What is the cheapest airline that flies from Boston Logan Intl to Sydney Kingsford Smith?

United Airlines and Qantas Airways are the most popular carriers operating from Boston Logan Intl to Sydney Kingsford Smith

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?

There are 2 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of July 2026.

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.

$874 Cheap Flights from Boston to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Boston to Sydney

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

10:30 - 07:30

BOS

SYD

31h 00m

1 stop

12:00 - 22:06

SYD

BOS

24h 06m

1 stop

$1,697American Airlines

Mon, 10 Aug - Mon, 24 Aug

10:40 - 07:20

BOS

SYD

30h 40m

3 stops

09:20 - 09:50

SYD

BOS

38h 30m

3 stops

$1,697Air Canada

Tue, 8 Sep - Wed, 23 Sep

09:19 - 06:55

BOS

SYD

31h 36m

1 stop

09:10 - 23:44

SYD

BOS

28h 34m

1 stop

$1,697American Airlines

Mon, 17 Aug - Mon, 24 Aug

10:30 - 07:30

BOS

SYD

31h 00m

1 stop

17:50 - 07:36

SYD

BOS

27h 46m

1 stop

$1,697American Airlines

Sun, 16 Aug - Sun, 23 Aug

16:35 - 07:05

BOS

SYD

24h 30m

1 stop

09:10 - 23:28

SYD

BOS

28h 18m

1 stop

$1,699Qantas Airways

Wed, 9 Sep - Wed, 16 Sep

10:30 - 07:05

BOS

SYD

30h 35m

1 stop

09:10 - 23:44

SYD

BOS

28h 34m

1 stop

$1,699Qantas Airways

Sun, 23 Aug - Sun, 30 Aug

05:45 - 07:00

BOS

SYD

35h 15m

2 stops

09:30 - 21:02

SYD

BOS

25h 32m

2 stops

$1,702United Airlines

Mon, 17 Aug - Mon, 24 Aug

16:15 - 06:55

BOS

SYD

24h 40m

1 stop

10:20 - 17:07

SYD

BOS

20h 47m

1 stop

$1,702United Airlines

Mon, 10 Aug - Wed, 19 Aug

09:07 - 06:55

BOS

SYD

31h 48m

1 stop

09:30 - 21:02

SYD

BOS

25h 32m

2 stops

$1,702United Airlines

Sun, 9 Aug - Tue, 18 Aug

16:35 - 07:05

BOS

SYD

24h 30m

1 stop

17:50 - 08:13

SYD

BOS

28h 23m

1 stop

$1,706Qantas Airways

Tue, 22 Sep - Tue, 29 Sep

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United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

10 Aug

BOS18:27Boston Logan Intl

22h 33m

1 stop

SYD07:00Sydney Kingsford Smith

17 Aug

SYD10:20Sydney Kingsford Smith

20h 47m

1 stop

BOS17:07Boston Logan Intl

$1,702

United Airlines

9 Aug

BOS15:54Boston Logan Intl

25h 06m

2 stops

SYD07:00Sydney Kingsford Smith

19 Aug

SYD09:30Sydney Kingsford Smith

23h 58m

2 stops

BOS19:28Boston Logan Intl

$1,707

United Airlines

9 Aug

BOS15:54Boston Logan Intl

25h 06m

2 stops

SYD07:00Sydney Kingsford Smith

16 Aug

SYD09:30Sydney Kingsford Smith

23h 40m

2 stops

BOS19:10Boston Logan Intl

$1,709

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets

Qantas Airways

23 Aug

BOS10:30Boston Logan Intl

30h 35m

1 stop

SYD07:05Sydney Kingsford Smith

30 Aug

SYD09:10Sydney Kingsford Smith

28h 34m

1 stop

BOS23:44Boston Logan Intl

$1,699

Qantas Airways

22 Sept

BOS16:35Boston Logan Intl

24h 30m

1 stop

SYD07:05Sydney Kingsford Smith

29 Sept

SYD17:50Sydney Kingsford Smith

28h 23m

1 stop

BOS08:13Boston Logan Intl

$1,706

Qantas Airways

27 Oct

BOS17:45Boston Logan Intl

24h 15m

1 stop

SYD09:00Sydney Kingsford Smith

10 Nov

SYD11:20Sydney Kingsford Smith

21h 09m

1 stop

BOS16:29Boston Logan Intl

$1,736

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 10/8

10:30-07:30

1 stop31h 00m

Sydney Kingsford Smith

Mon 24/8

12:00-22:06

1 stop24h 06m

$1,697

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 8/9

10:40-07:20

3 stops30h 40m

Sydney Kingsford Smith

Wed 23/9

09:20-09:50

3 stops38h 30m

$1,697

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 17/8

09:19-06:55

1 stop31h 36m

Sydney Kingsford Smith

Mon 24/8

09:10-23:44

1 stop28h 34m

$1,697

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 16/8

10:30-07:30

1 stop31h 00m

Sydney Kingsford Smith

Sun 23/8

17:50-07:36

1 stop27h 46m

$1,697

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 9/9

16:35-07:05

1 stop24h 30m

Sydney Kingsford Smith

Wed 16/9

09:10-23:28

1 stop28h 18m

$1,699

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 23/8

10:30-07:05

1 stop30h 35m

Sydney Kingsford Smith

Sun 30/8

09:10-23:44

1 stop28h 34m

$1,699

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 17/8

05:45-07:00

2 stops35h 15m

Sydney Kingsford Smith

Mon 24/8

09:30-21:02

2 stops25h 32m

$1,702

Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 10/8

16:15-06:55

1 stop24h 40m

Sydney Kingsford Smith

Wed 19/8

10:20-17:07

1 stop20h 47m

$1,702

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/8

09:07-06:55

1 stop31h 48m

Sydney Kingsford Smith

Tue 18/8

09:30-21:02

2 stops25h 32m

$1,702

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 22/9

16:35-07:05

1 stop24h 30m

Sydney Kingsford Smith

Tue 29/9

17:50-08:13

1 stop28h 23m

$1,706

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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

Prices are currently low for flights on this route.

Typical prices usually range from $1,813 to $2,339.
The lowest price recently found on this route was $1,697.

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 $1,760. 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 $1,842.

How far in advance should I book a flight from Boston 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 $2,106 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 $1,988 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 27% 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 July 2026, prices for Boston to Sydney flights are approximately 72% 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 20m
Direct flights	None

The fastest flight from Boston to Sydney takes 23h 20m

There are no direct flights from Boston to Sydney. There are no popular flight routes from Boston to Sydney.

Search flight deals

Frequently asked questions about flying from Boston to Sydney

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 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?
There are 2 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of July 2026.
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?
Based on momondo bookings for flights between Boston and Sydney, the leading airline is Qantas Airways, making up 50% of the total bookings. Other popular airlines include United Airlines with 50%.

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
Qantas Airways	PriceFrom $1,407	Free cancellation	Rating 7.5 1,073 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,669	Free cancellation	Rating 7.4 10,052 reviews		Search United Airlines flights

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Cronulla

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Randwick

Charlestown

Swansea

Newport

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.