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Cheap flights from Boston to Sydney from $754

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
15 Apr — 22 Apr1
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 16 March 2026.

Sun 3/505:50
BOS
-
SYD
2 stops35h 30m
Air Canada
Sat 9/509:20
SYD
-
BOS
2 stops38h 25m
Air Canada
Deal found 14/3$1,667
Tue 14/415:05
BOS
-
SYD
2 stops26h 15m
Multiple Airlines
Tue 21/409:20
SYD
-
BOS
3 stops38h 29m
Multiple Airlines
Deal found 15/3$1,669
Mon 27/410:40
BOS
-
SYD
3 stops30h 40m
Air Canada
Tue 12/509:20
SYD
-
BOS
2 stops26h 07m
Air Canada
Deal found 15/3$1,670
Tue 11/810:50
BOS
-
SYD
1 stop30h 30m
Air New Zealand
Tue 25/809:20
SYD
-
BOS
2 stops38h 33m
Air New Zealand
Deal found 12/3$1,671
Mon 18/512:30
BOS
-
SYD
2 stops28h 50m
Air Canada
Thu 4/609:20
SYD
-
BOS
2 stops26h 07m
Air Canada
Deal found 14/3$1,674
Mon 11/510:35
BOS
-
SYD
3 stops30h 45m
Air Canada
Fri 22/509:20
SYD
-
BOS
2 stops26h 07m
Air Canada
Deal found 15/3$1,678
Sat 2/518:55
BOS
-
SYD
2 stops46h 25m
Air Canada
Sat 9/509:20
SYD
-
BOS
3 stops26h 07m
Air Canada
Deal found 13/3$1,686
Sat 2/510:35
BOS
-
SYD
2 stops30h 45m
Air Canada
Sun 24/509:20
SYD
-
BOS
2 stops26h 07m
Air Canada
Deal found 13/3$1,688
Fri 11/910:40
BOS
-
SYD
2 stops30h 40m
Air Canada
Sun 27/909:20
SYD
-
BOS
2 stops38h 30m
Air Canada
Deal found 15/3$1,691
Mon 4/510:35
BOS
-
SYD
2 stops30h 45m
Multiple Airlines
Mon 8/609:20
SYD
-
BOS
2 stops46h 25m
Multiple Airlines
Deal found 14/3$1,693

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 16 March 2026.

Round-trip from

$1,667

One-way from

$754

Popular in

December

Cheapest in

September

Average price

$1,870
Air Canada
  • Air Canada
  • 3/5-9/5
  • 4 total stops
  • 73h 55m total
  • Boston to Sydney
Search Deals
23/8
  • 23/8
  • 2 total stops
  • 39h 35m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($377 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($93 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 16 March 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

Mon 4/5

08:05-08:45

3 stops34h 40m

Sydney Kingsford Smith

Mon 8/6

11:55-23:19

2 stops25h 24m

$1,944

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 11/5

22:00-20:25

2 stops32h 25m

Sydney Kingsford Smith

Fri 22/5

14:50-15:05

1 stop38h 15m

$1,970

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 19/4

17:20-06:50

1 stop23h 30m

Sydney Kingsford Smith

Mon 27/4

09:15-23:59

1 stop28h 44m

$2,002

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 28/4

18:01-06:55

1 stop22h 54m

Sydney Kingsford Smith

Wed 13/5

09:30-16:55

1 stop21h 25m

$2,002
Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 23/4

18:01-06:55

1 stop22h 54m

Sydney Kingsford Smith

Sun 10/5

10:20-17:14

1 stop20h 54m

$2,073

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 29/5

05:45-07:00

2 stops35h 15m

Sydney Kingsford Smith

Mon 8/6

09:30-17:20

1 stop21h 50m

$2,075

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 18/5

08:05-07:00

2 stops32h 55m

Sydney Kingsford Smith

Thu 4/6

10:20-01:11

1 stop28h 51m

$2,075

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 27/7

17:00-06:50

1 stop23h 50m

Sydney Kingsford Smith

Fri 28/8

09:15-19:45

2 stops24h 30m

$2,109

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 1/5

12:30-08:45

3 stops30h 15m

Sydney Kingsford Smith

Fri 8/5

11:55-23:35

2 stops25h 40m

$2,117

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 28/5

05:45-07:00

2 stops35h 15m

Sydney Kingsford Smith

Thu 11/6

10:20-18:59

1 stop22h 39m

$2,146

Flights are sorted by cheapest return flights first.

Deals found on 13/3

Showing 1-10 of 23 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?

Use this chart to determine the optimal time to book a return flight from Boston to Sydney. Price data was last updated on 13 March 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 $356). Flying from Boston to Sydney in January is currently the most expensive (average of $1,562). 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 16 March 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
1,004 reviews
Check prices

Crew

8.1

Entertainment

7.2

Food

7.0

Boarding

7.7

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Qantas Airways
7.5
Good
1,004 reviews
Qantas Airways
7.5
Good
1,004 reviews
Check prices

Crew

8.1

Entertainment

7.2

Food

7.0

Boarding

7.7

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
United Airlines
7.4
Good
9,429 reviews
Qantas Airways
7.5
Good
1,004 reviews
Check prices

Crew

8.1

Entertainment

7.2

Food

7.0

Boarding

7.7

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.

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 $2,002, Qatar Airways can have you in Sydney from Boston in 22h 54m. 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 Qantas Airways is currently your cheapest option to Sydney, with prices starting at $1,394. Another option worth looking into is United Airlines, starting at $1,654 round trip. Qantas Airways is 33% 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 $644. Users have also found prices from $775 and $957 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 $356). Flying from Boston to Sydney in January is currently the most expensive (average of $1,562). 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
Terrigal
Lithgow
Bondi Beach
Coogee
Cronulla
Leura
Randwick

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 16 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,394Average$2,827FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
United AirlinesCheapest$1,654Average$2,038FlexibilityNo 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.

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