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Cheap flights from Boston to Sydney from $774

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 1/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
09:15 - 12:35
BOS
-
SYD
35h 20m2 stops
Multiple Airlines Logo
14:00 - 05:00
SYD
-
BOS
31h 00m2 stops
$1,348Multiple Airlines
Tue, 27 Jan - Tue, 3 Feb
Qantas Airways Logo
17:20 - 09:00
BOS
-
SYD
23h 40m1 stop
Qantas Airways Logo
07:05 - 17:56
SYD
-
BOS
26h 51m2 stops
$1,366Qantas Airways
Tue, 27 Jan - Tue, 3 Feb
Multiple Airlines Logo
06:00 - 22:05
BOS
-
SYD
48h 05m2 stops
Multiple Airlines Logo
14:00 - 05:30
SYD
-
BOS
31h 30m2 stops
$1,371Multiple Airlines
Sat, 31 Jan - Fri, 13 Feb
Qantas Airways Logo
16:50 - 09:00
BOS
-
SYD
24h 10m1 stop
Qantas Airways Logo
19:15 - 18:40
SYD
-
BOS
39h 25m2 stops
$1,400Qantas Airways
Thu, 26 Feb - Tue, 3 Mar
Multiple Airlines Logo
14:45 - 12:35
BOS
-
SYD
29h 50m2 stops
Multiple Airlines Logo
13:15 - 05:18
SYD
-
BOS
30h 03m2 stops
$1,405Multiple Airlines
Wed, 25 Feb - Wed, 8 Apr
Qantas Airways Logo
08:00 - 07:25
BOS
-
SYD
31h 25m1 stop
Qantas Airways Logo
19:15 - 17:56
SYD
-
BOS
38h 41m2 stops
$1,411Qantas Airways
Mon, 26 Jan - Mon, 2 Feb
Qantas Airways Logo
11:00 - 09:20
BOS
-
SYD
30h 20m2 stops
Qantas Airways Logo
14:05 - 21:00
SYD
-
BOS
22h 55m1 stop
$1,432Qantas Airways
Wed, 28 Jan - Wed, 18 Feb
Multiple Airlines Logo
06:00 - 12:35
BOS
-
SYD
38h 35m2 stops
Multiple Airlines Logo
14:00 - 05:30
SYD
-
BOS
31h 30m2 stops
$1,445Multiple Airlines
Sun, 1 Feb - Sat, 14 Feb
Qantas Airways Logo
17:20 - 09:00
BOS
-
SYD
23h 40m1 stop
Qantas Airways Logo
19:15 - 18:47
SYD
-
BOS
39h 32m2 stops
$1,451Qantas Airways
Sun, 1 Feb - Sat, 14 Feb
Qantas Airways Logo
17:20 - 09:00
BOS
-
SYD
23h 40m1 stop
Qantas Airways Logo
07:05 - 18:40
SYD
-
BOS
27h 35m2 stops
$1,464Qantas Airways
Fri, 6 Feb - Sun, 15 Feb

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
27 Jan
BOS17:20Boston Logan Intl
23h 40m
1 stop
SYD09:00Sydney Kingsford Smith
3 Feb
SYD07:05Sydney Kingsford Smith
26h 51m
2 stops
BOS17:56Boston Logan Intl
$1,366
Find similar
Qantas Airways
31 Dec
BOS08:00Boston Logan Intl
33h 00m
1 stop
SYD09:00Sydney Kingsford Smith
31 Jan
SYD19:15Sydney Kingsford Smith
38h 41m
2 stops
BOS17:56Boston Logan Intl
$1,400
Find similar
Qantas Airways
26 Jan
BOS08:00Boston Logan Intl
31h 25m
1 stop
SYD07:25Sydney Kingsford Smith
2 Feb
SYD19:15Sydney Kingsford Smith
38h 41m
2 stops
BOS17:56Boston Logan Intl
$1,411
Find similar

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets
Air Canada
24 Mar
BOS10:15Boston Logan Intl
31h 20m
2 stops
SYD08:35Sydney Kingsford Smith
7 Apr
SYD09:20Sydney Kingsford Smith
26h 07m
2 stops
BOS21:27Boston Logan Intl
$1,618
Find similar
Air Canada
25 Mar
BOS15:35Boston Logan Intl
26h 00m
2 stops
SYD08:35Sydney Kingsford Smith
8 Apr
SYD09:20Sydney Kingsford Smith
26h 07m
2 stops
BOS21:27Boston Logan Intl
$1,619
Find similar
Air Canada
1 Mar
BOS15:35Boston Logan Intl
26h 00m
2 stops
SYD09:35Sydney Kingsford Smith
9 Mar
SYD11:20Sydney Kingsford Smith
37h 42m
2 stops
BOS10:02Boston Logan Intl
$1,624
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 29 December 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

Tue 27/1

09:15-12:35

2 stops35h 20m

Sydney Kingsford Smith

Tue 3/2

14:00-05:00

2 stops31h 00m

$1,348

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 27/1

17:20-09:00

1 stop23h 40m

Sydney Kingsford Smith

Tue 3/2

07:05-17:56

2 stops26h 51m

$1,366

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 31/1

06:00-22:05

2 stops48h 05m

Sydney Kingsford Smith

Fri 13/2

14:00-05:30

2 stops31h 30m

$1,371

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 26/2

16:50-09:00

1 stop24h 10m

Sydney Kingsford Smith

Tue 3/3

19:15-18:40

2 stops39h 25m

$1,400

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 25/2

14:45-12:35

2 stops29h 50m

Sydney Kingsford Smith

Wed 8/4

13:15-05:18

2 stops30h 03m

$1,405

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 26/1

08:00-07:25

1 stop31h 25m

Sydney Kingsford Smith

Mon 2/2

19:15-17:56

2 stops38h 41m

$1,411

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 28/1

11:00-09:20

2 stops30h 20m

Sydney Kingsford Smith

Wed 18/2

14:05-21:00

1 stop22h 55m

$1,432

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 1/2

06:00-12:35

2 stops38h 35m

Sydney Kingsford Smith

Sat 14/2

14:00-05:30

2 stops31h 30m

$1,445

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 1/2

17:20-09:00

1 stop23h 40m

Sydney Kingsford Smith

Sat 14/2

19:15-18:47

2 stops39h 32m

$1,451

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 6/2

17:20-09:00

1 stop23h 40m

Sydney Kingsford Smith

Sun 15/2

07:05-18:40

2 stops27h 35m

$1,464

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 typical price of a round-trip flight between Boston and Sydney?

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 $1,816. 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 $1,841.

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 $2,120 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 $1,851 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 December 2025, prices for Boston to Sydney flights are approximately 39% 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

24h 15m

Direct flights

None
The fastest flight from Boston to Sydney takes 24h 15m
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 24h 15m 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 $1,213Free cancellationRating
7.4
9,118 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,461Free cancellationRating
7.5
957 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,475Free cancellationRating
7.2
11,071 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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