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$505+ 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
dic. 20 — dic. 271
sáb. 12/20
sáb. 12/27
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in March or September, booked 73 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Find 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 noviembre 20, 2025.

This Gotogate deal was found by Cheapflights users on 11/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/305:30 amBOS - SYD
3 stops36h 05mAir Canada
dom. 12/1411:20 amSYD - BOS
3 stops38h 12mAir Canada
Deal found 11/19$1,258
This oojo deal was found by Cheapflights users on 11/18. 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.
mié. 11/198:15 amBOS - SYD
2 stops33h 05mQantas Airways
mié. 11/262:05 pmSYD - BOS
1 stop22h 25mQantas Airways
Deal found 11/18$1,261
This Cheapflightsfares deal was found by Cheapflights users on 11/20. 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.
mié. 12/106:25 pmBOS - SYD
2 stops31h 05mQantas Airways
jue. 12/187:15 pmSYD - BOS
2 stops38h 05mQantas Airways
Deal found 11/20$1,266
This Air Canada deal was found by Cheapflights users on 11/20. 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.
mié. 12/3110:15 amBOS - SYD
3 stops31h 20mAir Canada
lun. 5/189:20 amSYD - BOS
3 stops38h 30mAir Canada
Deal found 11/20$1,302
This Air Canada deal was found by Cheapflights users on 11/20. 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.
lun. 12/17:55 pmBOS - SYD
2 stops45h 40mAir Canada
lun. 12/2211:20 amSYD - BOS
2 stops27h 17mAir Canada
Deal found 11/20$1,305
This Air Canada deal was found by Cheapflights users on 11/18. 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.
dom. 11/2310:45 amBOS - SYD
2 stops30h 50mAir Canada
sáb. 12/611:20 amSYD - BOS
2 stops26h 07mAir Canada
Deal found 11/18$1,322
This Air Canada deal was found by Cheapflights users on 11/19. 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.
vie. 11/286:40 pmBOS - SYD
2 stops44h 15mAir Canada
mar. 12/911:20 amSYD - BOS
2 stops38h 12mAir Canada
Deal found 11/19$1,325
This Air Canada deal was found by Cheapflights users on 11/19. 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.
mar. 12/210:15 amBOS - SYD
2 stops28h 40mAir Canada
mar. 12/911:20 amSYD - BOS
2 stops44h 37mAir Canada
Deal found 11/19$1,351
This Air Canada deal was found by Cheapflights users on 11/19. 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.
vie. 12/266:55 pmBOS - SYD
2 stops44h 00mAir Canada
jue. 1/154:00 pmSYD - BOS
2 stops33h 32mAir Canada
Deal found 11/19$1,381

Cheap 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 noviembre 20, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,258
(Gotogate)

One-way from

$505
(Air Canada)

Popular in

December

Cheapest in

March

Average price

$1,452
Provider with most accurate pricing for Boston Logan Intl-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Boston Logan Intl-Sydney Kingsford Smith flights.
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From Boston Logan Intl to Sydney Kingsford Smith
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One-way flight from Boston Logan Intl to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($228 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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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 noviembre 20, 2025.
Use the filters below to find and compare flights from Boston to Sydney that are best for you.

Fly from

Boston

Fly to

Sydney

Route

Depart

Return

Price

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sáb. 2/14

5:35 pm-8:30 am

1 stop22h 55m

Sydney Kingsford Smith

sáb. 2/21

10:40 am-10:32 pm

2 stops27h 52m

$1,338

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mié. 2/18

12:45 pm-8:30 am

1 stop27h 45m

Sydney Kingsford Smith

jue. 2/26

10:40 am-9:23 pm

1 stop26h 43m

$1,347

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mar. 1/20

5:30 pm-8:30 am

1 stop23h 00m

Sydney Kingsford Smith

mar. 1/27

10:40 am-4:17 pm

1 stop21h 37m

$1,347

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

vie. 12/12

4:01 pm-7:25 pm

2 stops35h 24m

Sydney Kingsford Smith

mié. 1/14

10:05 am-11:30 pm

2 stops29h 25m

$1,478

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

jue. 1/8

4:20 pm-7:45 pm

3 stops35h 25m

Sydney Kingsford Smith

dom. 1/25

9:40 pm-3:20 pm

3 stops33h 40m

$1,516

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

jue. 11/27

7:00 am-7:00 am

1 stop32h 00m

Sydney Kingsford Smith

jue. 12/11

9:00 am-5:06 pm

2 stops24h 06m

$1,581

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mar. 1/6

10:56 am-11:40 am

2 stops32h 44m

Sydney Kingsford Smith

jue. 1/15

11:20 am-6:32 pm

2 stops23h 12m

$1,586

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

jue. 1/15

4:20 pm-7:45 pm

3 stops35h 25m

Sydney Kingsford Smith

jue. 2/12

9:40 pm-5:24 pm

2 stops35h 44m

$1,586

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

jue. 1/8

4:20 pm-7:45 pm

3 stops35h 25m

Sydney Kingsford Smith

jue. 3/12

9:40 pm-3:36 pm

3 stops32h 56m

$1,590

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sáb. 1/10

6:44 pm-7:45 pm

2 stops33h 01m

Sydney Kingsford Smith

sáb. 1/17

9:40 pm-3:20 pm

2 stops33h 40m

$1,607

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 20 results
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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Boston-Sydney flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 November 14, 2025.

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 $252). Flying from Boston to Sydney in December is currently the most expensive (average of $1,172). 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.

What is the cheapest time of day to fly from BOS to SYD?

Find hourly flight availability from Boston to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated noviembre 20, 2025.

One of the essential ways to save on airfare from Boston to Sydney is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 3% on airfare.

What is the cheapest day to fly from Boston to Sydney?

Use this chart to determine the cheapest time to fly round-trip from Boston to Sydney. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Boston to Sydney flight should consider departing on Wednesday at noon when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 noviembre 20, 2025.
See what other customers who have flown with Delta, Qantas Airways, and United 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
8,002 reviews

Overall

7.9

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.3

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
8,002 reviews
Delta
7.9
Good
8,002 reviews

Overall

7.9

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.3

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
942 reviews
Delta
7.9
Good
8,002 reviews

Overall

7.9

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.3

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
9,028 reviews
Delta
7.9
Good
8,002 reviews

Overall

7.9

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.3

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
7.2
Good
11,045 reviews
Delta
7.9
Good
8,002 reviews

Overall

7.9

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.3

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
10,462 reviews
Delta
7.9
Good
8,002 reviews

Overall

7.9

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.3

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 55m. Delta provides one of the quickest options available for as low as $1,338. 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 $248. Other airlines that can offer you cheap pricing are Delta, from $400, and Air Canada, from $735. You may be able to fly from Boston to Sydney for 82% less than the average price by searching for these airlines.

  • 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 12.5 mi, 11.7 mi, and 10.8 mi, respectively from Los Angeles. Travelers can rent a car at Los Angeles for an average daily rate of $42 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 $252). Flying from Boston to Sydney in December is currently the most expensive (average of $1,172). 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
Manly
Coogee

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 noviembre 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$248Average$1,437FlexibilityNo cancel feeOn-time62%
DeltaCheapest$400Average$1,267FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$735Average$1,221FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$824Average$1,424FlexibilityNo cancel feeOn-time69%
Fiji AirwaysCheapest$831Average$1,482FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$916Average$1,445FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,109Average$1,468FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,228Average$1,874FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,272Average$1,696FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,318Average$1,497FlexibilityNo cancel feeOn-time72%

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