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$1,016+ Cheap flights from Boise (BOI) to Sydney (SYD)

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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Aug 21 — Aug 281
Thu 8/21
Thu 8/28
1 adult, Economy
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Cheap flight deals from Boise to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 16, 2025.

Round-trip from

$1,016
(American Airlines)

Popular in

January

Cheapest in

May

Average price

$1,207
From Boise Air Term. Gowen Fld to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($179 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Boise to Sydney

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

This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/192:06 pmBOI - SYD
2 stops24h 54mAmerican Airlines
Wed 2/1811:15 amSYD - BOI
2 stops23h 36mAmerican Airlines
Deal found 8/14$1,016
This Delta deal was found by Cheapflights users on 8/15. 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.
Thu 9/113:45 pmBOI - SYD
1 stop22h 50mDelta
Tue 9/169:25 amSYD - BOI
1 stop21h 39mDelta
Deal found 8/15$1,082
This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/115:22 pmBOI - SYD
2 stops21h 43mAmerican Airlines
Tue 9/169:10 amSYD - BOI
2 stops26h 52mAmerican Airlines
Deal found 8/14$1,111
This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/162:06 pmBOI - SYD
2 stops24h 54mAmerican Airlines
Sun 2/152:20 pmSYD - BOI
1 stop24h 49mAmerican Airlines
Deal found 8/14$1,142
This FlightHub deal was found by Cheapflights users on 8/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/192:11 pmBOI - SYD
2 stops37h 34mAir New Zealand
Wed 2/1811:45 amSYD - BOI
2 stops28h 37mAir New Zealand
Deal found 8/15$1,144
This Delta deal was found by Cheapflights users on 8/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:15 pmBOI - SYD
2 stops23h 35mDelta
Sun 2/1510:40 amSYD - BOI
2 stops31h 41mDelta
Deal found 8/14$1,182
This Delta deal was found by Cheapflights users on 8/15. 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.
Sun 11/163:05 pmBOI - SYD
1 stop23h 25mDelta
Sun 2/1510:40 amSYD - BOI
2 stops27h 33mDelta
Deal found 8/15$1,188

Cheapflights Fare Finder

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

Fly from

Boise

Fly to

Sydney

Route

Depart

Return

Price

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 11/19

2:06 pm-9:00 am

2 stops24h 54m

Sydney Kingsford Smith

Wed 2/18

11:15 am-4:51 pm

2 stops23h 36m

$1,016

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 11/17

2:11 pm-9:05 am

1 stop24h 54m

Sydney Kingsford Smith

Sat 11/22

11:20 am-1:30 pm

1 stop20h 10m

$1,082

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 9/11

3:45 pm-6:35 am

1 stop22h 50m

Sydney Kingsford Smith

Tue 9/16

9:25 am-3:04 pm

1 stop21h 39m

$1,082

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 12/1

3:05 pm-8:30 am

1 stop23h 25m

Sydney Kingsford Smith

Sat 2/28

2:15 pm-11:04 pm

1 stop26h 49m

$1,082

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 2/3

10:40 am-9:15 am

1 stop28h 35m

Sydney Kingsford Smith

Sat 2/21

11:20 am-1:30 pm

1 stop20h 10m

$1,082

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 11/16

3:05 pm-8:30 am

1 stop23h 25m

Sydney Kingsford Smith

Sat 11/22

10:40 am-2:27 pm

1 stop21h 47m

$1,082

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 11/17

5:40 am-8:30 am

2 stops32h 50m

Sydney Kingsford Smith

Sat 11/22

10:40 am-4:52 pm

2 stops24h 12m

$1,087

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 1/6

3:45 pm-11:30 am

3 stops49h 45m

$1,887

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 1/6

6:48 am-10:30 am

2 stops33h 42m

$4,192

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/15

Best time to book a flight from Boise to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney

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

Currently, February is the cheapest month in which you can book a flight from Boise to Sydney (average of $1,031). Flying from Boise to Sydney in December is currently the most expensive (average of $1,619). 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 SYD?

Find hourly flight availability from Boise to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 16, 2025.

When flying from Boise to Sydney, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 15% versus a flight in the evening.

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated August 16, 2025.
Read reviews from past customers who have flown United Airlines and American Airlines from Boise to Sydney. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,916 reviews

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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
8,916 reviews

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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 Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Boise to Sydney round-trip?

    Cheapflights users have booked flights from Boise to Sydney round-trip from $898. Another airline that can offer you cheap pricing is American Airlines. You may be able to fly from Boise to Sydney for 31% less than the average price by searching for these airlines.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Boise to Sydney (average of $1,031). Flying from Boise to Sydney in December is currently the most expensive (average of $1,619). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Wollongong
Parramatta
Manly
Coogee

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Boise to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Spokane to Sydney flights

Top 2 airlines flying from Boise to Sydney

Discover the top 2 airlines that operate flights from Boise to Sydney. 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 August 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$898Average$1,171FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$987Average$1,296FlexibilityNo cancel feeOn-time71%

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