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$475+ 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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
jan 3 — jan 101
sáb 1/3
sáb 1/10
1 adult, Economy
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Find cheap flights from Boston to Sydney with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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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

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 dezembro 4, 2025.

This Air Canada deal was found by Cheapflights users on 12/1. 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.
qui 12/255:30 amBOS - SYD
3 stops60h 05mAir Canada
qua 1/1411:20 amSYD - BOS
3 stops46h 30mAir Canada
Deal found 12/1$1,261
This Kiwi.com deal was found by Cheapflights users on 12/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 12/305:59 pmBOS - SYD
1 stop23h 01mQantas Airways
ter 1/132:05 pmSYD - BOS
1 stop41h 24mQantas Airways
Deal found 12/3$1,276
This United Airlines deal was found by Cheapflights users on 12/2. 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.
sáb 12/61:30 pmBOS - SYD
1 stop25h 30mUnited Airlines
seg 12/89:00 amSYD - BOS
2 stops28h 43mUnited Airlines
Deal found 12/2$1,281
This Air Canada deal was found by Cheapflights users on 12/1. 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.
qui 12/255:30 amBOS - SYD
3 stops60h 05mAir Canada
qui 1/1511:20 amSYD - BOS
2 stops44h 37mAir Canada
Deal found 12/1$1,311
This Cheapflightsfares deal was found by Cheapflights users on 12/3. 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.
qua 12/318:00 amBOS - SYD
1 stop33h 00mQantas Airways
qua 1/78:10 pmSYD - BOS
2 stops40h 43mQantas Airways
Deal found 12/3$1,326
This Booking.com deal was found by Cheapflights users on 12/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 12/55:30 amBOS - SYD
3 stops36h 05mAir Canada
sex 12/1211:20 amSYD - BOS
2 stops38h 12mAir Canada
Deal found 12/4$1,350
This Cheapflightsfares deal was found by Cheapflights users on 12/3. 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.
qua 12/106:25 pmBOS - SYD
2 stops31h 05mQantas Airways
qua 12/177:15 pmSYD - BOS
2 stops42h 18mQantas Airways
Deal found 12/3$1,356
This Air Canada deal was found by Cheapflights users on 12/1. 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.
ter 12/26:40 pmBOS - SYD
2 stops46h 55mAir Canada
sáb 12/64:00 pmSYD - BOS
2 stops43h 12mAir Canada
Deal found 12/1$1,368
This oojo deal was found by Cheapflights users on 12/1. 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.
ter 12/28:15 amBOS - SYD
1 stop32h 45mQantas Airways
sáb 12/69:55 pmSYD - BOS
2 stops35h 36mQantas Airways
Deal found 12/1$1,385

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 dezembro 4, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,246
(oojo)

One-way from

$475
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,880
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.
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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. 13% potential increase in price ($225 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($42 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 dezembro 4, 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

qua 2/4

5:20 pm-1:25 pm

2 stops28h 05m

Sydney Kingsford Smith

sex 2/27

2:05 pm-11:37 pm

1 stop25h 32m

$1,257

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sex 1/30

12:11 pm-10:25 am

2 stops30h 14m

Sydney Kingsford Smith

seg 2/23

5:45 pm-6:05 am

1 stop28h 20m

$1,257

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

qui 2/5

5:20 pm-12:30 pm

2 stops27h 10m

Sydney Kingsford Smith

ter 2/24

5:45 pm-6:05 am

1 stop28h 20m

$1,257

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sáb 1/24

5:57 pm-6:20 am

1 stop44h 23m

Sydney Kingsford Smith

sex 2/6

11:20 am-4:52 pm

1 stop21h 32m

$1,258

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sáb 2/14

5:50 pm-6:20 am

1 stop44h 30m

Sydney Kingsford Smith

sáb 2/21

11:50 am-11:30 pm

1 stop27h 40m

$1,290

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sáb 1/24

11:12 am-8:30 am

2 stops29h 18m

Sydney Kingsford Smith

sex 2/6

10:40 am-6:54 pm

2 stops24h 14m

$1,316

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

dom 2/8

5:30 pm-8:30 am

1 stop23h 00m

Sydney Kingsford Smith

qui 2/12

2:15 pm-9:23 pm

1 stop23h 08m

$1,347

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

ter 1/20

4:20 pm-7:45 pm

3 stops35h 25m

Sydney Kingsford Smith

qua 1/28

9:40 pm-3:20 pm

2 stops33h 40m

$1,400

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

qui 2/26

4:36 pm-7:45 pm

3 stops35h 09m

Sydney Kingsford Smith

ter 3/3

9:40 pm-3:36 pm

3 stops33h 56m

$1,409

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

qui 1/22

4:20 pm-7:45 pm

3 stops35h 25m

Sydney Kingsford Smith

ter 2/10

9:40 pm-3:20 pm

3 stops33h 40m

$1,413

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/2

Showing 1-10 of 21 results
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 28, 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 $1,087). 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 dezembro 4, 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.

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 dezembro 4, 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
8,010 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.9

Overall

7.9

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
8,010 reviews
Delta
7.9
Good
8,010 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.9

Overall

7.9

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
947 reviews
Delta
7.9
Good
8,010 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.9

Overall

7.9

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
9,066 reviews
Delta
7.9
Good
8,010 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.9

Overall

7.9

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
11,044 reviews
Delta
7.9
Good
8,010 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.9

Overall

7.9

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
10,500 reviews
Delta
7.9
Good
8,010 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.9

Overall

7.9

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 28h 05m. Qantas Airways provides one of the quickest options available for as low as $1,257. 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 $318, 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.

  • 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 ($558), United Airlines ($586), and Qantas Airways ($626).

  • 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 $39 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 $1,087). 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 dezembro 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$248Average$385FlexibilityNo cancel feeOn-time62%
DeltaCheapest$318Average$1,272FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$735Average$1,226FlexibilityNo cancel feeOn-time67%
Fiji AirwaysCheapest$765Average$1,418FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$824Average$1,434FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$848Average$1,432FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,099Average$1,456FlexibilityNo 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$1,556FlexibilityNo cancel feeOn-time72%

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