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

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

Which airlines fly to Sydney?

Qantas Airways, American Airlines and United 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 38% 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 September 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.

$919 Cheap Flights from Boston to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Boston to Sydney

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One-way

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Cheap return flights

Enter your travel dates to find the best prices.

10:40 - 08:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

30h 40m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

11:20 - 10:03SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 43m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,474Air Canada

Sun, 18 Oct - Mon, 2 Nov

10:40 - 08:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

30h 40m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

11:20 - 10:03SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 43m3 stops Vancouver Intl Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$1,485Air Canada

Sun, 18 Oct - Mon, 2 Nov

15:30 - 09:35BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 05m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

11:20 - 21:25SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 05m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,516Air Canada

Mon, 1 Feb - Wed, 3 Mar

14:21 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 39m1 stop Los Angeles

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

30h 55m2 stops Auckland Intl Los Angeles

$1,584Qantas Airways

Tue, 2 Feb - Wed, 17 Feb

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

30h 15m1 stop Los Angeles

07:05 - 21:40SYD Sydney Kingsford Smith-BOS Boston Logan Intl

30h 35m2 stops Auckland Intl Los Angeles

$1,652Qantas Airways

Sun, 8 Nov - Sat, 6 Feb

08:40 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 20m1 stop Los Angeles

07:05 - 21:40SYD Sydney Kingsford Smith-BOS Boston Logan Intl

30h 35m2 stops Auckland Intl Los Angeles

$1,653Qantas Airways

Sun, 24 Jan - Sun, 7 Feb

17:45 - 08:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Los Angeles

11:10 - 19:33SYD Sydney Kingsford Smith-BOS Boston Logan Intl

24h 23m2 stops Los Angeles Dallas/Fort Worth

$1,729American Airlines

Sun, 18 Oct - Mon, 2 Nov

07:00 - 08:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

11:15 - 16:29SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 14m1 stop Los Angeles

$1,729American Airlines

Sun, 18 Oct - Mon, 2 Nov

18:40 - 08:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

22h 20m1 stop Los Angeles

11:20 - 00:46SYD Sydney Kingsford Smith-BOS Boston Logan Intl

29h 26m3 stops Los Angeles Houston George Bush Intcntl Chicago O'Hare Intl

$1,805United Airlines

Sun, 18 Oct - Mon, 2 Nov

05:45 - 09:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

35h 20m2 stops Washington, D.C. Dulles Intl Los Angeles

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

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

$1,815United Airlines

Sun, 31 Jan - Mon, 22 Feb

Cheap last-minute flights

Enter your travel dates to find the best prices.

18:55 - 07:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

46h 25m2 stops Toronto Pearson Intl Vancouver Intl

09:20 - 09:50SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 30m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,919Air Canada

Fri, 11 Sep - Sun, 27 Sep

18:55 - 07:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

46h 25m2 stops Toronto Pearson Intl Vancouver Intl

09:20 - 09:50SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 30m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,920Air Canada

Fri, 11 Sep - Sun, 27 Sep

10:40 - 07:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

30h 40m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

09:20 - 09:50SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 30m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,920Air Canada

Tue, 15 Sep - Tue, 29 Sep

18:55 - 07:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

46h 25m2 stops Toronto Pearson Intl Vancouver Intl

09:20 - 09:50SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 30m3 stops Vancouver Intl Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$1,931Air Canada

Fri, 11 Sep - Sun, 27 Sep

16:35 - 07:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 30m1 stop Los Angeles

08:55 - 23:28SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 33m2 stops Auckland Intl New York John F Kennedy Intl

$2,508Qantas Airways

Tue, 15 Sep - Tue, 29 Sep

16:35 - 07:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 30m1 stop Los Angeles

09:10 - 23:28SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 18m1 stop Los Angeles

$2,973Qantas Airways

Sat, 12 Sep - Mon, 14 Sep

16:35 - 07:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 30m1 stop Los Angeles

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

24h 47m1 stop Los Angeles

$5,243Qantas Airways

Mon, 14 Sep - Mon, 26 Oct

16:35 - 07:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 30m1 stop Los Angeles

10:10 - 23:43SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 33m1 stop Los Angeles

$13,261Qantas Airways

Tue, 15 Sep - Thu, 8 Oct

12:59 - 07:05BOS Boston Logan Intl-SYD Sydney Kingsford Smith

28h 06m2 stops Dallas/Fort Worth Los Angeles

10:10 - 23:43SYD Sydney Kingsford Smith-BOS Boston Logan Intl

28h 33m1 stop Los Angeles

$13,267Qantas Airways

Tue, 15 Sep - Thu, 8 Oct

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Air New Zealand flights from Boston to Sydney

