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$426+ 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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Sep 7 — Sep 141
Sun 9/7
Sun 9/14
1 adult, Economy
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Cheap flight deals from Idaho to Australia

Keep the following information in mind while searching for Idaho to Australia flight deals. Data was last updated September 2, 2025.

Round-trip from

$877
(United Airlines)

One-way from

$426
(United Airlines)

Popular in

January

Cheapest in

May

Average price

$1,056
From Idaho to Australia
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One-way flight from Idaho to Australia
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Highest demand for flights based on searches. 12% potential increase in price ($179 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 2, 2025.

This United Airlines deal was found by Cheapflights users on 9/1. 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.
Thu 10/2312:35 pmGEG - SYD
1 stop25h 20mUnited Airlines
Thu 11/612:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/1$877
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Thu 10/2312:35 pmGEG - SYD
1 stop25h 20mUnited Airlines
Tue 11/412:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/1$897
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Thu 10/231:38 pmGEG - SYD
2 stops24h 17mUnited Airlines
Mon 11/312:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/1$901
This United Airlines deal was found by Cheapflights users on 8/31. 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 11/44:05 pmGEG - SYD
2 stops67h 55mUnited Airlines
Mon 11/1712:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 8/31$914
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Sun 10/2612:45 pmGEG - SYD
1 stop26h 30mUnited Airlines
Tue 11/412:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/1$917
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Sun 10/264:05 pmGEG - SYD
2 stops23h 00mUnited Airlines
Mon 11/312:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/1$921
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Sun 10/265:10 amGEG - SYD
2 stops33h 55mUnited Airlines
Wed 11/512:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/2$922
This United Airlines deal was found by Cheapflights users on 8/31. 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 11/512:45 pmGEG - SYD
1 stop25h 30mUnited Airlines
Wed 11/1912:10 pmSYD - GEG
1 stop30h 19mUnited Airlines
Deal found 8/31$924
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Sat 9/2712:35 pmGEG - BNE
1 stop24h 55mUnited Airlines
Sat 10/410:30 amBNE - GEG
1 stop17h 09mUnited Airlines
Deal found 9/1$977
This Trip.com deal was found by Cheapflights users on 8/31. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:00 amBOI - SYD
2 stops31h 05mMultiple Airlines
Fri 10/39:10 amSYD - BOI
2 stops24h 08mMultiple Airlines
Deal found 8/31$1,013
This American Airlines deal was found by Cheapflights users on 8/31. 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.
Mon 9/221:38 pmBOI - SYD
1 stop25h 17mAmerican Airlines
Fri 10/312:10 pmSYD - BOI
1 stop25h 38mAmerican Airlines
Deal found 8/31$1,020
This Delta deal was found by Cheapflights users on 9/1. 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.
Wed 10/292:38 pmGEG - SYD
1 stop22h 52mDelta
Sun 11/210:40 amSYD - GEG
1 stop22h 18mDelta
Deal found 9/1$1,041

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 September 2, 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

Thu 2/5

12:24 pm-6:20 am

1 stop22h 56m

Sydney Kingsford Smith

Thu 2/12

12:10 pm-1:09 pm

1 stop19h 59m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 10/23

12:35 pm-7:55 am

1 stop25h 20m

Sydney Kingsford Smith

Thu 11/6

12:10 pm-10:42 am

1 stop17h 32m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 10/25

12:35 pm-9:15 am

1 stop26h 40m

Sydney Kingsford Smith

Sat 11/8

12:10 pm-10:42 am

1 stop17h 32m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 10/23

12:35 pm-7:55 am

1 stop25h 20m

Sydney Kingsford Smith

Sat 11/8

12:10 pm-10:42 am

1 stop17h 32m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 10/24

12:35 pm-7:55 am

1 stop25h 20m

Sydney Kingsford Smith

Sat 11/8

12:10 pm-10:42 am

1 stop17h 32m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 10/25

12:35 pm-9:15 am

1 stop26h 40m

Sydney Kingsford Smith

Thu 11/6

12:10 pm-10:42 am

1 stop17h 32m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 10/23

12:35 pm-7:55 am

1 stop25h 20m

Sydney Kingsford Smith

Fri 11/7

12:10 pm-10:42 am

1 stop17h 32m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 1/31

12:24 pm-9:15 am

1 stop25h 51m

Sydney Kingsford Smith

Thu 2/12

2:00 pm-1:09 pm

1 stop18h 09m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 1/30

12:24 pm-6:20 am

1 stop22h 56m

Sydney Kingsford Smith

Thu 2/12

12:10 pm-1:09 pm

1 stop19h 59m

$877

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 10/24

12:35 pm-7:55 am

1 stop25h 20m

Sydney Kingsford Smith

Thu 11/6

12:10 pm-10:42 am

1 stop17h 32m

$877

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/31

Showing 1-10 of 36 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, February is the cheapest month in which you can book a flight from Idaho to Australia (average of $1,030). Flying from Idaho to Australia in December is currently the most expensive (average of $1,615). 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 September 2, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to Australia as you normally would.

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 22h 56m. Fly via United Airlines, American Airlines, or ANA 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, February is the cheapest month in which you can book a flight from Idaho to Australia (average of $1,030). Flying from Idaho to Australia in December is currently the most expensive (average of $1,615). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Idaho to Australia

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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 September 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$872Average$1,344FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$987Average$1,296FlexibilityNo cancel feeOn-time71%

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