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$918+ Cheap flights from Sydney (SYD) to Idaho

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — BOI
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
1 adult, Economy
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Cheap flight deals from Sydney to Idaho

Keep the following information in mind while searching for Sydney to Idaho flight deals. Data was last updated September 14, 2025.

Round-trip from

$918
(American Airlines)

Popular in

July

Cheapest in

October
From Sydney Kingsford Smith to Idaho
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
Search Deals

Find flight deals from Sydney to Idaho

Cheapest flights from Sydney to Idaho
Explore the most affordable flight options available from Sydney to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 14, 2025.

This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:20 amSYD - BOI
2 stops28h 04mAmerican Airlines
Mon 11/35:25 pmBOI - SYD
2 stops45h 35mAmerican Airlines
Deal found 9/11$918
This Delta deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:40 amSYD - BOI
1 stop22h 25mDelta
Mon 11/35:55 pmBOI - SYD
2 stops44h 35mDelta
Deal found 9/12$938
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3012:10 pmSYD - BOI
1 stop20h 53mUnited Airlines
Mon 11/310:39 amBOI - SYD
2 stops28h 26mUnited Airlines
Deal found 9/11$955

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sydney to Idaho 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 2,558,603 searches. Data last updated September 14, 2025.
Use the filters below to find and compare flights from Sydney to Idaho that are best for you.

Fly from

Sydney

Fly to

Idaho

Route

Depart

Return

Price

SydneyBoise

SYD - BOI

SYDBOI

Sydney Kingsford Smith

Thu 10/30

11:20 am-10:24 pm

2 stops28h 04m

Boise Air Term. Gowen Fld

Mon 11/3

5:25 pm-9:00 am

2 stops45h 35m

$918

SydneyBoise

SYD - BOI

SYDBOI

Sydney Kingsford Smith

Thu 10/30

9:40 am-3:05 pm

1 stop22h 25m

Boise Air Term. Gowen Fld

Mon 11/3

5:55 pm-8:30 am

2 stops44h 35m

$938

SydneyBoise

SYD - BOI

SYDBOI

Sydney Kingsford Smith

Thu 10/30

12:10 pm-4:03 pm

1 stop20h 53m

Boise Air Term. Gowen Fld

Mon 11/3

10:39 am-9:05 am

2 stops28h 26m

$955

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Best time to book a flight from Sydney to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Sydney with our price prediction graph.
Estimated round-trip 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 Sydney to Idaho
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated September 14, 2025.
Read through reviews of airlines operating flights from Sydney to Idaho, such as United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,931 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,931 reviews
United Airlines
7.4
Good
8,931 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from Sydney to Idaho. 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 from for flights from Sydney to Idaho?

    Located just 4.6 mi from the city center, Sydney Kingsford Smith (SYD) is the airport most travelers will use when flying to Idaho from Sydney.

  • How long is the flight from Sydney to Idaho?

    For as low as $955, American Airlines can have you in Idaho from Sydney in 20h 53m. The distance between Sydney and Idaho is about 7894 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Sydney to Idaho that include hotel bookings?

    Yes. In addition to deals on Sydney to Idaho flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Sydney to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to Idaho.

  • Can I find deals for business class flights from Sydney to Idaho?

    Yes. Cheapflights offers flight deals from Sydney to Idaho 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 Sydney to Idaho?

    Currently, October is the cheapest month in which you can book a flight from Sydney to Idaho (average of $314). Flying from Sydney to Idaho in June is currently the most expensive (average of $398). 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

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Top airline flying from Sydney to Idaho

Discover the top airline that operate flights from Sydney to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,019Average$1,308FlexibilityNo cancel feeOn-time69%

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