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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 30/10. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
3 Sep — 10 Sep1
1 adult

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 29 August 2025.

Round-trip from

$1,343

One-way from

$892

Popular in

January

Cheapest in

May

Average price

$1,850
United Airlines
  • United Airlines
  • 8/11-15/11
  • 3 total stops
  • 41h 50m total
  • Idaho to Sydney
Search Deals
Delta
  • Delta
  • 30/10
  • 1 total stop
  • 22h 30m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($419 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($65 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

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 29 August 2025.

Sat 8/1113:47GEG - SYD
2 stops24h 18mUnited Airlines
Sat 15/1112:10SYD - GEG
1 stop17h 32mUnited Airlines
Deal found 28/8$1,343
Sat 27/912:35GEG - SYD
1 stop25h 20mUnited Airlines
Sat 4/1009:30SYD - GEG
2 stops27h 54mUnited Airlines
Deal found 28/8$1,350
Fri 21/1116:05GEG - SYD
2 stops46h 00mUnited Airlines
Fri 28/1111:50SYD - GEG
2 stops27h 55mUnited Airlines
Deal found 29/8$1,370
Tue 4/1116:05GEG - SYD
2 stops67h 55mUnited Airlines
Mon 17/1111:50SYD - GEG
2 stops27h 55mUnited Airlines
Deal found 27/8$1,401
Tue 30/913:57BOI - SYD
2 stops25h 08mAmerican Airlines
Tue 7/1010:10SYD - BOI
2 stops26h 27mAmerican Airlines
Deal found 28/8$1,491
Fri 31/1013:47GEG - SYD
2 stops25h 18mUnited Airlines
Sun 2/1112:10SYD - GEG
1 stop17h 32mUnited Airlines
Deal found 28/8$1,594
Sat 27/914:35GEG - SYD
1 stop23h 00mDelta
Sat 4/1009:25SYD - GEG
1 stop21h 30mDelta
Deal found 28/8$1,596
Tue 4/1114:38GEG - SYD
1 stop22h 52mDelta
Mon 17/1110:40SYD - GEG
2 stops29h 21mDelta
Deal found 27/8$1,602
Fri 26/913:57BOI - SYD
2 stops25h 33mAmerican Airlines
Fri 3/1012:10SYD - BOI
1 stop25h 38mAmerican Airlines
Deal found 27/8$1,646
Sun 12/1007:00GEG - SYD
2 stops33h 35mMultiple Airlines
Sun 26/1007:45SYD - GEG
2 stops48h 00mMultiple Airlines
Deal found 27/8$1,703
Wed 19/1114:11BOI - SYD
2 stops37h 34mAir New Zealand
Wed 18/209:55SYD - BOI
2 stops30h 27mAir New Zealand
Deal found 27/8$1,749
Mon 27/1014:11BOI - SYD
2 stops25h 34mMultiple Airlines
Sun 2/1119:15SYD - BOI
2 stops45h 47mMultiple Airlines
Deal found 28/8$1,758

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 29 August 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 8/11

13:47-09:05

2 stops24h 18m

Sydney Kingsford Smith

Sat 15/11

12:10-10:42

1 stop17h 32m

$1,343

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 27/9

12:35-06:55

1 stop25h 20m

Sydney Kingsford Smith

Sat 4/10

09:30-20:24

2 stops27h 54m

$1,350

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 21/11

16:05-09:05

2 stops46h 00m

Sydney Kingsford Smith

Fri 28/11

11:50-20:45

2 stops27h 55m

$1,370

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

$1,401

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 30/9

13:57-07:05

2 stops25h 08m

Sydney Kingsford Smith

Tue 7/10

10:10-19:37

2 stops26h 27m

$1,491

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 26/9

13:57-07:30

2 stops25h 33m

Sydney Kingsford Smith

Fri 3/10

12:10-21:48

1 stop25h 38m

$1,646

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 19/11

14:11-21:45

2 stops37h 34m

Sydney Kingsford Smith

Wed 18/2

09:55-22:22

2 stops30h 27m

$1,749

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 27/10

14:11-08:45

2 stops25h 34m

Sydney Kingsford Smith

Sun 2/11

19:15-23:02

2 stops45h 47m

$1,758

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 30/9

20:27-07:05

1 stop18h 38m

Sydney Kingsford Smith

Tue 7/10

10:10-23:05

2 stops29h 55m

$1,798

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 30/12

07:15-08:45

2 stops31h 30m

Sydney Kingsford Smith

Sun 15/2

13:55-21:08

2 stops25h 13m

$1,865

Flights are sorted by cheapest return flights first.

Deals found on 27/8

Showing 1-10 of 14 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 24h 18m. Airlines will cover a distance of 12796 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
Coogee
Terrigal
Cronulla
Manly
Lithgow
Randwick
Bondi Beach
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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