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$459+ Cheap flights from Boston (BOS) to Sydney (SYD)

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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Cheap flight deals from Boston to Sydney

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 March 10, 2026.

This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/171:57 pm
BOS
-
SYD
2 stops26h 03m
United Airlines
Thu 3/2611:50 am
SYD
-
BOS
1 stop21h 38m
United Airlines
Deal found 3/5$1,167
This Air Canada deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:25 pm
BOS
-
SYD
2 stops46h 55m
Air Canada
Sun 7/129:20 am
SYD
-
BOS
2 stops51h 18m
Air Canada
Deal found 3/6$1,168
This Air Canada deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:50 am
BOS
-
SYD
2 stops35h 30m
Air Canada
Mon 7/139:20 am
SYD
-
BOS
2 stops44h 48m
Air Canada
Deal found 3/6$1,171
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1412:55 pm
BOS
-
SYD
2 stops27h 55m
Delta
Thu 10/299:40 am
SYD
-
BOS
2 stops24h 31m
Delta
Deal found 3/5$1,172
This Ovago deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/710:45 am
BOS
-
SYD
1 stop30h 35m
ANA
Tue 4/149:20 am
SYD
-
BOS
2 stops38h 39m
ANA
Deal found 3/8$1,173
This KAYAK deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:55 am
BOS
-
SYD
1 stop34h 20m
Air New Zealand
Sun 3/2212:10 pm
SYD
-
BOS
1 stop27h 39m
Air New Zealand
Deal found 3/7$1,175
This Air Canada deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:00 pm
BOS
-
SYD
2 stops28h 20m
Air Canada
Tue 4/289:20 am
SYD
-
BOS
2 stops38h 29m
Air Canada
Deal found 3/7$1,176
This Air Canada deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:35 am
BOS
-
SYD
2 stops30h 45m
Air Canada
Wed 6/179:20 am
SYD
-
BOS
2 stops38h 30m
Air Canada
Deal found 3/7$1,177
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:15 pm
BOS
-
SYD
1 stop44h 40m
United Airlines
Sat 10/2411:20 am
SYD
-
BOS
1 stop20h 47m
United Airlines
Deal found 3/5$1,179
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/158:00 am
BOS
-
SYD
2 stops37h 30m
Qantas Airways
Wed 7/229:10 am
SYD
-
BOS
1 stop21h 25m
Qantas Airways
Deal found 3/6$1,180
This Air Canada deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1410:40 am
BOS
-
SYD
2 stops30h 40m
Air Canada
Wed 10/2810:20 am
SYD
-
BOS
3 stops38h 17m
Air Canada
Deal found 3/9$1,181
This Orbitz deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:00 am
BOS
-
SYD
2 stops35h 20m
Air Canada
Wed 10/2110:20 am
SYD
-
BOS
2 stops26h 07m
Air Canada
Deal found 3/9$1,182

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,167
(United Airlines)

One-way from

$459
(Air Canada)

Popular in

December

Cheapest in

September

Average price

$1,317
Provider with most accurate pricing for Boston Logan Intl-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Sydney Kingsford Smith flights.
Search Deals
From Boston Logan Intl to Sydney Kingsford Smith
Search Deals
One-way flight from Boston Logan Intl to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($185 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated March 10, 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 round-trip

