BOI - SYD

$999 Find Cheap Flights from Boise to Sydney

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 8/27. 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

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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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

Wed, Aug 27 - Fri, Dec 19
United Airlines Logo
5:39 pm - 6:55 amBOI-SYD
45h 16m2 stops
United Airlines Logo
2:00 pm - 7:13 pmSYD-BOI
23h 13m1 stop
$999United Airlines
Find Deal
Tue, Feb 3 - Sat, Feb 21
United Airlines Logo
10:40 am - 9:15 amBOI-SYD
28h 35m1 stop
United Airlines Logo
11:20 am - 1:30 pmSYD-BOI
20h 10m1 stop
$1,082United Airlines
Find Deal
Tue, Feb 3 - Thu, Feb 12
United Airlines Logo
2:43 pm - 9:15 amBOI-SYD
24h 32m2 stops
United Airlines Logo
11:20 am - 5:55 pmSYD-BOI
24h 35m2 stops
$1,086United Airlines
Find Deal
Thu, Sep 11 - Tue, Sep 16
Delta Logo
4:20 pm - 6:35 amBOI-SYD
22h 15m2 stops
Delta Logo
9:25 am - 12:15 amSYD-BOI
30h 50m2 stops
$1,087Delta
Find Deal
Wed, Nov 19 - Wed, Feb 18
Air New Zealand Logo
2:11 pm - 9:45 pmBOI-SYD
37h 34m2 stops
Air New Zealand Logo
11:45 am - 10:22 pmSYD-BOI
28h 37m2 stops
$1,143Air New Zealand
Find Deal
Wed, Aug 27 - Tue, Dec 16
Delta Logo
3:45 pm - 6:35 amBOI-SYD
22h 50m1 stop
Delta Logo
10:40 am - 2:27 pmSYD-BOI
21h 47m1 stop
$1,183Delta
Find Deal
Tue, Feb 3 - Thu, Feb 12
 Logo
7:00 pm - 12:30 pmBOI-SYD
23h 30m2 stops
 Logo
9:00 am - 10:59 pmSYD-BOI
31h 59m3 stops
$1,745
Find Deal
Tue, Feb 3 - Thu, Feb 12
 Logo
7:30 am - 5:40 pmBOI-SYD
40h 10m3 stops
 Logo
7:45 am - 10:59 pmSYD-BOI
33h 14m3 stops
$2,077
Find Deal
Tue, Feb 3 - Sat, Feb 21
Air Tahiti Nui Logo
7:00 pm - 5:40 pmBOI-SYD
28h 40m3 stops
Air Tahiti Nui Logo
7:15 pm - 10:59 pmSYD-BOI
45h 44m3 stops
$2,083Air Tahiti Nui
Find Deal
Tue, Dec 30 - Sun, Feb 15
Air Tahiti Nui Logo
7:15 am - 5:40 pmBOI-SYD
40h 25m3 stops
Air Tahiti Nui Logo
7:05 am - 10:59 pmSYD-BOI
33h 54m2 stops
$2,586Air Tahiti Nui
Find Deal
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?

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 May, where tickets cost $1,031 (return) on average. On the other hand, the most expensive months are January and December, where the average cost of round-trip tickets is $1,611 and $1,599 respectively.

Good to know

Low seasonJuly
Cheapest flight$999
Best time to beat the crowds but there is an average 10% increase in price.
Most popular time to fly and prices are also 4% lower on average.
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 $999 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, and SkyTeam are the airline alliances operating flights between Boise and Sydney, with Star Alliance being the most commonly used for this route.

  • 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 airlines 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 8925 reviews
6.6Food
8.1Crew
7.3Comfort
7.7Boarding
7.1Entertainment
Airline reviews

It is clear that someone knew, and competent, is in charge of food at United Airlines at least for the international flights. I was flying in coach, but the choices of the dinner were excellent. Tasty, and appropriate size. I had the beef, which was a little bit like a shepherds pie, and it was good. Nothing comparable has been served on a United flight in years. It will not be confused with three star food, but it is very good for airline food. Even better was the breakfast choice between a cinnamon roll and a breakfast sandwich. I chose the breakfast sandwich which was absolutely delicious and which I would happily order again at my local Starbucks or Panera. It is clear that someone knew indifferent is in charge of the food and it’s about time.

10.0 ExcellentAnonymous, Aug 2025TPA - IAD
Read more United Airlines reviews

It is clear that someone knew, and competent, is in charge of food at United Airlines at least for the international flights. I was flying in coach, but the choices of the dinner were excellent. Tasty, and appropriate size. I had the beef, which was a little bit like a shepherds pie, and it was good. Nothing comparable has been served on a United flight in years. It will not be confused with three star food, but it is very good for airline food. Even better was the breakfast choice between a cinnamon roll and a breakfast sandwich. I chose the breakfast sandwich which was absolutely delicious and which I would happily order again at my local Starbucks or Panera. It is clear that someone knew indifferent is in charge of the food and it’s about time.

The flight was comfortable with the exit row and great service

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

The pilots were late and it made us 1 hour late. The meat was tough and bok choy was also tough.

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

The service was good, the food could have been better.

Staff was rude. Didn’t give water for 2 hours. Worst service

Any flight to ORD after about 2pm this summer has been challenging. Flight was delayed getting in (coming from ORD) and that led to it not leaving before a ground stop due to lightening before they could fuel the plane, and so forth. They made up some time but we were still late in arriving at ORD, and that led to missed connections.

Food was ok, but not as good as I have had before on AA.

No issues. They did change our gate FOUR times in about 30 minutes which was mildly annoying but the flight was fine.

Great flight. No issues at all. I still think boarding could be more efficient but otherwise, a good experience.

Pretty good. The food was just mediocre, the boarding and crew were good.

The comfort of the seats was great, the crew eased my child’s anxieties and the fact that I had full cans of my beverage choice was great.

My flight got switched and my prepaid bag didnt transfer over properly so I paid to check ANOTHER BAG. I was placed in a middle seat and it was just miserable. At least it was a bulkhead row so I had legroom. The flight just never seem3d to end

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

Sat on the ground in Cincinnati for 50 minutes before deplaning

While waiting to claim my checked luggage, I discovered the airline had lost it. After a long wait and inquiries, I discovered it was on another flight. Fortunately, the airline finally sent my luggage home.

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

Information on your arrival and departure airports

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