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Cheap flights from Idaho to Sydney from $1,339

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
25 Dec — 1 Jan1
1 adult
1 adult, Economy, 0 bags

Find 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 25 November 2025.

Tue 30/1214:10BOI - SYD
1 stop25h 05mUnited Airlines
Sun 15/212:10SYD - BOI
1 stop27h 01mUnited Airlines
Deal found 23/11$2,338
Tue 30/1214:08BOI - SYD
1 stop22h 42mDelta
Sun 15/210:40SYD - BOI
2 stops30h 25mDelta
Deal found 23/11$2,346
Thu 27/1114:11BOI - SYD
2 stops26h 19mAir New Zealand
Sat 29/1119:15SYD - BOI
2 stops36h 29mAir New Zealand
Deal found 23/11$2,669
Mon 24/1114:21BOI - SYD
2 stops24h 39mAmerican Airlines
Mon 1/1211:20SYD - BOI
2 stops23h 35mAmerican Airlines
Deal found 23/11$2,790
Mon 24/1109:59BOI - SYD
2 stops27h 26mMultiple Airlines
Mon 1/1217:45SYD - BOI
1 stop23h 03mMultiple Airlines
Deal found 23/11$2,807
Wed 24/1207:15BOI - SYD
1 stop30h 10mMultiple Airlines
Wed 31/1217:45SYD - BOI
1 stop23h 17mMultiple Airlines
Deal found 24/11$2,973
Wed 24/1210:42BOI - SYD
2 stops28h 23mUnited Airlines
Wed 31/1211:20SYD - BOI
2 stops28h 11mUnited Airlines
Deal found 24/11$3,121
Mon 22/1218:55BOI - SYD
1 stop20h 20mAir New Zealand
Mon 29/1209:55SYD - BOI
2 stops30h 35mAir New Zealand
Deal found 24/11$3,448
Mon 22/1217:23BOI - SYD
2 stops21h 37mAmerican Airlines
Mon 29/1211:20SYD - BOI
2 stops23h 33mAmerican Airlines
Deal found 24/11$3,480

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 25 November 2025.

Round-trip from

$1,364

Popular in

December

Cheapest in

September

Average price

$2,109
Delta
  • Delta
  • 8/3-11/3
  • 3 total stops
  • 54h 03m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($343 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($53 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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 25 November 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

Sun 8/2

15:02-09:00

2 stops22h 58m

Sydney Kingsford Smith

Fri 20/2

17:45-23:12

2 stops24h 27m

$1,339

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 2/5

15:50-07:05

2 stops22h 15m

Sydney Kingsford Smith

Sat 9/5

17:45-22:56

2 stops22h 11m

$1,339

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 2/5

12:30-06:55

1 stop25h 25m

Sydney Kingsford Smith

Sat 9/5

10:20-11:24

1 stop18h 04m

$1,356

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 8/3

06:30-06:05

1 stop29h 35m

Sydney Kingsford Smith

Wed 11/3

09:40-16:08

2 stops24h 28m

$1,364

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 6/5

13:30-06:35

2 stops24h 05m

Sydney Kingsford Smith

Sun 10/5

09:25-14:06

1 stop21h 41m

$1,364

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 8/2

05:00-06:20

2 stops30h 20m

Sydney Kingsford Smith

Fri 20/2

14:00-21:07

1 stop26h 07m

$1,395

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 3/2

13:48-09:05

2 stops24h 17m

Sydney Kingsford Smith

Sat 21/2

11:50-21:17

2 stops28h 27m

$1,395

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 21/1

14:20-09:15

1 stop24h 55m

Sydney Kingsford Smith

Wed 11/2

12:10-21:23

1 stop27h 13m

$1,796

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 25/2

13:44-09:15

1 stop25h 31m

Sydney Kingsford Smith

Mon 16/3

12:10-21:13

1 stop26h 03m

$1,796

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 25/2

10:53-06:20

1 stop25h 27m

Sydney Kingsford Smith

Tue 17/3

14:00-23:57

1 stop26h 57m

$1,796

Flights are sorted by cheapest return flights first.

Deals found on 21/11

Showing 1-10 of 18 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, September is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,372). Flying from Idaho to Sydney in July is currently the most expensive (average of $2,254). 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.

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 22h 58m. 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, September is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,372). Flying from Idaho to Sydney in July is currently the most expensive (average of $2,254). 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
Terrigal
Manly
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

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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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