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Cheap flights from Boston to Sydney from C$ 964

BOS — SYD
11 Oct — 18 Oct1
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

Sun 18/105:45 p.m. -
1 stop23h 20m
Mon 2/112:05 p.m. -
1 stop21h 28m
Deal found 8/9C$ 1,764
Sun 18/106:40 p.m. -
1 stop22h 20m
Mon 2/1111:20 a.m. -
3 stops29h 26m
Deal found 8/9C$ 1,800
Tue 17/119:00 a.m. -
1 stop32h 20m
Tue 22/1211:50 a.m. -
2 stops28h 09m
Deal found 7/9C$ 1,810
Tue 29/99:10 a.m. -
2 stops31h 40m
Wed 14/1010:15 a.m. -
2 stops23h 39m
Deal found 10/9C$ 1,817
Sat 31/107:30 p.m. -
2 stops46h 00m
Tue 17/1110:40 a.m. -
2 stops29h 04m
Deal found 11/9C$ 1,818
Sat 31/105:17 p.m. -
1 stop46h 43m
Mon 16/1111:50 a.m. -
1 stop25h 34m
Deal found 11/9C$ 1,825
Tue 29/122:20 p.m. -
1 stop26h 40m
Tue 19/111:20 a.m. -
1 stop21h 13m
Deal found 9/9C$ 1,878
Sun 1/119:45 a.m. -
1 stop31h 35m
Sun 15/1111:50 a.m. -
1 stop23h 29m
Deal found 11/9C$ 1,880
Wed 14/1010:36 a.m. -
2 stops30h 19m
Thu 12/1111:50 a.m. -
1 stop20h 59m
Deal found 11/9C$ 1,886
Sat 7/115:17 p.m. -
1 stop45h 43m
Sat 21/119:20 a.m. -
2 stops31h 26m
Deal found 8/9C$ 1,893

Find flight deals from Boston to Sydney

Round-trip from

C$ 1,512

One-way from

C$ 964

Popular in

December

Cheapest in

March

Average price

C$ 1,856
Air Canada
  • Air Canada
  • 21/2-7/3
  • 4 total stops
  • 69h 35m total
  • Boston to Sydney
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United Airlines
  • United Airlines
  • 10/2-31/12
  • 3 total stops
  • 31h 45m total
  • Boston to Sydney
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Highest demand for flights based on searches. 13% potential increase in price (C$ 450 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease (C$ 117 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Boston to Sydney that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest round-trip

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sat 5/12

7:33 p.m.-6:20 a.m.

2 stops42h 47m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-9:00 a.m.

Nonstop0h 00m

C$ 973

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Thu 19/11

8:25 a.m.-9:20 a.m.

3 stops32h 55m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-9:00 a.m.

Nonstop0h 00m

C$ 1,047

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Thu 29/10

8:25 a.m.-9:20 a.m.

3 stops33h 55m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-9:00 a.m.

Nonstop0h 00m

C$ 1,047
Quickest round-trip

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Thu 11/2

3:19 p.m.-9:20 a.m.

2 stops26h 01m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-9:00 a.m.

Nonstop0h 00m

C$ 1,047

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sat 13/2

6:00 a.m.-9:20 a.m.

3 stops35h 20m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-9:00 a.m.

Nonstop0h 00m

C$ 1,047

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sat 10/10

8:31 p.m.-7:55 a.m.

2 stops44h 24m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-9:00 a.m.

Nonstop0h 00m

C$ 1,261

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 25/1

1:55 p.m.-9:20 a.m.

1 stop27h 25m

Sydney Kingsford Smith

Tue 2/3

1:20 p.m.-11:54 p.m.

2 stops26h 34m

C$ 1,810

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 1/2

7:30 a.m.-9:20 a.m.

1 stop33h 50m

Sydney Kingsford Smith

Wed 10/3

11:50 a.m.-11:54 p.m.

2 stops28h 04m

C$ 1,810

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 17/11

9:00 a.m.-9:20 a.m.

1 stop32h 20m

Sydney Kingsford Smith

Tue 22/12

11:50 a.m.-11:59 p.m.

2 stops28h 09m

C$ 1,810

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 22/11

1:32 p.m.-7:00 a.m.

1 stop25h 28m

Sydney Kingsford Smith

Fri 11/12

9:15 a.m.-11:18 p.m.

1 stop30h 03m

C$ 1,880

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 17 resultsSorted by cheapest first
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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

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, March is the cheapest month in which you can book a flight from Boston to Sydney (average of C$ 1,752). Flying from Boston to Sydney in December is currently the most expensive (average of C$ 2,946). 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 to fly round-trip from Boston to Sydney?

Airfare is below average for this route at the moment.

Boston to Sydney flights typically cost between C$ 1,686 and C$ 2,026 in February.
The cheapest round-trip price found within the last 5 days was C$ 1,512 on Air Canada (21 Feb-7 Mar).

Related info for your journey

  • How long is the flight from Boston to Sydney?

    Departing from Boston to Sydney will take you 33h 50m. Boston and Sydney are separated by a distance of 16240 km.

  • 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 C$ 1,752). Flying from Boston to Sydney in December is currently the most expensive (average of C$ 2,946). 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
Bondi Beach
Parramatta

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