HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Australia

$427+ 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 3/15. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Oct 18 — Oct 251
Sat 10/18
Sat 10/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho to Australia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 18, 2025.

Round-trip from

$879
(United Airlines)

One-way from

$427
(United Airlines)

Popular in

January

Cheapest in

September

Average price

$967
From Idaho to Australia
Search Deals
One-way flight from Idaho to Australia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($131 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 18, 2025.

This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/3012:45 pmGEG - SYD
1 stop26h 30mUnited Airlines
Thu 11/612:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/15$879
This United Airlines deal was found by Cheapflights users on 9/17. 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 11/112:45 pmGEG - SYD
1 stop26h 30mUnited Airlines
Sat 11/812:10 pmSYD - GEG
1 stop30h 19mUnited Airlines
Deal found 9/17$886
This United Airlines deal was found by Cheapflights users on 9/16. 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
2 stops27h 35mUnited Airlines
Deal found 9/16$916
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 12/11:47 pmGEG - SYD
2 stops24h 18mUnited Airlines
Sat 12/612:10 pmSYD - GEG
1 stop25h 34mUnited Airlines
Deal found 9/15$961
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3012:45 pmGEG - BNE
1 stop24h 45mUnited Airlines
Thu 11/611:40 amBNE - GEG
1 stop17h 02mUnited Airlines
Deal found 9/14$978
This United Airlines deal was found by Cheapflights users on 9/15. 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 12/2311:59 pmGEG - BNE
2 stops61h 31mUnited Airlines
Fri 1/911:40 amBNE - GEG
1 stop17h 04mUnited Airlines
Deal found 9/15$999
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/241:38 pmBOI - SYD
2 stops25h 27mAmerican Airlines
Sat 10/49:10 amSYD - BOI
2 stops26h 52mAmerican Airlines
Deal found 9/15$1,025
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sun 11/912:45 pmGEG - BNE
1 stop24h 45mUnited Airlines
Mon 11/2411:40 amBNE - GEG
1 stop17h 02mUnited Airlines
Deal found 9/15$1,068
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 9/205:15 amGEG - SYD
2 stops32h 40mUnited Airlines
Sat 9/2710:20 amSYD - GEG
1 stop17h 19mUnited Airlines
Deal found 9/15$1,123
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/28:50 pmBOI - SYD
2 stops28h 55mAlaska Airlines
Sat 11/159:40 pmSYD - BOI
2 stops35h 32mAlaska Airlines
Deal found 9/15$1,132
This Trip.com deal was found by Cheapflights users on 9/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:08 amBOI - ADL
2 stops35h 37mMultiple Airlines
Thu 11/61:15 pmADL - BOI
2 stops27h 17mMultiple Airlines
Deal found 9/14$1,155
This Jetabroad deal was found by Cheapflights users on 9/16. 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 10/315:54 amBOI - SYD
2 stops20h 51mHawaiian Airlines
Fri 11/79:40 pmSYD - BOI
2 stops32h 56mHawaiian Airlines
Deal found 9/16$1,193

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 18, 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

Sat 11/1

4:05 pm-9:05 am

2 stops23h 00m

Sydney Kingsford Smith

Sat 11/8

12:10 pm-10:42 am

1 stop17h 32m

$879

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 10/30

1:47 pm-9:15 am

2 stops25h 28m

Sydney Kingsford Smith

Thu 11/6

11:20 am-3:21 pm

2 stops23h 01m

$883

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 11/4

4:05 pm-7:00 am

2 stops67h 55m

Sydney Kingsford Smith

Mon 11/17

12:10 pm-10:42 am

1 stop17h 32m

$916

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 10/29

12:45 pm-9:15 am

1 stop26h 30m

Sydney Kingsford Smith

Wed 11/5

12:10 pm-10:42 am

1 stop17h 32m

$919

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 3/15

2:05 pm-9:15 am

1 stop25h 10m

Sydney Kingsford Smith

Mon 3/23

12:10 pm-1:09 pm

1 stop18h 59m

$919

SpokaneBrisbane

GEG - BNE

GEGBNE

Spokane

Thu 10/30

12:45 pm-6:30 am

1 stop24h 45m

Brisbane

Thu 11/6

11:40 am-10:42 am

1 stop17h 02m

$978

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 9/24

1:38 pm-7:05 am

2 stops25h 27m

Sydney Kingsford Smith

Sat 10/4

9:10 am-8:02 pm

2 stops26h 52m

$1,025

SpokaneBrisbane

GEG - BNE

GEGBNE

Spokane

Sun 11/9

1:47 pm-7:30 am

2 stops23h 43m

Brisbane

Mon 11/24

11:40 am-8:45 pm

2 stops27h 05m

$1,073

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 11/2

8:50 pm-7:45 pm

2 stops28h 55m

Sydney Kingsford Smith

Sat 11/15

9:40 pm-3:12 pm

2 stops35h 32m

$1,132

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Thu 10/30

8:08 am-12:15 pm

2 stops35h 37m

Adelaide

Thu 11/6

1:15 pm-11:02 pm

2 stops27h 17m

$1,155

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 33 results
1
2
3
4

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, March is the cheapest month in which you can book a flight from Idaho to Australia (average of $1,032). Flying from Idaho to Australia in December is currently the most expensive (average of $1,627). 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 18, 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 23h. Fly via United Airlines, American Airlines, or Alaska 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, March is the cheapest month in which you can book a flight from Idaho to Australia (average of $1,032). Flying from Idaho to Australia in December is currently the most expensive (average of $1,627). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to Australia

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
Los Angeles to Melbourne flights
Los Angeles to Auckland flights
San Francisco to Sydney flights
San Francisco to Auckland flights
John F Kennedy Intl to Melbourne flights
John F Kennedy Intl to Auckland flights
Dallas/Fort Worth to Sydney flights
John F Kennedy Intl to Sydney flights
Newark to Melbourne flights
Newark to Sydney flights
Los Angeles to Papeete flights
LaGuardia to Sydney flights
Dallas/Fort Worth to Auckland flights
Los Angeles to Brisbane flights
Hobby to Sydney flights
Seattle to Sydney flights
San Francisco to Melbourne flights
Seattle to Auckland flights
Ontario to Sydney flights
Santa Ana to Sydney flights
George Bush Intcntl to Sydney flights
Dallas/Fort Worth to Melbourne flights
LaGuardia to Melbourne flights
Newark to Auckland flights
LaGuardia to Auckland flights
Dulles Intl to Sydney flights
Salt Lake City to Christchurch flights
O'Hare Intl to Melbourne flights
O'Hare Intl to Sydney flights
Boston to Sydney flights
Boston to Auckland flights
Ontario to Auckland flights
Seattle to Melbourne flights
Reagan-National to Sydney flights
Santa Ana to Auckland flights
Baltimore to Sydney flights
Salt Lake City to Queenstown flights
San Francisco to Papeete flights
Ontario to Melbourne flights
O'Hare Intl to Auckland flights
Los Angeles to Avalon flights
Dulles Intl to Auckland flights
Dallas/Fort Worth to Brisbane flights
Denver to Auckland flights
Baltimore to Auckland flights
John F Kennedy Intl to Avalon flights
Minneapolis to Sydney flights
Los Angeles to Nadi flights
Honolulu to Sydney flights

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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$872Average$1,342FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$987Average$1,296FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.