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Cheap flights from Boise to Sydney from $865

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 19/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
15 Feb — 22 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Boise to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 16 January 2026.

Round-trip from

$1,722

One-way from

$865

Popular in

December

Cheapest in

September
4/5-17/5
  • 4/5-17/5
  • 4 total stops
  • 45h 31m total
  • Boise to Sydney
Search Deals
19/2
  • 19/2
  • 3 total stops
  • 47h 04m total
  • Boise to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($393 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

Find flight deals from Boise to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Boise to Sydney
Explore the most affordable flight options available from Boise to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 January 2026.

Mon 4/518:55
BOI
-
SYD
2 stops23h 45m
Multiple Airlines
Sun 17/511:55
SYD
-
BOI
2 stops21h 46m
Multiple Airlines
Deal found 14/1$1,722
Tue 5/518:55
BOI
-
SYD
2 stops21h 50m
Air New Zealand
Mon 18/509:55
SYD
-
BOI
2 stops25h 21m
Air New Zealand
Deal found 14/1$1,737
Mon 4/519:14
BOI
-
SYD
1 stop19h 51m
Alaska Airlines
Wed 13/509:10
SYD
-
BOI
1 stop29h 48m
Alaska Airlines
Deal found 14/1$1,760
Mon 4/518:55
BOI
-
SYD
2 stops21h 50m
Air New Zealand
Wed 13/509:55
SYD
-
BOI
2 stops28h 27m
Air New Zealand
Deal found 14/1$1,777
Sun 3/508:02
BOI
-
SYD
2 stops32h 43m
Air New Zealand
Sat 16/519:20
SYD
-
BOI
2 stops38h 21m
Air New Zealand
Deal found 14/1$1,787
Mon 4/518:55
BOI
-
SYD
2 stops23h 45m
Multiple Airlines
Fri 15/511:55
SYD
-
BOI
2 stops21h 46m
Multiple Airlines
Deal found 14/1$1,792
Sun 8/213:58
BOI
-
SYD
1 stop22h 57m
American Airlines
Mon 16/214:05
SYD
-
BOI
1 stop26h 17m
American Airlines
Deal found 15/1$1,793
Fri 1/512:30
BOI
-
SYD
2 stops28h 15m
Air New Zealand
Mon 18/509:55
SYD
-
BOI
2 stops25h 21m
Air New Zealand
Deal found 14/1$1,807
Mon 4/518:55
BOI
-
SYD
2 stops23h 45m
Air New Zealand
Sat 16/519:20
SYD
-
BOI
2 stops39h 56m
Air New Zealand
Deal found 14/1$1,810
Sun 3/516:05
BOI
-
SYD
1 stop22h 50m
United Airlines
Tue 19/510:20
SYD
-
BOI
1 stop26h 55m
United Airlines
Deal found 14/1$1,816

Cheapflights Fare Finder

 
Customise your flight search to find flights from Boise 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 16 January 2026.
Use the filters below to find and compare flights from Boise to Sydney that are best for you.

Fly from

Boise

Fly to

Sydney

Route

Depart

Return

Price

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 5/5

18:55-08:45

2 stops21h 50m

Sydney Kingsford Smith

Mon 18/5

09:55-19:16

2 stops25h 21m

$1,737

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 4/5

19:14-07:05

1 stop19h 51m

Sydney Kingsford Smith

Tue 19/5

09:10-22:58

1 stop29h 48m

$1,760

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 6/5

19:14-07:05

1 stop19h 51m

Sydney Kingsford Smith

Tue 19/5

09:10-22:58

1 stop29h 48m

$1,760

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 8/2

13:58-06:55

1 stop22h 57m

Sydney Kingsford Smith

Mon 16/2

14:05-22:22

1 stop26h 17m

$1,793

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sun 19/4

06:15-08:45

2 stops34h 30m

Sydney Kingsford Smith

Sat 25/4

19:20-22:27

2 stops43h 07m

$1,798

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 18/2

13:44-06:20

1 stop22h 36m

Sydney Kingsford Smith

Sun 22/2

14:00-21:11

1 stop25h 11m

$1,816

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 6/5

16:55-06:35

1 stop21h 40m

Sydney Kingsford Smith

Sun 17/5

09:15-15:01

1 stop21h 46m

$1,816

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 5/5

16:55-06:35

1 stop21h 40m

Sydney Kingsford Smith

Mon 18/5

09:15-15:01

1 stop21h 46m

$1,816

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 19/2

19:31-12:35

3 stops47h 04m

$865

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 19/2

12:40-09:00

2 stops26h 20m

$925

Flights are sorted by cheapest return flights first.

Deals found on 15/1

Showing 1-10 of 16 results
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Best time to book a flight from Boise to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Boise 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.

Related info for your journey

Find useful and relevant information for your journey from Boise to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Boise to Sydney?

    Departing from Boise to Sydney will take you 19h 51m. Airlines will cover a distance of 12704 km. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Boise 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
Terrigal
Katoomba
Manly
Lithgow
Coogee
Leura
Randwick
Cronulla
Bondi Beach

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Boise to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Spokane to Sydney flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Boise to Sydney?

Cheapflights helps you search for flights from Boise to Sydney via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Boise to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Boise to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Boise to Sydney with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Boise to Sydney, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Boise 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 Boise today and book when prices fit your budget.

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