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Cheap flights from Idaho to Sydney from $787

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 17/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
25 May — 1 Jun1
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 25 April 2026.

Tue 9/616:09
GEG
-
SYD
1 stop21h 56m
Alaska Airlines
Tue 16/609:10
SYD
-
GEG
1 stop19h 01m
Alaska Airlines
Deal found 24/4$1,562
Wed 2/1216:47
GEG
-
SYD
1 stop18h 23m
Multiple Airlines
Wed 16/1211:15
SYD
-
GEG
1 stop25h 06m
Multiple Airlines
Deal found 25/4$1,701
Sun 1/1116:47
GEG
-
SYD
1 stop18h 23m
Multiple Airlines
Sat 21/1111:15
SYD
-
GEG
1 stop30h 10m
Multiple Airlines
Deal found 20/4$1,702
Sun 1/1105:25
GEG
-
SYD
1 stop30h 30m
Qantas Airways
Sat 21/1114:05
SYD
-
GEG
1 stop25h 50m
Qantas Airways
Deal found 23/4$1,715
Sun 1/1105:00
GEG
-
SYD
2 stops31h 00m
United Airlines
Sat 21/1112:10
SYD
-
GEG
1 stop18h 14m
United Airlines
Deal found 20/4$1,723
Sun 1/1115:05
GEG
-
SYD
2 stops22h 55m
American Airlines
Sat 21/1111:15
SYD
-
GEG
2 stops21h 40m
American Airlines
Deal found 20/4$1,724
Sat 31/1013:45
GEG
-
SYD
2 stops25h 30m
United Airlines
Tue 3/1111:50
SYD
-
GEG
2 stops28h 19m
United Airlines
Deal found 22/4$1,729
Fri 7/819:25
GEG
-
SYD
1 stop18h 30m
United Airlines
Tue 11/809:30
SYD
-
GEG
2 stops22h 28m
United Airlines
Deal found 20/4$1,730
Tue 9/619:05
BOI
-
SYD
1 stop19h 50m
United Airlines
Tue 16/610:20
SYD
-
BOI
1 stop18h 48m
United Airlines
Deal found 25/4$1,743
Sat 31/1017:47
GEG
-
SYD
1 stop20h 13m
Qantas Airways
Tue 3/1111:15
SYD
-
GEG
1 stop25h 06m
Qantas Airways
Deal found 22/4$1,787
Wed 30/918:47
BOI
-
SYD
1 stop20h 43m
Multiple Airlines
Mon 5/1010:10
SYD
-
BOI
1 stop20h 34m
Multiple Airlines
Deal found 21/4$1,810
Wed 2/1218:51
BOI
-
SYD
1 stop20h 09m
Alaska Airlines
Wed 16/1211:15
SYD
-
BOI
1 stop20h 29m
Alaska Airlines
Deal found 24/4$1,814

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 25 April 2026.

Round-trip from

$1,562

One-way from

$787

Popular in

December

Cheapest in

March

Average price

$1,779
Alaska Airlines
  • Alaska Airlines
  • 9/6-16/6
  • 2 total stops
  • 40h 57m total
  • Idaho to Sydney
Search Deals
17/5
  • 17/5
  • 2 total stops
  • 35h 50m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($257 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($37 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 25 April 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

Tue 9/6

16:09-07:05

1 stop21h 56m

Sydney Kingsford Smith

Tue 16/6

09:10-11:11

1 stop19h 01m

$1,562

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Fri 7/8

13:41-07:00

2 stops24h 19m

Sydney Kingsford Smith

Tue 11/8

09:30-14:58

2 stops22h 28m

$1,730
Fastest return journey

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 9/6

19:05-06:55

1 stop19h 50m

Sydney Kingsford Smith

Tue 16/6

10:20-13:08

1 stop18h 48m

$1,743

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 30/9

18:47-07:30

1 stop20h 43m

Sydney Kingsford Smith

Mon 5/10

10:10-13:44

1 stop20h 34m

$1,810

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 30/9

13:42-07:05

2 stops25h 23m

Sydney Kingsford Smith

Mon 5/10

13:00-22:17

1 stop26h 17m

$1,846

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 20/5

14:14-06:55

2 stops24h 41m

Sydney Kingsford Smith

Wed 27/5

09:10-17:09

2 stops23h 59m

$1,848

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 22/6

19:05-06:55

1 stop19h 50m

Sydney Kingsford Smith

Fri 3/7

09:30-19:18

1 stop25h 48m

$1,911

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 30/7

13:57-07:05

2 stops25h 08m

Sydney Kingsford Smith

Mon 31/8

17:50-22:40

2 stops20h 50m

$1,912

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 22/6

17:40-07:05

2 stops21h 25m

Sydney Kingsford Smith

Fri 3/7

12:00-23:05

1 stop27h 05m

$1,912

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 30/9

18:47-07:30

1 stop20h 43m

Sydney Kingsford Smith

Mon 5/10

18:50-13:44

1 stop35h 54m

$1,915

Flights are sorted by cheapest return flights first.

Deals found on 21/4

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 21h 56m. 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
Terrigal
Lithgow
Cronulla
Manly
Bondi Beach
Leura
Randwick
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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