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$1,293+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
May 11 — May 181
Mon 5/11
Mon 5/18
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 April 11, 2026.

This Alaska Airlines deal was found by Cheapflights users on 4/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:47 pm
BOI
-
SYD
1 stop20h 43m
Alaska Airlines
Mon 10/56:50 pm
SYD
-
BOI
1 stop21h 05m
Alaska Airlines
Deal found 4/10$1,293
This Alaska Airlines deal was found by Cheapflights users on 4/9. 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.
Sat 11/76:51 pm
BOI
-
SYD
1 stop20h 09m
Alaska Airlines
Sat 11/1411:15 am
SYD
-
BOI
1 stop29h 40m
Alaska Airlines
Deal found 4/9$1,301
This Justfly.com deal was found by Cheapflights users on 4/8. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/57:14 pm
BOI
-
SYD
1 stop19h 51m
Qantas Airways
Tue 5/125:50 pm
SYD
-
BOI
1 stop21h 11m
Qantas Airways
Deal found 4/8$1,319
This American Airlines deal was found by Cheapflights users on 4/6. 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 5/2611:19 am
BOI
-
SYD
1 stop27h 36m
American Airlines
Sun 6/712:00 pm
SYD
-
BOI
1 stop26h 29m
American Airlines
Deal found 4/6$1,323
This American Airlines deal was found by Cheapflights users on 4/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2611:19 am
BOI
-
SYD
1 stop27h 36m
American Airlines
Tue 6/212:00 pm
SYD
-
BOI
1 stop26h 29m
American Airlines
Deal found 4/11$1,325
This United Airlines deal was found by Cheapflights users on 4/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/252:05 pm
BOI
-
SYD
1 stop24h 50m
United Airlines
Mon 6/110:20 am
SYD
-
BOI
1 stop22h 24m
United Airlines
Deal found 4/10$1,328
This American Airlines deal was found by Cheapflights users on 4/10. 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.
Mon 5/251:59 pm
BOI
-
SYD
2 stops25h 06m
American Airlines
Mon 6/112:00 pm
SYD
-
BOI
1 stop26h 29m
American Airlines
Deal found 4/10$1,329
This Alaska Airlines deal was found by Cheapflights users on 4/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:51 pm
BOI
-
SYD
1 stop20h 09m
Alaska Airlines
Thu 11/511:15 am
SYD
-
BOI
1 stop20h 29m
Alaska Airlines
Deal found 4/6$1,382

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 April 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,293
(Alaska Airlines)

Popular in

December

Cheapest in

March

Average price

$1,270
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 ($132 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 April 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 April 11, 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

Wed 9/30

6:47 pm-7:30 am

1 stop20h 43m

Sydney Kingsford Smith

Mon 10/5

6:50 pm-10:55 pm

1 stop21h 05m

$1,293

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 5/26

11:19 am-6:55 am

1 stop27h 36m

Sydney Kingsford Smith

Sun 6/7

12:00 pm-10:29 pm

1 stop26h 29m

$1,323

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 5/26

11:19 am-6:55 am

1 stop27h 36m

Sydney Kingsford Smith

Tue 6/2

12:00 pm-10:29 pm

1 stop26h 29m

$1,325

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 5/25

2:05 pm-6:55 am

1 stop24h 50m

Sydney Kingsford Smith

Mon 6/1

10:20 am-4:44 pm

1 stop22h 24m

$1,328

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 5/25

1:59 pm-7:05 am

2 stops25h 06m

Sydney Kingsford Smith

Mon 6/1

5:50 pm-11:11 pm

2 stops21h 21m

$1,329

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 6/22

2:05 pm-6:55 am

1 stop24h 50m

Sydney Kingsford Smith

Tue 6/30

10:20 am-1:08 pm

1 stop18h 48m

$1,406

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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 April 11, 2026.
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
9,574 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,574 reviews
United Airlines
7.4
Good
9,574 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.1
Good
11,570 reviews
United Airlines
7.4
Good
9,574 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 43m. There are 7894 mi between Boise and Sydney. This flight may include one or multiple stops.

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

    Cheapflights users have booked flights from Boise to Sydney round-trip from $987. Another airline that can offer you cheap pricing is United Airlines. You may be able to fly from Boise to Sydney for 22% 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.

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 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 April 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$987Average$1,296FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$1,094Average$1,452FlexibilityNo cancel feeOn-time69%

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