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Cheap flights from Idaho to Sydney from $640

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 15/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Idaho to Sydney

Keep the following information in mind while searching for Idaho to Sydney flight deals. Data was last updated 18 September 2025.

Round-trip from

$1,318

One-way from

$640

Popular in

January

Cheapest in

September

Average price

$1,449
United Airlines
  • United Airlines
  • 30/10-6/11
  • 3 total stops
  • 42h 50m total
  • Idaho to Sydney
Search Deals
United Airlines
  • United Airlines
  • 15/3
  • 1 total stop
  • 25h 10m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($295 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($55 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from Idaho to Sydney

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 18 September 2025.

Sat 1/1116:05GEG - SYD
2 stops23h 00mUnited Airlines
Sat 8/1112:10SYD - GEG
1 stop17h 32mUnited Airlines
Deal found 17/9$1,318
Tue 4/1116:05GEG - SYD
2 stops67h 55mUnited Airlines
Mon 17/1112:10SYD - GEG
2 stops27h 35mUnited Airlines
Deal found 16/9$1,373
Mon 1/1212:45GEG - SYD
1 stop25h 30mUnited Airlines
Sat 6/1212:10SYD - GEG
1 stop18h 42mUnited Airlines
Deal found 15/9$1,440
Wed 24/913:38BOI - SYD
2 stops25h 27mAmerican Airlines
Sat 4/1009:10SYD - BOI
2 stops26h 52mAmerican Airlines
Deal found 15/9$1,536
Sat 20/914:35GEG - SYD
1 stop23h 00mDelta
Sat 27/909:25SYD - GEG
2 stops26h 15mDelta
Deal found 17/9$1,571
Thu 2/1013:38GEG - SYD
2 stops24h 22mUnited Airlines
Wed 8/1011:20SYD - GEG
2 stops27h 04mUnited Airlines
Deal found 17/9$1,656
Fri 31/1005:54BOI - SYD
2 stops20h 51mHawaiian Airlines
Fri 7/1121:40SYD - BOI
2 stops32h 56mHawaiian Airlines
Deal found 16/9$1,788
Sat 20/912:35GEG - SYD
1 stop25h 20mQantas Airways
Sat 27/917:45SYD - GEG
1 stop21h 40mQantas Airways
Deal found 17/9$1,790
Wed 24/920:27BOI - SYD
1 stop18h 38mAlaska Airlines
Sat 4/1009:10SYD - BOI
2 stops30h 47mAlaska Airlines
Deal found 15/9$1,836
Fri 31/1019:00BOI - SYD
1 stop21h 15mUnited Airlines
Fri 7/1112:10SYD - BOI
1 stop21h 53mUnited Airlines
Deal found 16/9$1,905
Tue 30/1215:40BOI - SYD
2 stops22h 50mDelta
Sun 15/210:40SYD - BOI
2 stops29h 25mDelta
Deal found 17/9$1,946
Wed 24/919:09BOI - SYD
1 stop19h 46mUnited Airlines
Sat 4/1010:20SYD - BOI
1 stop24h 55mUnited Airlines
Deal found 15/9$1,953

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 18 September 2025.
Use the filters below to find and compare flights from Idaho to Sydney that are best for you.

Fly from

Idaho

Fly to

Sydney

Route

Depart

Return

Price

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 1/11

16:05-09:05

2 stops23h 00m

Sydney Kingsford Smith

Sat 8/11

12:10-10:42

1 stop17h 32m

$1,318

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 30/10

13:47-09:15

2 stops25h 28m

Sydney Kingsford Smith

Thu 6/11

11:20-15:21

2 stops23h 01m

$1,324

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 4/11

16:05-07:00

2 stops67h 55m

Sydney Kingsford Smith

Mon 17/11

12:10-10:42

1 stop17h 32m

$1,373

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 29/10

12:45-09:15

1 stop26h 30m

Sydney Kingsford Smith

Wed 5/11

12:10-10:42

1 stop17h 32m

$1,378

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 15/3

14:05-09:15

1 stop25h 10m

Sydney Kingsford Smith

Mon 23/3

12:10-13:09

1 stop18h 59m

$1,378

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 31/10

19:00-09:15

1 stop21h 15m

Sydney Kingsford Smith

Fri 7/11

12:10-16:03

1 stop21h 53m

$1,905

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 30/12

15:40-08:30

2 stops22h 50m

Sydney Kingsford Smith

Sun 15/2

10:40-22:05

2 stops29h 25m

$1,946

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 26/1

14:37-09:05

2 stops24h 28m

Sydney Kingsford Smith

Fri 30/1

11:20-19:51

1 stop26h 31m

$1,953

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 1/10

14:12-07:00

1 stop24h 48m

Sydney Kingsford Smith

Wed 8/10

11:20-16:58

1 stop22h 38m

$2,001

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 30/12

18:55-09:15

1 stop20h 20m

Sydney Kingsford Smith

Sun 15/2

12:10-16:31

1 stop22h 21m

$2,001

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 19 results
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

What is the cheapest month to book a flight from Idaho to Sydney?

Currently, May is the cheapest month in which you can book a flight from Idaho to Sydney (average of $129). Flying from Idaho to Sydney in October is currently the most expensive (average of $171). 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.

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 22h 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.

  • What is the cheapest month to book a flight from Idaho to Sydney?

    Currently, May is the cheapest month in which you can book a flight from Idaho to Sydney (average of $129). Flying from Idaho to Sydney in October is currently the most expensive (average of $171). 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 Sydney?

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

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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 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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