Find flights
When to book
FAQs

Cheap flights from Idaho to Sydney from $1,328

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
18 Dec — 25 Dec1
1 adult
1 adult, Economy, 0 bags

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 18 November 2025.

Mon 1/1215:05GEG - SYD
2 stops22h 55mAmerican Airlines
Sat 13/1211:20SYD - GEG
2 stops21h 38mAmerican Airlines
Deal found 16/11$1,328
Wed 19/1113:10GEG - SYD
2 stops24h 20mDelta
Wed 26/1110:40SYD - GEG
2 stops23h 13mDelta
Deal found 15/11$1,354
Wed 19/1114:38GEG - SYD
1 stop23h 22mQantas Airways
Wed 26/1114:05SYD - GEG
1 stop25h 50mQantas Airways
Deal found 15/11$1,402
Sat 29/1105:25GEG - SYD
1 stop30h 30mAmerican Airlines
Sun 7/1211:20SYD - GEG
2 stops21h 29mAmerican Airlines
Deal found 17/11$1,409
Sat 29/1106:00GEG - SYD
2 stops31h 30mDelta
Sun 7/1210:40SYD - GEG
2 stops20h 49mDelta
Deal found 17/11$1,431
Mon 1/1212:45GEG - SYD
1 stop25h 30mUnited Airlines
Sat 13/1212:10SYD - GEG
1 stop25h 34mUnited Airlines
Deal found 16/11$1,698
Tue 18/1105:54BOI - SYD
2 stops43h 51mAlaska Airlines
Tue 25/1121:40SYD - BOI
2 stops37h 25mAlaska Airlines
Deal found 17/11$2,131
Fri 21/1105:41BOI - SYD
2 stops20h 04mHawaiian Airlines
Tue 25/1121:40SYD - BOI
2 stops29h 39mHawaiian Airlines
Deal found 17/11$2,243
Tue 30/1218:55BOI - SYD
1 stop20h 20mUnited Airlines
Sun 15/214:00SYD - BOI
1 stop25h 11mUnited Airlines
Deal found 17/11$2,321
Mon 17/1108:41BOI - SYD
2 stops30h 54mMultiple Airlines
Mon 24/1122:20SYD - BOI
2 stops42h 28mMultiple Airlines
Deal found 16/11$2,386
Wed 31/1206:00GEG - SYD
1 stop29h 20mUnited Airlines
Wed 7/111:50SYD - GEG
2 stops43h 56mUnited Airlines
Deal found 16/11$2,432
Tue 18/1114:11BOI - SYD
1 stop24h 54mAir New Zealand
Tue 25/1119:15SYD - BOI
2 stops60h 15mAir New Zealand
Deal found 17/11$2,730

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 18 November 2025.

Round-trip from

$1,328

Popular in

December

Cheapest in

September

Average price

$2,091
American Airlines
  • American Airlines
  • 1/12-13/12
  • 4 total stops
  • 44h 33m total
  • Idaho to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($338 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($52 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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 November 2025.
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

Mon 23/3

15:45-09:00

2 stops23h 15m

Sydney Kingsford Smith

Thu 16/4

17:45-22:56

2 stops22h 11m

$1,328

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 23/3

06:40-09:00

1 stop32h 20m

Sydney Kingsford Smith

Thu 16/4

09:10-22:38

1 stop30h 28m

$1,346

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 11/2

15:40-08:30

2 stops21h 50m

Sydney Kingsford Smith

Tue 17/2

10:40-18:47

2 stops27h 07m

$1,354

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Wed 6/5

15:05-06:35

2 stops22h 30m

Sydney Kingsford Smith

Sun 10/5

09:25-14:06

1 stop21h 41m

$1,354

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Mon 23/3

13:43-09:05

2 stops25h 22m

Sydney Kingsford Smith

Thu 16/4

10:20-21:35

1 stop28h 15m

$1,363

SpokaneSydney

GEG - SYD

GEGSYD

Spokane

Sun 1/3

05:00-07:00

2 stops31h 00m

Sydney Kingsford Smith

Thu 12/3

11:50-21:18

2 stops27h 28m

$1,385

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 1/2

07:20-06:55

1 stop29h 35m

Sydney Kingsford Smith

Sat 28/2

14:05-22:36

1 stop26h 31m

$1,913

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 1/2

19:59-19:45

2 stops29h 46m

Sydney Kingsford Smith

Sat 28/2

21:40-09:30

2 stops29h 50m

$2,013

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 6/5

13:00-06:35

1 stop25h 35m

Sydney Kingsford Smith

Sun 10/5

09:25-15:01

1 stop21h 36m

$2,068

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 4/3

08:41-06:20

1 stop27h 39m

Sydney Kingsford Smith

Wed 18/3

12:10-19:16

1 stop24h 06m

$2,070

Flights are sorted by cheapest return flights first.

Deals found on 17/11

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

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

Currently, September is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,360). Flying from Idaho to Sydney in July is currently the most expensive (average of $2,235). 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?

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 50m. 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.

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

    Currently, September is the cheapest month in which you can book a flight from Idaho to Sydney (average of $1,360). Flying from Idaho to Sydney in July is currently the most expensive (average of $2,235). 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
Katoomba
Penrith
Terrigal
Manly
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
San Francisco to Sydney flights
John F Kennedy Intl to Sydney flights
Dallas/Fort Worth to Sydney flights
Newark to Sydney flights
Seattle to Sydney flights
Honolulu to Sydney flights
Hobby to Sydney flights
Dulles Intl to Sydney flights
O'Hare Intl to Sydney flights
George Bush Intcntl to Sydney flights
Baltimore to Sydney flights
Atlanta to Sydney flights
Reagan-National to Sydney flights
Denver to Sydney flights
Detroit to Sydney flights
Minneapolis to Sydney flights
Boston to Sydney flights
San Jose to Sydney flights
Midway to Sydney flights
Portland to Sydney flights
Sky Harbor Intl to Sydney flights
Oakland to Sydney flights
San Diego to Sydney flights
Miami to Sydney flights
Raleigh to Sydney flights
Philadelphia to Sydney flights
Charlotte to Sydney flights
Austin to Sydney flights
Orlando to Sydney flights
Indianapolis to Sydney flights
Pittsburgh to Sydney flights
Love Field to Sydney flights
Fort Lauderdale to Sydney flights
Tampa to Sydney flights
Las Vegas to Sydney flights
Salt Lake City to Sydney flights
Cincinnati to Sydney flights
St. Louis to Sydney flights
Memphis to Sydney flights
Nashville to Sydney flights
Syracuse to Sydney flights
Columbus to Sydney flights
Kansas City to Sydney flights
Milwaukee to Sydney flights

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.