Cheap flights from Boston to Sydney from £413
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/3. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap flight deals from Boston to Sydney
Cheapest flights from Boston to SydneyExplore the most affordable flight options available from Boston to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 October 2026.
Explore the most affordable flight options available from Boston to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 October 2026.
Best flights from Boston to SydneyDiscover carefully curated flight deals from Boston to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 October 2026.
Discover carefully curated flight deals from Boston to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 October 2026.
Last-minute flights from Boston to SydneyDiscover last-minute flight deals from Boston to Sydney. Data last updated 9 October 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Sydney. Data last updated 9 October 2026 and is based on user searches.
One-way flights from Boston to SydneySearch for one-way flight options from Boston to Sydney. Find affordable one-way fares based on user searches. Data last updated 9 October 2026.
Search for one-way flight options from Boston to Sydney. Find affordable one-way fares based on user searches. Data last updated 9 October 2026.
Find flight deals from Boston to Sydney
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 9 October 2026.
Cheapflights Fare Finder
Use the filters below to find and compare flights from Boston to Sydney that are best for you.
Fly from
Fly to
Route
Depart
Return
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Sun 15/11
13:32-09:20
2 stops27h 48m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Sun 1/11
18:01-09:20
1 stop23h 19m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Mon 7/12
05:45-09:20
3 stops35h 35m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Tue 17/11
05:30-09:20
3 stops35h 50m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Tue 9/2
12:26-09:05
3 stops28h 39m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Sat 5/12
19:33-06:20
2 stops42h 47m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Sat 13/2
20:15-06:20
1 stop42h 05m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Thu 29/10
08:25-09:20
3 stops33h 55m
Sydney Kingsford Smith
Wed 31/12
00:00-09:00
Nonstop0h 00m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Tue 20/10
08:05-07:55
2 stops32h 50m
Sydney Kingsford Smith
Tue 3/11
11:20-16:53
1 stop21h 33m
BostonSydney
BOS Boston Logan Intl - SYD Sydney Kingsford Smith
BOSSYD
Boston Logan Intl
Fri 23/10
08:05-07:55
2 stops32h 50m
Sydney Kingsford Smith
Mon 2/11
11:50-23:59
2 stops28h 09m
Best time to book a flight from Boston to Sydney
Have a flexible travel schedule? Discover the best time to fly to Sydney from Boston with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Boston to Sydney
How far ahead should I book a flight from Boston to Sydney?
To ensure you get the cheapest price possible for a flight from Boston to Sydney, you should look to book at least 1 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Boston to Sydney?
Currently, May is the cheapest month in which you can book a flight from Boston to Sydney (average of £954). Flying from Boston to Sydney in December is currently the most expensive (average of £1,434). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost for a return flight from Boston to Sydney?
Airfare is below average for this route at the moment.
Boston to Sydney flights typically cost between £1,003 and £1,404 in October.The cheapest return price found within the last 5 days was £927 on United Airlines (19 Oct–2 Nov).
Related info for your journey
Find useful and relevant information for your journey from Boston to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Travelling to a place near Sydney?
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Complete your trip
Complete your trip to Sydney by adding a car hire and/or hotel booking to your travel itinerary.
Direct flights to New South Wales
Book a non-stop flight to one of these other cities located in New South Wales.
Search flights from Boston to Sydney by cabin class
Find flights from Boston to Sydney, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Boston and Sydney flights
Browse other Boston and Sydney flight options. Last updated on 9 October 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on 9 October 2026.
Popular flight searches
Check out other popular destinations found by fellow travellers in 2026
Other flights to Sydney
Explore flights to Sydney departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 9 October 2026.
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Boston to Sydney?
Cheapflights helps you search for flights from Boston to Sydney via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets from Boston to Sydney?
By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Sydney from Boston.
Can Cheapflights find flights from Boston to Sydney with no change fees?
Yes, we can. To see specific flights from Boston to Sydney with no change fees, users can toggle flexible booking options after using the search form above to find flights.
Can Cheapflights notify me if prices for flights from Boston to Sydney become cheaper?
Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!