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Cheap flights from Boston to Sydney from $781

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Sydney departing on 8/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Find the cheapest flights from Boston to Sydney

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
09:15 - 12:35
BOS
-
SYD
35h 20m2 stops
Multiple Airlines Logo
14:00 - 05:00
SYD
-
BOS
31h 00m2 stops
$1,391Multiple Airlines
Tue, 27 Jan - Tue, 3 Feb
Qantas Airways Logo
17:20 - 09:00
BOS
-
SYD
23h 40m1 stop
Qantas Airways Logo
07:05 - 18:47
SYD
-
BOS
27h 42m2 stops
$1,429Qantas Airways
Mon, 2 Feb - Mon, 16 Feb
Qantas Airways Logo
19:00 - 17:40
BOS
-
SYD
30h 40m2 stops
Qantas Airways Logo
11:20 - 22:08
SYD
-
BOS
26h 48m1 stop
$1,462Qantas Airways
Thu, 5 Feb - Sun, 15 Feb
Qantas Airways Logo
16:45 - 09:00
BOS
-
SYD
24h 15m1 stop
Qantas Airways Logo
19:15 - 18:47
SYD
-
BOS
39h 32m2 stops
$1,463Qantas Airways
Thu, 26 Feb - Tue, 3 Mar
Qantas Airways Logo
19:00 - 17:40
BOS
-
SYD
30h 40m2 stops
Qantas Airways Logo
11:20 - 16:21
SYD
-
BOS
21h 01m1 stop
$1,465Qantas Airways
Sun, 1 Feb - Sun, 8 Feb
Qantas Airways Logo
11:00 - 07:25
BOS
-
SYD
28h 25m1 stop
Qantas Airways Logo
19:15 - 17:56
SYD
-
BOS
38h 41m2 stops
$1,474Qantas Airways
Tue, 27 Jan - Tue, 3 Feb
Multiple Airlines Logo
06:15 - 12:35
BOS
-
SYD
38h 20m2 stops
Multiple Airlines Logo
14:00 - 05:00
SYD
-
BOS
30h 00m2 stops
$1,480Multiple Airlines
Fri, 27 Feb - Mon, 9 Mar
Qantas Airways Logo
19:00 - 07:25
BOS
-
SYD
44h 25m1 stop
Qantas Airways Logo
17:50 - 15:29
SYD
-
BOS
37h 39m2 stops
$1,489Qantas Airways
Mon, 26 Jan - Sat, 7 Feb
Qantas Airways Logo
19:00 - 07:25
BOS
-
SYD
44h 25m1 stop
Qantas Airways Logo
19:15 - 17:56
SYD
-
BOS
38h 41m2 stops
$1,490Qantas Airways
Mon, 26 Jan - Sat, 7 Feb
Air Canada Logo
15:35 - 09:35
BOS
-
SYD
26h 00m2 stops
Air Canada Logo
11:20 - 09:32
SYD
-
BOS
38h 12m2 stops
$1,507Air Canada
Tue, 3 Feb - Tue, 10 Feb

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
2 Feb
BOS17:20Boston Logan Intl
23h 40m
1 stop
SYD09:00Sydney Kingsford Smith
16 Feb
SYD07:05Sydney Kingsford Smith
27h 42m
2 stops
BOS18:47Boston Logan Intl
$1,429
Find similar
Qantas Airways
5 Feb
BOS19:00Boston Logan Intl
30h 40m
2 stops
SYD17:40Sydney Kingsford Smith
15 Feb
SYD11:20Sydney Kingsford Smith
26h 48m
1 stop
BOS22:08Boston Logan Intl
$1,462
Find similar
Qantas Airways
26 Feb
BOS16:45Boston Logan Intl
24h 15m
1 stop
SYD09:00Sydney Kingsford Smith
3 Mar
SYD19:15Sydney Kingsford Smith
39h 32m
2 stops
BOS18:47Boston Logan Intl
$1,463
Find similar

