06

2 stops21h 46m

$1,706

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 18/10

18:57-08:05

1 stop20h 08m

Sydney Kingsford Smith

Tue 3/11

11:15-13:44

1 stop20h 29m

$1,801

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 18/10

14:31-08:00

2 stops24h 29m

Sydney Kingsford Smith

Tue 3/11

12:10-21:16

2 stops27h 06m

$1,815

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 19/10

12:29-08:00

2 stops26h 31m

Sydney Kingsford Smith

Tue 3/11

12:10-17:55

2 stops23h 45m

$1,815

Flights are sorted by cheapest return flights first.

Deals found on 9/5

Showing 1-10 of 21 resultsSorted by cheapest first
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2
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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

How much does it cost for a return flight from Idaho to Sydney?

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 19h 50m. 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
Terrigal
Lithgow
Manly
Cronulla
Bondi Beach
Leura
Randwick
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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