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$1,153+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Jun 9 — Jun 161
Tue 6/9
Tue 6/16
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 May 10, 2026.

This American Airlines deal was found by Cheapflights users on 5/7. 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 5/102:14 pm
BOI
-
SYD
2 stops24h 11m
American Airlines
Sun 5/249:10 am
SYD
-
BOI
2 stops23h 59m
American Airlines
Deal found 5/7$1,153
This United Airlines deal was found by Cheapflights users on 5/7. 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.
Sun 5/1012:30 pm
BOI
-
SYD
1 stop26h 25m
United Airlines
Sun 5/2410:20 am
SYD
-
BOI
1 stop22h 24m
United Airlines
Deal found 5/7$1,157
This United Airlines deal was found by Cheapflights users on 5/6. 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 5/206:58 pm
BOI
-
SYD
1 stop19h 57m
United Airlines
Wed 6/1710:20 am
SYD
-
BOI
1 stop22h 24m
United Airlines
Deal found 5/6$1,160
This American Airlines deal was found by Cheapflights users on 5/6. 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 8/1112:17 pm
BOI
-
SYD
1 stop26h 38m
American Airlines
Tue 8/185:50 pm
SYD
-
BOI
2 stops20h 50m
American Airlines
Deal found 5/6$1,161
This oojo deal was found by Cheapflights users on 5/8. 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.
Sun 10/186:57 pm
BOI
-
SYD
1 stop20h 08m
Qantas Airways
Tue 11/311:15 am
SYD
-
BOI
1 stop20h 29m
Qantas Airways
Deal found 5/8$1,275
This Qantas Airways deal was found by Cheapflights users on 5/8. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:57 pm
BOI
-
SYD
2 stops24h 28m
Multiple Airlines
Tue 11/311:15 am
SYD
-
BOI
1 stop20h 29m
Multiple Airlines
Deal found 5/8$1,295
This Expedia deal was found by Cheapflights users on 5/5. 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.
Tue 9/86:47 pm
BOI
-
SYD
1 stop20h 18m
Alaska Airlines
Sat 9/199:10 am
SYD
-
BOI
1 stop19h 23m
Alaska Airlines
Deal found 5/5$1,296
This Qantas Airways deal was found by Cheapflights users on 5/6. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:57 pm
BOI
-
SYD
1 stop20h 08m
Multiple Airlines
Tue 11/311:15 am
SYD
-
BOI
1 stop20h 29m
Multiple Airlines
Deal found 5/6$1,305
This United Airlines deal was found by Cheapflights users on 5/6. 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 10/197:05 pm
BOI
-
SYD
1 stop19h 50m
United Airlines
Tue 11/312:10 pm
SYD
-
BOI
1 stop22h 39m
United Airlines
Deal found 5/6$1,310
This KAYAK deal was found by Cheapflights users on 5/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/182:45 pm
BOI
-
SYD
1 stop24h 10m
Air New Zealand
Tue 11/311:50 am
SYD
-
BOI
2 stops24h 05m
Air New Zealand
Deal found 5/6$1,314

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 May 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,157
(American Airlines)

Popular in

December

Cheapest in

March

Average price

$1,317
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. 1% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 10, 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
Quickest round-trip

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 9/8

6:47 pm-7:05 am

1 stop20h 18m

Sydney Kingsford Smith

Sat 9/19

9:10 am-12:33 pm

1 stop19h 23m

$1,296

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 10/18

6:57 pm-8:05 am

1 stop20h 08m

Sydney Kingsford Smith

Tue 11/3

11:15 am-1:44 pm

1 stop20h 29m

$1,305

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 10/19

12:29 pm-8:00 am

2 stops26h 31m

Sydney Kingsford Smith

Tue 11/3

12:10 pm-5:55 pm

2 stops23h 45m

$1,315

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 10/18

2:31 pm-8:00 am

2 stops24h 29m

Sydney Kingsford Smith

Tue 11/3

12:10 pm-4:49 pm

1 stop22h 39m

$1,316

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 10/26

6:57 pm-12:25 pm

2 stops24h 28m

Sydney Kingsford Smith

Tue 11/3

10:20 am-1:44 pm

2 stops21h 24m

$1,345

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 9/8

6:47 pm-7:05 am

1 stop20h 18m

Sydney Kingsford Smith

Sat 9/19

3:45 pm-11:00 pm

2 stops23h 15m

$1,354

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 9/8

1:15 pm-6:50 am

2 stops25h 35m

Sydney Kingsford Smith

Sat 9/19

9:15 am-8:18 pm

2 stops27h 03m

$1,365

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 5/20

3:23 pm-6:50 am

1 stop23h 27m

Sydney Kingsford Smith

Sat 5/23

9:15 am-2:34 pm

1 stop21h 19m

$1,499

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 10/28

6:55 pm-9:15 am

1 stop21h 20m

Sydney Kingsford Smith

Sun 11/1

12:10 pm-8:16 pm

1 stop25h 06m

$1,500

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/5

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 May.
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.

Cheapflights Insights

Everything you need to know about your flight from Boise to Sydney

How much does it cost to fly round-trip from Boise to Sydney?

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 May 10, 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
9,695 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,695 reviews
United Airlines
7.4
Good
9,695 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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 20h 08m. 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 $1,214. You may be able to fly from Boise to Sydney for 5% 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

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Alternative routes for Boise to Sydney

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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 May 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,214Average$1,452FlexibilityNo cancel feeOn-time69%

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