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$879+ Cheap flights from Idaho to Sydney (SYD)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap 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 December 15, 2025.

This Justfly.com deal was found by Cheapflights users on 12/14. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:27 pmBOI - SYD
2 stops31h 23mQantas Airways
Sun 2/157:15 pmSYD - BOI
2 stops45h 21mQantas Airways
Deal found 12/14$1,527
This United Airlines deal was found by Cheapflights users on 12/15. 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.
Tue 12/302:10 pmBOI - SYD
1 stop25h 05mUnited Airlines
Sun 2/1512:10 pmSYD - BOI
1 stop17h 07mUnited Airlines
Deal found 12/15$1,573
This Delta deal was found by Cheapflights users on 12/15. 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.
Tue 12/302:08 pmBOI - SYD
1 stop22h 42mDelta
Sun 2/1510:40 amSYD - BOI
2 stops27h 30mDelta
Deal found 12/15$1,578
This Cathay Pacific deal was found by Cheapflights users on 12/15. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:15 amBOI - SYD
3 stops39h 15mMultiple Airlines
Sun 2/1510:20 pmSYD - BOI
2 stops42h 16mMultiple Airlines
Deal found 12/15$2,140
This Jetabroad deal was found by Cheapflights users on 12/13. 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.
Wed 12/175:00 amGEG - SYD
2 stops19h 45mHawaiian Airlines
Fri 12/199:40 pmSYD - GEG
2 stops29h 26mHawaiian Airlines
Deal found 12/13$2,228
This American Airlines deal was found by Cheapflights users on 12/13. 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.
Wed 12/175:17 amGEG - SYD
1 stop30h 38mAmerican Airlines
Fri 12/199:25 pmSYD - GEG
2 stops23h 12mAmerican Airlines
Deal found 12/13$2,721
This Cathay Pacific deal was found by Cheapflights users on 12/13. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/176:25 amGEG - SYD
3 stops42h 00mMultiple Airlines
Fri 12/1910:20 pmSYD - GEG
2 stops43h 33mMultiple Airlines
Deal found 12/13$3,348
This Expedia deal was found by Cheapflights users on 12/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/158:20 pmBOI - SYD
2 stops54h 30mMultiple Airlines
Sun 12/2111:05 amSYD - BOI
2 stops29h 57mMultiple Airlines
Deal found 12/14$23,496

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 December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$872
(KAYAK)

Popular in

December

Cheapest in

September

Average price

$1,459
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
Highest demand for flights based on searches. 10% potential increase in price ($143 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 15, 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

Tue 3/3

6:30 am-6:50 am

1 stop29h 20m

Sydney Kingsford Smith

Tue 3/10

1:15 pm-9:20 pm

1 stop26h 05m

$879

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 4/29

1:30 pm-6:35 am

2 stops24h 05m

Sydney Kingsford Smith

Tue 5/12

9:15 am-11:35 pm

2 stops31h 20m

$884

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 3/4

9:20 am-8:30 am

2 stops28h 10m

Sydney Kingsford Smith

Tue 3/10

9:40 am-4:08 pm

2 stops24h 28m

$884

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 1/28

2:20 pm-6:20 am

1 stop22h 00m

Sydney Kingsford Smith

Wed 2/4

2:00 pm-9:23 pm

1 stop25h 23m

$1,163

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 1/29

7:05 pm-9:15 am

1 stop20h 10m

Sydney Kingsford Smith

Thu 2/5

12:10 pm-9:23 pm

1 stop27h 13m

$1,263

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 1/17

2:20 pm-6:20 am

1 stop22h 00m

Sydney Kingsford Smith

Sat 1/24

11:20 am-7:51 pm

1 stop26h 31m

$1,263

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 2/5

7:02 pm-9:00 am

1 stop19h 58m

Sydney Kingsford Smith

Mon 2/9

11:20 am-1:35 pm

1 stop20h 15m

$1,267

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 1/29

1:00 pm-8:30 am

2 stops25h 30m

Sydney Kingsford Smith

Thu 2/5

2:15 pm-10:18 pm

1 stop26h 03m

$1,268

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 2/5

7:45 am-6:20 am

1 stop28h 35m

Sydney Kingsford Smith

Mon 2/9

2:00 pm-9:23 pm

1 stop25h 23m

$1,403

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 12/22

3:28 pm-7:45 pm

3 stops33h 17m

$965

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 17 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 December 15, 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.

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 19h 58m. Delta provides one of the quickest options available for as low as $1,267. 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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$898Average$1,269FlexibilityNo cancel feeOn-time69%

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