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Cheap flights from Boston to Sydney from $675

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 16/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap return flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
16:50 - 07:35
BOS
-
SYD
46h 45m
2 stops
Qantas Airways Logo
11:20 - 18:40
SYD
-
BOS
23h 20m
1 stop
$1,282Qantas Airways
Sat, 28 Feb - Sat, 7 Mar
Qantas Airways Logo
07:15 - 07:35
BOS
-
SYD
56h 20m
2 stops
Qantas Airways Logo
11:20 - 21:59
SYD
-
BOS
26h 39m
1 stop
$1,297Qantas Airways
Sun, 1 Mar - Sun, 8 Mar
Qantas Airways Logo
11:00 - 09:00
BOS
-
SYD
30h 00m
1 stop
Qantas Airways Logo
07:05 - 18:40
SYD
-
BOS
27h 35m
2 stops
$1,318Qantas Airways
Tue, 10 Feb - Sun, 15 Feb
Qantas Airways Logo
07:15 - 07:25
BOS
-
SYD
32h 10m
1 stop
Qantas Airways Logo
17:50 - 17:14
SYD
-
BOS
38h 24m
2 stops
$1,520Qantas Airways
Wed, 4 Mar - Tue, 10 Mar
Qantas Airways Logo
16:50 - 09:00
BOS
-
SYD
24h 10m
1 stop
Qantas Airways Logo
07:05 - 18:40
SYD
-
BOS
27h 35m
2 stops
$1,533Qantas Airways
Sun, 22 Feb - Wed, 4 Mar
Qantas Airways Logo
09:00 - 09:00
BOS
-
SYD
32h 00m
1 stop
Qantas Airways Logo
07:05 - 18:40
SYD
-
BOS
27h 35m
2 stops
$1,534Qantas Airways
Thu, 26 Feb - Tue, 3 Mar
Qantas Airways Logo
16:50 - 20:50
BOS
-
SYD
36h 00m
2 stops
Qantas Airways Logo
11:20 - 22:11
SYD
-
BOS
26h 51m
1 stop
$1,538Qantas Airways
Thu, 26 Feb - Thu, 5 Mar
Qantas Airways Logo
16:50 - 20:50
BOS
-
SYD
36h 00m
2 stops
Qantas Airways Logo
11:20 - 22:11
SYD
-
BOS
26h 51m
1 stop
$1,558Qantas Airways
Thu, 26 Feb - Tue, 3 Mar
Qantas Airways Logo
17:30 - 08:05
BOS
-
SYD
23h 35m
1 stop
Qantas Airways Logo
17:50 - 08:04
SYD
-
BOS
28h 14m
1 stop
$1,594Qantas Airways
Fri, 3 Apr - Sun, 12 Apr
Air Canada Logo
10:15 - 09:35
BOS
-
SYD
31h 20m
2 stops
Air Canada Logo
11:20 - 09:32
SYD
-
BOS
38h 12m
2 stops
$1,604Air Canada
Thu, 26 Feb - Thu, 5 Mar

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets
Air Canada
26 Feb
BOS10:15Boston Logan Intl
31h 20m
2 stops
SYD09:35Sydney Kingsford Smith
5 Mar
SYD11:20Sydney Kingsford Smith
38h 12m
2 stops
BOS09:32Boston Logan Intl
$1,604
Air Canada
5 Apr
BOS05:30Boston Logan Intl
35h 50m
2 stops
SYD07:20Sydney Kingsford Smith
16 Apr
SYD09:20Sydney Kingsford Smith
38h 29m
2 stops
BOS09:49Boston Logan Intl
$1,608
Air Canada
5 Apr
BOS05:30Boston Logan Intl
35h 50m
2 stops
SYD07:20Sydney Kingsford Smith
17 Apr
SYD09:20Sydney Kingsford Smith
38h 29m
2 stops
BOS09:49Boston Logan Intl
$1,610

Delta flights from Boston to Sydney

Our best Delta deals on Boston to Sydney flight tickets
Delta
14 Feb
BOS18:53Boston Logan Intl
43h 57m
2 stops
SYD06:50Sydney Kingsford Smith
21 Feb
SYD10:40Sydney Kingsford Smith
24h 14m
2 stops
BOS18:54Boston Logan Intl
$1,798
Delta
14 Feb
BOS18:53Boston Logan Intl
43h 57m
2 stops
SYD06:50Sydney Kingsford Smith
21 Feb
SYD10:40Sydney Kingsford Smith
24h 14m
2 stops
BOS18:54Boston Logan Intl
$1,807
Delta
14 Feb
BOS17:45Boston Logan Intl
45h 05m
1 stop
SYD06:50Sydney Kingsford Smith
21 Feb
SYD10:40Sydney Kingsford Smith
21h 37m
1 stop
BOS16:17Boston Logan Intl
$1,811

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 31 January 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

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 28/2

16:50-07:35

2 stops46h 45m

Sydney Kingsford Smith

Sat 7/3

11:20-18:40

1 stop23h 20m

$1,282

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 1/3

07:15-07:35

2 stops56h 20m

Sydney Kingsford Smith

Sun 8/3

11:20-21:59

1 stop26h 39m

$1,297

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 10/2

11:00-09:00

1 stop30h 00m

Sydney Kingsford Smith

Sun 15/2

07:05-18:40

2 stops27h 35m

$1,318

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 4/3

07:15-07:25

1 stop32h 10m

Sydney Kingsford Smith

Tue 10/3

17:50-17:14

2 stops38h 24m

$1,520

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 22/2

16:50-09:00

1 stop24h 10m

Sydney Kingsford Smith

Wed 4/3

07:05-18:40

2 stops27h 35m

$1,533

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

09:00-09:00

1 stop32h 00m

Sydney Kingsford Smith

Tue 3/3

07:05-18:40

2 stops27h 35m

$1,534

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

16:50-20:50

2 stops36h 00m

Sydney Kingsford Smith

Thu 5/3

11:20-22:11

1 stop26h 51m

$1,538

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

16:50-20:50

2 stops36h 00m

Sydney Kingsford Smith

Tue 3/3

11:20-22:11

1 stop26h 51m

$1,558

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 3/4

17:30-08:05

1 stop23h 35m

Sydney Kingsford Smith

Sun 12/4

17:50-08:04

1 stop28h 14m

$1,594

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

10:15-09:35

2 stops31h 20m

Sydney Kingsford Smith

Thu 5/3

11:20-09:32

2 stops38h 12m

$1,604

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 $1,737. If you aren’t able to travel to Sydney during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $1,770.

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 $2,030 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 $1,788 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 13% 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 January 2026, prices for Boston to Sydney flights are approximately 19% 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 35m

Direct flights

None
The fastest flight from Boston to Sydney takes 22h 35m
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 35m 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 $1,163Free cancellationRating
7.4
9,219 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,403Free cancellationRating
7.5
982 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,417Free cancellationRating
7.2
11,213 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
Coogee
Bondi Beach
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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