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$1,160+ Cheap flights from Boise (BOI) to Australia

This is the cheapest round-trip 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
Dec 25 — Jan 11
Thu 12/25
Thu 1/1
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 25, 2025.

This Delta deal was found by Cheapflights users on 11/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:40 amBOI - SYD
2 stops28h 10mDelta
Sun 2/1510:40 amSYD - BOI
2 stops23h 35mDelta
Deal found 11/25$1,505
This United Airlines deal was found by Cheapflights users on 11/24. 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 11/24$1,510
This American Airlines deal was found by Cheapflights users on 11/23. 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.
Mon 11/242:21 pmBOI - SYD
2 stops24h 39mAmerican Airlines
Mon 12/111:20 amSYD - BOI
2 stops23h 35mAmerican Airlines
Deal found 11/23$1,802
This Kiwi.com deal was found by Cheapflights users on 11/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/249:59 amBOI - SYD
2 stops27h 26mMultiple Airlines
Mon 12/15:45 pmSYD - BOI
1 stop23h 03mMultiple Airlines
Deal found 11/23$1,813
This Kiwi.com deal was found by Cheapflights users on 11/24. 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.
Wed 12/247:15 amBOI - SYD
1 stop30h 10mMultiple Airlines
Wed 12/315:45 pmSYD - BOI
1 stop23h 17mMultiple Airlines
Deal found 11/24$1,920
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/2410:42 amBOI - SYD
2 stops28h 23mUnited Airlines
Wed 12/3111:20 amSYD - BOI
2 stops28h 11mUnited Airlines
Deal found 11/24$2,016
This Ovago deal was found by Cheapflights users on 11/24. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/226:55 pmBOI - SYD
1 stop20h 20mAir New Zealand
Mon 12/299:55 amSYD - BOI
2 stops30h 35mAir New Zealand
Deal found 11/24$2,227
This American Airlines deal was found by Cheapflights users on 11/24. 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 12/225:23 pmBOI - SYD
2 stops21h 37mAmerican Airlines
Mon 12/2911:20 amSYD - BOI
2 stops23h 33mAmerican Airlines
Deal found 11/24$2,248
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/226:55 pmBOI - SYD
1 stop20h 20mUnited Airlines
Mon 12/292:00 pmSYD - BOI
1 stop20h 08mUnited Airlines
Deal found 11/24$2,260

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 25, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,160
(United Airlines)

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
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 25, 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

Wed 1/21

2:20 pm-9:15 am

1 stop24h 55m

Sydney Kingsford Smith

Wed 2/11

12:10 pm-9:23 pm

1 stop27h 13m

$1,160

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 3/14

12:59 pm-9:15 am

1 stop27h 16m

Sydney Kingsford Smith

Sat 3/21

12:10 pm-4:49 pm

1 stop21h 39m

$1,260

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 2/28

8:12 pm-9:00 am

1 stop18h 48m

Sydney Kingsford Smith

Wed 3/4

11:20 am-12:44 pm

1 stop19h 24m

$1,315

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 2/20

8:16 am-7:25 am

1 stop29h 09m

Sydney Kingsford Smith

Sun 2/22

2:00 pm-11:00 pm

2 stops27h 00m

$1,330

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 2/28

10:41 am-8:30 am

2 stops27h 49m

Sydney Kingsford Smith

Wed 3/4

10:40 am-12:01 pm

2 stops19h 21m

$1,351

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 2/13

1:36 pm-6:55 am

1 stop23h 19m

Sydney Kingsford Smith

Mon 2/16

2:05 pm-10:36 pm

1 stop26h 31m

$1,385

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 1/10

5:40 am-7:45 pm

2 stops20h 05m

Sydney Kingsford Smith

Sun 1/18

9:40 pm-12:54 pm

2 stops33h 14m

$1,429

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 12/30

8:40 am-6:50 am

2 stops28h 10m

Sydney Kingsford Smith

Sun 2/15

10:40 am-4:15 pm

2 stops23h 35m

$1,505

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Tue 2/10

2:20 pm-10:55 am

2 stops27h 05m

Adelaide

Sat 2/14

7:50 am-8:55 pm

2 stops30h 35m

$2,073

BoiseAdelaide

BOI - ADL

BOIADL

Boise Air Term. Gowen Fld

Tue 2/10

2:20 pm-2:10 pm

2 stops30h 20m

Adelaide

Sat 2/14

2:55 pm-11:38 pm

1 stop26h 13m

$2,671

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

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 25, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 44% on flights from Boise to Australia by exploring options for tickets in the afternoon.

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 25, 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
9,046 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
9,046 reviews
United Airlines
7.4
Good
9,046 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
11,038 reviews
United Airlines
7.4
Good
9,046 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

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 and Air New Zealand fly from Boise to Australia in about 24h 55m. The time it takes to get you to your destination can typically vary by up to 2h 10m. 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

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 November 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$864Average$1,082FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$872Average$1,294FlexibilityNo cancel feeOn-time69%

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