BOI - SYD

$1,122 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 5/1. 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
$1,185
Typical prices: $1,267-$1,479
American Airlines
Fri 5/1Sat 5/9
BOI - SYD • 2 stops
Cheapest one-way
$2,972
Multiple Airlines
Wed 4/1
BOI - SYD • 3 stops
Top airlines
American Airlines
Cheapest • from $1,185 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+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

Fri, May 1 - Sat, May 9
American Airlines Logo
6:26 pm - 7:05 am
BOI
-
SYD
20h 39m
2 stops
American Airlines Logo
9:10 am - 5:53 pm
SYD
-
BOI
24h 43m
2 stops
$1,185American Airlines
Fri, May 1 - Sat, May 9
American Airlines Logo
2:14 pm - 7:05 am
BOI
-
SYD
24h 51m
2 stops
American Airlines Logo
12:00 pm - 10:54 pm
SYD
-
BOI
26h 54m
1 stop
$1,186American Airlines
Wed, Apr 1 - Wed, Apr 8
Multiple Airlines Logo
8:07 am - 7:30 am
BOI
-
SYD
30h 23m
1 stop
Multiple Airlines Logo
5:50 pm - 11:02 pm
SYD
-
BOI
21h 12m
1 stop
$1,194Multiple Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
12:31 pm - 7:30 am
BOI
-
SYD
25h 59m
2 stops
American Airlines Logo
9:10 am - 5:53 pm
SYD
-
BOI
24h 43m
2 stops
$1,209American Airlines
Sat, Apr 25 - Tue, Apr 28
Multiple Airlines Logo
7:14 pm - 7:30 am
BOI
-
SYD
20h 16m
1 stop
Multiple Airlines Logo
9:25 pm - 10:27 pm
SYD
-
BOI
17h 02m
1 stop
$1,215Multiple Airlines
Sat, Apr 25 - Tue, Apr 28
Multiple Airlines Logo
7:14 pm - 7:30 am
BOI
-
SYD
20h 16m
1 stop
Multiple Airlines Logo
5:10 pm - 11:01 pm
SYD
-
BOI
21h 51m
2 stops
$1,216Multiple Airlines
Mon, Mar 23 - Thu, Mar 26
American Airlines Logo
7:00 am - 6:55 am
BOI
-
SYD
30h 55m
1 stop
American Airlines Logo
1:05 pm - 10:23 pm
SYD
-
BOI
26h 18m
1 stop
$1,235American Airlines
Fri, May 1 - Sat, May 9
United Airlines Logo
6:58 pm - 6:55 am
BOI
-
SYD
19h 57m
1 stop
United Airlines Logo
10:20 am - 11:27 am
SYD
-
BOI
17h 07m
1 stop
$1,236United Airlines
Mon, Mar 23 - Thu, Mar 26
American Airlines Logo
12:31 pm - 7:25 am
BOI
-
SYD
25h 54m
2 stops
American Airlines Logo
11:20 am - 6:02 pm
SYD
-
BOI
23h 42m
2 stops
$1,238American Airlines
Mon, Mar 30 - Mon, Apr 6
Delta Logo
9:00 am - 7:50 am
BOI
-
SYD
29h 50m
2 stops
Delta Logo
9:15 am - 10:11 pm
SYD
-
BOI
28h 56m
2 stops
$1,255Delta
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.

Which airlines provide the cheapest flights from Boise to Sydney?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Boise to Sydney were found on American Airlines ($1,185) and United Airlines ($1,236).

Find deals

Good to know

Low seasonOctober
Cheapest flight$1,185
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 12% 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 $620 for a one-way ticket and $1,185 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 9299 reviews
7.3Comfort
8.1Crew
6.6Food
7.7Boarding
7.1Entertainment
Airline reviews

Entertainment kept turning itself off. Gave up on watching a movie.

8.0 ExcellentLeslie, Feb 2026
SFO - YYZ
Read more United Airlines reviews

Entertainment kept turning itself off. Gave up on watching a movie.

Both the WIFI and entertainment did not work for 2.5h

The crew made our experience extremely bad. They were rude and didn’t have anything for kids.

Very old flight - time to retire it for newer airplanes

2+ hours delayed Outlet in row 12 did not work Tv monitors did not work Lights kept off the entire flight for at 5pm-7pm flight

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Do not like the size of the overhead bin. I think staff should monitor the size of suitcases that are being carried on by passengers to ensure they meet the size requirement.

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Both of my flights arrived early and check in process was smooth

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

Information on your arrival and departure airports

Boise (BOI)
Sydney (SYD)