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$571+ 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
nov. 22 — nov. 291
sáb. 11/22
sáb. 11/29
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 octubre 23, 2025.

This Jetabroad deal was found by Cheapflights users on 10/22. 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.
sáb. 12/65:45 amBOI - SYD
2 stops20h 00mHawaiian Airlines
sáb. 12/139:40 pmSYD - BOI
2 stops30h 54mHawaiian Airlines
Deal found 10/22$1,160
This Alaska Airlines deal was found by Cheapflights users on 10/22. 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.
jue. 10/236:00 amBOI - SYD
2 stops20h 45mAlaska Airlines
jue. 10/309:40 pmSYD - BOI
2 stops28h 44mAlaska Airlines
Deal found 10/22$1,203
This United Airlines deal was found by Cheapflights users on 10/22. 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.
mar. 12/306:55 pmBOI - SYD
1 stop20h 20mUnited Airlines
dom. 2/1512:10 pmSYD - BOI
1 stop17h 22mUnited Airlines
Deal found 10/22$1,231
This American Airlines deal was found by Cheapflights users on 10/22. 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.
sáb. 12/66:44 amBOI - SYD
1 stop30h 11mAmerican Airlines
sáb. 12/132:05 pmSYD - BOI
1 stop26h 16mAmerican Airlines
Deal found 10/22$1,254
This American Airlines deal was found by Cheapflights users on 10/23. 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.
vie. 10/245:20 pmBOI - SYD
2 stops21h 45mAmerican Airlines
vie. 10/3111:20 amSYD - BOI
2 stops25h 17mAmerican Airlines
Deal found 10/23$1,256
This Expedia deal was found by Cheapflights users on 10/21. 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.
vie. 12/58:25 amBOI - SYD
1 stop27h 45mMultiple Airlines
vie. 12/1211:20 amSYD - BOI
1 stop19h 53mMultiple Airlines
Deal found 10/21$1,278
This Jetabroad deal was found by Cheapflights users on 10/21. 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.
vie. 12/55:45 amBOI - SYD
2 stops20h 00mHawaiian Airlines
vie. 12/129:40 pmSYD - BOI
2 stops32h 58mHawaiian Airlines
Deal found 10/21$1,333
This Delta deal was found by Cheapflights users on 10/22. 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.
jue. 10/234:00 pmBOI - SYD
1 stop22h 35mDelta
jue. 10/309:40 amSYD - BOI
1 stop22h 25mDelta
Deal found 10/22$1,347

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 octubre 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,078
(Alaska Airlines)

One-way from

$571
(American 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.
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. 9% potential increase in price ($137 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 octubre 23, 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

jue. 2/26

11:54 am-7:45 pm

2 stops37h 51m

Sydney Kingsford Smith

jue. 3/12

9:40 pm-9:35 pm

2 stops40h 55m

$1,147

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

sáb. 12/6

5:45 am-7:45 pm

2 stops20h 00m

Sydney Kingsford Smith

sáb. 12/13

9:40 pm-10:34 am

2 stops30h 54m

$1,160

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

lun. 2/2

7:05 pm-9:30 am

1 stop20h 55m

Adelaide

sáb. 2/21

2:55 pm-11:38 pm

1 stop26h 13m

$1,211

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

sáb. 2/28

6:00 am-7:45 pm

2 stops19h 45m

Sydney Kingsford Smith

mar. 3/10

9:40 pm-1:45 pm

2 stops33h 05m

$1,211

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

mar. 12/30

2:10 pm-6:20 am

1 stop22h 10m

Sydney Kingsford Smith

dom. 2/15

2:00 pm-9:11 pm

1 stop25h 11m

$1,231

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

lun. 2/2

7:02 pm-9:25 am

3 stops44h 53m

Adelaide

sáb. 2/21

7:00 pm-10:59 pm

3 stops45h 29m

$2,061

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

vie. 11/7

7:00 am-6:55 am

1 stop29h 55m

$571

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

vie. 11/7

2:11 pm-9:05 am

1 stop24h 54m

$581

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

vie. 11/7

8:41 am-6:00 pm

3 stops39h 19m

$1,588

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

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 octubre 23, 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 octubre 23, 2025.
Peruse reviews from past customers who have flown with United 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
8,995 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,995 reviews
United Airlines
7.4
Good
8,995 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

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. The time it takes to get you to your destination can typically vary by up to 17h 51m. 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 airline flying from Boise to Australia

Discover the top airline 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 octubre 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$872Average$1,286FlexibilityNo cancel feeOn-time69%

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