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Cheap flights from Idaho to Sydney from $686

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
27 Apr — 4 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 28 March 2026.

Mon 3/806:20
GEG
-
SYD
1 stop31h 45m
Multiple Airlines
Wed 12/817:50
SYD
-
GEG
1 stop21h 28m
Multiple Airlines
Deal found 25/3$1,583
Wed 21/1017:47
GEG
-
SYD
1 stop20h 18m
Alaska Airlines
Wed 11/1111:15
SYD
-
GEG
1 stop25h 06m
Alaska Airlines
Deal found 28/3$1,588
Mon 21/917:47
GEG
-
SYD
1 stop20h 18m
Alaska Airlines
Tue 20/1010:10
SYD
-
GEG
1 stop25h 11m
Alaska Airlines
Deal found 27/3$1,589
Sun 10/506:00
GEG
-
SYD
1 stop31h 55m
American Airlines
Sun 17/512:00
SYD
-
GEG
1 stop25h 33m
American Airlines
Deal found 26/3$1,599
Sat 19/917:47
GEG
-
SYD
1 stop20h 18m
Alaska Airlines
Sat 17/1010:10
SYD
-
GEG
1 stop30h 15m
Alaska Airlines
Deal found 25/3$1,602
Sun 10/513:41
GEG
-
SYD
2 stops24h 19m
United Airlines
Sun 17/510:20
SYD
-
GEG
1 stop17h 56m
United Airlines
Deal found 26/3$1,604
Mon 3/813:41
GEG
-
SYD
2 stops24h 14m
United Airlines
Wed 12/809:30
SYD
-
GEG
2 stops22h 28m
United Airlines
Deal found 25/3$1,611
Sun 1/1116:47
GEG
-
SYD
1 stop18h 23m
Multiple Airlines
Sat 21/1114:05
SYD
-
GEG
1 stop25h 50m
Multiple Airlines
Deal found 23/3$1,621
Tue 5/513:54
GEG
-
SYD
1 stop24h 11m
Multiple Airlines
Thu 14/517:50
SYD
-
GEG
1 stop22h 02m
Multiple Airlines
Deal found 24/3$1,644
Tue 5/513:41
GEG
-
SYD
2 stops24h 14m
United Airlines
Thu 14/510:20
SYD
-
GEG
1 stop17h 56m
United Airlines
Deal found 24/3$1,678
Mon 11/508:11
BOI
-
SYD
2 stops35h 54m
Multiple Airlines
Mon 18/513:15
SYD
-
BOI
2 stops25h 43m
Multiple Airlines
Deal found 27/3$1,770
Sun 10/519:14
BOI
-
SYD
2 stops24h 36m
Multiple Airlines
Sun 17/513:15
SYD
-
BOI
2 stops25h 43m
Multiple Airlines
Deal found 26/3$1,783

Find flight deals from Idaho to Sydney

Keep the following information in mind while searching for Idaho to Sydney flight deals. Data was last updated 28 March 2026.

Round-trip from

$1,583

One-way from

$686

Popular in

March

Cheapest in

October

Average price

$2,214
3/8-12/8
  • 3/8-12/8
  • 2 total stops
  • 53h 13m total
  • Idaho to Sydney
Search Deals
5/5
  • 5/5
  • 2 total stops
  • 28h 56m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($122 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($43 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 28 March 2026.
Use the filters below to find and compare flights from Idaho to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 21/9

17:47-07:05

1 stop20h 18m

Sydney Kingsford Smith

Tue 20/10

10:10-17:21

1 stop25h 11m

$1,589

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 10/5

13:41-07:00

2 stops24h 19m

Sydney Kingsford Smith

Sun 17/5

10:20-11:16

1 stop17h 56m

$1,604

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 10/5

15:15-07:05

2 stops22h 50m

Sydney Kingsford Smith

Sun 17/5

17:50-23:09

2 stops22h 19m

$1,605

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Tue 5/5

13:41-06:55

2 stops24h 14m

Sydney Kingsford Smith

Thu 14/5

10:20-11:16

1 stop17h 56m

$1,678

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sat 9/5

05:00-07:00

2 stops33h 00m

Sydney Kingsford Smith

Sat 16/5

10:20-21:16

2 stops27h 56m

$1,756

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 13/5

12:25-06:55

1 stop25h 30m

Sydney Kingsford Smith

Sun 17/5

10:20-11:16

1 stop17h 56m

$1,784

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 21/9

15:50-07:05

2 stops22h 15m

Sydney Kingsford Smith

Tue 20/10

13:00-20:47

1 stop25h 47m

$1,786

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 10/5

12:30-06:55

1 stop26h 25m

Sydney Kingsford Smith

Sun 17/5

10:20-11:27

1 stop17h 07m

$1,916

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 12/5

13:41-06:55

1 stop25h 14m

Sydney Kingsford Smith

Tue 19/5

09:10-20:18

2 stops27h 08m

$1,929
Fastest return journey

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 10/7

18:51-07:30

1 stop20h 39m

Sydney Kingsford Smith

Sat 25/7

17:50-22:45

1 stop20h 55m

$1,996

Flights are sorted by cheapest return flights first.

Deals found on 27/3

Showing 1-10 of 22 resultsSorted by cheapest first
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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 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

How much does it cost for a return flight 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?

    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 20h 18m. Airlines will cover a distance of 12796 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
Lithgow
Katoomba
Manly
Bondi Beach
Coogee
Cronulla
Leura
Randwick

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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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