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$444+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
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 October 27, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$852
(United Airlines)

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.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Sydney Kingsford Smith flights.
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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. 9% potential increase in price ($137 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 27, 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.
Tue 11/412:45 pmGEG - SYD
1 stop25h 30mUnited Airlines
Mon 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.
Mon 10/277:00 amGEG - SYD
1 stop32h 00mMultiple Airlines
Mon 11/35:45 pmSYD - GEG
1 stop23h 38mMultiple Airlines
Deal found 10/26$863
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.
Thu 10/305:00 amGEG - SYD
2 stops20h 45mHawaiian Airlines
Sat 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.
Thu 10/3012:33 pmGEG - SYD
1 stop24h 22mQantas Airways
Sat 11/111:20 amSYD - GEG
1 stop20h 38mQantas Airways
Deal found 10/26$1,097
This United Airlines deal was found by Cheapflights users on 10/25. 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 12/105:25 amGEG - SYD
2 stops29h 55mUnited Airlines
Wed 12/1712:10 pmSYD - GEG
2 stops22h 06mUnited Airlines
Deal found 10/25$1,140
This American Airlines deal was found by Cheapflights users on 10/25. 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.
Tue 12/95:17 amGEG - BNE
1 stop31h 13mAmerican Airlines
Tue 12/169:40 amBNE - GEG
1 stop25h 00mAmerican Airlines
Deal found 10/25$1,198
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.
Thu 10/3012:33 pmGEG - SYD
2 stops27h 17mMultiple Airlines
Sat 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 10/27. 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.
Tue 12/302:10 pmBOI - SYD
1 stop22h 10mUnited Airlines
Sun 2/1512:10 pmSYD - BOI
1 stop27h 01mUnited Airlines
Deal found 10/27$1,231
This Jetabroad deal was found by Cheapflights users on 10/25. 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 10/295:54 amBOI - SYD
2 stops20h 51mHawaiian Airlines
Fri 10/319:40 pmSYD - BOI
2 stops31h 56mHawaiian Airlines
Deal found 10/25$1,239
This Orbitz deal was found by Cheapflights users on 10/25. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:58 pmBOI - SYD
1 stop21h 02mMultiple Airlines
Fri 10/319:25 pmSYD - BOI
1 stop17h 43mMultiple Airlines
Deal found 10/25$1,310
This Expedia deal was found by Cheapflights users on 10/25. 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.
Tue 12/96:25 amGEG - BNE
2 stops30h 35mMultiple Airlines
Tue 12/1611:10 amBNE - GEG
2 stops29h 14mMultiple Airlines
Deal found 10/25$1,327
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:54 pmBOI - SYD
1 stop22h 36mDelta
Wed 12/1710:40 amSYD - BOI
1 stop22h 33mDelta
Deal found 10/26$1,347

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 October 27, 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 3/30

6:00 am-7:55 am

1 stop31h 55m

Sydney Kingsford Smith

Wed 4/15

9:30 am-3:19 pm

2 stops22h 49m

$852

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 3/24

1:45 pm-9:05 am

2 stops25h 20m

Sydney Kingsford Smith

Thu 4/16

10:20 am-2:34 pm

1 stop21h 14m

$854

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 3/23

1:45 pm-9:15 am

2 stops25h 30m

Sydney Kingsford Smith

Thu 4/16

10:20 am-9:24 pm

1 stop28h 04m

$855

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 2/10

4:59 pm-6:10 am

1 stop18h 11m

Sydney Kingsford Smith

Thu 2/12

11:20 am-4:09 pm

1 stop23h 49m

$859

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 3/24

12:50 pm-6:10 am

1 stop23h 20m

Sydney Kingsford Smith

Thu 4/16

9:10 am-10:38 pm

1 stop30h 28m

$864

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 3/23

6:40 am-9:00 am

1 stop32h 20m

Sydney Kingsford Smith

Thu 4/16

9:10 am-10:38 pm

1 stop30h 28m

$864

SpokaneBrisbane

GEG - BNE

GEGBNE

Spokane

Sun 3/15

5:41 pm-6:00 pm

2 stops31h 19m

Brisbane

Thu 3/19

8:40 am-8:34 pm

1 stop28h 54m

$1,070

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 2/26

7:00 pm-7:45 pm

2 stops30h 45m

Sydney Kingsford Smith

Sun 3/8

9:40 pm-1:45 pm

2 stops33h 05m

$1,099

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 2/25

9:00 am-7:45 pm

2 stops40h 45m

Sydney Kingsford Smith

Thu 3/12

9:40 pm-9:26 am

2 stops28h 46m

$1,125

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 2/26

7:00 pm-7:45 pm

2 stops30h 45m

Sydney Kingsford Smith

Thu 3/12

9:40 pm-9:26 am

2 stops28h 46m

$1,136

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 45 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 October 27, 2025.

It’s typically best to fly out from Idaho to Australia in the evening. Doing so could potentially save you 29% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Idaho to Australia?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to Australia flight should consider departing on Sunday afternoons when fares are most often at their lowest. Tuesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 30h 45m. Fly via United Airlines, Qantas Airways, or Alaska Airlines to get the fastest option. The distance from Idaho to Australia is about 7894 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 airline flying from Idaho to Australia

Discover the top airline 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 October 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$872Average$1,304FlexibilityNo cancel feeOn-time69%

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