BOI - SYD

$700 Find Cheap Flights from Boise to Sydney

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to Sydney departing on 9/2. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Sydney

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boise to Sydney, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boise to Sydney, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$1,310
Typical prices: $1,403-$1,206
United Airlines
Sun 10/18Tue 11/3
BOI - SYD • 1 stop
Cheapest one-way
$700
Multiple Airlines
Wed 9/2
BOI - SYD • 2 stops
Top airlines
United Airlines
Cheapest • from $1,310 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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
Dallas (DFW)
Cheapest • Avg $1,307 (round-trip)
San Francisco (SFO)
Shortest trip • 20h 47m (one-way)
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 100% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
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, Oct 18 - Tue, Nov 3
United Airlines Logo
2:45 pm - 7:55 am
BOI
-
SYD
24h 10m
1 stop
United Airlines Logo
12:10 pm - 4:49 pm
SYD
-
BOI
22h 39m
1 stop
$1,310United Airlines
Sun, Oct 18 - Tue, Nov 3
United Airlines Logo
7:05 pm - 7:55 am
BOI
-
SYD
19h 50m
1 stop
United Airlines Logo
12:10 pm - 5:55 pm
SYD
-
BOI
23h 45m
2 stops
$1,314United Airlines
Fri, Jul 3 - Fri, Jul 10
United Airlines Logo
7:05 pm - 6:55 am
BOI
-
SYD
19h 50m
1 stop
United Airlines Logo
10:20 am - 1:08 pm
SYD
-
BOI
18h 48m
1 stop
$1,394United Airlines
Fri, Jul 3 - Fri, Jul 10
United Airlines Logo
2:41 pm - 7:00 am
BOI
-
SYD
24h 19m
2 stops
United Airlines Logo
10:20 am - 1:08 pm
SYD
-
BOI
18h 48m
1 stop
$1,398United Airlines
Thu, Jul 30 - Mon, Aug 31
Multiple Airlines Logo
7:07 pm - 7:05 am
BOI
-
SYD
19h 58m
1 stop
Multiple Airlines Logo
6:25 am - 12:33 pm
SYD
-
BOI
22h 08m
2 stops
$1,461Multiple Airlines
Thu, Jul 30 - Mon, Aug 31
Multiple Airlines Logo
7:07 pm - 7:05 am
BOI
-
SYD
19h 58m
1 stop
Multiple Airlines Logo
6:25 am - 12:33 pm
SYD
-
BOI
22h 08m
2 stops
$1,463Multiple Airlines
Thu, Jun 11 - Wed, Jun 17
Air New Zealand Logo
2:05 pm - 6:55 am
BOI
-
SYD
24h 50m
1 stop
Air New Zealand Logo
10:20 am - 4:44 pm
SYD
-
BOI
22h 24m
1 stop
$1,477Air New Zealand
Thu, Jun 11 - Wed, Jun 17
Air New Zealand Logo
2:40 pm - 7:00 am
BOI
-
SYD
24h 20m
2 stops
Air New Zealand Logo
10:20 am - 4:44 pm
SYD
-
BOI
22h 24m
1 stop
$1,481Air New Zealand
Thu, Jul 30 - Mon, Aug 31
Multiple Airlines Logo
10:35 am - 7:10 pm
BOI
-
SYD
40h 35m
2 stops
Multiple Airlines Logo
11:45 am - 10:27 pm
SYD
-
BOI
26h 42m
2 stops
$1,512Multiple Airlines
Fri, Jul 24 - Mon, Jul 27
Air New Zealand Logo
6:30 am - 7:00 am
BOI
-
SYD
32h 30m
2 stops
Air New Zealand Logo
10:20 am - 9:40 pm
SYD
-
BOI
27h 20m
1 stop
$1,522Air 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.

How much is a round-trip flight from Boise to Sydney?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Boise to Sydney departing in October.

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 December and November, where the average cost of round-trip tickets is $1,459 and $1,362 respectively.

Find deals

Good to know

Low seasonMarch
Cheapest flight$700
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 14% 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 3 days, the lowest price for a flight from Boise to Sydney was $700 for a one-way ticket and $1,310 for a round-trip.

  • 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 9737 reviews
7.7Boarding
7.3Comfort
7.1Entertainment
8.1Crew
6.6Food
Airline reviews

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

2.0 MediocreAnonymous, May 2026
IAD - MUC
Read more United Airlines reviews

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

First class ticket gets you no seat back entertainment? I have to bring my own laptop to see a movie? And most of their movies have ADS? No thank you. Worse: Tiny snacks only on a 2 hr flight?

Late- that’s what United does best. Missed my connection, rebooked to a flight 17 hours later and had to spend $500 on a hotel. What did I get? A $15 meal voucher. What can you get in an airport for $15. I hate United so much.

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No complaints other than luggage carousel was incorrectly guiding passengers to the wrong carousel on the screen.

Did not like that we couldn't complete check in on-line without providing pictures of our passports. Worry about identity theft. We had no delays and boarding was handled In an efficient manner.

We were a little disappointed to not be able to complete check in online without uploading pics of passports. Also we have KTN's and they weren't on our boarding passes when we got to security. Had to trek back to counter to have them fix.

Excellent service in Polaris class IAD to ZRH. Arrived rested and well fed after the overnight flight.

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

Information on your arrival and departure airports

Boise (BOI)
Sydney (SYD)