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 5/3

9:30 am-6:50 am

2 stops31h 20m

Sydney Kingsford Smith

Sat 5/9

9:15 am-7:22 pm

1 stop24h 07m

$1,172

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 6/5

12:30 pm-7:00 am

2 stops28h 30m

Sydney Kingsford Smith

Fri 6/26

10:20 am-7:30 pm

2 stops23h 10m

$1,212

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 8/6

7:00 am-10:30 am

2 stops37h 30m

Sydney Kingsford Smith

Fri 8/21

9:10 am-11:46 pm

1 stop28h 36m

$1,270

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 8/7

7:00 am-9:45 am

2 stops36h 45m

Sydney Kingsford Smith

Tue 8/18

6:25 am-11:46 pm

2 stops31h 21m

$1,277

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 4/6

10:00 pm-7:55 pm

2 stops31h 55m

Sydney Kingsford Smith

Sun 4/19

8:45 pm-3:05 pm

1 stop32h 20m

$1,390

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 4/23

10:00 pm-5:10 pm

1 stop29h 10m

Sydney Kingsford Smith

Thu 4/30

8:45 pm-3:05 pm

1 stop32h 20m

$1,443

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 5/11

9:20 am-8:45 am

3 stops33h 25m

Sydney Kingsford Smith

Tue 6/16

7:50 am-9:39 am

3 stops39h 49m

$1,446

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 8/23

9:40 am-8:45 am

3 stops33h 05m

Sydney Kingsford Smith

Sun 8/30

11:55 am-5:50 am

2 stops31h 55m

$1,468

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 7/1

6:00 pm-7:05 am

1 stop23h 05m

Sydney Kingsford Smith

Fri 7/31

12:00 pm-10:01 pm

1 stop24h 01m

$1,543

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 8/5

7:36 pm-6:50 pm

2 stops33h 14m

Sydney Kingsford Smith

Sat 8/22

8:45 pm-6:02 am

2 stops47h 17m

$1,557

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Boston to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Sydney in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
oojoPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Sydney flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Sydney. Price data was last updated on March 6, 2026.

To ensure you get the cheapest price possible for a flight from Boston to Sydney, you should look to book at least 73 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, September is the cheapest month in which you can book a flight from Boston to Sydney (average of $251). Flying from Boston to Sydney in January is currently the most expensive (average of $1,100). 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 to fly round-trip 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 March 10, 2026.
See what other customers who have flown with Delta,Qantas Airways, andUnited Airlines from Boston to Sydney have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Food

7.2

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,276 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Food

7.2

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Qantas Airways
7.5
Good
1,002 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Food

7.2

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,409 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Food

7.2

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.1
Good
11,414 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Food

7.2

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,800 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Food

7.2

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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?

    A quick flight from Boston to Sydney can take about 28h 30m. Delta provides one of the quickest options available for as low as $1,212. There are 10091 mi between Boston and Sydney. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Cheapflights users have booked flights from Boston to Sydney round-trip from $251. Other airlines that can offer you cheap pricing are Delta, from $318, and Fiji Airways, from $731. You may be able to fly from Boston to Sydney for 83% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from Boston to Sydney are Air Canada ($459), Qatar Airways ($498), and Qantas Airways ($569).

  • Where are the most common layover locations when flying from Boston to Sydney?

    Boston to Sydney flights have a layover in Los Angeles most of the time.

  • What are some popular things to do or see while on a layover in Los Angeles?

    Most Los Angeles visitors opt to spend their time experiencing Hollywood Bowl, Hollywood Walk of Fame, and L.A. Live. Hollywood Bowl, Hollywood Walk of Fame, and L.A. Live are located about 12.4 mi, 11.7 mi, and 10.9 mi, respectively from Los Angeles Los Angeles. Travelers can rent a car at Los Angeles Los Angeles for an average daily rate of $44 to make sightseeing during their layover a little easier.

  • Where are the least popular layover locations for Boston to Sydney flights?

    Flights departing from Boston and landing in Sydney layover in San Francisco least frequently.

  • 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 vacation 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 $251). Flying from Boston to Sydney in January is currently the most expensive (average of $1,100). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Coogee
Manly

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Boston to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Hartford to Sydney flights

Top 10 airlines flying from Boston to Sydney

Discover the top 10 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 2,558,603 searches. Data last updated March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$251Average$375FlexibilityNo cancel feeOn-time62%
DeltaCheapest$318Average$1,367FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$731Average$1,389FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$873Average$1,316FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$1,081Average$1,437FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,105Average$1,560FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,131Average$1,457FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$1,166Average$1,414FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,238Average$1,558FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,318Average$1,559FlexibilityNo cancel feeOn-time72%

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