HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$420+ 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in April or March, booked 14 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 June 30, 2025.

Round-trip from

$1,350
(Gurufare)

One-way from

$420
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$1,484
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. 12% potential increase in price ($201 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 30, 2025.

This Gurufare deal was found by Cheapflights users on 6/28. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/158:00 amBOS - SYD
1 stop32h 30mQantas Airways
Wed 10/2911:15 amSYD - BOS
1 stop23h 37mQantas Airways
Deal found 6/28$1,350
This United Airlines deal was found by Cheapflights users on 6/29. 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.
Thu 8/288:25 amBOS - SYD
2 stops32h 35mUnited Airlines
Tue 9/29:30 amSYD - BOS
2 stops39h 05mUnited Airlines
Deal found 6/29$1,351
This FlightHub deal was found by Cheapflights users on 6/28. 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 10/183:15 pmBOS - SYD
2 stops26h 05mAir Canada
Fri 10/3110:20 amSYD - BOS
2 stops26h 07mAir Canada
Deal found 6/28$1,360
This FlightHub deal was found by Cheapflights users on 6/29. 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 10/69:35 pmBOS - SYD
2 stops31h 25mTurkish Airlines
Thu 10/99:55 pmSYD - BOS
2 stops36h 45mTurkish Airlines
Deal found 6/29$1,371
This oojo deal was found by Cheapflights users on 6/29. 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 8/296:07 pmBOS - SYD
2 stops35h 13mMultiple Airlines
Tue 9/29:00 amSYD - BOS
2 stops28h 16mMultiple Airlines
Deal found 6/29$1,372
This KAYAK deal was found by Cheapflights users on 6/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/249:30 amBOS - SYD
2 stops33h 55mANA
Mon 11/39:45 pmSYD - BOS
2 stops32h 23mANA
Deal found 6/30$1,376
This oojo deal was found by Cheapflights users on 6/29. 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 11/99:15 pmBOS - SYD
1 stop41h 35mQatar Airways
Mon 11/173:50 pmSYD - BOS
1 stop38h 05mQatar Airways
Deal found 6/29$1,377
This Delta deal was found by Cheapflights users on 6/30. 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.
Fri 8/226:15 amBOS - SYD
1 stop34h 20mDelta
Mon 9/19:25 amSYD - BOS
1 stop23h 59mDelta
Deal found 6/30$1,381
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/27:20 amBOS - SYD
2 stops32h 45mAlaska Airlines
Thu 10/305:45 pmSYD - BOS
2 stops28h 44mAlaska Airlines
Deal found 6/30$1,399
This American Airlines deal was found by Cheapflights users on 6/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2812:15 pmBOS - SYD
1 stop27h 10mAmerican Airlines
Sun 12/142:20 pmSYD - BOS
1 stop24h 45mAmerican Airlines
Deal found 6/29$1,436
This oojo deal was found by Cheapflights users on 6/28. 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 8/227:30 amBOS - SYD
2 stops35h 15mAir New Zealand
Mon 9/16:20 pmSYD - BOS
2 stops49h 40mAir New Zealand
Deal found 6/28$1,442

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 June 30, 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