Our best Air New Zealand deals on Boston to Sydney flight tickets

Air New Zealand

1 Feb

BOS15:30Boston Logan Intl

26h 05m

2 stops

SYD09:35Sydney Kingsford Smith

24 Feb

SYD11:20Sydney Kingsford Smith

26h 08m

2 stops

BOS21:28Boston Logan Intl

$1,657

Air New Zealand

2 Feb

BOS11:05Boston Logan Intl

30h 30m

1 stop

SYD09:35Sydney Kingsford Smith

22 Feb

SYD11:20Sydney Kingsford Smith

26h 08m

2 stops

BOS21:28Boston Logan Intl

$1,663

Air New Zealand

3 Nov

BOS15:30Boston Logan Intl

26h 05m

2 stops

SYD09:35Sydney Kingsford Smith

17 Nov

SYD11:20Sydney Kingsford Smith

27h 17m

1 stop

BOS22:37Boston Logan Intl

$1,664

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets

Air Canada

18 Oct

BOS10:40Boston Logan Intl

30h 40m

2 stops

SYD08:20Sydney Kingsford Smith

2 Nov

SYD11:20Sydney Kingsford Smith

38h 43m

2 stops

BOS10:03Boston Logan Intl

$1,474

Air Canada

18 Oct

BOS10:40Boston Logan Intl

30h 40m

2 stops

SYD08:20Sydney Kingsford Smith

2 Nov

SYD11:20Sydney Kingsford Smith

38h 43m

3 stops

BOS10:03Boston Logan Intl

$1,485

Air Canada

21 Oct

BOS10:40Boston Logan Intl

30h 40m

2 stops

SYD08:20Sydney Kingsford Smith

28 Oct

SYD10:20Sydney Kingsford Smith

38h 43m

2 stops

BOS10:03Boston Logan Intl

$1,516

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 18/10

10:40-08:20

2 stops30h 40m

Sydney Kingsford Smith

Mon 2/11

11:20-10:03

2 stops38h 43m

$1,474

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 18/10

10:40-08:20

2 stops30h 40m

Sydney Kingsford Smith

Mon 2/11

11:20-10:03

3 stops38h 43m

$1,485

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 1/2

15:30-09:35

2 stops26h 05m

Sydney Kingsford Smith

Wed 3/3

11:20-21:25

2 stops26h 05m

$1,516

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Tue 2/2

14:21-09:00

1 stop26h 39m

Sydney Kingsford Smith

Wed 17/2

07:05-22:00

2 stops30h 55m

$1,584

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 8/11

10:45-09:00

1 stop30h 15m

Sydney Kingsford Smith

Sat 6/2

07:05-21:40

2 stops30h 35m

$1,652

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 24/1

08:40-09:00

1 stop32h 20m

Sydney Kingsford Smith

Sun 7/2

07:05-21:40

2 stops30h 35m

$1,653

Fastest return journey

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 18/10

17:45-08:05

1 stop23h 20m

Sydney Kingsford Smith

Mon 2/11

11:10-19:33

2 stops24h 23m

$1,729

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 18/10

07:00-08:05

1 stop34h 05m

Sydney Kingsford Smith

Mon 2/11

11:15-16:29

1 stop21h 14m

$1,729

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 18/10

18:40-08:00

1 stop22h 20m

Sydney Kingsford Smith

Mon 2/11

11:20-00:46

3 stops29h 26m

$1,805

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 31/1

05:45-09:05

2 stops35h 20m

Sydney Kingsford Smith

Mon 22/2

11:50-23:54

2 stops28h 04m

$1,815

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 $1,690 to $2,031.
The lowest price recently found on this route was $1,474.

What is the cheapest month to fly to Sydney?

The month of March is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,757. If you aren’t able to travel to Sydney during the month of March, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $1,786.

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 $2,029 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 $1,865 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 3% 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 September 2026, prices for Boston to Sydney flights are approximately 40% 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	$919
Fastest flight time	28h 35m
Direct flights	None

The best one-way flight to Sydney from Boston in the past 72 hours is $919. The best return flight deal from Boston to Sydney found on momondo in the last 72 hours is $1,474.

The fastest flight from Boston to Sydney takes 28h 35m

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 28h 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?
There are 3 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of September 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 38% of the total bookings. Other popular airlines include American Airlines with 33% and United 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
Qantas Airways	PriceFrom $1,360	Free cancellation	Rating 7.5 1,091 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $1,470	Free cancellation	Rating 7.1 12,046 reviews	Search American Airlines flights
United Airlines	PriceFrom $1,711	Free cancellation	Rating 7.4 10,190 reviews	Search United Airlines flights

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Randwick

Leura

Charlestown

Bondi Beach

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.