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Cheap flights from Boston to Sydney from $752

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 18/11. 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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Find the cheapest flights from Boston to Sydney (BOS-SYD)

Cheap return flights

Logo
07:20 - 07:05BOS-SYD
33h 45m2 stops
Logo
10:20 - 09:55SYD-BOS
38h 35m2 stops
$1,433
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Wed, 1 Oct - Wed, 8 Oct
Qantas Airways Logo
12:00 - 12:15BOS-SYD
32h 15m2 stops
Qantas Airways Logo
14:20 - 21:05SYD-BOS
22h 45m1 stop
$1,657Qantas Airways
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Wed, 5 Nov - Tue, 3 Mar
United Airlines Logo
12:30 - 07:00BOS-SYD
28h 30m3 stops
United Airlines Logo
09:30 - 07:18SYD-BOS
35h 48m1 stop
$1,679United Airlines
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Tue, 2 Sep - Sat, 6 Sep
United Airlines Logo
18:18 - 06:55BOS-SYD
22h 37m1 stop
United Airlines Logo
09:30 - 07:18SYD-BOS
35h 48m1 stop
$1,683United Airlines
Find Deal
Tue, 2 Sep - Sat, 6 Sep
Delta Logo
11:00 - 06:35BOS-SYD
29h 35m1 stop
Delta Logo
09:25 - 23:53SYD-BOS
28h 28m1 stop
$1,714Delta
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Mon, 8 Sep - Sun, 28 Sep
Delta Logo
15:15 - 06:35BOS-SYD
25h 20m2 stops
Delta Logo
09:25 - 23:02SYD-BOS
27h 37m2 stops
$1,720Delta
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Tue, 16 Sep - Tue, 23 Sep
Fiji Airways Logo
16:23 - 21:50BOS-SYD
37h 27m2 stops
Fiji Airways Logo
06:00 - 23:05SYD-BOS
32h 05m2 stops
$1,726Fiji Airways
Find Deal
Tue, 3 Feb - Tue, 10 Mar
Fiji Airways Logo
18:13 - 12:45BOS-SYD
27h 32m2 stops
Fiji Airways Logo
14:30 - 21:35SYD-BOS
23h 05m2 stops
$1,728Fiji Airways
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Tue, 28 Oct - Sat, 15 Nov
Air Canada Logo
10:15 - 09:35BOS-SYD
31h 20m2 stops
Air Canada Logo
11:20 - 09:32SYD-BOS
38h 12m2 stops
$1,798Air Canada
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Sun, 8 Feb - Tue, 17 Feb
Air Canada Logo
10:15 - 09:35BOS-SYD
31h 20m3 stops
Air Canada Logo
11:20 - 09:32SYD-BOS
38h 12m2 stops
$1,809Air Canada
Find Deal
Sun, 8 Feb - Tue, 17 Feb

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
5 Nov
BOS12:00Boston Logan Intl
32h 15m
2 stops
SYD12:15Sydney Kingsford Smith
3 Mar
SYD14:20Sydney Kingsford Smith
22h 45m
1 stop
BOS21:05Boston Logan Intl
$1,657
Find similar
Qantas Airways
2 Feb
BOS18:00Boston Logan Intl
34h 50m
2 stops
SYD20:50Sydney Kingsford Smith
15 Feb
SYD11:15Sydney Kingsford Smith
21h 29m
1 stop
BOS16:44Boston Logan Intl
$1,677
Find similar
Qantas Airways
30 Jan
BOS08:15Boston Logan Intl
36h 00m
2 stops
SYD12:15Sydney Kingsford Smith
14 Feb
SYD14:20Sydney Kingsford Smith
20h 32m
1 stop
BOS18:52Boston Logan Intl
$1,703
Find similar

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets
United Airlines
2 Sept
BOS12:30Boston Logan Intl
28h 30m
3 stops
SYD07:00Sydney Kingsford Smith
6 Sept
SYD09:30Sydney Kingsford Smith
35h 48m
1 stop
BOS07:18Boston Logan Intl
$1,679
Find similar
United Airlines
2 Sept
BOS18:18Boston Logan Intl
22h 37m
1 stop
SYD06:55Sydney Kingsford Smith
6 Sept
SYD09:30Sydney Kingsford Smith
35h 48m
1 stop
BOS07:18Boston Logan Intl
$1,683
Find similar
United Airlines
2 Sept
BOS15:15Boston Logan Intl
25h 40m
2 stops
SYD06:55Sydney Kingsford Smith
25 Nov
SYD12:10Sydney Kingsford Smith
23h 10m
2 stops
BOS19:20Boston Logan Intl
$1,697
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 18 August 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

Wed 1/10

07:20-07:05

2 stops33h 45m

Sydney Kingsford Smith

Wed 8/10

10:20-09:55

2 stops38h 35m

$1,433

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 5/11

12:00-12:15

2 stops32h 15m

Sydney Kingsford Smith

Tue 3/3

14:20-21:05

1 stop22h 45m

$1,657

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 2/9

12:30-07:00

3 stops28h 30m

Sydney Kingsford Smith

Sat 6/9

09:30-07:18

1 stop35h 48m

$1,679

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 2/9

18:18-06:55

1 stop22h 37m

Sydney Kingsford Smith

Sat 6/9

09:30-07:18

1 stop35h 48m

$1,683

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 8/9

11:00-06:35

1 stop29h 35m

Sydney Kingsford Smith

Sun 28/9

09:25-23:53

1 stop28h 28m

$1,714

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 16/9

15:15-06:35

2 stops25h 20m

Sydney Kingsford Smith

Tue 23/9

09:25-23:02

2 stops27h 37m

$1,720

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 3/2

16:23-21:50

2 stops37h 27m

Sydney Kingsford Smith

Tue 10/3

06:00-23:05

2 stops32h 05m

$1,726

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 28/10

18:13-12:45

2 stops27h 32m

Sydney Kingsford Smith

Sat 15/11

14:30-21:35

2 stops23h 05m

$1,728

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 8/2

10:15-09:35

2 stops31h 20m

Sydney Kingsford Smith

Tue 17/2

11:20-09:32

2 stops38h 12m

$1,798

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 8/2

10:15-09:35

3 stops31h 20m

Sydney Kingsford Smith

Tue 17/2

11:20-09:32

2 stops38h 12m

$1,809

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 April is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,944. If you aren’t able to travel to Sydney during the month of April, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,946.

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 $2,070. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,476.

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 $2,070. 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 $3,003 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 $2,201 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 $1,847 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 28% 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 August 2025, prices for Boston to Sydney flights are approximately 36% 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

Best price found

$752

Fastest flight time

22h 37m

Direct flights

None

Airports in Sydney

1 airport
The best one-way flight to Sydney from Boston in the past 72 hours is $752. The best return flight deal from Boston to Sydney found on momondo in the last 72 hours is $1,433.
The fastest flight from Boston to Sydney takes 22h 37m
There are no direct flights from Boston to Sydney. Popular non-direct route for this connection is Boston Logan Intl Airport - Sydney Kingsford Smith Airport.
There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)
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 20m 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 $1,171Free cancellationRating
7.1
9,992 reviews
Search Air Canada flights
United AirlinesPriceFrom $1,252Free cancellationRating
7.4
8,925 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $2,104Free cancellationRating
7.5
896 reviews
Search Qantas Airways flights

Travelling to a place near Sydney?

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