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$1,249+ 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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,183
(Alaska 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.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Sydney Kingsford Smith flights.
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From Boise Air Term. Gowen Fld to Sydney Kingsford Smith
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Highest demand for flights based on searches. 10% potential increase in price ($144 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Thu 12/41:25 pmBOI - SYD
2 stops24h 00mMultiple Airlines
Thu 12/185:45 pmSYD - BOI
1 stop23h 17mMultiple Airlines
Deal found 11/11$1,373
This Alaska Airlines deal was found by Cheapflights users on 11/11. 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.
Thu 12/48:20 pmBOI - SYD
2 stops29h 25mAlaska Airlines
Thu 12/189:40 pmSYD - BOI
2 stops30h 27mAlaska Airlines
Deal found 11/11$1,463
This United Airlines deal was found by Cheapflights users on 11/12. 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 11/12$1,511
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 12/17:44 amBOI - SYD
1 stop29h 41mMultiple Airlines
Mon 12/155:45 pmSYD - BOI
2 stops23h 11mMultiple Airlines
Deal found 11/12$1,575
This American Airlines deal was found by Cheapflights users on 11/12. 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 12/17:00 amBOI - SYD
1 stop29h 55mAmerican Airlines
Mon 12/152:05 pmSYD - BOI
1 stop26h 20mAmerican Airlines
Deal found 11/12$1,646
This United Airlines deal was found by Cheapflights users on 11/12. 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 12/110:39 amBOI - SYD
2 stops28h 26mUnited Airlines
Mon 12/1512:10 pmSYD - BOI
2 stops25h 33mUnited Airlines
Deal found 11/12$1,666
This Jetabroad deal was found by Cheapflights users on 11/10. 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.
Sun 12/72:20 pmBOI - SYD
2 stops26h 10mMultiple Airlines
Fri 12/1911:20 amSYD - BOI
1 stop20h 08mMultiple Airlines
Deal found 11/10$1,691
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Thu 12/41:50 pmBOI - SYD
1 stop25h 15mUnited Airlines
Thu 12/1812:10 pmSYD - BOI
1 stop27h 20mUnited Airlines
Deal found 11/11$1,761
This American Airlines deal was found by Cheapflights users on 11/10. 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 12/71:25 pmBOI - SYD
1 stop23h 30mAmerican Airlines
Fri 12/192:05 pmSYD - BOI
1 stop25h 57mAmerican Airlines
Deal found 11/10$1,799

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 November 13, 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

Mon 1/26

12:37 pm-9:00 am

2 stops26h 23m

Sydney Kingsford Smith

Mon 2/2

11:20 am-5:07 pm

2 stops23h 47m

$1,249

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 5/6

1:00 pm-6:35 am

1 stop25h 35m

Sydney Kingsford Smith

Sun 5/10

9:25 am-3:01 pm

1 stop21h 36m

$1,347

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 1/26

7:05 pm-9:15 am

1 stop20h 10m

Sydney Kingsford Smith

Mon 2/2

11:20 am-7:51 pm

1 stop26h 31m

$1,361

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 12/4

1:25 pm-7:25 am

2 stops24h 00m

Sydney Kingsford Smith

Thu 12/18

5:45 pm-11:02 pm

1 stop23h 17m

$1,373

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 2/22

1:25 pm-8:05 am

2 stops48h 40m

$3,699

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 2/22

8:16 am-7:25 am

1 stop29h 09m

$4,100

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 1/2

3:45 pm-6:35 pm

3 stops56h 50m

$9,634

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 1/2

7:00 am-9:00 am

2 stops32h 00m

$12,607

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Boise-Sydney flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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

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

Currently, September is the cheapest month in which you can book a flight from Boise to Sydney (average of $886). Flying from Boise to Sydney 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 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 November 13, 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 14% versus a flight in the evening.

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 November 13, 2025.
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
9,017 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

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
9,017 reviews
United Airlines
7.4
Good
9,017 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

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 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 25h 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 $898. You may be able to fly from Boise to Sydney for 26% 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.

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

    Currently, September is the cheapest month in which you can book a flight from Boise to Sydney (average of $886). Flying from Boise to Sydney 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

Traveling to a place near Sydney?

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

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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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$898Average$1,188FlexibilityNo cancel feeOn-time69%

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