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Cheap flights from Idaho to Sydney from $1,437

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
12 Feb — 19 Feb1
1 adult
1 adult, Economy, 0 bags

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 13 January 2026.

Round-trip from

$1,437

Popular in

December

Cheapest in

September
3/3-10/3
  • 3/3-10/3
  • 2 total stops
  • 43h 48m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($391 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($51 potential savings vs. average return price).
Search Deals

Find flight deals from Idaho to Sydney

Enter your travel dates to find the best prices.

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 13 January 2026.

Tue 3/315:45
GEG
-
SYD
1 stop19h 25m
Multiple Airlines
Tue 10/311:20
SYD
-
GEG
1 stop24h 23m
Multiple Airlines
Deal found 10/1$1,437
Tue 20/116:59
GEG
-
SYD
1 stop18h 11m
Multiple Airlines
Sat 7/214:05
SYD
-
GEG
1 stop23h 44m
Multiple Airlines
Deal found 13/1$1,445
Sun 1/1105:25
GEG
-
SYD
1 stop30h 30m
American Airlines
Sat 21/1114:05
SYD
-
GEG
1 stop25h 50m
American Airlines
Deal found 11/1$1,446
Tue 3/306:00
GEG
-
SYD
1 stop29h 55m
American Airlines
Tue 10/317:45
SYD
-
GEG
2 stops23h 29m
American Airlines
Deal found 11/1$1,452
Tue 3/305:00
GEG
-
SYD
2 stops30h 50m
Delta
Tue 10/313:15
SYD
-
GEG
2 stops20h 53m
Delta
Deal found 11/1$1,476
Fri 13/206:25
GEG
-
SYD
1 stop31h 05m
Delta
Tue 24/214:15
SYD
-
GEG
1 stop26h 03m
Delta
Deal found 11/1$1,477
Sat 7/306:00
GEG
-
SYD
1 stop29h 55m
Qantas Airways
Tue 10/313:05
SYD
-
GEG
1 stop21h 49m
Qantas Airways
Deal found 11/1$1,522
Mon 6/407:11
BOI
-
SYD
2 stops33h 34m
Air New Zealand
Mon 20/419:20
SYD
-
BOI
2 stops40h 53m
Air New Zealand
Deal found 13/1$1,717
Wed 25/207:11
BOI
-
SYD
2 stops31h 34m
Air New Zealand
Wed 4/313:55
SYD
-
BOI
2 stops25h 00m
Air New Zealand
Deal found 10/1$1,743
Sat 26/908:05
BOI
-
SYD
2 stops31h 40m
Air New Zealand
Mon 5/1019:20
SYD
-
BOI
2 stops44h 02m
Air New Zealand
Deal found 11/1$1,779
Fri 7/808:21
BOI
-
SYD
2 stops32h 24m
Air New Zealand
Fri 21/809:55
SYD
-
BOI
2 stops29h 00m
Air New Zealand
Deal found 11/1$1,788
Wed 11/207:20
BOI
-
SYD
1 stop29h 35m
American Airlines
Wed 18/214:05
SYD
-
BOI
1 stop26h 17m
American Airlines
Deal found 12/1$1,789

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 13 January 2026.
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

Tue 3/3

15:45-06:10

1 stop19h 25m

Sydney Kingsford Smith

Tue 10/3

11:20-17:43

1 stop24h 23m

$1,437

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 25/2

06:00-06:55

1 stop29h 55m

Sydney Kingsford Smith

Wed 4/3

14:05-21:12

1 stop26h 07m

$1,446

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 5/3

06:00-06:55

1 stop29h 55m

Sydney Kingsford Smith

Thu 12/3

17:45-23:14

2 stops23h 29m

$1,452

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 13/2

15:45-08:30

2 stops21h 45m

Sydney Kingsford Smith

Tue 24/2

14:15-21:18

1 stop26h 03m

$1,476

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 5/3

09:25-06:50

2 stops26h 25m

Sydney Kingsford Smith

Thu 12/3

09:40-16:08

2 stops24h 28m

$1,476

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 3/3

09:25-06:50

2 stops26h 25m

Sydney Kingsford Smith

Tue 10/3

09:40-18:15

2 stops26h 35m

$1,476

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 11/2

07:20-06:55

1 stop29h 35m

Sydney Kingsford Smith

Wed 18/2

14:05-22:22

1 stop26h 17m

$1,789

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 25/2

08:16-07:25

1 stop29h 09m

Sydney Kingsford Smith

Wed 4/3

11:20-12:44

1 stop19h 24m

$1,796

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 18/2

13:44-06:20

1 stop22h 36m

Sydney Kingsford Smith

Sun 22/2

12:10-11:17

1 stop17h 07m

$1,811

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 25/2

14:40-09:15

2 stops24h 35m

Sydney Kingsford Smith

Wed 4/3

11:20-20:55

1 stop27h 35m

$1,811

Flights are sorted by cheapest return flights first.

Deals found on 10/1

Showing 1-10 of 11 results
1
2

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 return 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
No data available for this route at this time. Please check back soon.

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?

    Sydney Kingsford Smith (SYD), located 7.5 km from the city centre, is the airport you fly into when you book flights from Idaho to Sydney.

  • How long is the flight from Idaho to Sydney?

    Departing from Idaho to Sydney will take you 22h 36m. Airlines will cover a distance of 12704 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with 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 holiday 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.

See more FAQs

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Terrigal
Katoomba
Manly
Lithgow
Coogee
Leura
Randwick
Cronulla
Bondi Beach

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Idaho to Sydney?

Cheapflights makes it easy to find Idaho to Sydney flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Idaho to Sydney?

Cheapflights helps you find that perfect flight to Sydney from Idaho by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Idaho to Sydney with no change fees?

Certainly. Search results for flights to Sydney from Idaho shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Idaho to Sydney become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Sydney from Idaho today and book when prices fit your budget.

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