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$527+ Cheap flights from Idaho to Australia

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 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Jan 9 — Jan 161
Fri 1/9
Fri 1/16
1 adult, Economy
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Cheap flight deals from Idaho to Australia

Cheapest flights from Idaho to Australia
Explore the most affordable flight options available from Idaho to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

This United Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/104:10 pmGEG - SYD
2 stops43h 50mUnited Airlines
Wed 12/1712:10 pmSYD - GEG
1 stop25h 34mUnited Airlines
Deal found 12/9$1,112
This Delta deal was found by Cheapflights users on 12/8. 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 12/301:00 pmBOI - SYD
2 stops25h 30mDelta
Sun 2/1510:40 amSYD - BOI
2 stops27h 30mDelta
Deal found 12/8$1,275
This United Airlines deal was found by Cheapflights users on 12/9. 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 stop22h 10mUnited Airlines
Sun 2/152:00 pmSYD - BOI
1 stop25h 11mUnited Airlines
Deal found 12/9$1,573
This Jetabroad deal was found by Cheapflights users on 12/8. 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.
Fri 12/125:45 amBOI - SYD
2 stops20h 00mHawaiian Airlines
Sun 12/149:40 pmSYD - BOI
2 stops29h 40mHawaiian Airlines
Deal found 12/8$2,101
This United Airlines deal was found by Cheapflights users on 12/8. 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.
Fri 12/1210:35 amBOI - SYD
1 stop25h 45mUnited Airlines
Sun 12/148:30 amSYD - BOI
2 stops33h 14mUnited Airlines
Deal found 12/8$2,182
This Cathay Pacific deal was found by Cheapflights users on 12/9. 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 12/1012:25 pmGEG - SYD
2 stops47h 50mMultiple Airlines
Wed 12/1711:45 amSYD - GEG
3 stops47h 24mMultiple Airlines
Deal found 12/9$2,375
This AranGrant deal was found by Cheapflights users on 12/9. 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 AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/105:17 amGEG - SYD
1 stop30h 38mQantas Airways
Wed 12/178:10 pmSYD - GEG
2 stops38h 59mQantas Airways
Deal found 12/9$2,663
This Qantas Airways deal was found by Cheapflights users on 12/8. 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.
Fri 12/122:20 pmBOI - SYD
1 stop21h 50mMultiple Airlines
Sun 12/149:25 pmSYD - BOI
1 stop18h 33mMultiple Airlines
Deal found 12/8$2,827
This Justfly.com deal was found by Cheapflights users on 12/8. 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.
Fri 12/121:17 pmBOI - SYD
2 stops31h 33mQantas Airways
Sun 12/145:45 pmSYD - BOI
2 stops47h 20mQantas Airways
Deal found 12/8$2,918
This Air Tahiti Nui deal was found by Cheapflights users on 12/9. 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 Air Tahiti Nui is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:15 amBOI - SYD
3 stops43h 35mMultiple Airlines
Sun 2/158:55 amSYD - BOI
3 stops45h 49mMultiple Airlines
Deal found 12/9$3,381

Find flight deals from Idaho to Australia

Keep the following information in mind while searching for Idaho to Australia flight deals. Data was last updated December 10, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$862
(Qantas Airways)

One-way from

$527
(Delta)

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 Australia
Search Deals
One-way flight from Idaho to Australia
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($139 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($21 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 Australia 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 10, 2025.
Use the filters below to find and compare flights from Idaho to Australia that are best for you.

Fly from

Idaho

Fly to

Australia

Route

Depart

Return

Price

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 3/23

5:41 pm-9:00 am

1 stop21h 19m

Sydney Kingsford Smith

Tue 4/21

5:50 pm-10:38 pm

1 stop21h 48m

$862

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 4/12

5:41 pm-7:05 am

1 stop20h 24m

Sydney Kingsford Smith

Thu 4/30

5:50 pm-10:38 pm

1 stop21h 48m

$864

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 4/12

3:50 pm-7:30 am

2 stops22h 40m

Sydney Kingsford Smith

Thu 4/30

5:50 pm-10:56 pm

2 stops22h 06m

$868

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 1/24

5:00 am-9:05 am

2 stops33h 05m

Sydney Kingsford Smith

Sat 1/31

12:10 pm-10:44 am

1 stop17h 34m

$879

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 1/22

5:00 am-9:05 am

2 stops33h 05m

Sydney Kingsford Smith

Thu 1/29

11:50 am-9:22 pm

2 stops28h 32m

$883

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 1/22

5:00 am-9:15 am

2 stops33h 15m

Sydney Kingsford Smith

Thu 2/5

12:10 pm-7:16 pm

1 stop26h 06m

$883

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 2/5

1:48 pm-9:15 am

2 stops24h 27m

Sydney Kingsford Smith

Fri 2/13

11:20 am-3:16 pm

2 stops22h 56m

$883

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 2/11

4:10 pm-7:00 am

2 stops43h 50m

Sydney Kingsford Smith

Fri 2/20

2:00 pm-9:07 pm

1 stop26h 07m

$884

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 2/12

1:44 pm-9:05 am

2 stops24h 21m

Sydney Kingsford Smith

Fri 2/20

11:20 am-9:52 pm

2 stops29h 32m

$884

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 2/12

7:00 am-7:00 am

2 stops29h 00m

Sydney Kingsford Smith

Thu 2/19

12:10 pm-11:45 am

1 stop18h 35m

$884

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 37 results
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Best time to book a flight from Idaho to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia 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 Australia

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

Currently, September is the cheapest month in which you can book a flight from Idaho to Australia (average of $886). Flying from Idaho to Australia 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 AU?

Find hourly flight availability from Idaho to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 10, 2025.

It’s typically best to fly out from Idaho to Australia in the afternoon. Doing so could potentially save you 41% on the flight price compared to flying in the morning, which is usually more expensive.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho to Australia?

    There are many flights that can get you from Idaho to Australia in 21h 19m. Fly via Qantas Airways, American Airlines, or United Airlines to get the fastest option. The distance from Idaho to Australia is about 7951 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • Can I find deals for flights from Idaho to Australia that include hotel bookings?

    Yes. In addition to deals on Idaho to Australia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Australia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Australia.

  • Can I find deals for business class flights from Idaho to Australia?

    Yes. Cheapflights offers flight deals from Idaho to Australia 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 Australia?

    Currently, September is the cheapest month in which you can book a flight from Idaho to Australia (average of $886). Flying from Idaho to Australia 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

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Top 2 airlines flying from Idaho to Australia

Discover the top 2 airlines that operate flights from Idaho to Australia. 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 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$864Average$1,082FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$898Average$1,321FlexibilityNo cancel feeOn-time69%

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