BOS - YQY

$794 Find Cheap Flights from Boston 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 Boston to Sydney departing on 3/16. 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

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
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Everything you should know

Cheapest round-trip
$794
Air Canada
Mon 3/16Mon 3/23
BOS - YQY • 1 stop
Cheapest one-way
Multiple Airlines
Sat 1/31
BOS - YQY • multi-stop
Start a new search
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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

Mon, Mar 16 - Mon, Mar 23
Air Canada Logo
3:35 pm - 11:23 pm
BOS
-
YQY
6h 48m
1 stop
Air Canada Logo
5:20 am - 9:32 am
YQY
-
BOS
5h 12m
1 stop
$794Air Canada
Fri, Feb 27 - Mon, Mar 2
Air Canada Logo
3:35 pm - 11:23 pm
BOS
-
YQY
6h 48m
1 stop
Air Canada Logo
5:20 am - 9:32 am
YQY
-
BOS
5h 12m
1 stop
$823Air Canada
Thu, Apr 23 - Tue, Apr 28
Air Canada Logo
6:45 pm - 11:46 am
BOS
-
YQY
16h 01m
1 stop
Air Canada Logo
5:30 am - 9:49 am
YQY
-
BOS
5h 19m
1 stop
$824Air Canada
Fri, Feb 27 - Mon, Mar 2
Air Canada Logo
10:45 am - 11:23 pm
BOS
-
YQY
11h 38m
2 stops
Air Canada Logo
5:20 am - 9:32 am
YQY
-
BOS
5h 12m
1 stop
$831Air Canada
Fri, Feb 27 - Mon, Mar 2
Air Canada Logo
10:45 am - 11:23 pm
BOS
-
YQY
11h 38m
2 stops
Air Canada Logo
5:20 am - 9:32 am
YQY
-
BOS
5h 12m
1 stop
$832Air Canada
Thu, Apr 23 - Tue, Apr 28
Air Canada Logo
6:45 pm - 11:46 am
BOS
-
YQY
16h 01m
1 stop
Air Canada Logo
5:30 am - 3:55 pm
YQY
-
BOS
11h 25m
2 stops
$861Air Canada
Mon, Mar 16 - Mon, Mar 23
Air Canada Logo
3:35 pm - 11:23 pm
BOS
-
YQY
6h 48m
1 stop
Air Canada Logo
5:20 am - 3:57 pm
YQY
-
BOS
11h 37m
2 stops
$867Air Canada
Fri, Feb 27 - Mon, Mar 2
Air Canada Logo
4:35 pm - 11:23 pm
BOS
-
YQY
29h 48m
2 stops
Air Canada Logo
12:15 pm - 2:52 pm
YQY
-
BOS
27h 37m
2 stops
$885Air Canada
Mon, Mar 16 - Mon, Mar 23
Air Canada Logo
6:40 pm - 11:32 am
BOS
-
YQY
15h 52m
2 stops
Air Canada Logo
5:20 am - 3:57 pm
YQY
-
BOS
11h 37m
2 stops
$950Air Canada
Mon, Feb 23 - Sat, Feb 28
Air Canada Logo
1:00 pm - 11:23 pm
BOS
-
YQY
9h 23m
2 stops
Air Canada Logo
5:20 am - 5:50 pm
YQY
-
BOS
13h 30m
2 stops
$966Air 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 – 86% 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 Toronto (YYZ) offer the most affordable fares, with an average round-trip price of $921.

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 Montreal (YUL) for the shortest journey. The average one-way travel time for flights connecting there is 4h 58m.

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 22m.

Good to know

Cheapest flight$794
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 3 days, the lowest price for a flight from Boston to Sydney was $794 for a round-trip ticket.

  • 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 10668 reviews
6.8Entertainment
7.8Crew
6.3Food
7.1Comfort
7.3Boarding
Airline reviews

The airplane has been replaced and late night layover have been extended from 3 to 7 and the only compensation was a $15 food voucher after most restaurants have been closed, not helping with children after a 18+ hour international flight

2.0 MediocreMohamed, Jan 2026
YUL - YHZ
Read more Air Canada reviews

The airplane has been replaced and late night layover have been extended from 3 to 7 and the only compensation was a $15 food voucher after most restaurants have been closed, not helping with children after a 18+ hour international flight

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

Was notified on a timely manner of any changes, if any, of the flight schedules.

My original flight was cancelled -- but I have to mention the excellent service I was given by the agent working at check-in who found me an earlier flight -- and helped me navigate security, ensured my baggage kept up with the quick check-in and boarding process -- and just generally made the re-booking process a breeze. Thank you! On flight was fine, but we unfortunately meant no in-flight service -- no water, or coffee (it was an early morning flight...), but the crew was pleasant and accommodating throughout.

No in flight entertainment on a 750 mile flight. Made you join their "program" to get it. It was free on my first leg of the flight from Cincinnati to Toronto. In addition, there was brief period of turbulence that prohibited the crew from serving refreshments. They used that short interruption as an excuse to never serve drinks at all. They had ample time to do so and chose not to. They went around serving half cups of water instead rather than have their carts in the aisle with drinks.

Pearson Airport could not properly handle all the passengers who they needed to process in order to properly get them on board. As a result, I missed the departure of my flight from Toronto. The only saving grace is that Air Canada found a flight that only delayed me by one hour. However, this was no thanks to Pearson Airport!

It was great other than the plane was really small

Last minute cancellation, followed by last minute delay with the rescheduled flight. Both due to interval operation issues. Poor resolution.Very disappointing.

On-time boarding, departure, and flight. Electronic notifications about bags for the whole of their own journey too - from when they got accepted into the system through to being loaded onto the plane and then finally being disgorged onto the right carousel. That was an excellent feature.

I had a good experience. I liked being informed about the status of my luggage

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

Information on your arrival and departure airports