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$1,140+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Jul 28 — Aug 41
Tue 7/28
Tue 8/4
1 adult, Economy
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Cheap 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 June 28, 2026.

This oojo deal was found by Cheapflights users on 6/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:51 pm
BOI
-
SYD
1 stop20h 39m
Qantas Airways
Tue 8/185:50 pm
SYD
-
BOI
1 stop20h 55m
Qantas Airways
Deal found 6/26$1,140
This United Airlines deal was found by Cheapflights users on 6/28. 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 7/272:00 pm
BOI
-
SYD
1 stop24h 55m
United Airlines
Mon 8/310:20 am
SYD
-
BOI
1 stop27h 20m
United Airlines
Deal found 6/28$1,186
This American Airlines deal was found by Cheapflights users on 6/26. 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.
Tue 8/111:55 pm
BOI
-
SYD
2 stops25h 10m
American Airlines
Tue 8/185:50 pm
SYD
-
BOI
2 stops20h 50m
American Airlines
Deal found 6/26$1,187
This Gotogate deal was found by Cheapflights users on 6/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/410:13 am
BOI
-
SYD
1 stop26h 12m
Multiple Airlines
Wed 11/117:00 am
SYD
-
BOI
2 stops24h 40m
Multiple Airlines
Deal found 6/27$1,196
This United Airlines deal was found by Cheapflights users on 6/26. 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 7/17:00 am
BOI
-
SYD
1 stop32h 00m
United Airlines
Wed 7/159:30 am
SYD
-
BOI
1 stop28h 35m
United Airlines
Deal found 6/26$1,200
This Kiwi.com deal was found by Cheapflights users on 6/23. 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.
Tue 8/186:51 pm
BOI
-
SYD
2 stops24h 59m
Multiple Airlines
Sun 8/235:50 pm
SYD
-
BOI
1 stop34h 43m
Multiple Airlines
Deal found 6/23$1,278
This United Airlines deal was found by Cheapflights users on 6/27. 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 11/411:51 am
BOI
-
SYD
1 stop27h 29m
United Airlines
Wed 11/1111:50 am
SYD
-
BOI
1 stop17h 24m
United Airlines
Deal found 6/27$1,306
This American Airlines deal was found by Cheapflights users on 6/27. 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 11/45:25 pm
BOI
-
SYD
2 stops21h 35m
American Airlines
Wed 11/1111:15 am
SYD
-
BOI
2 stops23h 40m
American Airlines
Deal found 6/27$1,307
This FlightHub deal was found by Cheapflights users on 6/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/302:44 pm
BOI
-
SYD
2 stops24h 36m
Air Canada
Mon 10/510:20 am
SYD
-
BOI
2 stops40h 14m
Air Canada
Deal found 6/25$1,313
This FlightHub deal was found by Cheapflights users on 6/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:30 am
BOI
-
SYD
2 stops32h 50m
Air Canada
Sun 8/239:20 am
SYD
-
BOI
2 stops41h 44m
Air Canada
Deal found 6/23$1,314
This United Airlines deal was found by Cheapflights users on 6/27. 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.
Sat 11/145:44 pm
BOI
-
SYD
2 stops45h 36m
United Airlines
Sun 11/2211:50 am
SYD
-
BOI
1 stop17h 24m
United Airlines
Deal found 6/27$1,326

Find 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 June 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,140
(oojo)

Popular in

November

Cheapest in

March

Average price

$1,315
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 Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($131 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 June 28, 2026.
Use the filters below to find and compare flights from Boise to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 8/11

2:44 pm-6:55 am

2 stops24h 11m

Sydney Kingsford Smith

Tue 8/18

10:20 am-3:31 pm

1 stop21h 11m

$1,186

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 7/27

2:00 pm-6:55 am

1 stop24h 55m

Sydney Kingsford Smith

Mon 8/3

10:20 am-9:40 pm

1 stop27h 20m

$1,186

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 11/4

5:25 pm-9:00 am

2 stops21h 35m

Sydney Kingsford Smith

Wed 11/11

11:15 am-4:55 pm

2 stops23h 40m

$1,307

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 7/30

10:35 am-6:55 am

1 stop28h 20m

Sydney Kingsford Smith

Mon 8/31

10:20 am-9:35 am

2 stops39h 15m

$1,410
Quickest round-trip

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 8/18

6:51 pm-7:05 am

1 stop20h 14m

Sydney Kingsford Smith

Sun 8/23

9:25 pm-10:27 pm

1 stop17h 02m

$1,419

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 9/30

6:47 pm-7:05 am

1 stop20h 18m

Sydney Kingsford Smith

Mon 10/5

10:10 am-12:28 pm

1 stop19h 18m

$1,496

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 10/17

2:35 pm-7:55 am

1 stop24h 20m

Sydney Kingsford Smith

Wed 10/21

11:20 am-1:03 pm

1 stop18h 43m

$1,496

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

Sorted by cheapest first

Compare providers for flights from Boise to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to Sydney in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boise-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boise-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boise-Sydney flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boise-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

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 June 28, 2026.
Read reviews from past customers who have flown United 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
9,899 reviews

Overall

7.4

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
9,899 reviews
United Airlines
7.4
Good
9,899 reviews

Overall

7.4

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

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.

  • How long is the flight from Boise to Sydney?

    Departing from Boise to Sydney will take you 21h 35m. There are 7894 mi between Boise and Sydney. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Boise to Sydney round-trip?

    Cheapflights users have booked flights from Boise to Sydney round-trip from $1,247. You may be able to fly from Boise to Sydney for 4% less than the average price by searching for this airline.

  • 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.

See more FAQs

Traveling to a place near Sydney?

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

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 airline flying from Boise to Sydney

Discover the top airline 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 June 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,247Average$1,454FlexibilityNo cancel feeOn-time69%

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