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$444+ Cheap flights from Idaho to Sydney (SYD)

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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
nov. 28 — dec. 51
vr 11/28
vr 12/5
1 adult, Economy
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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 oktober 29, 2025.

This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 11/412:45 pmGEG - SYD
1 stop25h 30mUnited Airlines
ma 11/1712:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 10/27$861
This oojo deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 10/277:00 amGEG - SYD
1 stop32h 00mMultiple Airlines
ma 11/35:45 pmSYD - GEG
1 stop23h 38mMultiple Airlines
Deal found 10/26$863
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 10/275:10 amGEG - SYD
2 stops31h 50mUnited Airlines
ma 11/312:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 10/26$865
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 11/112:45 pmGEG - SYD
1 stop26h 30mUnited Airlines
vr 11/712:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 10/28$877
This Jetabroad deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 10/305:00 amGEG - SYD
2 stops20h 45mHawaiian Airlines
za 11/19:40 pmSYD - GEG
2 stops30h 55mHawaiian Airlines
Deal found 10/26$1,029
This FlightHub deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 10/3012:33 pmGEG - SYD
1 stop24h 22mQantas Airways
za 11/111:20 amSYD - GEG
1 stop20h 38mQantas Airways
Deal found 10/26$1,097
This American Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
zo 11/97:00 amBOI - SYD
1 stop29h 55mAmerican Airlines
wo 11/122:05 pmSYD - BOI
1 stop26h 27mAmerican Airlines
Deal found 10/29$1,148
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 11/263:54 pmBOI - SYD
1 stop22h 36mDelta
wo 12/310:40 amSYD - BOI
1 stop22h 33mDelta
Deal found 10/29$1,163
This Alaska Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
zo 11/28:21 amGEG - SYD
2 stops40h 24mAlaska Airlines
zo 11/99:40 pmSYD - GEG
2 stops20h 35mAlaska Airlines
Deal found 10/28$1,176
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 11/85:55 pmBOI - SYD
2 stops44h 35mDelta
wo 11/1210:40 amSYD - BOI
2 stops27h 44mDelta
Deal found 10/29$1,181
This Qantas Airways deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 10/3012:33 pmGEG - SYD
2 stops27h 17mMultiple Airlines
za 11/11:05 pmSYD - GEG
1 stop23h 41mMultiple Airlines
Deal found 10/26$1,211
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 11/62:40 pmBOI - SYD
1 stop24h 35mUnited Airlines
zo 11/911:20 amSYD - BOI
1 stop20h 10mUnited Airlines
Deal found 10/29$1,213

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 oktober 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$859
(oojo)

One-way from

$444
(United Airlines)

Popular in

January

Cheapest in

September

Average price

$1,131
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Sydney Kingsford Smith flights.
Search Deals
From Idaho to Sydney Kingsford Smith
Search Deals
One-way flight from Idaho to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($137 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated oktober 29, 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

di 11/4

12:45 pm-9:15 am

1 stop25h 30m

Sydney Kingsford Smith

ma 11/17

12:10 pm-10:42 am

1 stop17h 32m

$861

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

za 11/1

1:47 pm-9:05 am

2 stops25h 18m

Sydney Kingsford Smith

vr 11/7

12:10 pm-10:42 am

1 stop17h 32m

$877

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

wo 11/26

3:54 pm-8:30 am

1 stop22h 36m

Sydney Kingsford Smith

wo 12/3

10:40 am-3:13 pm

1 stop22h 33m

$1,163

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

zo 11/2

8:21 am-7:45 pm

2 stops40h 24m

Sydney Kingsford Smith

zo 11/9

9:40 pm-11:15 pm

2 stops20h 35m

$1,176

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

za 11/8

5:55 pm-8:30 am

2 stops44h 35m

Sydney Kingsford Smith

wo 11/12

10:40 am-8:24 pm

2 stops27h 44m

$1,181

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

zo 11/9

2:40 pm-9:15 am

1 stop24h 35m

Sydney Kingsford Smith

za 11/15

12:10 pm-1:44 pm

1 stop19h 34m

$1,213

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

di 11/4

2:38 pm-8:30 am

1 stop22h 52m

Sydney Kingsford Smith

ma 11/17

10:40 am-2:05 pm

1 stop22h 25m

$1,213

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

do 11/6

7:00 pm-9:15 am

1 stop20h 15m

Sydney Kingsford Smith

ma 11/10

11:20 am-1:30 pm

1 stop20h 10m

$1,213

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

ma 11/10

7:00 pm-9:15 am

1 stop20h 15m

Sydney Kingsford Smith

vr 11/14

12:10 pm-4:03 pm

1 stop21h 53m

$1,213

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

ma 11/10

7:00 pm-9:15 am

1 stop20h 15m

Sydney Kingsford Smith

za 11/15

12:10 pm-6:54 pm

1 stop24h 44m

$1,213

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 26 results
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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 round-trip 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 $886). Flying from Idaho to Sydney in July is currently the most expensive (average of $1,456). 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.

What is the cheapest time of day to fly from ID to SYD?

Find hourly flight availability from Idaho to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated oktober 29, 2025.

One of the essential ways to save on airfare from Idaho to Sydney is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 28% on airfare.

How much does it cost to fly round-trip 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?

    If you book a flight to Sydney from Idaho, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 4.6 mi from the center of Sydney.

  • How long is the flight from Idaho to Sydney?

    A quick flight from Idaho to Sydney can take about 22h 36m. United Airlines provides one of the quickest options available for as low as $1,163. Idaho and Sydney are separated by a distance of 7894 mi. This flight may include one or multiple 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 vacation 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 $886). Flying from Idaho to Sydney in July is currently the most expensive (average of $1,456). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

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Top airline flying from Idaho to Sydney

Discover the top airline that operate flights from Idaho to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated oktober 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$898Average$1,195FlexibilityNo cancel feeOn-time69%

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