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$1,090+ 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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
oct. 30 — nov. 61
jeu. 10/30
jeu. 11/6
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 septembre 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,090
(Alaska Airlines)

Popular in

January

Cheapest in

September

Average price

$967
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. 9% potential increase in price ($133 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septembre 30, 2025.

This oojo deal was found by Cheapflights users on 9/29. 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.
mar. 12/21:50 pmBOI - SYD
2 stops26h 40mMultiple Airlines
mar. 12/167:45 amSYD - BOI
2 stops33h 20mMultiple Airlines
Deal found 9/29$1,238
This United Airlines deal was found by Cheapflights users on 9/29. 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.
jeu. 10/232:39 pmBOI - SYD
2 stops24h 21mUnited Airlines
jeu. 11/611:20 amSYD - BOI
2 stops24h 49mUnited Airlines
Deal found 9/29$1,261
This United Airlines deal was found by Cheapflights users on 9/29. 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.
jeu. 11/132:40 pmBOI - SYD
1 stop24h 35mUnited Airlines
jeu. 11/2011:50 amSYD - BOI
2 stops27h 31mUnited Airlines
Deal found 9/29$1,274
This United Airlines deal was found by Cheapflights users on 9/30. 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.
mer. 10/12:12 pmBOI - SYD
1 stop24h 48mUnited Airlines
mer. 10/1511:20 amSYD - BOI
1 stop22h 38mUnited Airlines
Deal found 9/30$1,291
This United Airlines deal was found by Cheapflights users on 9/29. 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.
dim. 11/162:31 pmBOI - SYD
2 stops24h 34mUnited Airlines
mer. 12/311:20 amSYD - BOI
1 stop20h 15mUnited Airlines
Deal found 9/29$1,292
This Delta deal was found by Cheapflights users on 9/30. 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.
mar. 12/301:00 pmBOI - SYD
2 stops23h 50mDelta
dim. 2/1510:40 amSYD - BOI
2 stops27h 33mDelta
Deal found 9/30$1,296
This oojo deal was found by Cheapflights users on 9/29. 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.
mar. 12/21:50 pmBOI - SYD
1 stop25h 15mAir New Zealand
mar. 12/167:45 amSYD - BOI
2 stops47h 50mAir New Zealand
Deal found 9/29$1,346
This Alaska Airlines deal was found by Cheapflights users on 9/29. 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.
mar. 10/78:26 pmBOI - SYD
2 stops30h 19mAlaska Airlines
jeu. 11/69:40 pmSYD - BOI
2 stops20h 14mAlaska Airlines
Deal found 9/29$1,427
This United Airlines deal was found by Cheapflights users on 9/29. 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.
mar. 10/72:39 pmBOI - SYD
2 stops24h 21mUnited Airlines
jeu. 11/611:20 amSYD - BOI
1 stop20h 10mUnited Airlines
Deal found 9/29$1,526
This Alaska Airlines deal was found by Cheapflights users on 9/29. 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.
ven. 10/36:35 amBOI - SYD
2 stops21h 10mAlaska Airlines
dim. 10/59:40 pmSYD - BOI
2 stops42h 16mAlaska Airlines
Deal found 9/29$1,551

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 septembre 30, 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

mer. 2/4

8:05 pm-7:45 pm

2 stops29h 40m

Sydney Kingsford Smith

mar. 2/10

9:40 pm-11:59 pm

2 stops20h 19m

$1,090

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

mer. 2/4

8:05 pm-7:45 pm

2 stops29h 40m

Sydney Kingsford Smith

dim. 2/8

9:40 pm-3:10 pm

2 stops35h 30m

$1,099

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

mer. 2/4

5:55 pm-7:45 pm

2 stops31h 50m

Sydney Kingsford Smith

ven. 2/13

9:40 pm-12:04 pm

2 stops32h 24m

$1,107

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

dim. 2/1

7:02 pm-7:45 pm

2 stops30h 43m

Sydney Kingsford Smith

mar. 2/10

9:40 pm-11:59 pm

2 stops20h 19m

$1,109

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

jeu. 2/5

1:55 pm-7:45 pm

2 stops35h 50m

Sydney Kingsford Smith

ven. 2/13

9:40 pm-12:04 pm

2 stops32h 24m

$1,116

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

dim. 2/1

11:35 am-7:45 pm

2 stops38h 10m

Sydney Kingsford Smith

ven. 2/13

9:40 pm-12:04 pm

2 stops32h 24m

$1,116

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

dim. 2/1

7:02 pm-7:45 pm

2 stops30h 43m

Sydney Kingsford Smith

sam. 2/7

9:40 pm-3:10 pm

2 stops35h 30m

$1,118

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

lun. 2/2

5:40 am-7:45 pm

2 stops20h 05m

Sydney Kingsford Smith

dim. 2/8

9:40 pm-12:51 pm

2 stops33h 11m

$1,126

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

ven. 1/30

3:43 pm-7:45 pm

2 stops34h 02m

Sydney Kingsford Smith

jeu. 2/12

9:40 pm-9:43 am

2 stops30h 03m

$1,157

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

jeu. 2/5

5:55 pm-7:45 pm

2 stops31h 50m

Sydney Kingsford Smith

jeu. 2/12

9:40 pm-12:04 pm

2 stops32h 24m

$1,157

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/30

Showing 1-10 of 11 results
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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 September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice 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

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

Currently, March is the cheapest month in which you can book a flight from Boise to Sydney (average of $1,030). 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 septembre 30, 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 septembre 30, 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
8,931 reviews

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,931 reviews
United Airlines
7.4
Good
8,931 reviews

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,931 reviews

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

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 29h 40m. There are 7894 mi between Boise and Sydney.

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

    Cheapflights users have booked flights from Boise to Sydney round-trip from $955. Another airline that can offer you cheap pricing is American Airlines. You may be able to fly from Boise to Sydney for 25% 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, March is the cheapest month in which you can book a flight from Boise to Sydney (average of $1,030). 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
Parramatta
Wollongong
Manly
Coogee

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Alternative routes for Boise to Sydney

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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 septembre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$955Average$1,184FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$987Average$1,284FlexibilityNo cancel feeOn-time71%

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