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets
Air Canada
3 Feb
BOS15:35Boston Logan Intl
26h 00m
2 stops
SYD09:35Sydney Kingsford Smith
10 Feb
SYD11:20Sydney Kingsford Smith
38h 12m
2 stops
BOS09:32Boston Logan Intl
$1,507
Find similar
Air Canada
3 Feb
BOS10:15Boston Logan Intl
31h 20m
3 stops
SYD09:35Sydney Kingsford Smith
10 Feb
SYD11:20Sydney Kingsford Smith
24h 22m
2 stops
BOS19:42Boston Logan Intl
$1,517
Find similar
Air Canada
3 Feb
BOS06:15Boston Logan Intl
35h 20m
1 stop
SYD09:35Sydney Kingsford Smith
10 Feb
SYD11:20Sydney Kingsford Smith
27h 17m
1 stop
BOS22:37Boston Logan Intl
$1,525
Find similar

momondo 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, momondo users made 78,305 searches. Data last updated 14 December 2025.
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

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 27/1

09:15-12:35

2 stops35h 20m

Sydney Kingsford Smith

Tue 3/2

14:00-05:00

2 stops31h 00m

$1,391

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 2/2

17:20-09:00

1 stop23h 40m

Sydney Kingsford Smith

Mon 16/2

07:05-18:47

2 stops27h 42m

$1,429

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 5/2

19:00-17:40

2 stops30h 40m

Sydney Kingsford Smith

Sun 15/2

11:20-22:08

1 stop26h 48m

$1,462

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

16:45-09:00

1 stop24h 15m

Sydney Kingsford Smith

Tue 3/3

19:15-18:47

2 stops39h 32m

$1,463

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 1/2

19:00-17:40

2 stops30h 40m

Sydney Kingsford Smith

Sun 8/2

11:20-16:21

1 stop21h 01m

$1,465

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 27/1

11:00-07:25

1 stop28h 25m

Sydney Kingsford Smith

Tue 3/2

19:15-17:56

2 stops38h 41m

$1,474

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 27/2

06:15-12:35

2 stops38h 20m

Sydney Kingsford Smith

Mon 9/3

14:00-05:00

2 stops30h 00m

$1,480

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 26/1

19:00-07:25

1 stop44h 25m

Sydney Kingsford Smith

Sat 7/2

17:50-15:29

2 stops37h 39m

$1,489

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 26/1

19:00-07:25

1 stop44h 25m

Sydney Kingsford Smith

Sat 7/2

19:15-17:56

2 stops38h 41m

$1,490

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 3/2

15:35-09:35

2 stops26h 00m

Sydney Kingsford Smith

Tue 10/2

11:20-09:32

2 stops38h 12m

$1,507

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Sydney from

How to get the cheapest flight ticket from Boston to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Sydney?

The month of September is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,833. If you aren’t able to travel to Sydney during the month of September, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,858.

What is the cheapest day to depart on your flight to Sydney?

Our data shows that Tuesday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $2,025. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,422.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the evening. momondo users have found flights departing from Boston to Sydney in the evening for as low as $2,024. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $2,938 on average. Flights to Sydney from Boston in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,144 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Boston for as low as $1,887 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 27% on your flight if you consider stops on a Boston to Sydney flight.

How have Boston to Sydney flight prices changed over time?

As of December 2025, prices for Boston to Sydney flights are approximately 39% cheaper when compared to flights at the same time last year.

When to book flights from Boston to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Boston to Sydney (BOS to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Sydney

Fastest flight time

22h 52m

Direct flights

None
The fastest flight from Boston to Sydney takes 22h 52m
There are no direct flights from Boston to Sydney. There are no popular flight routes from Boston to Sydney.
Search flight deals

  • How far is Boston Logan Intl to Sydney Kingsford Smith by plane?

    The straight-line distance from Boston Logan Intl to Sydney Kingsford Smith is 16229.2 km. Typically, this will take 22h 52m by plane in normal conditions.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport refresh daily.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The travel and health documents required for your trip to Sydney Kingsford Smith Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Sydney Kingsford Smith Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Boston to Sydney?

Best airlines flying from Boston to Sydney

Compare and see reviews for airlines that fly from Boston to Sydney with momondo
Airline
Rating
Free cancellation
Price
United AirlinesPriceFrom $1,224Free cancellationRating
7.4
9,094 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,475Free cancellationRating
7.5
946 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,489Free cancellationRating
7.2
11,054 reviews
Search American Airlines flights

Travelling to a place near Sydney?

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

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Sydney?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Sydney from Boston.

Can I find flights from Boston to Sydney with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sydney from Boston with this policy.

How can momondo help me find flights from Boston to Sydney?

Once you have performed a search for Boston to Sydney flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Boston to Sydney right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from Boston and alert you when they change.

An easier way to manage your Sydney trip

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