Wed 10/15

8:00 am-7:30 am

1 stop32h 30m

Sydney Kingsford Smith

Wed 10/29

11:15 am-7:52 pm

1 stop23h 37m

$1,350

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 8/28

6:20 pm-7:00 am

1 stop22h 40m

Sydney Kingsford Smith

Tue 9/2

9:30 am-10:35 am

2 stops39h 05m

$1,351

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 10/18

3:15 pm-8:20 am

2 stops26h 05m

Sydney Kingsford Smith

Fri 10/31

10:20 am-9:27 pm

2 stops26h 07m

$1,360

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 10/6

9:35 pm-8:00 pm

2 stops31h 25m

Sydney Kingsford Smith

Thu 10/9

9:55 pm-7:40 pm

2 stops36h 45m

$1,371

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 8/29

6:07 pm-7:20 pm

2 stops35h 13m

Sydney Kingsford Smith

Tue 9/2

9:00 am-11:16 pm

2 stops28h 16m

$1,372

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 10/24

9:30 am-10:25 am

2 stops33h 55m

Sydney Kingsford Smith

Mon 11/3

9:45 pm-2:08 pm

2 stops32h 23m

$1,376

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 11/9

9:15 pm-6:50 pm

1 stop29h 35m

Sydney Kingsford Smith

Mon 11/17

3:50 pm-1:55 pm

1 stop38h 05m

$1,377

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 8/22

6:15 am-6:35 am

1 stop34h 20m

Sydney Kingsford Smith

Mon 9/1

9:25 am-7:24 pm

1 stop23h 59m

$1,381

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 10/2

7:20 am-6:05 am

2 stops32h 45m

Sydney Kingsford Smith

Thu 10/30

5:45 pm-7:29 am

2 stops28h 44m

$1,399

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 11/28

12:15 pm-7:25 am

1 stop27h 10m

Sydney Kingsford Smith

Sun 12/14

2:20 pm-11:05 pm

1 stop24h 45m

$1,436

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/28

Showing 1-10 of 19 results
1
2

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 June 27, 2025.

To ensure you get the cheapest price possible for a flight from Boston to Sydney, you should look to book at least 14 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 $1,039). Flying from Boston to Sydney in December is currently the most expensive (average of $1,636). 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 June 30, 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.

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 June 30, 2025.
See what other customers who have flown with ANA, Alaska Airlines, and Delta 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.
ANA
8.4
Very good
889 reviews

Overall

8.4

Food

7.7

Boarding

8.5

Entertainment

7.9

Crew

8.7

Comfort

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
ANA
8.4
Very good
889 reviews
ANA
8.4
Very good
889 reviews

Overall

8.4

Food

7.7

Boarding

8.5

Entertainment

7.9

Crew

8.7

Comfort

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Alaska Airlines
8.0
Very good
10,000 reviews
ANA
8.4
Very good
889 reviews

Overall

8.4

Food

7.7

Boarding

8.5

Entertainment

7.9

Crew

8.7

Comfort

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Delta
8.0
Very good
7,973 reviews
ANA
8.4
Very good
889 reviews

Overall

8.4

Food

7.7

Boarding

8.5

Entertainment

7.9

Crew

8.7

Comfort

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Air New Zealand
8.0
Very good
486 reviews
ANA
8.4
Very good
889 reviews

Overall

8.4

Food

7.7

Boarding

8.5

Entertainment

7.9

Crew

8.7

Comfort

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Qantas Airways
7.5
Good
867 reviews
ANA
8.4
Very good
889 reviews

Overall

8.4

Food

7.7

Boarding

8.5

Entertainment

7.9

Crew

8.7

Comfort

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.

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 $1,350. Other airlines that can offer you cheap pricing are United Airlines, from $1,351, and Air Canada, from $1,360. You may be able to fly from Boston to Sydney for 5% 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 Alaska Airlines ($567), Qantas Airways ($593), and Air Canada ($610).

  • 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. San Francisco 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 12.5 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 $41 to make sightseeing during their layover a little easier.

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

    If you're on a layover in San Francisco and looking for things to do, consider visiting Fisherman's Wharf, Union Square, or Bill Graham Civic Auditorium. Those on a layover in San Francisco interested in visiting Fisherman's Wharf, Union Square, or Bill Graham Civic Auditorium can do so by traveling 13.0 mi, 11.6 mi, and 11.1 mi, respectively from San Francisco. Travelers can rent a car at San Francisco 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 Vancouver 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 $1,039). Flying from Boston to Sydney in December is currently the most expensive (average of $1,636). 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 Boston?

Book flights to Boston if you plan to visit one of these locations
Wollongong
Parramatta
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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$251Average$911FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$735Average$1,221FlexibilityNo cancel feeOn-time67%
DeltaCheapest$768Average$1,286FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$824Average$1,407FlexibilityNo cancel feeOn-time69%
Fiji AirwaysCheapest$831Average$1,482FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$933Average$1,521FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,194Average$1,461FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,228Average$1,874FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,295Average$1,733FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$1,334Average$1,495FlexibilityNo cancel feeOn-time72%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.