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

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

Which airlines fly to Sydney?

Qantas Airways, United Airlines and American Airlines are the top three most popular airlines that fly to Sydney from Boston according to our data. Qantas Airways is the first choice among our users, with 40% of people opting to fly with this airline when travelling to Sydney. Keep in mind that there are 3 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

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 3 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of October 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.

$783 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.

09:15 - 09:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 05m1 stop San Francisco

11:50 - 23:54SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 04m2 stops San Francisco Washington, D.C. Dulles Intl

$1,860United Airlines

Mon, 1 Feb - Wed, 3 Mar

13:32 - 09:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

27h 48m2 stops Houston George Bush Intcntl San Francisco

09:15 - 16:45SYD Sydney Kingsford Smith-BOS Boston Logan Intl

23h 30m1 stop Houston George Bush Intcntl

$1,860United Airlines

Wed, 25 Nov - Wed, 16 Dec

12:55 - 08:30BOS Boston Logan Intl-SYD Sydney Kingsford Smith

27h 35m1 stop Los Angeles

10:40 - 21:41SYD Sydney Kingsford Smith-BOS Boston Logan Intl

27h 01m1 stop Los Angeles

$1,860Delta

Wed, 17 Feb - Mon, 1 Mar

13:32 - 09:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

27h 48m2 stops Houston George Bush Intcntl San Francisco

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

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

$1,860United Airlines

Tue, 17 Nov - Tue, 22 Dec

14:20 - 06:25BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 05m1 stop Los Angeles

11:10 - 19:07SYD Sydney Kingsford Smith-BOS Boston Logan Intl

23h 57m2 stops Los Angeles Charlotte Douglas

$1,861American Airlines

Tue, 24 Nov - Mon, 7 Dec

08:49 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 11m1 stop Los Angeles

14:05 - 20:53SYD Sydney Kingsford Smith-BOS Boston Logan Intl

22h 48m2 stops Dallas/Fort Worth New York LaGuardia

$1,861American Airlines

Tue, 9 Feb - Tue, 23 Feb

07:45 - 08:30BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 45m1 stop Los Angeles

10:40 - 21:41SYD Sydney Kingsford Smith-BOS Boston Logan Intl

27h 01m1 stop Los Angeles

$1,861Delta

Mon, 1 Feb - Wed, 3 Mar

20:40 - 19:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

30h 40m1 stop Doha Hamad Intl

15:50 - 14:15SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 25m1 stop Doha Hamad Intl

$1,863Qatar Airways

Mon, 8 Feb - Thu, 25 Feb

14:25 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 35m1 stop Los Angeles

11:10 - 16:25SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 15m1 stop Los Angeles

$1,874Qantas Airways

Fri, 6 Nov - Sat, 21 Nov

12:49 - 06:55BOS Boston Logan Intl-SYD Sydney Kingsford Smith

27h 06m1 stop Dallas/Fort Worth

11:10 - 16:29SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 19m1 stop Los Angeles

$1,879Qantas Airways

Fri, 30 Oct - Fri, 6 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

19:45 - 08:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

45h 20m1 stop Los Angeles

11:10 - 20:57SYD Sydney Kingsford Smith-BOS Boston Logan Intl

24h 47m1 stop Los Angeles

$1,870Qantas Airways

Sat, 17 Oct - Sat, 31 Oct

19:45 - 08:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

45h 20m1 stop Los Angeles

13:05 - 19:37SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 32m1 stop Dallas/Fort Worth

$1,871Qantas Airways

Sat, 17 Oct - Sat, 31 Oct

11:00 - 07:30BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 30m1 stop Los Angeles

11:10 - 23:52SYD Sydney Kingsford Smith-BOS Boston Logan Intl

27h 42m1 stop Los Angeles

$1,912American Airlines

Sat, 17 Oct - Sat, 31 Oct

19:45 - 07:30BOS Boston Logan Intl-SYD Sydney Kingsford Smith

44h 45m1 stop Los Angeles

13:05 - 19:37SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 32m1 stop Dallas/Fort Worth

$1,914Qantas Airways

Sat, 17 Oct - Sat, 31 Oct

14:45 - 08:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 15m1 stop Los Angeles

09:10 - 00:46SYD Sydney Kingsford Smith-BOS Boston Logan Intl

30h 36m2 stops Houston George Bush Intcntl Chicago O'Hare Intl

$1,917United Airlines

Sat, 17 Oct - Sat, 31 Oct

05:45 - 08:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

35h 15m2 stops Washington, D.C. Dulles Intl Los Angeles

09:10 - 00:46SYD Sydney Kingsford Smith-BOS Boston Logan Intl

30h 36m2 stops Houston George Bush Intcntl Chicago O'Hare Intl

$1,917United Airlines

Sat, 17 Oct - Sat, 31 Oct

11:30 - 07:50BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 20m1 stop Los Angeles

09:40 - 20:30SYD Sydney Kingsford Smith-BOS Boston Logan Intl

25h 50m1 stop Los Angeles

$1,917Delta

Sat, 17 Oct - Sat, 31 Oct

11:30 - 07:55BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 25m1 stop San Francisco

