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$534+ 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in September 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 September 16, 2025.

Round-trip from

$1,097
(FlightHub)

One-way from

$534
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$1,242
From Boston Logan Intl to Sydney Kingsford Smith
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One-way flight from Boston Logan Intl to Sydney Kingsford Smith
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Highest demand for flights based on searches. 13% potential increase in price ($223 potential increase over avg. RT price).
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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 September 2025
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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 September 16, 2025.

This lol.travel deal was found by Cheapflights users on 9/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/223:30 pmBOS - SYD
2 stops25h 25mUnited Airlines
Sun 10/511:20 amSYD - BOS
1 stop24h 12mUnited Airlines
Deal found 9/15$1,046
This FlightHub deal was found by Cheapflights users on 9/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/154:35 pmBOS - SYD
1 stop24h 20mQantas Airways
Mon 9/2212:10 pmSYD - BOS
1 stop25h 32mQantas Airways
Deal found 9/14$1,081
This FlightHub deal was found by Cheapflights users on 9/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1912:00 pmBOS - SYD
2 stops29h 20mQantas Airways
Fri 11/282:05 pmSYD - BOS
1 stop23h 31mQantas Airways
Deal found 9/14$1,097
This FlightHub deal was found by Cheapflights users on 9/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1412:00 pmBOS - SYD
2 stops31h 35mQantas Airways
Sat 1/312:05 pmSYD - BOS
1 stop23h 05mQantas Airways
Deal found 9/14$1,101
This oojo deal was found by Cheapflights users on 9/14. 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.
Wed 11/58:15 amBOS - SYD
2 stops33h 05mQantas Airways
Fri 1/162:05 pmSYD - BOS
1 stop23h 05mQantas Airways
Deal found 9/14$1,102
This oojo deal was found by Cheapflights users on 9/14. 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 11/1512:00 pmBOS - SYD
2 stops29h 50mQantas Airways
Wed 12/102:05 pmSYD - BOS
1 stop23h 28mQantas Airways
Deal found 9/14$1,104
This oojo deal was found by Cheapflights users on 9/14. 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.
Thu 11/133:43 pmBOS - SYD
2 stops36h 22mQantas Airways
Fri 1/162:05 pmSYD - BOS
1 stop20h 55mQantas Airways
Deal found 9/14$1,106
This oojo deal was found by Cheapflights users on 9/14. 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.
Sun 11/23:43 pmBOS - SYD
2 stops27h 52mQantas Airways
Sun 11/92:05 pmSYD - BOS
1 stop24h 57mQantas Airways
Deal found 9/14$1,108
This oojo deal was found by Cheapflights users on 9/14. 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 12/23:35 pmSYD - BOS
2 stops30h 43mQantas Airways
Deal found 9/14$1,111
This oojo deal was found by Cheapflights users on 9/14. 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 11/14:34 pmBOS - SYD
2 stops35h 51mQantas Airways
Sun 11/162:05 pmSYD - BOS
1 stop40h 49mQantas Airways
Deal found 9/14$1,117

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 September 16, 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

Fri 11/14

12:00 pm-9:00 am

1 stop29h 00m

Sydney Kingsford Smith

Mon 12/8

7:15 pm-5:35 pm

2 stops38h 20m

$1,166

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 2/7

4:23 pm-12:30 pm

2 stops28h 07m

Sydney Kingsford Smith

Tue 3/10

6:00 am-11:05 pm

2 stops32h 05m

$1,260

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/19

5:55 pm-7:45 pm

2 stops33h 50m

Sydney Kingsford Smith

Sun 2/1

9:40 pm-3:47 pm

1 stop34h 07m

$1,276

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 10/31

4:46 pm-7:45 pm

3 stops35h 59m

Sydney Kingsford Smith

Fri 11/7

9:40 pm-5:23 pm

2 stops35h 43m

$1,325

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/8

8:15 am-9:50 am

2 stops33h 35m

Sydney Kingsford Smith

Tue 3/10

1:00 pm-6:56 am

2 stops32h 56m

$1,341

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 2/10

1:50 pm-8:45 am

2 stops26h 55m

Sydney Kingsford Smith

Tue 2/17

11:45 am-12:01 am

3 stops28h 16m

$1,414

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/8

10:56 am-6:20 am

1 stop27h 24m

Sydney Kingsford Smith

Tue 3/10

12:10 pm-7:28 pm

1 stop22h 18m

$1,453

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 3/8

7:40 am-7:00 am

1 stop32h 20m

Sydney Kingsford Smith

Sat 3/28

11:50 am-7:09 pm

1 stop22h 19m

$1,453

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 10/29

7:00 am-7:00 am

1 stop33h 00m

Sydney Kingsford Smith

Wed 11/5

12:10 pm-5:06 pm

1 stop20h 56m

$1,453

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 2/11

6:17 pm-9:05 am

1 stop22h 48m

Sydney Kingsford Smith

Tue 3/10

10:20 am-4:38 pm

1 stop21h 18m

$1,453

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 21 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 September 12, 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, March is the cheapest month in which you can book a flight from Boston to Sydney (average of $1,032). Flying from Boston to Sydney in December is currently the most expensive (average of $1,627). 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 September 16, 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.

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 September 16, 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
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
Delta
8.0
Very good
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
Qantas Airways
7.5
Good
907 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
United Airlines
7.4
Good
8,924 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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.

  • How long is the flight from Boston to Sydney?

    A quick flight from Boston to Sydney can take about 28h 07m. Qantas Airways provides one of the quickest options available for as low as $1,260. 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 $430, 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 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 $41 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, March is the cheapest month in which you can book a flight from Boston to Sydney (average of $1,032). Flying from Boston to Sydney in December is currently the most expensive (average of $1,627). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$251Average$911FlexibilityNo cancel feeOn-time62%
DeltaCheapest$430Average$1,272FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$735Average$1,228FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$824Average$1,405FlexibilityNo cancel feeOn-time69%
Fiji AirwaysCheapest$831Average$1,429FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$920Average$1,502FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,117Average$1,484FlexibilityNo 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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