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$629+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
May 18 — May 251
Mon 5/18
Mon 5/25
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 April 18, 2026.

This FlightHub deal was found by Cheapflights users on 4/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:30 am
BOS
-
SYD
1 stop30h 35m
Qantas Airways
Fri 10/307:05 am
SYD
-
BOS
2 stops27h 37m
Qantas Airways
Deal found 4/13$1,288
This oojo deal was found by Cheapflights users on 4/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1710:30 am
BOS
-
SYD
1 stop30h 35m
Qantas Airways
Sat 10/315:50 pm
SYD
-
BOS
2 stops39h 26m
Qantas Airways
Deal found 4/14$1,292
This Air Canada deal was found by Cheapflights users on 4/14. 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 10/2110:40 am
BOS
-
SYD
2 stops30h 40m
Air Canada
Wed 10/2810:20 am
SYD
-
BOS
2 stops38h 17m
Air Canada
Deal found 4/14$1,310
This Air Canada deal was found by Cheapflights users on 4/13. 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
Sun 10/1810:20 am
SYD
-
BOS
3 stops38h 30m
Air Canada
Deal found 4/13$1,319
This FlightHub deal was found by Cheapflights users on 4/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2210:20 am
BOS
-
SYD
2 stops31h 15m
Air Canada
Sun 11/2911:20 am
SYD
-
BOS
2 stops24h 57m
Air Canada
Deal found 4/13$1,320
This Air Canada deal was found by Cheapflights users on 4/13. 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 9/162:03 pm
BOS
-
SYD
2 stops27h 17m
Multiple Airlines
Wed 9/309:20 am
SYD
-
BOS
3 stops38h 30m
Multiple Airlines
Deal found 4/13$1,330
This FlightHub deal was found by Cheapflights users on 4/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/223:20 pm
BOS
-
SYD
2 stops26h 15m
Air Canada
Sat 11/2811:20 am
SYD
-
BOS
2 stops37h 25m
Air Canada
Deal found 4/13$1,341
This FlightHub deal was found by Cheapflights users on 4/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/217:25 pm
BOS
-
SYD
2 stops46h 10m
Air Canada
Sat 11/2811:20 am
SYD
-
BOS
2 stops37h 25m
Air Canada
Deal found 4/13$1,346
This FlightHub deal was found by Cheapflights users on 4/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/209:35 am
BOS
-
SYD
2 stops32h 00m
Air Canada
Sun 11/2911:20 am
SYD
-
BOS
2 stops24h 57m
Air Canada
Deal found 4/13$1,350
This BusinessClass deal was found by Cheapflights users on 4/13. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/910:50 am
BOS
-
SYD
1 stop30h 30m
Multiple Airlines
Wed 9/239:20 am
SYD
-
BOS
2 stops46h 22m
Multiple Airlines
Deal found 4/13$1,352

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 April 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,310
(Air Canada)

One-way from

$629
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,523
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. 10% potential increase in price ($181 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 18, 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
Quickest round-trip

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 6/14

6:10 pm-6:55 am

1 stop22h 45m

Sydney Kingsford Smith

Sun 6/21

10:20 am-1:11 am

1 stop28h 51m

$1,418

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 6/1

2:40 pm-7:00 am

2 stops26h 20m

Sydney Kingsford Smith

Mon 6/8

10:20 am-9:59 pm

2 stops25h 39m

$1,422

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 5/11

12:05 pm-6:50 am

2 stops28h 45m

Sydney Kingsford Smith

Fri 5/22

9:15 am-9:07 pm

2 stops25h 52m

$1,434

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 5/2

9:25 am-6:50 am

2 stops31h 25m

Sydney Kingsford Smith

Sun 5/17

9:15 am-12:40 am

2 stops29h 25m

$1,434

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 5/16

11:00 am-6:50 am

1 stop29h 50m

Sydney Kingsford Smith

Sat 5/23

9:15 am-11:56 pm

1 stop28h 41m

$1,440

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 5/22

4:30 pm-6:50 am

1 stop24h 20m

Sydney Kingsford Smith

Fri 6/5

9:15 am-11:58 pm

2 stops28h 43m

$1,446

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 5/17

5:45 am-7:00 am

2 stops35h 15m

Sydney Kingsford Smith

Wed 5/27

10:20 am-5:04 pm

1 stop20h 44m

$1,560

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 5/4

8:05 am-7:00 am

2 stops32h 55m

Sydney Kingsford Smith

Mon 5/11

9:30 am-4:55 pm

1 stop21h 25m

$1,560

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 6/1

5:45 am-7:00 am

2 stops35h 15m

Sydney Kingsford Smith

Mon 6/15

9:30 am-5:20 pm

1 stop21h 50m

$1,560

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 5/4

10:55 am-6:50 am

1 stop29h 55m

Sydney Kingsford Smith

Thu 6/4

9:15 am-7:20 pm

1 stop24h 05m

$1,610

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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 April.
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
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice 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 April 10, 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 $1,215). Flying from Boston to Sydney in December is currently the most expensive (average of $1,997). 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 April 18, 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
8,424 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
8,424 reviews
Delta
7.9
Good
8,424 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
1,019 reviews
Delta
7.9
Good
8,424 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
9,603 reviews
Delta
7.9
Good
8,424 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
11,607 reviews
Delta
7.9
Good
8,424 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
10,935 reviews
Delta
7.9
Good
8,424 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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 22h 45m. United Airlines provides one of the quickest options available for as low as $1,418. 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 $317, and Fiji Airways, from $727. 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. Dallas follows Los Angeles in terms of the most common layover location on Boston to Sydney flights.

  • 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. Travelers can rent a car at Los Angeles for an average daily rate of $45 to make sightseeing during their layover a little easier.

  • What are some popular points of interest to see during a layover in Dallas?

    If you're on a layover in Dallas and looking for things to do, consider visiting American Airlines Center, Dallas World Aquarium, or Reunion Tower. Those on a layover in Dallas interested in visiting American Airlines Center, Dallas World Aquarium, or Reunion Tower can do so by traveling 15.0 mi, 15.5 mi, and 15.6 mi, respectively from Dallas/Fort Worth. Travelers can rent a car at Dallas/Fort Worth for an average daily rate of $56 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 $1,215). Flying from Boston to Sydney in December is currently the most expensive (average of $1,997). 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 April 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$251Average$277FlexibilityNo cancel feeOn-time62%
DeltaCheapest$317Average$1,448FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$727Average$1,059FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$907Average$1,316FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$1,077Average$1,435FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,145Average$1,572FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,147Average$1,453FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$1,166Average$1,414FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,233Average$1,558FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,318Average$1,907FlexibilityNo cancel feeOn-time72%

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