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Cheap flights from Boise to Sydney from $1,704

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
18 May — 25 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 18 April 2026.

Wed 20/519:33
BOI
-
SYD
1 stop19h 32m
Alaska Airlines
Tue 2/609:10
SYD
-
BOI
1 stop29h 48m
Alaska Airlines
Deal found 16/4$1,704
Sat 23/519:33
BOI
-
SYD
1 stop19h 32m
Alaska Airlines
Tue 2/609:10
SYD
-
BOI
1 stop29h 48m
Alaska Airlines
Deal found 16/4$1,774
Wed 1/718:51
BOI
-
SYD
1 stop20h 14m
Multiple Airlines
Wed 8/717:50
SYD
-
BOI
1 stop20h 55m
Multiple Airlines
Deal found 14/4$1,799
Wed 30/918:47
BOI
-
SYD
1 stop20h 43m
Multiple Airlines
Mon 5/1010:10
SYD
-
BOI
1 stop20h 34m
Multiple Airlines
Deal found 17/4$1,800
Wed 30/914:30
BOI
-
SYD
2 stops25h 00m
Alaska Airlines
Mon 5/1018:50
SYD
-
BOI
2 stops30h 17m
Alaska Airlines
Deal found 17/4$1,810
Mon 4/519:14
BOI
-
SYD
1 stop20h 16m
Multiple Airlines
Mon 11/509:10
SYD
-
BOI
1 stop19h 24m
Multiple Airlines
Deal found 13/4$1,814
Sat 12/907:05
BOI
-
SYD
1 stop32h 00m
Alaska Airlines
Sat 26/909:10
SYD
-
BOI
1 stop19h 23m
Alaska Airlines
Deal found 13/4$1,816
Tue 26/516:05
BOI
-
SYD
1 stop22h 50m
American Airlines
Sun 7/612:00
SYD
-
BOI
1 stop26h 29m
American Airlines
Deal found 15/4$1,830
Tue 19/515:23
BOI
-
SYD
1 stop23h 27m
Delta
Tue 2/609:15
SYD
-
BOI
1 stop21h 19m
Delta
Deal found 16/4$1,835
Tue 26/515:23
BOI
-
SYD
1 stop23h 27m
Delta
Sun 7/609:15
SYD
-
BOI
2 stops30h 54m
Delta
Deal found 16/4$1,841

Find 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 18 April 2026.

Round-trip from

$1,704

Popular in

December

Cheapest in

March

Average price

$1,770
Alaska Airlines
  • Alaska Airlines
  • 20/5-2/6
  • 2 total stops
  • 49h 20m total
  • Boise to Sydney
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($256 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 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 18 April 2026.
Use the filters below to find and compare flights from Boise to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Mon 4/5

19:14-07:30

1 stop20h 16m

Sydney Kingsford Smith

Mon 11/5

09:10-12:34

1 stop19h 24m

$1,814

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 12/9

07:05-07:05

1 stop32h 00m

Sydney Kingsford Smith

Sat 26/9

09:10-12:33

1 stop19h 23m

$1,816

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 1/7

17:40-07:05

2 stops21h 25m

Sydney Kingsford Smith

Wed 8/7

17:50-23:06

2 stops21h 16m

$1,835
Fastest return journey

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 26/5

19:05-06:55

1 stop19h 50m

Sydney Kingsford Smith

Sun 7/6

10:20-13:08

1 stop18h 48m

$1,835

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 26/5

15:14-06:50

2 stops23h 36m

Sydney Kingsford Smith

Sun 7/6

09:15-23:55

2 stops30h 40m

$1,841

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 19/5

14:26-06:55

2 stops24h 29m

Sydney Kingsford Smith

Sun 31/5

09:30-21:35

2 stops28h 05m

$1,842

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Wed 20/5

14:33-07:00

2 stops24h 27m

Sydney Kingsford Smith

Mon 1/6

09:30-21:35

2 stops28h 05m

$1,842

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 30/7

17:40-07:05

2 stops21h 25m

Sydney Kingsford Smith

Mon 31/8

17:50-22:40

2 stops20h 50m

$1,899

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Thu 21/5

19:05-06:55

1 stop19h 50m

Sydney Kingsford Smith

Wed 3/6

10:20-17:56

2 stops23h 36m

$1,912

Flights are sorted by cheapest return flights first.

Deals found on 13/4

Sorted by cheapest first

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.

Cheapflights Insights

Everything you need to know about your flight from Boise to Sydney

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

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 50m. 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
Katoomba
Terrigal
Lithgow
Cronulla
Manly
Bondi Beach
Leura
Randwick
Coogee

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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