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$537+ Cheap flights from Idaho to Sydney (SYD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Idaho to Sydney

Keep the following information in mind while searching for Idaho to Sydney flight deals. Data was last updated September 11, 2025.

Round-trip from

$898
(United Airlines)

One-way from

$537
(Trip.com)

Popular in

January

Cheapest in

May

Average price

$1,056
From Idaho to Sydney Kingsford Smith
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One-way flight from Idaho to Sydney Kingsford Smith
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Highest demand for flights based on searches. 12% potential increase in price ($179 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($28 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 Idaho to Sydney

Cheapest flights from Idaho to Sydney
Explore the most affordable flight options available from Idaho to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This lol.travel deal was found by Cheapflights users on 9/9. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/111:38 pmGEG - SYD
2 stops24h 22mUnited Airlines
Thu 9/259:30 amSYD - GEG
2 stops22h 40mUnited Airlines
Deal found 9/9$813
This United Airlines deal was found by Cheapflights users on 9/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/275:10 amGEG - SYD
2 stops30h 50mUnited Airlines
Mon 12/812:10 pmSYD - GEG
1 stop18h 42mUnited Airlines
Deal found 9/9$897
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 11/2512:45 pmGEG - SYD
1 stop25h 30mUnited Airlines
Fri 12/512:10 pmSYD - GEG
1 stop25h 34mUnited Airlines
Deal found 9/10$898
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 11/261:47 pmGEG - SYD
2 stops46h 13mUnited Airlines
Sun 12/712:10 pmSYD - GEG
2 stops27h 49mUnited Airlines
Deal found 9/10$902
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 11/44:05 pmGEG - SYD
2 stops67h 55mUnited Airlines
Mon 11/1712:10 pmSYD - GEG
1 stop17h 32mUnited Airlines
Deal found 9/10$915
This American Airlines deal was found by Cheapflights users on 9/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/91:38 pmBOI - SYD
1 stop25h 17mAmerican Airlines
Tue 9/1612:10 pmSYD - BOI
1 stop25h 38mAmerican Airlines
Deal found 9/8$970
This American Airlines deal was found by Cheapflights users on 9/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/107:00 amBOI - SYD
1 stop31h 55mAmerican Airlines
Wed 9/1712:10 pmSYD - BOI
1 stop25h 38mAmerican Airlines
Deal found 9/9$971
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/162:11 pmBOI - SYD
2 stops24h 34mMultiple Airlines
Mon 11/241:55 pmSYD - BOI
2 stops26h 53mMultiple Airlines
Deal found 9/10$1,176
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/237:13 amBOI - SYD
2 stops39h 27mMultiple Airlines
Thu 10/305:45 pmSYD - BOI
1 stop22h 17mMultiple Airlines
Deal found 9/9$1,261
This United Airlines deal was found by Cheapflights users on 9/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/232:36 pmBOI - SYD
1 stop24h 19mUnited Airlines
Thu 10/3010:20 amSYD - BOI
1 stop20h 10mUnited Airlines
Deal found 9/9$1,269
This oojo deal was found by Cheapflights users on 9/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/232:12 pmBOI - SYD
2 stops25h 33mAir New Zealand
Thu 10/3011:45 amSYD - BOI
2 stops42h 45mAir New Zealand
Deal found 9/9$1,270
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:15 amBOI - SYD
2 stops31h 30mMultiple Airlines
Sun 2/1511:45 amSYD - BOI
2 stops27h 50mMultiple Airlines
Deal found 9/10$1,271

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho 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 September 11, 2025.
Use the filters below to find and compare flights from Idaho to Sydney that are best for you.

Fly from

Idaho

Fly to

Sydney

Route

Depart

Return

Price

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 11/27

5:10 am-7:00 am

2 stops30h 50m

Sydney Kingsford Smith

Mon 12/8

12:10 pm-11:52 am

1 stop18h 42m

$897

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 11/25

12:45 pm-9:15 am

1 stop25h 30m

Sydney Kingsford Smith

Fri 12/5

12:10 pm-6:44 pm

1 stop25h 34m

$898

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 11/26

1:47 pm-7:00 am

2 stops46h 13m

Sydney Kingsford Smith

Sun 12/7

12:10 pm-6:44 pm

1 stop25h 34m

$902

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 12/1

5:10 am-9:05 am

2 stops32h 55m

Sydney Kingsford Smith

Fri 12/12

2:00 pm-8:59 pm

2 stops49h 59m

$915

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 11/4

4:05 pm-7:00 am

2 stops67h 55m

Sydney Kingsford Smith

Mon 11/17

12:10 pm-10:42 am

1 stop17h 32m

$915

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 2/2

5:30 am-7:45 pm

2 stops20h 15m

Sydney Kingsford Smith

Sat 2/28

9:40 pm-11:55 pm

2 stops20h 15m

$1,052

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 12/30

7:15 am-8:45 am

2 stops31h 30m

Sydney Kingsford Smith

Sun 2/15

11:45 am-9:35 pm

2 stops27h 50m

$1,271

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 11/16

6:05 pm-7:25 am

2 stops43h 20m

Sydney Kingsford Smith

Mon 11/24

5:45 pm-10:48 pm

1 stop23h 03m

$1,299

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 3/1

7:15 am-6:50 am

1 stop29h 35m

Sydney Kingsford Smith

Thu 3/12

1:15 pm-11:04 pm

1 stop26h 49m

$1,301

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 2/2

10:48 am-9:15 am

1 stop28h 27m

Sydney Kingsford Smith

Sat 2/28

12:10 pm-9:08 pm

1 stop26h 58m

$1,302

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 19 results
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Best time to book a flight from Idaho to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Idaho 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 Idaho to Sydney

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

Currently, February is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,035). Flying from Idaho to Sydney in December is currently the most expensive (average of $1,626). 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 ID to SYD?

Find hourly flight availability from Idaho 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 September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to Sydney as you normally would.

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

Related info for your journey

Find useful and relevant information for your journey from Idaho to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sydney from Idaho?

    If you book a flight to Sydney from Idaho, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 4.6 mi from the center of Sydney.

  • How long is the flight from Idaho to Sydney?

    A quick flight from Idaho to Sydney can take about 20h 15m. United Airlines provides one of the quickest options available for as low as $1,052. Idaho and Sydney are separated by a distance of 7894 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Idaho to Sydney that include hotel bookings?

    Yes. In addition to deals on Idaho to Sydney flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Sydney.

  • Can I find deals for business class flights from Idaho to Sydney?

    Yes. Cheapflights offers flight deals from Idaho 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 Idaho to Sydney?

    Currently, February is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,035). Flying from Idaho to Sydney in December is currently the most expensive (average of $1,626). 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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Top 2 airlines flying from Idaho to Sydney

Discover the top 2 airlines that operate flights from Idaho 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$898Average$1,325FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$987Average$1,296FlexibilityNo cancel feeOn-time71%

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