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$714+ 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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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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 November 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Thu 12/41:25 pmBOI - SYD
2 stops24h 00mMultiple Airlines
Thu 12/185:45 pmSYD - BOI
1 stop23h 17mMultiple Airlines
Deal found 11/11$1,373
This Alaska Airlines deal was found by Cheapflights users on 11/11. 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 12/48:20 pmBOI - SYD
2 stops29h 25mAlaska Airlines
Thu 12/189:40 pmSYD - BOI
2 stops30h 27mAlaska Airlines
Deal found 11/11$1,463
This United Airlines deal was found by Cheapflights users on 11/12. 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 2/152:00 pmSYD - BOI
1 stop25h 11mUnited Airlines
Deal found 11/12$1,511
This Kiwi.com deal was found by Cheapflights users on 11/12. 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.
Mon 12/17:44 amBOI - SYD
1 stop29h 41mMultiple Airlines
Mon 12/155:45 pmSYD - BOI
2 stops23h 11mMultiple Airlines
Deal found 11/12$1,575
This American Airlines deal was found by Cheapflights users on 11/12. 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 12/17:00 amBOI - SYD
1 stop29h 55mAmerican Airlines
Mon 12/152:05 pmSYD - BOI
1 stop26h 20mAmerican Airlines
Deal found 11/12$1,646
This United Airlines deal was found by Cheapflights users on 11/12. 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 12/110:39 amBOI - SYD
2 stops28h 26mUnited Airlines
Mon 12/1512:10 pmSYD - BOI
2 stops25h 33mUnited Airlines
Deal found 11/12$1,666
This Jetabroad deal was found by Cheapflights users on 11/10. 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.
Sun 12/72:20 pmBOI - SYD
2 stops26h 10mMultiple Airlines
Fri 12/1911:20 amSYD - BOI
1 stop20h 08mMultiple Airlines
Deal found 11/10$1,691
This United Airlines deal was found by Cheapflights users on 11/11. 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 12/41:50 pmBOI - SYD
1 stop25h 15mUnited Airlines
Thu 12/1812:10 pmSYD - BOI
1 stop27h 20mUnited Airlines
Deal found 11/11$1,761
This American Airlines deal was found by Cheapflights users on 11/10. 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.
Sun 12/71:25 pmBOI - SYD
1 stop23h 30mAmerican Airlines
Fri 12/192:05 pmSYD - BOI
1 stop25h 57mAmerican Airlines
Deal found 11/10$1,799

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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,183
(Alaska Airlines)

One-way from

$714
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,362
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 Boise Air Term. Gowen Fld to Australia
Search Deals
One-way flight from Boise Air Term. Gowen Fld to Australia
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($144 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 13, 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

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Mon 2/2

2:20 pm-9:30 am

1 stop25h 40m

Adelaide

Sat 2/21

2:55 pm-11:38 pm

1 stop26h 13m

$1,211

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 1/26

12:37 pm-9:00 am

2 stops26h 23m

Sydney Kingsford Smith

Mon 2/2

11:20 am-5:07 pm

2 stops23h 47m

$1,249

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 5/6

1:00 pm-6:35 am

1 stop25h 35m

Sydney Kingsford Smith

Sun 5/10

9:25 am-3:01 pm

1 stop21h 36m

$1,347

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 1/26

7:05 pm-9:15 am

1 stop20h 10m

Sydney Kingsford Smith

Mon 2/2

11:20 am-7:51 pm

1 stop26h 31m

$1,361

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 12/4

1:25 pm-7:25 am

2 stops24h 00m

Sydney Kingsford Smith

Thu 12/18

5:45 pm-11:02 pm

1 stop23h 17m

$1,373

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Mon 2/2

12:46 pm-10:55 am

3 stops28h 39m

Adelaide

Sat 2/21

7:00 pm-11:00 pm

3 stops45h 30m

$1,525

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Tue 2/3

7:05 am-7:00 pm

2 stops42h 25m

$714

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Tue 2/3

7:02 pm-5:45 pm

2 stops29h 13m

$861

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 2/22

1:25 pm-8:05 am

2 stops48h 40m

$3,699

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 2/22

8:16 am-7:25 am

1 stop29h 09m

$4,100

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 12 results
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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, September is the cheapest month in which you can book a flight from Boise to Australia (average of $886). Flying from Boise 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 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 November 13, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 38% on flights from Boise to Australia by exploring options for tickets at noon.

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

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

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

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 November 13, 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
9,017 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,017 reviews
United Airlines
7.4
Good
9,017 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
American Airlines
7.2
Good
11,051 reviews
United Airlines
7.4
Good
9,017 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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 United Airlines, American Airlines, and Delta fly from Boise to Australia in about 25h 35m. The time it takes to get you to your destination can typically vary by up to 48m. 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, September is the cheapest month in which you can book a flight from Boise to Australia (average of $886). Flying from Boise 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

Browse thousands of different options on Cheapflights for your next trip

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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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$864Average$1,082FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$872Average$1,294FlexibilityNo cancel feeOn-time69%

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