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Cheap flights from Boston to Sydney from $780

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 2/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap return flights

Enter your travel dates to find the best prices.
Air Canada Logo
05:30 - 09:35BOS-SYD
36h 05m3 stops
Air Canada Logo
11:20 - 09:32SYD-BOS
38h 12m3 stops
$1,944Air Canada
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Sun, 30 Nov - Sun, 14 Dec
United Airlines Logo
07:55 - 06:20BOS-SYD
30h 25m1 stop
United Airlines Logo
12:10 - 21:42SYD-BOS
25h 32m1 stop
$1,949United Airlines
Find Deal
Mon, 26 Jan - Sat, 7 Feb
Air Canada Logo
15:20 - 07:20BOS-SYD
26h 00m2 stops
Air Canada Logo
09:20 - 09:50SYD-BOS
38h 30m2 stops
$1,950Air Canada
Find Deal
Sun, 3 May - Sat, 9 May
United Airlines Logo
08:28 - 06:55BOS-SYD
32h 27m2 stops
United Airlines Logo
10:20 - 01:05SYD-BOS
28h 45m1 stop
$1,955United Airlines
Find Deal
Sat, 18 Apr - Sun, 26 Apr
Qantas Airways Logo
18:25 - 17:30BOS-SYD
31h 05m2 stops
Qantas Airways Logo
19:15 - 17:20SYD-BOS
38h 05m2 stops
$1,956Qantas Airways
Find Deal
Wed, 10 Dec - Thu, 18 Dec
Qantas Airways Logo
16:23 - 06:55BOS-SYD
23h 32m1 stop
Qantas Airways Logo
09:10 - 16:54SYD-BOS
21h 44m1 stop
$1,958Qantas Airways
Find Deal
Sun, 29 Mar - Tue, 14 Apr
Air Canada Logo
10:35 - 07:20BOS-SYD
30h 45m3 stops
Air Canada Logo
09:20 - 09:50SYD-BOS
38h 30m2 stops
$1,959Air Canada
Find Deal
Sun, 3 May - Sat, 9 May
Qantas Airways Logo
18:00 - 09:00BOS-SYD
24h 00m1 stop
Qantas Airways Logo
11:20 - 18:47SYD-BOS
22h 27m1 stop
$1,969Qantas Airways
Find Deal
Wed, 11 Mar - Sat, 28 Mar
Multiple Airlines Logo
15:40 - 08:35BOS-SYD
25h 55m2 stops
Multiple Airlines Logo
11:20 - 18:47SYD-BOS
22h 27m1 stop
$1,972Multiple Airlines
Find Deal
Wed, 11 Mar - Tue, 17 Mar
Multiple Airlines Logo
10:35 - 07:20BOS-SYD
30h 45m2 stops
Multiple Airlines Logo
09:10 - 16:54SYD-BOS
21h 44m1 stop
$1,973Multiple Airlines
Find Deal
Mon, 11 May - Mon, 18 May

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets
United Airlines
26 Jan
BOS07:55Boston Logan Intl
30h 25m
1 stop
SYD06:20Sydney Kingsford Smith
7 Feb
SYD12:10Sydney Kingsford Smith
25h 32m
1 stop
BOS21:42Boston Logan Intl
$1,948
Find similar
United Airlines
18 Apr
BOS08:28Boston Logan Intl
32h 27m
2 stops
SYD06:55Sydney Kingsford Smith
26 Apr
SYD10:20Sydney Kingsford Smith
28h 45m
1 stop
BOS01:05Boston Logan Intl
$1,955
Find similar
United Airlines
13 Mar
BOS07:55Boston Logan Intl
35h 45m
2 stops
SYD10:40Sydney Kingsford Smith
15 Mar
SYD14:00Sydney Kingsford Smith
31h 08m
1 stop
BOS06:08Boston Logan Intl
$1,978
Find similar

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
10 Dec
BOS18:25Boston Logan Intl
31h 05m
2 stops
SYD17:30Sydney Kingsford Smith
18 Dec
SYD19:15Sydney Kingsford Smith
38h 05m
2 stops
BOS17:20Boston Logan Intl
$1,956
Find similar
Qantas Airways
29 Mar
BOS16:23Boston Logan Intl
23h 32m
1 stop
SYD06:55Sydney Kingsford Smith
15 Apr
SYD09:10Sydney Kingsford Smith
21h 44m
1 stop
BOS16:54Boston Logan Intl
$1,958
Find similar
Qantas Airways
11 Mar
BOS18:00Boston Logan Intl
24h 00m
1 stop
SYD09:00Sydney Kingsford Smith
28 Mar
SYD11:20Sydney Kingsford Smith
22h 27m
1 stop
BOS18:47Boston Logan Intl
$1,969
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 21 November 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

Sun 30/11

05:30-09:35

3 stops36h 05m

Sydney Kingsford Smith

Sun 14/12

11:20-09:32

3 stops38h 12m

$1,944

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 26/1

07:55-06:20

1 stop30h 25m

Sydney Kingsford Smith

Sat 7/2

12:10-21:42

1 stop25h 32m

$1,948

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 3/5

15:20-07:20

2 stops26h 00m

Sydney Kingsford Smith

Sat 9/5

09:20-09:50

2 stops38h 30m

$1,950

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 18/4

08:28-06:55

2 stops32h 27m

Sydney Kingsford Smith

Sun 26/4

10:20-01:05

1 stop28h 45m

$1,955

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 10/12

18:25-17:30

2 stops31h 05m

Sydney Kingsford Smith

Thu 18/12

19:15-17:20

2 stops38h 05m

$1,956

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 29/3

16:23-06:55

1 stop23h 32m

Sydney Kingsford Smith

Tue 14/4

09:10-16:54

1 stop21h 44m

$1,958

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 3/5

10:35-07:20

3 stops30h 45m

Sydney Kingsford Smith

Sat 9/5

09:20-09:50

2 stops38h 30m

$1,959

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 11/3

18:00-09:00

1 stop24h 00m

Sydney Kingsford Smith

Sat 28/3

11:20-18:47

1 stop22h 27m

$1,969

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 11/3

15:40-08:35

2 stops25h 55m

Sydney Kingsford Smith

Tue 17/3

11:20-18:47

1 stop22h 27m

$1,972

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 11/5

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Mon 18/5

09:10-16:54

1 stop21h 44m

$1,973

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 March is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,881. If you aren’t able to travel to Sydney during the month of March, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $1,885.

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 $2,083. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,491.

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 $2,082. 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 $3,022 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 $2,195 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 $1,890 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 24% 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 November 2025, prices for Boston to Sydney flights are approximately 38% 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

Direct flights

None
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 55m 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
Air CanadaPriceFrom $1,178Free cancellationRating
7.1
10,463 reviews
Search Air Canada flights
United AirlinesPriceFrom $1,259Free cancellationRating
7.4
9,029 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,517Free cancellationRating
7.5
942 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,531Free cancellationRating
7.2
11,047 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

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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