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Cheap flights from Boston to Sydney from $742

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 24/3. 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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Find the cheapest flights from Boston to Sydney

Cheap return flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
16:50 - 09:00
BOS
-
SYD
24h 10m
1 stop
Qantas Airways Logo
17:50 - 15:13
SYD
-
BOS
37h 23m
2 stops
$1,285Qantas Airways
Tue, 17 Feb - Thu, 26 Feb
Qantas Airways Logo
16:50 - 09:00
BOS
-
SYD
24h 10m
1 stop
Qantas Airways Logo
17:50 - 15:13
SYD
-
BOS
37h 23m
2 stops
$1,287Qantas Airways
Thu, 19 Feb - Mon, 23 Feb
Air Canada Logo
10:40 - 07:20
BOS
-
SYD
30h 40m
2 stops
Air Canada Logo
09:20 - 09:50
SYD
-
BOS
38h 30m
2 stops
$1,486Air Canada
Fri, 24 Apr - Fri, 19 Jun
Air Canada Logo
10:35 - 07:20
BOS
-
SYD
30h 45m
2 stops
Air Canada Logo
09:20 - 09:45
SYD
-
BOS
38h 25m
3 stops
$1,499Air Canada
Fri, 29 May - Fri, 12 Jun
Qantas Airways Logo
16:50 - 09:00
BOS
-
SYD
24h 10m
1 stop
Qantas Airways Logo
17:50 - 17:14
SYD
-
BOS
38h 24m
2 stops
$1,500Qantas Airways
Wed, 4 Mar - Tue, 10 Mar
Qantas Airways Logo
07:15 - 20:50
BOS
-
SYD
45h 35m
2 stops
Qantas Airways Logo
11:20 - 22:11
SYD
-
BOS
26h 51m
1 stop
$1,516Qantas Airways
Thu, 26 Feb - Tue, 3 Mar
Qantas Airways Logo
07:15 - 20:50
BOS
-
SYD
45h 35m
2 stops
Qantas Airways Logo
11:20 - 18:40
SYD
-
BOS
23h 20m
1 stop
$1,517Qantas Airways
Thu, 26 Feb - Tue, 3 Mar
Air New Zealand Logo
10:35 - 07:20
BOS
-
SYD
30h 45m
2 stops
Air New Zealand Logo
09:20 - 17:45
SYD
-
BOS
46h 25m
2 stops
$1,523Air New Zealand
Thu, 14 May - Fri, 29 May
Air Canada Logo
10:40 - 07:20
BOS
-
SYD
30h 40m
2 stops
Air Canada Logo
09:20 - 21:27
SYD
-
BOS
26h 07m
2 stops
$1,525Air Canada
Sun, 5 Apr - Thu, 16 Apr
Air Canada Logo
10:15 - 08:35
BOS
-
SYD
31h 20m
2 stops
Air Canada Logo
09:20 - 09:49
SYD
-
BOS
38h 29m
2 stops
$1,526Air Canada
Tue, 24 Mar - Fri, 10 Apr

Air New Zealand flights from Boston to Sydney

Our best Air New Zealand deals on Boston to Sydney flight tickets
Air New Zealand
14 May
BOS10:35Boston Logan Intl
30h 45m
2 stops
SYD07:20Sydney Kingsford Smith
29 May
SYD09:20Sydney Kingsford Smith
46h 25m
2 stops
BOS17:45Boston Logan Intl
$1,523
Air New Zealand
31 July
BOS10:40Boston Logan Intl
30h 40m
2 stops
SYD07:20Sydney Kingsford Smith
27 Aug
SYD09:20Sydney Kingsford Smith
27h 18m
1 stop
BOS22:38Boston Logan Intl
$1,535
Air New Zealand
14 May
BOS10:35Boston Logan Intl
30h 45m
2 stops
SYD07:20Sydney Kingsford Smith
29 May
SYD09:20Sydney Kingsford Smith
27h 19m
1 stop
BOS22:39Boston Logan Intl
$1,536

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets
Air Canada
24 Apr
BOS10:40Boston Logan Intl
30h 40m
2 stops
SYD07:20Sydney Kingsford Smith
19 June
SYD09:20Sydney Kingsford Smith
38h 30m
2 stops
BOS09:50Boston Logan Intl
$1,486
Air Canada
29 May
BOS10:35Boston Logan Intl
30h 45m
2 stops
SYD07:20Sydney Kingsford Smith
12 June
SYD09:20Sydney Kingsford Smith
38h 25m
3 stops
BOS09:45Boston Logan Intl
$1,499
Air Canada
5 Apr
BOS10:40Boston Logan Intl
30h 40m
2 stops
SYD07:20Sydney Kingsford Smith
16 Apr
SYD09:20Sydney Kingsford Smith
26h 07m
2 stops
BOS21:27Boston Logan Intl
$1,525

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 7 February 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

Tue 17/2

16:50-09:00

1 stop24h 10m

Sydney Kingsford Smith

Thu 26/2

17:50-15:13

2 stops37h 23m

$1,285

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 19/2

16:50-09:00

1 stop24h 10m

Sydney Kingsford Smith

Mon 23/2

17:50-15:13

2 stops37h 23m

$1,287

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 24/4

10:40-07:20

2 stops30h 40m

Sydney Kingsford Smith

Fri 19/6

09:20-09:50

2 stops38h 30m

$1,486

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 29/5

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Fri 12/6

09:20-09:45

3 stops38h 25m

$1,499

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 4/3

16:50-09:00

1 stop24h 10m

Sydney Kingsford Smith

Tue 10/3

17:50-17:14

2 stops38h 24m

$1,500

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

07:15-20:50

2 stops45h 35m

Sydney Kingsford Smith

Tue 3/3

11:20-22:11

1 stop26h 51m

$1,516

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

07:15-20:50

2 stops45h 35m

Sydney Kingsford Smith

Tue 3/3

11:20-18:40

1 stop23h 20m

$1,517

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 14/5

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Fri 29/5

09:20-17:45

2 stops46h 25m

$1,523

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 5/4

10:40-07:20

2 stops30h 40m

Sydney Kingsford Smith

Thu 16/4

09:20-21:27

2 stops26h 07m

$1,525

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 24/3

10:15-08:35

2 stops31h 20m

Sydney Kingsford Smith

Fri 10/4

09:20-09:49

2 stops38h 29m

$1,526

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 $1,731. 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 $1,764.

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 $2,024 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 $1,782 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 February 2026, prices for Boston to Sydney flights are approximately 7% 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 $1,159Free cancellationRating
7.4
9,254 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,399Free cancellationRating
7.5
988 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,412Free cancellationRating
7.2
11,249 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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