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Cheap flights from Boston to Sydney from $776

BOS — SYD
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Boston to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Boston to Sydney

Mon 26/1014:25 -
1 stop27h 35m
Wed 4/1111:10 -
1 stop26h 48m
Deal found 26/10$1,848
Tue 27/1016:58 -
2 stops35h 47m
Thu 12/1121:40 -
2 stops24h 06m
Deal found 26/10$1,853
Wed 28/1014:25 -
1 stop25h 00m
Wed 11/1111:10 -
1 stop21h 19m
Deal found 26/10$1,864
Sun 8/1111:55 -
2 stops29h 10m
Mon 23/1111:20 -
1 stop21h 33m
Deal found 28/10$1,874
Mon 2/1113:29 -
2 stops27h 36m
Mon 16/1111:20 -
1 stop21h 33m
Deal found 26/10$1,878
Wed 4/1114:25 -
1 stop26h 35m
Wed 11/1111:10 -
1 stop26h 48m
Deal found 27/10$1,881
Sun 8/1109:00 -
1 stop32h 20m
Sat 6/211:50 -
2 stops28h 09m
Deal found 25/10$1,882
Mon 26/1008:25 -
2 stops33h 10m
Wed 4/1114:05 -
2 stops33h 10m
Deal found 26/10$1,887
Mon 2/1118:01 -
1 stop23h 19m
Mon 16/1111:50 -
1 stop20h 59m
Deal found 27/10$1,888
Tue 27/1014:25 -
1 stop27h 35m
Tue 10/1111:10 -
1 stop26h 48m
Deal found 27/10$1,891

Find flight deals from Boston to Sydney

Round-trip from

$1,843

One-way from

$776

Popular in

December

Cheapest in

May

Average price

$2,000
Delta
  • Delta
  • 22/1-3/3
  • 3 total stops
  • 90h 40m total
  • Boston to Sydney
Search Deals
28/3-31/12
  • 28/3-31/12
  • 2 total stops
  • 36h 15m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($328 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($82 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
Search Deals

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

Price

Cheapest return flight

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 28/3

06:30-09:45

2 stops36h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$776

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 15/11

08:25-09:05

1 stop32h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$997

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 25/1

13:16-08:30

2 stops27h 14m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 20/1

13:48-09:20

1 stop27h 32m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 19/1

10:45-06:50

2 stops28h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 19/1

09:15-06:20

1 stop29h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 16/2

08:19-09:05

1 stop32h 46m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048
Fastest return journey

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 1/2

13:48-06:20

1 stop24h 32m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 17/2

05:45-06:20

3 stops32h 35m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 3/2

12:26-09:05

3 stops28h 39m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,048

Flights are sorted by cheapest return flights first.

Deals found on 28/10

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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.
Estimated return price

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?

The best time to book flights from Boston to Sydney is 1 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 $1,790). Flying from Boston to Sydney in December is currently the most expensive (average of $2,638). 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 $1,895 and $2,206 in January.
The cheapest return price found within the last 5 days was $1,843 on Delta (22 Jan–3 Mar).

Reviews of airlines servicing Sydney

Check out reviews from past customers who have flown with Qantas Airways and United Airlines from Boston to Sydney to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
1,121 reviews
Check prices

Overall

7.5

Boarding

7.7

Entertainment

7.2

Comfort

7.5

Food

7.0

Crew

8.1

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.
Qantas Airways
7.5
Good
1,121 reviews
Qantas Airways
7.5
Good
1,121 reviews
Check prices

Overall

7.5

Boarding

7.7

Entertainment

7.2

Comfort

7.5

Food

7.0

Crew

8.1

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.
United Airlines
7.3
Good
10,453 reviews
Qantas Airways
7.5
Good
1,121 reviews
Check prices

Overall

7.5

Boarding

7.7

Entertainment

7.2

Comfort

7.5

Food

7.0

Crew

8.1

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.

Related info for your journey

  • How long is the flight from Boston to Sydney?

    For as low as $1,972, Delta can have you in Sydney from Boston in 29h 35m. Airlines will cover a distance of 16240 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from Boston to Sydney round-trip?

    Flying on Qantas Airways is currently your cheapest option to Sydney, with prices starting at $1,622. Another option worth looking into is United Airlines, starting at $1,755 round trip. Qantas Airways is 19% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Boston to Sydney one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $644. Users have also found prices from $875 and $880 on Qantas Airways and American Airlines, respectively.

  • Can I find deals for flights from Boston to Sydney that include hotel bookings?

    Yes. In addition to deals on Boston to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Boston to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Sydney.

  • Can I find deals for business class flights from Boston to Sydney?

    Yes. Cheapflights offers flight deals from Boston to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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 $1,790). Flying from Boston to Sydney in December is currently the most expensive (average of $2,638). 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.

See more FAQs

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Manly
Cronulla
Lithgow
Terrigal
Katoomba
Randwick
Leura
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from Boston to Sydney

AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,622Average$2,130FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
United AirlinesCheapest$1,755Average$1,932FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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Why should you use Cheapflights to find cheap flight tickets from Boston to Sydney?

Cheapflights helps you find that perfect flight to Sydney from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Boston to Sydney with no change fees?

Certainly. Search results for flights to Sydney from Boston shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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