BOI - SYD

$1,173 Find Cheap Flights from Boise to Sydney - Compare and Save

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to Sydney departing on 8/16. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$1,173
Multiple Airlines
Sun 8/16Sun 8/23
BOI - SYD • 1 stop
Top airlines
Cheapest • from $1,186 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
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Nonstop flights
Not available
There are currently no direct flights between Boise and Sydney. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $1,307 (round-trip)
Shortest trip • 20h 49m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
+1
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We hope you love your trip to Sydney!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Boise to Sydney (BOI-SYD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boise to Sydney that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boise to Sydney

Sun, Aug 16 - Sun, Aug 23
Multiple Airlines Logo
10:52 am - 6:25 am
BOI
-
SYD
27h 33m
1 stop
Multiple Airlines Logo
9:25 pm - 10:27 pm
SYD
-
BOI
17h 02m
1 stop
$1,173Multiple Airlines
Sun, Aug 16 - Sun, Aug 23
United Airlines Logo
2:44 pm - 7:00 am
BOI
-
SYD
24h 16m
2 stops
United Airlines Logo
10:20 am - 3:31 pm
SYD
-
BOI
21h 11m
1 stop
$1,186United Airlines
Sun, Aug 16 - Sun, Aug 23
American Airlines Logo
1:55 pm - 7:30 am
BOI
-
SYD
25h 35m
2 stops
American Airlines Logo
5:50 pm - 10:58 pm
SYD
-
BOI
21h 08m
2 stops
$1,187American Airlines
Wed, Nov 4 - Wed, Nov 11
Multiple Airlines Logo
10:13 am - 6:25 am
BOI
-
SYD
26h 12m
1 stop
Multiple Airlines Logo
7:00 am - 1:40 pm
SYD
-
BOI
24h 40m
2 stops
$1,196Multiple Airlines
Thu, Aug 13 - Thu, Aug 20
Multiple Airlines Logo
8:03 am - 11:50 am
BOI
-
SYD
35h 47m
2 stops
Multiple Airlines Logo
5:50 pm - 11:00 pm
SYD
-
BOI
21h 10m
1 stop
$1,275Multiple Airlines
Thu, Aug 13 - Thu, Aug 20
Multiple Airlines Logo
6:51 pm - 7:05 am
BOI
-
SYD
20h 14m
1 stop
Multiple Airlines Logo
5:50 pm - 11:00 pm
SYD
-
BOI
21h 10m
1 stop
$1,281Multiple Airlines
Tue, Oct 13 - Thu, Oct 22
Multiple Airlines Logo
2:51 pm - 6:50 pm
BOI
-
SYD
34h 59m
2 stops
Multiple Airlines Logo
8:45 pm - 12:28 pm
SYD
-
BOI
32h 43m
2 stops
$1,283Multiple Airlines
Thu, Aug 13 - Thu, Aug 20
American Airlines Logo
1:55 pm - 7:05 am
BOI
-
SYD
25h 10m
2 stops
American Airlines Logo
5:50 pm - 10:40 pm
SYD
-
BOI
20h 50m
2 stops
$1,287American Airlines
Tue, Oct 13 - Thu, Oct 22
Qantas Airways Logo
6:57 pm - 8:05 am
BOI
-
SYD
20h 08m
1 stop
Qantas Airways Logo
6:50 pm - 10:57 pm
SYD
-
BOI
21h 07m
1 stop
$1,289Qantas Airways
Wed, Nov 4 - Wed, Nov 11
Air New Zealand Logo
6:59 pm - 9:20 am
BOI
-
SYD
20h 21m
1 stop
Air New Zealand Logo
11:50 am - 4:59 pm
SYD
-
BOI
23h 09m
1 stop
$1,293Air New Zealand
Booking Insights

KAYAK's insights & trends for Boise to Sydney flights

Get data-powered insights and trends into flights from Boise to Sydney to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boise to Sydney?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boise to Sydney, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boise to Sydney is January, where tickets cost $0 (return) on average. On the other hand, the most expensive months are November and December, where the average cost of round-trip tickets is $1,616 and $1,466 respectively.

Good to know

Low seasonMarch
Cheapest flight$1,173
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from Boise to Sydney

When to book flights from Boise to Sydney

Are your dates flexible? Find out the best times to travel from Boise to Sydney based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Boise to Sydney

  • What is the cheapest flight from Boise to Sydney?

    In the last 5 days, the lowest price for a flight from Boise to Sydney was $1,173 for a round-trip ticket.

  • Do I need a passport to fly between Boise and Sydney?

    A passport is required to fly from Boise to Sydney.

  • Which aircraft models fly most regularly from Boise to Sydney?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boise to Sydney?

    Star Alliance is the only airline alliance operating flights between Boise and Sydney.

  • How does KAYAK find such low prices on flights from Boise to Sydney?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boise to Sydney.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boise to Sydney?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from Boise is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boise to Sydney?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sydney with an airline and back to Boise with another airline. Booking your flights between Boise and SYD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boise to Sydney?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sydney from Boise up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Boise to Sydney

 
See real verified KAYAK customer reviews for airlines flying from Boise to Sydney. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boise to Sydney? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9927 reviews
6.7Food
7.7Boarding
7.3Comfort
8.1Crew
7.1Entertainment
Airline reviews

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

10.0 ExcellentSteve, May 2026
SFO - SYD
Read more United Airlines reviews

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

My flight time was changed without any notification to me which ruined my time sensitive plans so I ended up completely changing my travel plans and no reimbursement.

Terrible. Our first time back on United for 10 years, the seats in Polaris class are small and uncomfortable. They have squished too many people in to get more $$$. The staff are not friendly and not wanting to accommodate. I asked for two salads rather than a main meal and was advised no we wont do that. Then asked what I would like for breakfast and given something else anyway. I will not be flying United International anytime soon.

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

Smooth flight. As always dinner could have been more generous. Breakfast was great.

Moody attendants that can barely look up at the passengers. I’m all for people having an off day, but you can tell some Untied Airlines Employees have lost their zeal for their jobs

Great checkin experience and flight crew were very friendly and helpful

Staff did not care, and very clearly did not want to be serving passengers. Requests were ignored repeatedly. Toilets filthy. Bins were just trash bags hung around the place that were never emptied. It was a challenge to even get a glass of water on a 14 hour flight.

Got automatically assigned a middle seat, unless I fork out extra money for seat assigment.

Flight was diverted to Canberra because Not enough fuel to circle on Sydney’s skies waiting for showers to pass. After that everything went wrong. It took forever to put fuel. Once back rolling, we stopped short of takeoff because crew had reached maximum work hours per shift. Back to gate we waited and waited in the plane with no water and no food - a total of 4 hours. Received contrasting news about the follow up of our trip. Finally we disembarked but our luggage could not be processed there as not enough custom agents. We ended up on buses and arrived at Sydney airports after a 3 hours trip. There we had to queue in line with 240 more passengers to file a lost luggage claim. We received the luggage after 48 hours, many of which spent holding with non-existent United customer service. Never able to speak to an actual person during those long phone calls. Finally on a chatline I could talk to a baggage agent, who filed another report as our luggage did not appear anywhere in their system. Thus it was surprising to get it back.

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

Information on your arrival and departure airports