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Cheap flights from Idaho to Sydney from $817

BOI — SYD
21 Oct — 28 Oct1
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

Wed 4/1117:24 -
1 stop20h 36m
Wed 11/1114:05 -
1 stop25h 35m
Deal found 20/9$1,425
Wed 28/1014:51 -
1 stop24h 09m
Tue 10/1114:05 -
1 stop25h 35m
Deal found 19/9$1,473
Tue 20/1013:57 -
1 stop22h 28m
Tue 27/1011:10 -
1 stop20h 07m
Deal found 16/9$1,479
Sat 21/1108:05 -
2 stops30h 30m
Thu 26/1111:20 -
2 stops26h 20m
Deal found 17/9$1,480
Wed 4/1117:24 -
1 stop20h 36m
Wed 11/1121:25 -
2 stops20h 31m
Deal found 20/9$1,484
Wed 28/1014:51 -
1 stop24h 09m
Tue 10/1111:15 -
2 stops22h 07m
Deal found 18/9$1,486
Fri 20/1107:00 -
2 stops31h 35m
Thu 26/1111:20 -
2 stops42h 18m
Deal found 17/9$1,493
Fri 16/1019:46 -
2 stops42h 34m
Wed 25/1111:20 -
2 stops28h 37m
Deal found 17/9$1,510
Wed 4/1119:30 -
2 stops43h 05m
Wed 11/1111:50 -
2 stops27h 43m
Deal found 19/9$1,744
Wed 4/1114:03 -
2 stops22h 22m
Wed 11/1114:05 -
1 stop26h 37m
Deal found 19/9$1,838
Wed 4/1119:30 -
1 stop19h 30m
Wed 11/1111:10 -
1 stop18h 58m
Deal found 19/9$1,866
Mon 30/1112:00 -
1 stop27h 20m
Wed 30/1213:20 -
1 stop26h 16m
Deal found 20/9$1,977

Find flight deals from Idaho to Sydney

Round-trip from

$1,473

One-way from

$817

Popular in

November

Cheapest in

March

Average price

$1,716
Qantas Airways
  • Qantas Airways
  • 28/10-10/11
  • 2 total stops
  • 49h 44m total
  • Idaho to Sydney
Search Deals
3/11-31/12
  • 3/11-31/12
  • 2 total stops
  • 25h 36m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($385 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($56 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

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

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Route

Depart

Return

Price

Cheapest return flight

BoiseSydney

BOI Boise Air Term. Gowen Fld - SYD Sydney Kingsford Smith

BOISYD

Boise Air Term. Gowen Fld

Tue 3/11

10:49-06:25

2 stops25h 36m

Sydney Kingsford Smith

Wed 31/12

00:00-07:00

Nonstop0h 00m

$817

BoiseSydney

BOI Boise Air Term. Gowen Fld - SYD Sydney Kingsford Smith

BOISYD

Boise Air Term. Gowen Fld

Sat 6/3

06:00-06:25

2 stops30h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-07:00

Nonstop0h 00m

$852

BoiseSydney

BOI Boise Air Term. Gowen Fld - SYD Sydney Kingsford Smith

BOISYD

Boise Air Term. Gowen Fld

Tue 3/11

14:03-06:25

2 stops22h 22m

Sydney Kingsford Smith

Wed 31/12

00:00-07:00

Nonstop0h 00m

$955

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Wed 7/10

05:10-07:50

2 stops32h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,188
Fastest return journey

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Mon 5/10

16:19-07:50

1 stop21h 31m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,331

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Sun 4/10

06:22-07:50

1 stop31h 28m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,374

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Wed 28/10

14:51-09:00

1 stop24h 09m

Sydney Kingsford Smith

Tue 10/11

11:15-14:22

2 stops22h 07m

$1,486

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Wed 28/10

14:51-09:00

1 stop24h 09m

Sydney Kingsford Smith

Wed 11/11

21:25-22:56

2 stops20h 31m

$1,486

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Sun 1/11

07:00-09:35

2 stops31h 35m

Sydney Kingsford Smith

Sat 21/11

11:20-18:41

2 stops26h 21m

$1,526

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Wed 2/12

07:00-09:05

2 stops31h 05m

Sydney Kingsford Smith

Wed 16/12

09:15-17:53

2 stops27h 38m

$1,538

Flights are sorted by cheapest return flights first.

Deals found on 19/9

Showing 1-10 of 19 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

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, March is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,510). Flying from Idaho to Sydney in November is currently the most expensive (average of $2,267). 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.

How much does it cost for a return flight from Idaho to Sydney?

Airfare is below average for this route at the moment.
Idaho to Sydney flights typically cost between $1,776 and $1,811 in March.
The cheapest return price found within the last 5 days was $1,693 on Multiple Airlines (10 Mar–31 Mar).

Related info for your journey

  • 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 22m. 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.

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

    Currently, March is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,510). Flying from Idaho to Sydney in November is currently the most expensive (average of $2,267). 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

Travelling to a place near Sydney?

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

Browse thousands of different options on Cheapflights for your next trip

Fly with Cheapflights

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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