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Cheap flights from Boston to Sydney from $894

BOS — SYD
15 Oct — 22 Oct1
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 19/1010:40 -
2 stops30h 40m
Mon 26/1010:20 -
2 stops26h 08m
Deal found 14/9$1,433
Sun 25/1010:40 -
2 stops30h 55m
Sat 31/1010:20 -
2 stops26h 08m
Deal found 10/9$1,492
Mon 19/1017:45 -
1 stop23h 20m
Mon 26/1013:05 -
1 stop23h 21m
Deal found 14/9$1,509
Sun 18/1010:40 -
2 stops30h 40m
Mon 2/1111:20 -
2 stops26h 08m
Deal found 10/9$1,524
Wed 21/1010:40 -
2 stops30h 40m
Wed 28/1010:20 -
2 stops38h 43m
Deal found 13/9$1,531
Wed 28/1010:40 -
2 stops30h 55m
Wed 18/1111:20 -
2 stops38h 28m
Deal found 10/9$1,534
Sun 25/1015:30 -
2 stops26h 05m
Mon 2/1111:20 -
2 stops38h 43m
Deal found 10/9$1,535

Find flight deals from Boston to Sydney

Round-trip from

$1,432

One-way from

$894

Popular in

December

Cheapest in

May

Average price

$1,900
Qantas Airways
  • Qantas Airways
  • 26/2-7/3
  • 2 total stops
  • 51h 11m total
  • Boston to Sydney
Search Deals
Qantas Airways
  • Qantas Airways
  • 18/10-31/12
  • 1 total stop
  • 23h 20m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($480 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($126 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 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
Fastest return journey

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 4/11

14:25-09:00

1 stop26h 35m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$927

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 9/11

13:37-08:30

2 stops26h 53m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$936

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 4/11

09:05-08:30

2 stops31h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$936

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 18/10

05:45-08:00

2 stops35h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$971

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 10/2

07:15-07:00

3 stops31h 45m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$978

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 29/9

10:55-06:50

1 stop29h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$978

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 9/11

05:30-09:20

3 stops35h 50m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$978

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 14/2

06:00-06:20

3 stops32h 20m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$978

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sat 24/10

20:31-07:00

2 stops43h 29m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$986

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sat 13/2

17:55-06:20

2 stops44h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-09:00

Nonstop0h 00m

$1,014

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 15 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 $1,765). Flying from Boston to Sydney in December is currently the most expensive (average of $3,020). 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 $1,709 and $2,087 in February.
The cheapest return price found within the last 5 days was $1,432 on Qantas Airways (26 Feb–7 Mar).

Reviews of airlines servicing Sydney

Check out reviews from past customers who have flown with Qantas Airways,United Airlines, andAmerican 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
1,098 reviews
Check prices

Food

7.0

Entertainment

7.2

Boarding

7.7

Comfort

7.4

Crew

8.1

Overall

7.5

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
1,098 reviews
Qantas Airways
7.5
Good
1,098 reviews
Check prices

Food

7.0

Entertainment

7.2

Boarding

7.7

Comfort

7.4

Crew

8.1

Overall

7.5

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
7.4
Good
10,208 reviews
Qantas Airways
7.5
Good
1,098 reviews
Check prices

Food

7.0

Entertainment

7.2

Boarding

7.7

Comfort

7.4

Crew

8.1

Overall

7.5

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.
American Airlines
7.1
Good
12,056 reviews
Qantas Airways
7.5
Good
1,098 reviews
Check prices

Food

7.0

Entertainment

7.2

Boarding

7.7

Comfort

7.4

Crew

8.1

Overall

7.5

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 $1,835, United Airlines can have you in Sydney from Boston in 35h 15m. Airlines will cover a distance of 16240 km.

  • 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 $1,375. Additional round-trip tickets that might be worth considering are offered by American Airlines and United Airlines, with the lowest prices starting at $1,487 and $1,730, respectively. Qantas Airways is 32% 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 $635. Users have also found prices from $863 and $867 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 $1,765). Flying from Boston to Sydney in December is currently the most expensive (average of $3,020). 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
Katoomba
Lithgow
Cronulla
Terrigal
Randwick
Leura
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from Boston to Sydney

AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,375Average$2,035FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,487Average$1,899FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$1,730Average$1,952FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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