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Cheap flights from Boise to Sydney from $740

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 31/1. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SYD
26 Dec — 2 Jan1
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 26 November 2025.

Round-trip from

$1,795

One-way from

$740

Popular in

December

Cheapest in

September

Average price

$2,108
United Airlines
  • United Airlines
  • 21/1-11/2
  • 2 total stops
  • 52h 08m total
  • Boise to Sydney
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31/1
  • 31/1
  • 3 total stops
  • 48h 40m total
  • Boise to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($344 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease ($53 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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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 26 November 2025.

Tue 30/1214:10BOI - SYD
1 stop25h 05mUnited Airlines
Sun 15/211:20SYD - BOI
1 stop27h 35mUnited Airlines
Deal found 26/11$2,322
Tue 30/1208:40BOI - SYD
2 stops28h 10mDelta
Sun 15/210:40SYD - BOI
2 stops23h 35mDelta
Deal found 25/11$2,329
Mon 24/1114:21BOI - SYD
2 stops24h 39mAmerican Airlines
Mon 1/1211:20SYD - BOI
2 stops23h 35mAmerican Airlines
Deal found 23/11$2,789
Mon 24/1109:59BOI - SYD
2 stops27h 26mMultiple Airlines
Mon 1/1217:45SYD - BOI
1 stop23h 03mMultiple Airlines
Deal found 23/11$2,806
Wed 24/1207:15BOI - SYD
1 stop30h 10mMultiple Airlines
Wed 31/1217:45SYD - BOI
1 stop23h 17mMultiple Airlines
Deal found 24/11$2,972
Wed 24/1210:42BOI - SYD
2 stops28h 23mUnited Airlines
Wed 31/1211:20SYD - BOI
2 stops28h 11mUnited Airlines
Deal found 24/11$3,120
Mon 22/1218:55BOI - SYD
1 stop20h 20mAir New Zealand
Mon 29/1209:55SYD - BOI
2 stops30h 35mAir New Zealand
Deal found 24/11$3,447
Mon 22/1217:23BOI - SYD
2 stops21h 37mAmerican Airlines
Mon 29/1211:20SYD - BOI
2 stops23h 33mAmerican Airlines
Deal found 24/11$3,479

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 26 November 2025.
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

Wed 21/1

14:20-09:15

1 stop24h 55m

Sydney Kingsford Smith

Wed 11/2

12:10-21:23

1 stop27h 13m

$1,795

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 14/3

12:59-09:15

1 stop27h 16m

Sydney Kingsford Smith

Sat 21/3

12:10-16:49

1 stop21h 39m

$1,950

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 28/2

20:12-09:00

1 stop18h 48m

Sydney Kingsford Smith

Wed 4/3

11:20-12:44

1 stop19h 24m

$2,035

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 20/2

08:16-07:25

1 stop29h 09m

Sydney Kingsford Smith

Sun 22/2

14:00-23:00

2 stops27h 00m

$2,059

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 28/2

10:41-08:30

2 stops27h 49m

Sydney Kingsford Smith

Wed 4/3

10:40-12:01

2 stops19h 21m

$2,091

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 13/2

13:36-06:55

1 stop23h 19m

Sydney Kingsford Smith

Mon 16/2

14:05-22:36

1 stop26h 31m

$2,144

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 10/1

05:40-19:45

2 stops20h 05m

Sydney Kingsford Smith

Sun 18/1

21:40-12:54

2 stops33h 14m

$2,212

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Tue 30/12

08:40-06:50

2 stops28h 10m

Sydney Kingsford Smith

Sun 15/2

10:40-16:15

2 stops23h 35m

$2,329

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Sat 31/1

17:55-12:35

3 stops48h 40m

$740

BoiseSydney

BOI - SYD

BOISYD

Boise Air Term. Gowen Fld

Fri 30/1

14:29-06:10

2 stops21h 41m

$885

Flights are sorted by cheapest return flights first.

Deals found on 26/11

Showing 1-10 of 12 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.

Cheapflights Insights

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

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

Currently, September is the cheapest month in which you can book a flight from Boise to Sydney (average of $1,371). Flying from Boise to Sydney in July is currently the most expensive (average of $2,254). 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 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 24h 55m. Airlines will cover a distance of 12704 km.

  • 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.

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

    Currently, September is the cheapest month in which you can book a flight from Boise to Sydney (average of $1,371). Flying from Boise to Sydney in July is currently the most expensive (average of $2,254). 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

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Alternative routes for Boise to Sydney

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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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