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Cheap flights from Boston to Sydney from $675

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
28 Feb — 7 Mar1
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 January 2026.

Sat 28/216:50
BOS
-
SYD
2 stops46h 45m
Qantas Airways
Sat 7/311:20
SYD
-
BOS
1 stop23h 20m
Qantas Airways
Deal found 26/1$1,376
Sat 28/216:50
BOS
-
SYD
2 stops46h 45m
Qantas Airways
Sat 14/311:20
SYD
-
BOS
1 stop23h 11m
Qantas Airways
Deal found 27/1$1,379
Sun 1/217:20
BOS
-
SYD
1 stop23h 40m
Qantas Airways
Sat 7/217:50
SYD
-
BOS
2 stops39h 30m
Qantas Airways
Deal found 27/1$1,394
Sun 1/307:15
BOS
-
SYD
2 stops56h 20m
Qantas Airways
Sat 7/311:20
SYD
-
BOS
1 stop26h 55m
Qantas Airways
Deal found 26/1$1,395
Tue 23/610:55
BOS
-
SYD
2 stops32h 30m
ANA
Thu 9/711:50
SYD
-
BOS
2 stops43h 38m
ANA
Deal found 26/1$1,443
Tue 17/314:36
BOS
-
SYD
2 stops39h 14m
Qantas Airways
Sun 31/509:10
SYD
-
BOS
1 stop25h 46m
Qantas Airways
Deal found 26/1$1,469
Thu 26/216:50
BOS
-
SYD
1 stop24h 10m
Qantas Airways
Tue 3/319:15
SYD
-
BOS
2 stops39h 25m
Qantas Airways
Deal found 27/1$1,473
Mon 22/612:52
BOS
-
SYD
2 stops40h 23m
ANA
Thu 9/720:55
SYD
-
BOS
2 stops40h 13m
ANA
Deal found 26/1$1,529
Sun 19/406:00
BOS
-
SYD
2 stops37h 25m
ANA
Thu 30/420:55
SYD
-
BOS
2 stops39h 04m
ANA
Deal found 26/1$1,582
Fri 3/417:30
BOS
-
SYD
1 stop23h 35m
Qantas Airways
Sun 12/417:50
SYD
-
BOS
1 stop28h 14m
Qantas Airways
Deal found 29/1$1,592
Sat 28/210:15
BOS
-
SYD
2 stops31h 20m
Air Canada
Sat 7/311:20
SYD
-
BOS
2 stops37h 12m
Air Canada
Deal found 26/1$1,599
Thu 25/610:40
BOS
-
SYD
2 stops30h 40m
Air Canada
Thu 9/709:20
SYD
-
BOS
2 stops26h 07m
Air Canada
Deal found 29/1$1,602

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 January 2026.

Round-trip from

$1,376

One-way from

$675

Popular in

December

Cheapest in

September

Average price

$2,112
Qantas Airways
  • Qantas Airways
  • 28/2-7/3
  • 3 total stops
  • 70h 05m total
  • Boston to Sydney
Search Deals
10/3
  • 10/3
  • 2 total stops
  • 40h 20m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($417 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($99 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 January 2026.
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 1/4

21:50-20:10

2 stops31h 20m

Sydney Kingsford Smith

Wed 8/4

21:05-19:55

2 stops36h 50m

$1,705

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 15/4

15:05-07:05

2 stops26h 00m

Sydney Kingsford Smith

Sun 26/4

09:10-19:09

2 stops23h 59m

$1,718

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 14/4

05:45-07:00

2 stops35h 15m

Sydney Kingsford Smith

Wed 13/5

10:20-17:14

1 stop20h 54m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 13/4

17:20-06:50

1 stop23h 30m

Sydney Kingsford Smith

Sun 17/5

09:15-23:58

1 stop28h 43m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 14/4

15:28-06:55

2 stops25h 27m

Sydney Kingsford Smith

Mon 18/5

10:20-17:14

1 stop20h 54m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 14/4

17:20-06:50

1 stop23h 30m

Sydney Kingsford Smith

Wed 13/5

09:15-23:58

1 stop28h 43m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 12/4

05:45-07:00

2 stops35h 15m

Sydney Kingsford Smith

Tue 12/5

10:20-19:07

1 stop22h 47m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 12/4

07:30-06:50

1 stop33h 20m

Sydney Kingsford Smith

Mon 18/5

09:15-19:38

1 stop24h 23m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 13/4

15:28-06:55

2 stops25h 27m

Sydney Kingsford Smith

Mon 18/5

10:20-19:07

1 stop22h 47m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 1/4

07:30-07:50

1 stop33h 20m

Sydney Kingsford Smith

Sun 19/4

09:15-23:59

1 stop28h 44m

$1,736

Flights are sorted by cheapest return flights first.

Deals found on 28/1

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 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?

Use this chart to determine the optimal time to book a return flight from Boston to Sydney. Price data was last updated on 23 January 2026.

The best time to book flights from Boston to Sydney is 73 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 $358). Flying from Boston to Sydney in January is currently the most expensive (average of $1,571). 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?

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 January 2026.
Check out reviews from past customers who have flown with Qantas Airways, United Airlines, andAmerican 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
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
Qantas Airways
7.5
Good
981 reviews
Qantas Airways
7.5
Good
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
United Airlines
7.4
Good
9,214 reviews
Qantas Airways
7.5
Good
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
American Airlines
7.2
Good
11,205 reviews
Qantas Airways
7.5
Good
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.

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 $1,718, Turkish Airlines can have you in Sydney from Boston in 26h. Airlines will cover a distance of 16240 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,162. Additional round-trip tickets that might be worth considering are offered by Qantas Airways and American Airlines, with the lowest prices starting at $1,402 and $1,415, respectively. United Airlines is 42% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Boston to Sydney one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $648. Users have also found prices from $779 and $968 on Virgin Australia and Qantas Airways, respectively.

  • 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 $358). Flying from Boston to Sydney in January is currently the most expensive (average of $1,571). 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
Manly
Katoomba
Terrigal
Lithgow
Leura
Coogee
Cronulla
Randwick
Bondi Beach

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 3 airlines flying from Boston to Sydney

Discover the top 3 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 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,162Average$1,803FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Qantas AirwaysCheapest$1,402Average$3,261FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,415Average$2,038FlexibilityNo cancel feeOn-time71%
Search American 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.

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