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Cheap flights from Boston to Sydney from $793

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
29 May — 5 Jun1
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
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 29 April 2026.

Sat 15/812:30
BOS
-
SYD
2 stops40h 40m
ANA
Sun 30/820:55
SYD
-
BOS
2 stops31h 50m
ANA
Deal found 27/4$1,850
Tue 28/713:37
BOS
-
SYD
2 stops27h 18m
United Airlines
Wed 26/810:20
SYD
-
BOS
1 stop22h 42m
United Airlines
Deal found 27/4$1,866
Mon 4/508:05
BOS
-
SYD
2 stops32h 55m
United Airlines
Mon 11/509:30
SYD
-
BOS
1 stop21h 25m
United Airlines
Deal found 28/4$1,867
Mon 4/509:30
BOS
-
SYD
2 stops31h 20m
Delta
Mon 11/509:15
SYD
-
BOS
2 stops23h 54m
Delta
Deal found 28/4$1,872
Sat 1/820:20
BOS
-
SYD
1 stop44h 35m
United Airlines
Mon 24/810:20
SYD
-
BOS
1 stop20h 45m
United Airlines
Deal found 27/4$1,884
Sat 8/820:20
BOS
-
SYD
1 stop44h 35m
United Airlines
Sun 30/810:20
SYD
-
BOS
1 stop20h 45m
United Airlines
Deal found 28/4$1,885
Sun 23/808:10
BOS
-
SYD
2 stops35h 15m
ANA
Tue 1/920:55
SYD
-
BOS
2 stops31h 50m
ANA
Deal found 28/4$1,889
Sat 2/516:52
BOS
-
SYD
2 stops48h 03m
United Airlines
Sun 17/509:30
SYD
-
BOS
2 stops23h 56m
United Airlines
Deal found 28/4$1,898
Mon 11/510:35
BOS
-
SYD
2 stops30h 45m
Air Canada
Tue 16/609:20
SYD
-
BOS
2 stops38h 25m
Air Canada
Deal found 28/4$1,921
Wed 4/1121:00
BOS
-
SYD
2 stops30h 50m
Turkish Airlines
Fri 13/1121:45
SYD
-
BOS
2 stops36h 20m
Turkish Airlines
Deal found 27/4$1,924
Thu 30/718:26
BOS
-
SYD
1 stop22h 34m
United Airlines
Wed 26/809:30
SYD
-
BOS
1 stop21h 53m
United Airlines
Deal found 27/4$1,935

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 29 April 2026.

Round-trip from

$1,850

One-way from

$793

Popular in

December

Cheapest in

September

Average price

$2,122
ANA
  • ANA
  • 15/8-30/8
  • 4 total stops
  • 72h 30m total
  • Boston to Sydney
Search Deals
1/9
  • 1/9
  • 3 total stops
  • 40h 05m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($359 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($92 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Boston to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 29 April 2026.
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 - SYD

BOSSYD

Boston Logan Intl

Mon 11/5

18:01-06:55

1 stop22h 54m

Sydney Kingsford Smith

Tue 16/6

10:20-21:21

1 stop25h 01m

$1,867

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 8/8

13:37-06:55

2 stops27h 18m

Sydney Kingsford Smith

Sun 30/8

09:30-20:59

2 stops25h 29m

$1,937
Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 30/7

18:26-07:00

1 stop22h 34m

Sydney Kingsford Smith

Sun 23/8

09:30-17:23

1 stop21h 53m

$1,937

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 30/5

15:15-06:50

2 stops25h 35m

Sydney Kingsford Smith

Thu 11/6

09:15-23:54

1 stop28h 39m

$1,953

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 12/6

18:26-07:00

1 stop22h 34m

Sydney Kingsford Smith

Fri 19/6

09:30-21:53

2 stops26h 23m

$2,012

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 18/10

15:10-07:50

2 stops25h 40m

Sydney Kingsford Smith

Tue 3/11

10:40-19:11

2 stops24h 31m

$2,040

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 11/9

10:35-06:50

2 stops30h 15m

Sydney Kingsford Smith

Sun 27/9

09:15-19:38

1 stop24h 23m

$2,109

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/8

08:00-06:50

2 stops32h 50m

Sydney Kingsford Smith

Thu 20/8

09:15-19:38

1 stop24h 23m

$2,215

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 5/8

10:55-06:50

1 stop29h 55m

Sydney Kingsford Smith

Sat 22/8

09:15-19:13

2 stops23h 58m

$2,215

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/8

06:03-18:50

2 stops46h 47m

Sydney Kingsford Smith

Thu 20/8

20:45-15:49

2 stops33h 04m

$2,314

Flights are sorted by cheapest return flights first.

Deals found on 25/4

Showing 1-10 of 19 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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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 72 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, September is the cheapest month in which you can book a flight from Boston to Sydney (average of $1,700). Flying from Boston to Sydney in December is currently the most expensive (average of $2,796). 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?

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sydney. Reviews last updated 29 April 2026.
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
1,028 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

7.0

Overall

7.5

Entertainment

7.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Apr 2026

AKL - ADL

Poor as usual. Flight was delayed for more than 4 hours. The Staff was rude. Food was terrible. Very unreliable, unprofessional and unpleasant.
Qantas Airways
7.5
Good
1,028 reviews
Qantas Airways
7.5
Good
1,028 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

7.0

Overall

7.5

Entertainment

7.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Apr 2026

AKL - ADL

Poor as usual. Flight was delayed for more than 4 hours. The Staff was rude. Food was terrible. Very unreliable, unprofessional and unpleasant.
United Airlines
7.4
Good
9,680 reviews
Qantas Airways
7.5
Good
1,028 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

7.0

Overall

7.5

Entertainment

7.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Apr 2026

AKL - ADL

Poor as usual. Flight was delayed for more than 4 hours. The Staff was rude. Food was terrible. Very unreliable, unprofessional and unpleasant.

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.

  • How long is the flight from Boston to Sydney?

    For as low as $1,867, United Airlines can have you in Sydney from Boston in 22h 54m. 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 $1,368. Another option worth looking into is United Airlines, starting at $1,622 round trip. Qantas Airways is 34% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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, September is the cheapest month in which you can book a flight from Boston to Sydney (average of $1,700). Flying from Boston to Sydney in December is currently the most expensive (average of $2,796). 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
Katoomba
Terrigal
Lithgow
Cronulla
Manly
Bondi Beach
Leura
Randwick
Coogee

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 2 airlines flying from Boston to Sydney

Discover the top 2 airlines that operate flights from Boston to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 29 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,368Average$3,216FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
United AirlinesCheapest$1,622Average$1,999FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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 goes through 900+ travel sites to look for the best flight deals for flights from Boston to Sydney. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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.

Can Cheapflights notify me if prices for flights from Boston to Sydney become cheaper?

Of course! You can now track prices for flights from Boston to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.