10:30 - 17:31SYD Sydney Kingsford Smith-BOS Boston Logan Intl

22h 01m1 stop Los Angeles

$1,917United Airlines

Fri, 16 Oct - Fri, 23 Oct

13:05 - 07:50BOS Boston Logan Intl-SYD Sydney Kingsford Smith

27h 45m2 stops Detroit Metropolitan Wayne County Los Angeles

09:40 - 08:28SYD Sydney Kingsford Smith-BOS Boston Logan Intl

37h 48m2 stops Los Angeles New York John F Kennedy Intl

$1,924Delta

Sat, 17 Oct - Sat, 31 Oct

11:30 - 07:50BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 20m1 stop Los Angeles

09:40 - 18:58SYD Sydney Kingsford Smith-BOS Boston Logan Intl

24h 18m2 stops Los Angeles Minneapolis St Paul

$1,924Delta

Sat, 17 Oct - Sat, 31 Oct

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United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

17 Nov

BOS05:30Boston Logan Intl

35h 35m

2 stops

SYD09:05Sydney Kingsford Smith

2 Dec

SYD11:50Sydney Kingsford Smith

28h 09m

2 stops

BOS23:59Boston Logan Intl

$1,860

United Airlines

6 Dec

BOS15:42Boston Logan Intl

25h 23m

2 stops

SYD09:05Sydney Kingsford Smith

3 Feb

SYD09:20Sydney Kingsford Smith

24h 07m

2 stops

BOS17:27Boston Logan Intl

$1,866

United Airlines

5 Dec

BOS18:01Boston Logan Intl

44h 19m

1 stop

SYD06:20Sydney Kingsford Smith

22 Dec

SYD11:50Sydney Kingsford Smith

28h 09m

2 stops

BOS23:59Boston Logan Intl

$1,877

American Airlines flights from Boston to Sydney

Our best American Airlines deals on Boston to Sydney flight tickets

American Airlines

24 Nov

BOS15:15Boston Logan Intl

25h 45m

2 stops

SYD09:00Sydney Kingsford Smith

7 Dec

SYD14:05Sydney Kingsford Smith

23h 46m

2 stops

BOS21:51Boston Logan Intl

$1,861

American Airlines

5 Nov

BOS14:25Boston Logan Intl

24h 00m

1 stop

SYD06:25Sydney Kingsford Smith

12 Nov

SYD11:10Sydney Kingsford Smith

28h 49m

1 stop

BOS23:59Boston Logan Intl

$1,906

American Airlines

17 Oct

BOS11:00Boston Logan Intl

29h 30m

1 stop

SYD07:30Sydney Kingsford Smith

31 Oct

SYD11:10Sydney Kingsford Smith

27h 42m

1 stop

BOS23:52Boston Logan Intl

$1,912

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 1/2

09:15-09:20

1 stop32h 05m

Sydney Kingsford Smith

Wed 3/3

11:50-23:54

2 stops28h 04m

$1,860

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 25/11

13:32-09:20

2 stops27h 48m

Sydney Kingsford Smith

Wed 16/12

09:15-16:45

1 stop23h 30m

$1,860

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 17/2

12:55-08:30

1 stop27h 35m

Sydney Kingsford Smith

Mon 1/3

10:40-21:41

1 stop27h 01m

$1,860

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 17/11

13:32-09:20

2 stops27h 48m

Sydney Kingsford Smith

Tue 22/12

13:20-23:59

2 stops26h 39m

$1,860

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 24/11

14:20-06:25

1 stop24h 05m

Sydney Kingsford Smith

Mon 7/12

11:10-19:07

2 stops23h 57m

$1,861

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 9/2

08:49-09:00

1 stop32h 11m

Sydney Kingsford Smith

Tue 23/2

14:05-20:53

2 stops22h 48m

$1,861

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 1/2

07:45-08:30

1 stop32h 45m

Sydney Kingsford Smith

Wed 3/3

10:40-21:41

1 stop27h 01m

$1,861

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 8/2

20:40-19:20

1 stop30h 40m

Sydney Kingsford Smith

Thu 25/2

15:50-14:15

1 stop38h 25m

$1,863

Fastest return journey

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Fri 6/11

14:25-09:00

1 stop26h 35m

Sydney Kingsford Smith

Sat 21/11

11:10-16:25

1 stop21h 15m

$1,874

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Fri 30/10

12:49-06:55

1 stop27h 06m

Sydney Kingsford Smith

Fri 6/11

11:10-16:29

1 stop21h 19m

$1,879

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 $1,893 to $2,603.
The lowest price recently found on this route was $1,860.

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 $1,807. 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 $1,811.

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 $2,056 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 $1,890 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 21% 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 October 2026, prices for Boston to Sydney flights are approximately 49% 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

Best price found	$783
Fastest flight time	23h 19m
Direct flights	None

The best one-way flight to Sydney from Boston in the past 72 hours is $783. The best return flight deal from Boston to Sydney found on momondo in the last 72 hours is $1,860.

The fastest flight from Boston to Sydney takes 23h 19m

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 19m 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 3 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of October 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 40% of the total bookings. Other popular airlines include United Airlines with 33% and American Airlines with 28%.

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
American Airlines	PriceFrom $1,522	Free cancellation	Rating 7.0 12,167 reviews	Search American Airlines flights
Qantas Airways	PriceFrom $1,637	Free cancellation	Rating 7.5 1,109 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,771	Free cancellation	Rating 7.4 10,362 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.