Find flights
When to book
Airlines
FAQs

Cheap flights from Boston to Sydney from $873

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
28 Aug — 4 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Boston to Sydney

Enter your travel dates to find the best prices.

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 29 July 2026.

Wed 29/710:30
BOS
-
SYD
1 stop31h 00m
American Airlines
Wed 5/812:00
SYD
-
BOS
1 stop21h 42m
American Airlines
Deal found 26/7$1,704
Sun 23/810:30
BOS
-
SYD
1 stop30h 35m
Qantas Airways
Sun 30/809:10
SYD
-
BOS
1 stop28h 34m
Qantas Airways
Deal found 27/7$1,705
Tue 8/910:40
BOS
-
SYD
3 stops30h 40m
Air Canada
Wed 23/909:20
SYD
-
BOS
2 stops26h 06m
Air Canada
Deal found 27/7$1,707
Mon 10/818:10
BOS
-
SYD
1 stop22h 45m
United Airlines
Tue 25/810:20
SYD
-
BOS
1 stop24h 42m
United Airlines
Deal found 26/7$1,708
Tue 22/916:35
BOS
-
SYD
1 stop24h 30m
Qantas Airways
Tue 29/917:50
SYD
-
BOS
1 stop28h 23m
Qantas Airways
Deal found 24/7$1,712
Sun 9/815:54
BOS
-
SYD
2 stops25h 06m
United Airlines
Wed 19/809:30
SYD
-
BOS
2 stops23h 58m
United Airlines
Deal found 26/7$1,714
Sat 8/820:27
BOS
-
SYD
1 stop44h 28m
United Airlines
Sun 30/809:30
SYD
-
BOS
1 stop21h 50m
United Airlines
Deal found 28/7$1,724
Sat 15/817:01
BOS
-
SYD
2 stops47h 54m
United Airlines
Sun 30/809:30
SYD
-
BOS
2 stops26h 29m
United Airlines
Deal found 29/7$1,732
Wed 18/1110:35
BOS
-
SYD
2 stops31h 00m
Air Canada
Sat 28/1111:20
SYD
-
BOS
2 stops38h 38m
Air Canada
Deal found 25/7$1,734

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 29 July 2026.

Round-trip from

$1,704

One-way from

$873

Popular in

December

Cheapest in

September

Average price

$2,141
American Airlines
  • American Airlines
  • 16/8-23/8
  • 2 total stops
  • 58h 46m total
  • Boston to Sydney
Search Deals
Qantas Airways
  • Qantas Airways
  • 23/8
  • 1 total stop
  • 30h 35m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($472 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($115 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 29 July 2026.
Use the filters below to find and compare flights from Boston to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 8/8

20:27-06:55

1 stop44h 28m

Sydney Kingsford Smith

Sun 30/8

09:30-21:59

2 stops26h 29m

$1,724

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

17:01-06:55

2 stops47h 54m

Sydney Kingsford Smith

Sun 30/8

10:20-23:59

2 stops27h 39m

$1,732

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

17:01-06:55

2 stops47h 54m

Sydney Kingsford Smith

Sat 29/8

10:20-23:59

2 stops27h 39m

$1,804

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 17/11

08:25-09:05

1 stop32h 40m

Sydney Kingsford Smith

Tue 22/12

11:20-16:47

1 stop21h 27m

$1,836

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 20/8

09:20-06:55

1 stop31h 35m

Sydney Kingsford Smith

Thu 27/8

09:30-21:02

2 stops25h 32m

$1,852
Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 3/10

14:45-08:00

1 stop26h 15m

Sydney Kingsford Smith

Mon 12/10

10:30-21:49

2 stops26h 19m

$1,953

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 18/9

11:40-07:00

1 stop29h 20m

Sydney Kingsford Smith

Sun 11/10

10:30-20:57

2 stops25h 27m

$1,953

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 11/9

07:45-06:55

1 stop33h 10m

Sydney Kingsford Smith

Sun 27/9

09:30-21:49

2 stops26h 19m

$1,953

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 8/8

17:35-07:00

2 stops47h 25m

Sydney Kingsford Smith

Sat 12/12

11:20-21:33

2 stops26h 13m

$2,190

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 6/12

20:40-22:20

2 stops33h 40m

Sydney Kingsford Smith

Sat 12/12

22:10-14:30

1 stop32h 20m

$2,331

Flights are sorted by cheapest return flights first.

Deals found on 28/7

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 return 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?

The best time to book flights from Boston to Sydney is 15 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 $1,767). Flying from Boston to Sydney in December is currently the most expensive (average of $2,992). 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.

How much does it cost for a return flight from Boston to Sydney?

Airfare is below average for this route at the moment.

Boston to Sydney flights typically cost between $1,820 and $2,348 in August.
The cheapest return price found within the last 5 days was $1,704 on American Airlines (16 Aug–23 Aug).

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 29 July 2026.
Check out reviews from past customers who have flown with Qantas Airways and United Airlines from Boston to Sydney to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
1,073 reviews
Check prices

Comfort

7.4

Crew

8.1

Overall

7.5

Boarding

7.7

Entertainment

7.2

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
Qantas Airways
7.5
Good
1,073 reviews
Qantas Airways
7.5
Good
1,073 reviews
Check prices

Comfort

7.4

Crew

8.1

Overall

7.5

Boarding

7.7

Entertainment

7.2

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
United Airlines
7.4
Good
10,046 reviews
Qantas Airways
7.5
Good
1,073 reviews
Check prices

Comfort

7.4

Crew

8.1

Overall

7.5

Boarding

7.7

Entertainment

7.2

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.

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?

    For as low as $1,724, United Airlines can have you in Sydney from Boston in 44h 28m. Airlines will cover a distance of 16240 km.

  • What are the cheapest airlines flying from Boston to Sydney round-trip?

    Flying on Qantas Airways is currently your cheapest option to Sydney, with prices starting at $1,413. Another option worth looking into is United Airlines, starting at $1,676 round trip. Qantas Airways is 33% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 holiday 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 $1,767). Flying from Boston to Sydney in December is currently the most expensive (average of $2,992). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Katoomba
Manly
Lithgow
Cronulla
Randwick
Terrigal
Leura
Bondi Beach
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.

Top 2 airlines flying from Boston to Sydney

Discover the top 2 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 647,157 searches. Data last updated 29 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,413Average$2,158FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
United AirlinesCheapest$1,676Average$2,024FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Boston to Sydney?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Boston to Sydney. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Boston to Sydney?

Cheapflights helps you find that perfect flight to Sydney from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Boston to Sydney with no change fees?

Certainly. Search results for flights to Sydney from Boston shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Boston to Sydney become cheaper?

Of course! You can now track prices for flights from Boston to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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.