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

Delta, Qantas Airways, and United Airlines 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 November 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.

$782 Cheap Flights from Boston to Sydney in 2026/27

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.

20:40 - 18:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 40m1 stop Doha Hamad Intl

22:10 - 14:15SYD Sydney Kingsford Smith-BOS Boston Logan Intl

32h 05m1 stop Doha Hamad Intl

$1,864Multiple Airlines

Wed, 17 Feb - Sat, 27 Feb

20:40 - 18:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 40m1 stop Doha Hamad Intl

22:10 - 14:15SYD Sydney Kingsford Smith-BOS Boston Logan Intl

32h 05m1 stop Doha Hamad Intl

$1,864Multiple Airlines

Mon, 15 Feb - Sat, 27 Feb

20:40 - 18:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 40m1 stop Doha Hamad Intl

22:10 - 14:15SYD Sydney Kingsford Smith-BOS Boston Logan Intl

32h 05m1 stop Doha Hamad Intl

$1,864Multiple Airlines

Fri, 12 Feb - Tue, 23 Feb

21:40 - 18:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 40m1 stop Doha Hamad Intl

20:55 - 15:15SYD Sydney Kingsford Smith-BOS Boston Logan Intl

32h 20m1 stop Doha Hamad Intl

$1,867Qatar Airways

Wed, 24 Mar - Sat, 10 Apr

14:15 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 45m1 stop Los Angeles

07:05 - 18:51SYD Sydney Kingsford Smith-BOS Boston Logan Intl

27h 46m2 stops Auckland Intl Los Angeles

$1,871Qantas Airways

Thu, 11 Feb - Tue, 23 Feb

08:05 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 55m1 stop Los Angeles

14:05 - 20:37SYD Sydney Kingsford Smith-BOS Boston Logan Intl

22h 32m1 stop Dallas/Fort Worth

$1,878Qantas Airways

Tue, 24 Nov - Tue, 1 Dec

08:53 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 07m1 stop Los Angeles

07:05 - 22:00SYD Sydney Kingsford Smith-BOS Boston Logan Intl

30h 55m2 stops Auckland Intl Los Angeles

$1,924Qantas Airways

Wed, 20 Jan - Sun, 31 Jan

11:52 - 06:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 28m2 stops Chicago O'Hare Intl San Francisco

11:20 - 19:38SYD Sydney Kingsford Smith-BOS Boston Logan Intl

24h 18m2 stops Los Angeles Chicago O'Hare Intl

$1,990United Airlines

Sun, 24 Jan - Mon, 8 Mar

09:25 - 07:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 35m1 stop Houston George Bush Intcntl

11:50 - 16:24SYD Sydney Kingsford Smith-BOS Boston Logan Intl

20h 34m1 stop San Francisco

$1,990United Airlines

Mon, 25 Jan - Mon, 1 Mar

13:48 - 06:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 32m1 stop San Francisco

09:15 - 19:11SYD Sydney Kingsford Smith-BOS Boston Logan Intl

25h 56m1 stop Houston George Bush Intcntl

$1,990United Airlines

Wed, 20 Jan - Mon, 1 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

18:45 - 06:25BOS Boston Logan Intl-SYD Sydney Kingsford Smith

43h 40m1 stop Los Angeles

11:10 - 23:59SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 49m1 stop Los Angeles

$1,963Qantas Airways

Sat, 7 Nov - Sat, 21 Nov

09:00 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 00m1 stop Los Angeles

11:20 - 22:00SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 40m1 stop Los Angeles

$1,972Qantas Airways

Sun, 8 Nov - Sat, 6 Feb

09:00 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 00m1 stop Los Angeles

11:20 - 22:00SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 40m1 stop Los Angeles

$1,986Qantas Airways

Sun, 8 Nov - Sat, 6 Feb

05:30 - 09:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

35h 35m2 stops Washington, D.C. Dulles Intl Los Angeles

13:20 - 23:59SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 39m2 stops San Francisco Washington, D.C. Dulles Intl

$1,989United Airlines

Sun, 8 Nov - Sat, 6 Feb

09:00 - 09:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 20m1 stop San Francisco

11:50 - 23:59SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 09m2 stops San Francisco Washington, D.C. Dulles Intl

$1,989United Airlines

Sun, 8 Nov - Sat, 6 Feb

16:20 - 08:30BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 10m1 stop Los Angeles

10:40 - 15:58SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 18m1 stop Los Angeles

$1,989Delta

Sun, 8 Nov - Sat, 6 Feb

10:45 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

30h 15m1 stop Los Angeles

11:10 - 07:47SYD Sydney Kingsford Smith-BOS Boston Logan Intl

36h 37m1 stop Los Angeles

$1,989American Airlines

Mon, 9 Nov - Mon, 16 Nov

17:59 - 09:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

23h 06m1 stop Los Angeles

13:20 - 23:59SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 39m2 stops San Francisco Washington, D.C. Dulles Intl

$1,989United Airlines

Sun, 8 Nov - Sat, 6 Feb

11:15 - 08:30BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 15m2 stops Salt Lake City Los Angeles

