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Cheap flights from Idaho to Sydney from $726

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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
18 Jul — 25 Jul1
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 18 June 2026.

Wed 2/1211:44
GEG
-
SYD
2 stops23h 41m
Multiple Airlines
Wed 16/1221:25
SYD
-
GEG
1 stop37h 43m
Multiple Airlines
Deal found 17/6$1,574
Wed 2/1216:47
GEG
-
SYD
1 stop18h 38m
Qantas Airways
Wed 16/1214:05
SYD
-
GEG
1 stop25h 52m
Qantas Airways
Deal found 17/6$1,581
Tue 13/1018:57
BOI
-
SYD
1 stop20h 08m
Qantas Airways
Tue 27/1007:05
SYD
-
BOI
2 stops23h 57m
Qantas Airways
Deal found 13/6$1,595
Sun 1/1117:57
BOI
-
SYD
1 stop21h 03m
Qantas Airways
Wed 20/107:05
SYD
-
BOI
2 stops24h 39m
Qantas Airways
Deal found 14/6$1,602
Wed 12/805:40
GEG
-
SYD
1 stop32h 15m
American Airlines
Wed 19/812:00
SYD
-
GEG
1 stop25h 42m
American Airlines
Deal found 14/6$1,636
Sun 1/1115:05
GEG
-
SYD
2 stops46h 55m
Multiple Airlines
Sat 21/1111:15
SYD
-
GEG
1 stop30h 10m
Multiple Airlines
Deal found 16/6$1,643
Wed 12/813:37
GEG
-
SYD
2 stops24h 23m
Air New Zealand
Wed 19/809:30
SYD
-
GEG
2 stops22h 36m
Air New Zealand
Deal found 14/6$1,646
Sun 1/1112:30
GEG
-
SYD
1 stop25h 45m
Air New Zealand
Sat 21/1112:10
SYD
-
GEG
1 stop18h 14m
Air New Zealand
Deal found 13/6$1,722
Thu 30/713:57
BOI
-
SYD
2 stops25h 33m
American Airlines
Mon 31/812:00
SYD
-
BOI
1 stop26h 11m
American Airlines
Deal found 17/6$1,758
Mon 3/818:51
BOI
-
SYD
1 stop20h 39m
Multiple Airlines
Sun 16/817:50
SYD
-
BOI
1 stop20h 55m
Multiple Airlines
Deal found 15/6$1,826
Mon 15/619:05
BOI
-
SYD
1 stop19h 50m
Air New Zealand
Mon 22/610:20
SYD
-
BOI
1 stop22h 24m
Air New Zealand
Deal found 14/6$1,830
Mon 3/814:41
BOI
-
SYD
2 stops24h 19m
United Airlines
Sun 16/810:20
SYD
-
BOI
1 stop16h 44m
United Airlines
Deal found 15/6$1,832

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 18 June 2026.

Round-trip from

$1,574

One-way from

$726

Popular in

November

Cheapest in

March

Average price

$1,864
2/12-16/12
  • 2/12-16/12
  • 3 total stops
  • 61h 24m total
  • Idaho to Sydney
Search Deals
2/9
  • 2/9
  • 3 total stops
  • 29h 33m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($263 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($62 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 18 June 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

Wed 2/12

11:44-06:25

2 stops23h 41m

Sydney Kingsford Smith

Wed 16/12

21:25-16:08

1 stop37h 43m

$1,574

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 2/12

16:47-06:25

1 stop18h 38m

Sydney Kingsford Smith

Wed 16/12

06:00-20:57

2 stops33h 57m

$1,681

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 2/12

12:30-09:15

1 stop25h 45m

Sydney Kingsford Smith

Tue 15/12

12:10-11:24

1 stop18h 14m

$1,722

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 19/8

12:33-06:55

1 stop25h 22m

Sydney Kingsford Smith

Sun 23/8

10:20-10:30

1 stop17h 10m

$1,741

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Thu 30/7

19:07-06:55

1 stop18h 48m

Sydney Kingsford Smith

Thu 6/8

09:30-21:05

2 stops28h 35m

$1,747

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 2/12

05:00-09:05

2 stops33h 05m

Sydney Kingsford Smith

Wed 16/12

11:20-21:09

2 stops28h 49m

$1,747

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 2/12

05:00-07:00

2 stops31h 00m

Sydney Kingsford Smith

Tue 15/12

12:10-11:24

1 stop18h 14m

$1,748

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 30/7

19:07-07:05

1 stop19h 58m

Sydney Kingsford Smith

Mon 31/8

06:00-12:33

2 stops22h 33m

$1,922

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 30/7

06:30-07:20

2 stops32h 50m

Sydney Kingsford Smith

Mon 31/8

09:20-21:37

2 stops28h 17m

$1,929

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 23/7

19:05-06:55

1 stop19h 50m

Sydney Kingsford Smith

Thu 30/7

10:20-16:44

1 stop22h 24m

$1,973

Flights are sorted by cheapest return flights first.

Deals found on 16/6

Showing 1-10 of 23 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 18h 38m. 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
Katoomba
Cronulla
Manly
Terrigal
Lithgow
Randwick
Bondi Beach
Leura
Coogee

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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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