Sydney

$496+ 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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
Aug 19 — Aug 261
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Cheapflights Tip: The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in April or March, booked 38 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

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 August 14, 2025.

Round-trip from

$935
(Air Canada)

One-way from

$496
(CheapTickets.ch)

Popular in

December

Cheapest in

April

Average price

$1,354
From Boston Logan Intl to Sydney Kingsford Smith
One-way flight from Boston Logan Intl to Sydney Kingsford Smith
Highest demand for flights based on searches. 12% potential increase in price ($200 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($40 potential savings vs. average RT price).
Average for round-trip flights in August 2025

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 August 14, 2025.

This Air Canada deal was found by Cheapflights users on 8/12. 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.
Sun 11/210:15 amBOS - SYD
2 stops31h 20mAir Canada
Tue 11/1811:20 amSYD - BOS
2 stops38h 12mAir Canada
Deal found 8/12$935
This oojo deal was found by Cheapflights users on 8/14. 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 11/88:15 amBOS - SYD
2 stops33h 05mQantas Airways
Wed 11/192:20 pmSYD - BOS
1 stop22h 10mQantas Airways
Deal found 8/14$1,106
This oojo deal was found by Cheapflights users on 8/12. 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.
Sun 11/22:31 pmBOS - SYD
2 stops29h 04mQantas Airways
Tue 11/182:20 pmSYD - BOS
1 stop23h 15mQantas Airways
Deal found 8/12$1,109
This oojo deal was found by Cheapflights users on 8/14. 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.
Fri 11/148:37 amBOS - SYD
2 stops34h 18mQantas Airways
Mon 12/82:20 pmSYD - BOS
1 stop24h 45mQantas Airways
Deal found 8/14$1,110
This oojo deal was found by Cheapflights users on 8/14. 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.
Tue 11/1111:30 amBOS - SYD
1 stop27h 25mQantas Airways
Tue 12/22:55 pmSYD - BOS
2 stops31h 23mQantas Airways
Deal found 8/14$1,113
This oojo deal was found by Cheapflights users on 8/14. 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 11/158:15 amBOS - SYD
2 stops33h 05mQantas Airways
Mon 12/12:20 pmSYD - BOS
1 stop40h 31mQantas Airways
Deal found 8/14$1,114
This oojo deal was found by Cheapflights users on 8/14. 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.
Mon 11/243:43 pmBOS - SYD
1 stop23h 12mQantas Airways
Sun 12/79:55 pmSYD - BOS
2 stops49h 02mQantas Airways
Deal found 8/14$1,115
This Delta deal was found by Cheapflights users on 8/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/284:30 pmBOS - SYD
1 stop24h 05mDelta
Sun 10/510:25 amSYD - BOS
1 stop23h 57mDelta
Deal found 8/14$1,116
This Air Canada deal was found by Cheapflights users on 8/12. 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 11/310:15 amBOS - SYD
3 stops31h 20mAir Canada
Tue 11/1811:20 amSYD - BOS
2 stops38h 12mAir Canada
Deal found 8/12$1,117
This oojo deal was found by Cheapflights users on 8/14. 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.
Mon 12/812:22 pmBOS - SYD
1 stop26h 33mQantas Airways
Sun 12/217:05 amSYD - BOS
2 stops30h 00mQantas Airways
Deal found 8/14$1,119

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 August 14, 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

Sat 1/17

2:34 pm-6:55 am

1 stop24h 21m

Sydney Kingsford Smith

Sat 1/31

7:05 am-2:48 pm

2 stops23h 43m

$1,119

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/28

1:36 pm-6:35 am

2 stops26h 59m

Sydney Kingsford Smith

Sun 10/5

10:25 am-10:05 pm

2 stops26h 40m

$1,120

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 11/23

3:43 pm-6:55 am

1 stop23h 12m

Sydney Kingsford Smith

Sat 12/6

5:30 pm-6:57 am

2 stops29h 27m

$1,140

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 8/24

6:15 am-6:35 am

1 stop34h 20m

Sydney Kingsford Smith

Wed 8/27

9:25 am-8:08 pm

1 stop24h 43m

$1,260

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 12/30

11:15 am-8:30 am

1 stop29h 15m

Sydney Kingsford Smith

Tue 1/27

2:15 pm-10:33 pm

2 stops24h 18m

$1,270

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 12/30

6:55 am-6:50 am

2 stops31h 55m

Sydney Kingsford Smith

Mon 1/26

2:15 pm-10:41 pm

2 stops24h 26m

$1,270

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 12/31

12:25 pm-8:30 am

2 stops28h 05m

Sydney Kingsford Smith

Sun 2/1

10:40 am-10:41 pm

2 stops28h 01m

$1,270

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 12/29

8:34 am-8:30 am

2 stops31h 56m

Sydney Kingsford Smith

Mon 1/26

10:40 am-6:56 pm

2 stops24h 16m

$1,270

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 12/31

10:00 am-8:30 am

2 stops30h 30m

Sydney Kingsford Smith

Tue 1/27

10:40 am-6:56 pm

2 stops24h 16m

$1,270

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 9/4

10:53 am-7:05 am

2 stops30h 12m

$496

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 16 results
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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 August 8, 2025.

To ensure you get the cheapest price possible for a flight from Boston to Sydney, you should look to book at least 38 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, February is the cheapest month in which you can book a flight from Boston to Sydney (average of $1,031). Flying from Boston to Sydney in December is currently the most expensive (average of $1,619). 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 August 14, 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 4% 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.

What’s the top layover airport for flights from Boston to Sydney?

Share of 1-stop round-trip flights from Boston to Sydney chosen by Cheapflights users in the past 12 months, using the same layover each way.

Dallas (DFW) – chosen by Cheapflights users on 50% of 1-stop itineraries from Boston to Sydney on Cheapflights.

What’s the cheapest layover airport for flights from Boston to Sydney?

Average round-trip fare for 1-stop flights from Boston to Sydney, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Hong Kong (HKG) is the most affordable 1-stop option, with an average round-trip price of $1,418.

What’s the fastest layover option from Boston to Sydney?

Shortest average travel time for 1-stop one-way flights from Boston to Sydney, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Dallas (DFW) have the shortest average one-way travel time for 1-stop routes: 24h 40m.

Which airport typically offers the quickest layover for flights from Boston to Sydney?

Average layover duration for 1-stop one-way flights from Boston to Sydney, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Hong Kong (HKG) offer the fastest connection on this route, with an average layover time of 2h 28m.

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 August 14, 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.
8.0
Very good

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good
8.0
Very good

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.
  • 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 $454, 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?

  • 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 The Wiltern. Hollywood Bowl, Hollywood Walk of Fame, and The Wiltern are located about 12.5 mi, 11.7 mi, and 10.0 mi, respectively from Los Angeles. Travelers can rent a car at Los Angeles for an average daily rate of $52 to make sightseeing during their layover a little easier.

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

  • 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, February is the cheapest month in which you can book a flight from Boston to Sydney (average of $1,031). Flying from Boston to Sydney in December is currently the most expensive (average of $1,619). 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
Wollongong
Parramatta
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.

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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$251Average$911FlexibilityNo cancel feeOn-time62%
DeltaCheapest$454Average$1,281FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$735Average$1,228FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$824Average$1,417FlexibilityNo cancel feeOn-time69%
Fiji AirwaysCheapest$831Average$1,482FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$920Average$1,526FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,170Average$1,471FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,228Average$1,874FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,272Average$1,732FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,334Average$1,497FlexibilityNo cancel feeOn-time72%

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