10:40 - 23:58SYD Sydney Kingsford Smith-BOS Boston Logan Intl

29h 18m2 stops Los Angeles Salt Lake City

$1,996Delta

Sun, 8 Nov - Sat, 6 Feb

18:45 - 06:25BOS Boston Logan Intl-SYD Sydney Kingsford Smith

43h 40m1 stop Los Angeles

11:10 - 23:59SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 49m1 stop Los Angeles

$2,003Qantas Airways

Sat, 7 Nov - Sat, 21 Nov

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Delta flights from Boston to Sydney

Our best Delta deals on Boston to Sydney flight tickets

Delta

17 Nov

BOS11:35Boston Logan Intl

28h 55m

1 stop

SYD08:30Sydney Kingsford Smith

22 Dec

SYD13:35Sydney Kingsford Smith

21h 45m

1 stop

BOS19:20Boston Logan Intl

$1,917

Delta

10 Nov

BOS13:00Boston Logan Intl

27h 30m

2 stops

SYD08:30Sydney Kingsford Smith

17 Nov

SYD10:40Sydney Kingsford Smith

23h 47m

2 stops

BOS18:27Boston Logan Intl

$1,924

Delta

8 Nov

BOS16:20Boston Logan Intl

24h 10m

1 stop

SYD08:30Sydney Kingsford Smith

6 Feb

SYD10:40Sydney Kingsford Smith

21h 18m

1 stop

BOS15:58Boston Logan Intl

$1,989

American Airlines flights from Boston to Sydney

Our best American Airlines deals on Boston to Sydney flight tickets

American Airlines

24 Nov

BOS15:27Boston Logan Intl

25h 33m

2 stops

SYD09:00Sydney Kingsford Smith

1 Dec

SYD11:15Sydney Kingsford Smith

23h 30m

2 stops

BOS18:45Boston Logan Intl

$1,919

American Airlines

18 Nov

BOS10:45Boston Logan Intl

30h 15m

1 stop

SYD09:00Sydney Kingsford Smith

28 Nov

SYD11:15Sydney Kingsford Smith

21h 10m

1 stop

BOS16:25Boston Logan Intl

$1,983

American Airlines

15 Nov

BOS09:00Boston Logan Intl

29h 25m

1 stop

SYD06:25Sydney Kingsford Smith

29 Nov

SYD14:05Sydney Kingsford Smith

22h 55m

1 stop

BOS21:00Boston Logan Intl

$2,027

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 17/2

20:40-18:20

1 stop29h 40m

Sydney Kingsford Smith

Sat 27/2

22:10-14:15

1 stop32h 05m

$1,864

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 15/2

20:40-18:20

1 stop29h 40m

Sydney Kingsford Smith

Sat 27/2

22:10-14:15

1 stop32h 05m

$1,864

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Fri 12/2

20:40-18:20

1 stop29h 40m

Sydney Kingsford Smith

Tue 23/2

22:10-14:15

1 stop32h 05m

$1,864

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 24/3

21:40-18:20

1 stop29h 40m

Sydney Kingsford Smith

Sat 10/4

20:55-15:15

1 stop32h 20m

$1,867

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Thu 11/2

14:15-09:00

1 stop26h 45m

Sydney Kingsford Smith

Tue 23/2

07:05-18:51

2 stops27h 46m

$1,871

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 24/11

08:05-09:00

1 stop32h 55m

Sydney Kingsford Smith

Tue 1/12

14:05-20:37

1 stop22h 32m

$1,878

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 20/1

08:53-09:00

1 stop32h 07m

Sydney Kingsford Smith

Sun 31/1

07:05-22:00

2 stops30h 55m

$1,924

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 24/1

11:52-06:20

2 stops26h 28m

Sydney Kingsford Smith

Mon 8/3

11:20-19:38

2 stops24h 18m

$1,990

Fastest return journey

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 25/1

09:25-07:00

1 stop29h 35m

Sydney Kingsford Smith

Mon 1/3

11:50-16:24

1 stop20h 34m

$1,990

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 20/1

13:48-06:20

1 stop24h 32m

Sydney Kingsford Smith

Mon 1/3

09:15-19:11

1 stop25h 56m

$1,990

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 $1,911 to $2,275.
The lowest price recently found on this route was $1,864.

What is the cheapest month to fly to Sydney?

The month of May is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,805. If you aren’t able to travel to Sydney during the month of May, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,810.

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 $2,023 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 $1,923 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 7% 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 November 2026, prices for Boston to Sydney flights are approximately 4% more expensive 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

Best price found	$782
Fastest flight time	22h 51m
Direct flights	None

The best one-way flight to Sydney from Boston in the past 72 hours is $782. The best return flight deal from Boston to Sydney found on momondo in the last 72 hours is $1,864.

The fastest flight from Boston to Sydney takes 22h 51m

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 22h 51m 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 November 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 60% of the total bookings. Other popular airlines include United Airlines with 40%.

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 $1,662	Free cancellation	Rating 7.5 1,122 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,770	Free cancellation	Rating 7.3 10,458 reviews		Search United Airlines flights

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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.