BOS - YQY

$340 Find Cheap Flights from Boston to Sydney - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Sydney departing on 10/7. 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 Boston 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 Boston to Sydney, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$728
Air Canada
Wed 10/14Sat 10/17
BOS - YQY • 1 stop
Cheapest one-way
$340
Air Canada
Wed 10/7
BOS - YQY • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Boston and Sydney. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Montreal (YUL)
Cheapest • Avg $871 (round-trip)
Toronto (YYZ)
Shortest trip • 5h 32m (one-way)
Insights
Insights
Insights
Insights
Start a new search
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 Boston to Sydney (BOS-YQY)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston 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 Boston to Sydney

Wed, Oct 14 - Sat, Oct 17
Air Canada Logo
10:40 am - 4:38 pm
BOS
-
YQY
4h 58m
1 stop
Air Canada Logo
5:20 pm - 9:26 pm
YQY
-
BOS
5h 06m
1 stop
$728Air Canada
Fri, Sep 4 - Mon, Sep 7
Air Canada Logo
4:55 pm - 12:12 am
BOS
-
YQY
6h 17m
1 stop
Air Canada Logo
5:20 pm - 9:26 pm
YQY
-
BOS
5h 06m
1 stop
$733Air Canada
Wed, Oct 14 - Sat, Oct 17
Air Canada Logo
6:00 am - 4:38 pm
BOS
-
YQY
9h 38m
2 stops
Air Canada Logo
5:20 pm - 9:26 pm
YQY
-
BOS
5h 06m
1 stop
$736Air Canada
Wed, Oct 14 - Sat, Oct 17
Air Canada Logo
6:00 am - 4:38 pm
BOS
-
YQY
9h 38m
2 stops
Air Canada Logo
5:20 pm - 8:52 am
YQY
-
BOS
16h 32m
2 stops
$759Air Canada
Tue, Jul 21 - Tue, Jul 28
Air Canada Logo
10:40 am - 4:14 pm
BOS
-
YQY
4h 34m
1 stop
Air Canada Logo
5:05 pm - 9:27 pm
YQY
-
BOS
5h 22m
1 stop
$762Air Canada
Wed, Jul 15 - Fri, Jul 17
Air Canada Logo
4:55 pm - 12:07 am
BOS
-
YQY
6h 12m
1 stop
Air Canada Logo
5:05 pm - 9:27 pm
YQY
-
BOS
5h 22m
1 stop
$767Air Canada
Tue, Jul 21 - Tue, Jul 28
Air Canada Logo
6:00 am - 4:14 pm
BOS
-
YQY
9h 14m
2 stops
Air Canada Logo
5:05 pm - 9:27 pm
YQY
-
BOS
5h 22m
1 stop
$770Air Canada
Wed, Aug 12 - Wed, Aug 19
Air Canada Logo
6:00 am - 4:20 pm
BOS
-
YQY
9h 20m
2 stops
Air Canada Logo
5:05 am - 11:52 am
YQY
-
BOS
7h 47m
1 stop
$775Air Canada
Wed, Jul 15 - Fri, Jul 17
Air Canada Logo
7:15 pm - 4:14 pm
BOS
-
YQY
19h 59m
2 stops
Air Canada Logo
5:05 pm - 9:27 pm
YQY
-
BOS
5h 22m
1 stop
$785Air Canada
Tue, Jul 21 - Tue, Jul 28
Air Canada Logo
6:00 am - 4:14 pm
BOS
-
YQY
9h 14m
2 stops
Air Canada Logo
5:05 pm - 8:52 am
YQY
-
BOS
16h 47m
2 stops
$793Air Canada
Booking Insights

KAYAK's insights & trends for Boston to Sydney flights

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

What is the most popular layover airport when flying from Boston to Sydney?

Percentage of 1-stop round-trip flights from Boston to Sydney chosen by KAYAK users via each layover airport in the last 12 months (only includes trips with the same layover airport on both legs).

Montreal (YUL) is the top choice – 93% of KAYAK users who clicked on 1-stop flights from Boston to Sydney picked an itinerary connecting there.

What is the cheapest layover airport when flying from Boston to Sydney?

Average round-trip price for 1-stop flights from Boston to Sydney clicked by KAYAK users in the last 12 months (only includes trips with the same layover airport on both legs).

Flights via Montreal (YUL) offer the most affordable fares, with an average round-trip price of $871.

Which layover airport offers the shortest total travel time from Boston to Sydney?

Shortest average total travel time for 1-stop one-way flights from Boston to Sydney via different layover airports, based on KAYAK user data from the last 12 months.

Consider flying via Toronto (YYZ) for the shortest journey. The average one-way travel time for flights connecting there is 5h 32m.

Which layover airport has the quickest connection when flying from Boston to Sydney?

Average layover duration at different layover airports for 1-stop one-way flights from Boston to Sydney, based on KAYAK user data from the last 12 months.

If you prefer a quick connection, Toronto (YYZ) often has the shortest layovers from Boston to Sydney, with an average of 1h 12m.

Find deals

Good to know

Cheapest flight$340
Flight from Boston to Sydney

When to book flights from Boston to Sydney

Are your dates flexible? Find out the best times to travel from Boston 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 Boston to Sydney

  • What is the cheapest flight from Boston to Sydney?

    In the last 5 days, the lowest price for a flight from Boston to Sydney was $340 for a one-way ticket and $728 for a round-trip.

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

    Yes

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

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

  • Which airline alliances offer flights from Boston to Sydney?

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

  • How does KAYAK find such low prices on flights from Boston 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 Boston to Sydney.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from Boston 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 Boston 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 Boston with another airline. Booking your flights between Boston and YQY 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 Boston 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 Boston 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 Boston to Sydney

 
See real verified KAYAK customer reviews for airlines flying from Boston 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 Boston 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.
7.1
Air CanadaOverall score based on 11269 reviews
6.3Food
7.1Comfort
6.8Entertainment
7.8Crew
7.3Boarding
Airline reviews

I bought a ticket from Kayak. When I got to the airport, the was no ticket. I had to pay 5X to get to my destination. No response received from Kayak. I will NEVER use them again.

2.0 MediocreJustin, Apr 2026
BOS - YUL
Read more Air Canada reviews

I bought a ticket from Kayak. When I got to the airport, the was no ticket. I had to pay 5X to get to my destination. No response received from Kayak. I will NEVER use them again.

everything was fine. but paying for 1 piece of check-in luggage and denying passengers to board with carry-on luggage which by air line's standards does not fit is not acceptable. when one travels for a longer time one needs to have some essentials

Old, noisy plane, bad coffee, delayed. Flight attendant was very nice.

No entertainment. Luckily I was the only person in that row. Small seating

Four hour delay, no communication and multiple reasons for delay. Rude counter person even though I had a business class ticket. Bad experience all around.

I really didn't flight from Toronto to Sydney Because my flight was cancelled for the snow But you guys help me lot and put me in the flight from Toronto to Halifax I give you at 10/10 because was really good Just I had to drive 4 hours to be home

I wanted to change the dates of my flight and was not able to do. Had to cancel it without getting any refund. Bad customer support and worst experience ever.

An hour and a half late. Seats as always ridiculously cramped. Beverage options limited. Stale pretzels. The usual…

We had a significant illness at the last minute. Air Canada was unsympathetic and rude and refused to give us any credit on our unused ticket.

Ran wonderfully and smoothly roundtrip. Could not have asked for more from the staff.

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

Information on your arrival and departure airports

Boston (BOS)
Sydney (YQY)