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

United Airlines is the most popular carrier 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 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.

$776 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.

05:30 - 09:35BOS Boston Logan Intl-SYD Sydney Kingsford Smith

36h 05m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

11:20 - 09:48SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 28m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,846Air New Zealand

Thu, 19 Nov - Thu, 26 Nov

05:30 - 09:35BOS Boston Logan Intl-SYD Sydney Kingsford Smith

36h 05m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Island Vancouver Intl

11:20 - 09:48SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 28m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,848Air Canada

Wed, 11 Nov - Wed, 25 Nov

05:30 - 09:35BOS Boston Logan Intl-SYD Sydney Kingsford Smith

36h 05m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Island Vancouver Intl

11:20 - 21:28SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 08m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,848Air Canada

Wed, 11 Nov - Mon, 23 Nov

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

24h 00m1 stop Los Angeles

11:10 - 21:20SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 10m1 stop Los Angeles

$1,849Qantas Airways

Wed, 11 Nov - Sat, 21 Nov

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

$1,849Qatar Airways

Wed, 24 Mar - Sat, 10 Apr

10:00 - 06:25BOS Boston Logan Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Los Angeles

11:20 - 16:17SYD Sydney Kingsford Smith-BOS Boston Logan Intl

20h 57m1 stop Los Angeles

$1,868Qantas Airways

Sun, 21 Feb - Sun, 7 Mar

10:00 - 06:25BOS Boston Logan Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Los Angeles

11:20 - 16:17SYD Sydney Kingsford Smith-BOS Boston Logan Intl

20h 57m1 stop Los Angeles

$1,871Qantas Airways

Sun, 21 Feb - Sun, 7 Mar

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

24h 32m1 stop San Francisco

09:20 - 14:21SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 01m1 stop Houston George Bush Intcntl

$1,875United Airlines

Sun, 24 Jan - Sat, 6 Mar

18:01 - 09:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

23h 19m1 stop San Francisco

11:50 - 18:59SYD Sydney Kingsford Smith-BOS Boston Logan Intl

23h 09m2 stops San Francisco Washington, D.C. Dulles Intl

$1,875United Airlines

Mon, 25 Jan - Thu, 4 Mar

13:24 - 06:20BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 56m2 stops Chicago O'Hare Intl San Francisco

09:15 - 14:21SYD Sydney Kingsford Smith-BOS Boston Logan Intl

21h 06m1 stop Houston George Bush Intcntl

$1,875United Airlines

Sun, 24 Jan - Fri, 5 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

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

23h 20m1 stop Los Angeles

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

21h 19m1 stop Los Angeles

$1,848Qantas Airways

Fri, 23 Oct - Tue, 10 Nov

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

23h 20m1 stop Los Angeles

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

21h 19m1 stop Los Angeles

$1,848Qantas Airways

Fri, 23 Oct - Mon, 2 Nov

17:45 - 09:00BOS Boston Logan Intl-SYD Sydney Kingsford Smith

24h 15m1 stop Los Angeles

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

21h 19m1 stop Los Angeles

$1,848Qantas Airways

Sat, 24 Oct - Tue, 10 Nov

05:30 - 08:35BOS Boston Logan Intl-SYD Sydney Kingsford Smith

36h 05m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Vancouver Intl

11:20 - 09:48SYD Sydney Kingsford Smith-BOS Boston Logan Intl

38h 28m3 stops Vancouver Intl Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$1,852Air Canada

Mon, 26 Oct - Wed, 4 Nov

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

27h 35m1 stop Los Angeles

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

21h 19m1 stop Los Angeles

$1,863Qantas Airways

Mon, 26 Oct - Wed, 4 Nov

05:30 - 08:35BOS Boston Logan Intl-SYD Sydney Kingsford Smith

36h 05m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

11:20 - 21:28SYD Sydney Kingsford Smith-BOS Boston Logan Intl

26h 08m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$1,866Air Canada

Sun, 25 Oct - Thu, 5 Nov

10:10 - 06:55BOS Boston Logan Intl-SYD Sydney Kingsford Smith

29h 45m1 stop Dallas/Fort Worth

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

28h 49m1 stop Los Angeles

$1,879American Airlines

Sun, 25 Oct - Thu, 5 Nov

14:45 - 08:40BOS Boston Logan Intl-SYD Sydney Kingsford Smith

26h 55m1 stop Los Angeles

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

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

$1,885United Airlines

Sat, 24 Oct - Tue, 3 Nov

08:05 - 07:55BOS Boston Logan Intl-SYD Sydney Kingsford Smith

32h 50m2 stops Chicago O'Hare Intl San Francisco

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

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

$1,885United Airlines

Fri, 23 Oct - Tue, 10 Nov

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

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

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

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

$1,885United Airlines

Fri, 23 Oct - Mon, 2 Nov

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Qatar Airways flights from Boston to Sydney

