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Cheap flights from Boston to Sydney from $654

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 2/5. 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 - 07:35
BOS
-
SYD
46h 45m
2 stops
Qantas Airways Logo
11:20 - 18:40
SYD
-
BOS
23h 20m
1 stop
$1,402Qantas Airways
Sat, 28 Feb - Sat, 7 Mar
Air Canada Logo
10:35 - 07:20
BOS
-
SYD
30h 45m
3 stops
Air Canada Logo
09:20 - 09:45
SYD
-
BOS
38h 25m
2 stops
$1,590Air Canada
Mon, 4 May - Mon, 11 May
Air Canada Logo
15:35 - 09:35
BOS
-
SYD
26h 00m
2 stops
Air Canada Logo
11:20 - 09:32
SYD
-
BOS
38h 12m
3 stops
$1,591Air Canada
Tue, 3 Feb - Wed, 11 Feb
Air Canada Logo
18:55 - 09:35
BOS
-
SYD
46h 40m
2 stops
Air Canada Logo
11:20 - 11:12
SYD
-
BOS
39h 52m
2 stops
$1,594Air Canada
Sat, 28 Feb - Sun, 8 Mar
Air Canada Logo
10:15 - 09:35
BOS
-
SYD
31h 20m
3 stops
Air Canada Logo
10:20 - 22:37
SYD
-
BOS
27h 17m
2 stops
$1,597Air Canada
Tue, 3 Mar - Tue, 17 Mar
Air Canada Logo
05:30 - 07:20
BOS
-
SYD
35h 50m
2 stops
Air Canada Logo
09:20 - 22:38
SYD
-
BOS
27h 18m
1 stop
$1,601Air Canada
Sun, 5 Apr - Wed, 15 Apr
Air Canada Logo
06:15 - 09:35
BOS
-
SYD
35h 20m
1 stop
Air Canada Logo
11:20 - 22:37
SYD
-
BOS
27h 17m
1 stop
$1,609Air Canada
Tue, 10 Feb - Sun, 15 Feb
Air Canada Logo
10:15 - 08:35
BOS
-
SYD
31h 20m
2 stops
Air Canada Logo
09:20 - 22:38
SYD
-
BOS
27h 18m
2 stops
$1,616Air Canada
Tue, 24 Mar - Fri, 10 Apr
Air Canada Logo
10:40 - 07:20
BOS
-
SYD
30h 40m
2 stops
Air Canada Logo
09:20 - 09:49
SYD
-
BOS
38h 29m
3 stops
$1,620Air Canada
Sun, 5 Apr - Thu, 16 Apr
Air Canada Logo
10:15 - 08:35
BOS
-
SYD
31h 20m
3 stops
Air Canada Logo
09:20 - 22:38
SYD
-
BOS
27h 18m
2 stops
$1,628Air Canada
Tue, 24 Mar - Fri, 10 Apr

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
28 Feb
BOS16:50Boston Logan Intl
46h 45m
2 stops
SYD07:35Sydney Kingsford Smith
7 Mar
SYD11:20Sydney Kingsford Smith
23h 20m
1 stop
BOS18:40Boston Logan Intl
$1,402
Qantas Airways
31 Jan
BOS17:20Boston Logan Intl
23h 40m
1 stop
SYD09:00Sydney Kingsford Smith
9 Feb
SYD17:50Sydney Kingsford Smith
37h 39m
2 stops
BOS15:29Boston Logan Intl
$1,421
Qantas Airways
1 Feb
BOS14:13Boston Logan Intl
35h 27m
2 stops
SYD17:40Sydney Kingsford Smith
28 Feb
SYD11:20Sydney Kingsford Smith
34h 54m
1 stop
BOS06:14Boston Logan Intl
$1,505

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets
United Airlines
25 Jan
BOS12:45Boston Logan Intl
25h 35m
2 stops
SYD06:20Sydney Kingsford Smith
8 Feb
SYD11:20Sydney Kingsford Smith
23h 37m
2 stops
BOS18:57Boston Logan Intl
$1,757
United Airlines
2 Feb
BOS10:56Boston Logan Intl
30h 19m
1 stop
SYD09:15Sydney Kingsford Smith
15 Mar
SYD11:50Sydney Kingsford Smith
21h 38m
1 stop
BOS18:28Boston Logan Intl
$1,769
United Airlines
31 Jan
BOS19:22Boston Logan Intl
43h 38m
2 stops
SYD07:00Sydney Kingsford Smith
9 Feb
SYD11:20Sydney Kingsford Smith
23h 37m
2 stops
BOS18:57Boston Logan Intl
$1,776

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 24 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

$1,402

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 4/5

10:35-07:20

3 stops30h 45m

Sydney Kingsford Smith

Mon 11/5

09:20-09:45

2 stops38h 25m

$1,590

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 3/2

15:35-09:35

2 stops26h 00m

Sydney Kingsford Smith

Wed 11/2

11:20-09:32

3 stops38h 12m

$1,591

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 28/2

18:55-09:35

2 stops46h 40m

Sydney Kingsford Smith

Sun 8/3

11:20-11:12

2 stops39h 52m

$1,594

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 3/3

10:15-09:35

3 stops31h 20m

Sydney Kingsford Smith

Tue 17/3

10:20-22:37

2 stops27h 17m

$1,597

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 5/4

05:30-07:20

2 stops35h 50m

Sydney Kingsford Smith

Wed 15/4

09:20-22:38

1 stop27h 18m

$1,601

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 10/2

06:15-09:35

1 stop35h 20m

Sydney Kingsford Smith

Sun 15/2

11:20-22:37

1 stop27h 17m

$1,609

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 24/3

10:15-08:35

2 stops31h 20m

Sydney Kingsford Smith

Fri 10/4

09:20-22:38

2 stops27h 18m

$1,616

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 5/4

10:40-07:20

2 stops30h 40m

Sydney Kingsford Smith

Thu 16/4

09:20-09:49

3 stops38h 29m

$1,620

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 24/3

10:15-08:35

3 stops31h 20m

Sydney Kingsford Smith

Fri 10/4

09:20-22:38

2 stops27h 18m

$1,628

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 $1,770. 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 $1,772.

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 $2,069 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 $1,802 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 20% 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

23h 35m

Direct flights

None
The fastest flight from Boston to Sydney takes 23h 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 23h 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 $1,186Free cancellationRating
7.4
9,193 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,430Free cancellationRating
7.5
975 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,444Free cancellationRating
7.2
11,193 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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