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$583+ Cheap flights from Boise (BOI) 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Boise to Australia

Keep the following information in mind while searching for Boise to Australia flight deals. Data was last updated September 16, 2025.

Round-trip from

$1,132
(Alaska Airlines)

One-way from

$583
(United Airlines)

Popular in

January

Cheapest in

September

Average price

$967
From Boise Air Term. Gowen Fld to Australia
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One-way flight from Boise Air Term. Gowen Fld to Australia
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Highest demand for flights based on searches. 9% potential increase in price ($131 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($24 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 Boise to Australia

Cheapest flights from Boise to Australia
Explore the most affordable flight options available from Boise to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

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 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
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.
Wed 9/248:27 pmBOI - SYD
1 stop18h 38mAlaska Airlines
Sat 10/49:10 amSYD - BOI
2 stops30h 47mAlaska Airlines
Deal found 9/15$1,225
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/26:05 pmBOI - SYD
2 stops45h 45mMultiple Airlines
Sat 11/155:45 pmSYD - BOI
1 stop37h 55mMultiple Airlines
Deal found 9/15$1,261
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.
Fri 10/317:00 pmBOI - SYD
1 stop21h 15mUnited Airlines
Fri 11/712:10 pmSYD - BOI
1 stop21h 53mUnited Airlines
Deal found 9/16$1,271
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.
Wed 9/247:09 pmBOI - SYD
1 stop19h 46mUnited Airlines
Sat 10/410:20 amSYD - BOI
1 stop24h 55mUnited Airlines
Deal found 9/15$1,303
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 12/308:30 amBOI - SYD
1 stop27h 50mUnited Airlines
Sun 2/1512:10 pmSYD - BOI
1 stop22h 21mUnited Airlines
Deal found 9/15$1,335
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:10 amBOI - SYD
2 stops25h 40mDelta
Sun 2/1510:40 amSYD - BOI
2 stops23h 46mDelta
Deal found 9/15$1,339
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/186:00 amBOI - SYD
2 stops21h 45mAlaska Airlines
Sat 9/209:40 pmSYD - BOI
2 stops38h 10mAlaska Airlines
Deal found 9/14$1,389

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boise 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 16, 2025.
Use the filters below to find and compare flights from Boise to Australia that are best for you.

Fly from

Boise

Fly to

Australia

Route

Depart

Return

Price

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

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 10/31

5:54 am-7:45 pm

2 stops20h 51m

Sydney Kingsford Smith

Fri 11/7

9:40 pm-12:36 pm

2 stops32h 56m

$1,193

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 11/2

6:05 pm-9:50 am

2 stops45h 45m

Sydney Kingsford Smith

Sat 11/15

5:45 pm-1:40 pm

1 stop37h 55m

$1,261

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 10/31

7:00 pm-9:15 am

1 stop21h 15m

Sydney Kingsford Smith

Fri 11/7

12:10 pm-4:03 pm

1 stop21h 53m

$1,271

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 12/30

2:10 pm-6:20 am

1 stop22h 10m

Sydney Kingsford Smith

Sun 2/15

2:00 pm-11:37 pm

1 stop27h 37m

$1,335

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 12/30

5:50 am-6:50 am

2 stops31h 00m

Sydney Kingsford Smith

Sun 2/15

10:40 am-4:53 pm

2 stops24h 13m

$1,339

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Mon 2/2

7:25 am-10:55 am

2 stops34h 00m

Adelaide

Sat 2/21

5:10 pm-9:11 pm

2 stops45h 31m

$1,391

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Mon 2/2

7:05 pm-9:30 am

1 stop20h 55m

Adelaide

Sat 2/21

2:55 pm-9:16 pm

2 stops23h 51m

$1,393

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Wed 2/11

5:16 pm-9:30 am

2 stops46h 44m

Adelaide

Sun 2/15

8:30 am-4:31 pm

2 stops25h 31m

$1,714

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 12 results
1
2

Best time to book a flight from Boise to Australia

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

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

Currently, March is the cheapest month in which you can book a flight from Boise to Australia (average of $1,032). Flying from Boise 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 BOI to AU?

Find hourly flight availability from Boise 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 16, 2025.

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

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Australia. Reviews last updated September 16, 2025.
Peruse reviews from past customers who have flown with United Airlines and American Airlines from Boise to Australia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,924 reviews

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,924 reviews
United Airlines
7.4
Good
8,924 reviews

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,924 reviews

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Boise to Australia. 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 from for flights from Boise to Australia?

    Most people fly from Boise Air Term. Gowen Fld (BOI) if they book a flight from Boise to Australia. Boise Air Term. Gowen Fld is conveniently located just 3.3 mi from Boise’s city center.

  • How long is the flight from Boise to Australia?

    Airlines like Alaska Airlines, Hawaiian Airlines, and United Airlines fly from Boise to Australia in about 20h 51m. The time it takes to get you to your destination can typically vary by up to 8h 04m. The distance from Boise to Australia is about 7894 mi. This flight may include one or multiple stops.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Boise to Australia (average of $1,032). Flying from Boise 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.

Top 2 airlines flying from Boise to Australia

Discover the top 2 airlines that operate flights from Boise 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$872Average$1,294FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$987Average$1,296FlexibilityNo cancel feeOn-time71%

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