Our best Qatar Airways deals on Boston to Sydney flight tickets

Qatar Airways

24 Mar

BOS21:40Boston Logan Intl

29h 40m

1 stop

SYD18:20Sydney Kingsford Smith

10 Apr

SYD20:55Sydney Kingsford Smith

32h 20m

1 stop

BOS15:15Boston Logan Intl

$1,849

Qatar Airways

25 Jan

BOS20:40Boston Logan Intl

30h 40m

1 stop

SYD19:20Sydney Kingsford Smith

28 Feb

SYD15:50Sydney Kingsford Smith

38h 05m

1 stop

BOS13:55Boston Logan Intl

$1,855

Qatar Airways

21 Feb

BOS20:40Boston Logan Intl

29h 40m

1 stop

SYD18:20Sydney Kingsford Smith

7 Mar

SYD15:50Sydney Kingsford Smith

38h 05m

1 stop

BOS13:55Boston Logan Intl

$1,863

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

24 Jan

BOS13:24Boston Logan Intl

24h 56m

2 stops

SYD06:20Sydney Kingsford Smith

6 Mar

SYD11:20Sydney Kingsford Smith

21h 22m

1 stop

BOS16:42Boston Logan Intl

$1,875

United Airlines

21 Feb

BOS13:31Boston Logan Intl

25h 29m

2 stops

SYD07:00Sydney Kingsford Smith

7 Mar

SYD11:20Sydney Kingsford Smith

21h 22m

1 stop

BOS16:42Boston Logan Intl

$1,878

United Airlines

11 Nov

BOS09:00Boston Logan Intl

32h 20m

1 stop

SYD09:20Sydney Kingsford Smith

21 Nov

SYD11:50Sydney Kingsford Smith

28h 09m

2 stops

BOS23:59Boston Logan Intl

$1,883

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Thu 19/11

05:30-09:35

2 stops36h 05m

Sydney Kingsford Smith

Thu 26/11

11:20-09:48

2 stops38h 28m

$1,846

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 11/11

05:30-09:35

3 stops36h 05m

Sydney Kingsford Smith

Wed 25/11

11:20-09:48

2 stops38h 28m

$1,848

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 11/11

05:30-09:35

3 stops36h 05m

Sydney Kingsford Smith

Mon 23/11

11:20-21:28

2 stops26h 08m

$1,848

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Wed 11/11

14:25-06:25

1 stop24h 00m

Sydney Kingsford Smith

Sat 21/11

11:10-21:20

1 stop26h 10m

$1,849

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

$1,849

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 21/2

10:00-06:25

1 stop28h 25m

Sydney Kingsford Smith

Sun 7/3

11:20-16:17

1 stop20h 57m

$1,868

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 21/2

10:00-06:25

1 stop28h 25m

Sydney Kingsford Smith

Sun 7/3

11:20-16:17

1 stop20h 57m

$1,870

Fastest return journey

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 24/1

13:48-06:20

1 stop24h 32m

Sydney Kingsford Smith

Sat 6/3

09:20-14:21

1 stop21h 01m

$1,875

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Mon 25/1

18:01-09:20

1 stop23h 19m

Sydney Kingsford Smith

Thu 4/3

11:50-18:59

2 stops23h 09m

$1,875

BostonSydney

BOS Boston Logan Intl - SYD Sydney Kingsford Smith

BOSSYD

Boston Logan Intl

Sun 24/1

13:24-06:20

2 stops24h 56m

Sydney Kingsford Smith

Fri 5/3

09:15-14:21

1 stop21h 06m

$1,875

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 $1,871 to $2,246.
The lowest price recently found on this route was $1,846.

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 $1,740. 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 $1,798.

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 $2,025 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 $1,876 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 36% 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	$776
Fastest flight time	26h 05m
Direct flights	None

The best one-way flight to Sydney from Boston in the past 72 hours is $776. The best return flight deal from Boston to Sydney found on momondo in the last 72 hours is $1,846.

The fastest flight from Boston to Sydney takes 26h 05m

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 26h 05m 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 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 58% of the total bookings. Other popular airlines include United Airlines with 42%.

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 $1,625	Free cancellation	Rating 7.5 1,115 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,758	Free cancellation	Rating 7.3 10,406 reviews		Search United Airlines flights

Parramatta

Terrigal

Wollongong

Katoomba

Penrith

Lithgow

Coogee

Manly

Cronulla

Randwick

Leura

Bondi Beach

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.