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

United Airlines, Qantas Airways, and American 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 June 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.

$808 Cheap Flights from Boston to Sydney in 2026

Q: 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 $2,015 to $2,541. The lowest price recently found on this route was $1,706.

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.

14:00 - 06:55

BOS

SYD

26h 55m

1 stop

10:20 - 17:07

SYD

BOS

20h 47m

1 stop

$1,706United Airlines

Wed, 12 Aug - Mon, 24 Aug

10:30 - 07:30

BOS

SYD

31h 00m

1 stop

09:10 - 23:44

SYD

BOS

28h 34m

1 stop

$1,714American Airlines

Wed, 12 Aug - Mon, 24 Aug

11:54 - 07:00

BOS

SYD

29h 06m

1 stop

09:30 - 21:02

SYD

BOS

25h 32m

2 stops

$1,718United Airlines

Wed, 12 Aug - Mon, 24 Aug

15:53 - 07:30

BOS

SYD

25h 37m

2 stops

09:10 - 19:42

SYD

BOS

24h 32m

2 stops

$1,719American Airlines

Wed, 12 Aug - Mon, 24 Aug

06:21 - 07:00

BOS

SYD

34h 39m

1 stop

09:30 - 21:59

SYD

BOS

26h 29m

2 stops

$1,735United Airlines

Mon, 3 Aug - Sun, 16 Aug

17:01 - 06:55

BOS

SYD

47h 54m

2 stops

09:30 - 21:59

SYD

BOS

26h 29m

2 stops

$1,743United Airlines

Sat, 15 Aug - Sun, 30 Aug

17:01 - 06:55

BOS

SYD

47h 54m

2 stops

09:30 - 17:20

SYD

BOS

21h 50m

1 stop

$1,744United Airlines

Sat, 15 Aug - Sun, 30 Aug

17:01 - 06:55

BOS

SYD

47h 54m

2 stops

09:30 - 17:20

SYD

BOS

21h 50m

1 stop

$1,745United Airlines

Sat, 15 Aug - Sun, 30 Aug

17:33 - 07:30

BOS

SYD

23h 57m

1 stop

09:10 - 23:44

SYD

BOS

28h 34m

1 stop

$1,774American Airlines

Thu, 30 Jul - Tue, 11 Aug

21:05 - 06:50

BOS

SYD

41h 45m

1 stop

15:50 - 13:55

SYD

BOS

38h 05m

1 stop

$1,777Multiple Airlines

Sun, 1 Nov - Tue, 17 Nov

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United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

12 Aug

BOS14:00Boston Logan Intl

26h 55m

1 stop

SYD06:55Sydney Kingsford Smith

24 Aug

SYD10:20Sydney Kingsford Smith

20h 47m

1 stop

BOS17:07Boston Logan Intl

$1,706

United Airlines

12 Aug

BOS11:54Boston Logan Intl

29h 06m

1 stop

SYD07:00Sydney Kingsford Smith

24 Aug

SYD09:30Sydney Kingsford Smith

25h 32m

2 stops

BOS21:02Boston Logan Intl

$1,718

United Airlines

27 June

BOS20:32Boston Logan Intl

44h 23m

1 stop

SYD06:55Sydney Kingsford Smith

7 July

SYD10:20Sydney Kingsford Smith

28h 51m

1 stop

BOS01:11Boston Logan Intl

$1,734

ANA flights from Boston to Sydney

Our best ANA deals on Boston to Sydney flight tickets

ANA

8 July

BOS07:19Boston Logan Intl

45h 51m

2 stops

SYD19:10Sydney Kingsford Smith

20 July

SYD20:55Sydney Kingsford Smith

39h 01m

2 stops

BOS21:56Boston Logan Intl

$1,900

ANA

28 June

BOS07:19Boston Logan Intl

36h 06m

2 stops

SYD09:25Sydney Kingsford Smith

7 July

SYD20:55Sydney Kingsford Smith

39h 01m

2 stops

BOS21:56Boston Logan Intl

$1,903

ANA

8 July

BOS08:15Boston Logan Intl

44h 55m

2 stops

SYD19:10Sydney Kingsford Smith

20 July

SYD11:45Sydney Kingsford Smith

40h 22m

2 stops

BOS14:07Boston Logan Intl

$1,938

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 12/8

14:00-06:55

1 stop26h 55m

Sydney Kingsford Smith

Mon 24/8

10:20-17:07

1 stop20h 47m

$1,706

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 12/8

10:30-07:30

1 stop31h 00m

Sydney Kingsford Smith

Mon 24/8

09:10-23:44

1 stop28h 34m

$1,714

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 12/8

11:54-07:00

1 stop29h 06m

Sydney Kingsford Smith

Mon 24/8

09:30-21:02

2 stops25h 32m

$1,718

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 12/8

15:53-07:30

2 stops25h 37m

Sydney Kingsford Smith

Mon 24/8

09:10-19:42

2 stops24h 32m

$1,719

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 3/8

06:21-07:00

1 stop34h 39m

Sydney Kingsford Smith

Sun 16/8

09:30-21:59

2 stops26h 29m

$1,735

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

17:01-06:55

2 stops47h 54m

Sydney Kingsford Smith

Sun 30/8

09:30-21:59

2 stops26h 29m

$1,743

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

17:01-06:55

2 stops47h 54m

Sydney Kingsford Smith

Sun 30/8

09:30-17:20

1 stop21h 50m

$1,744

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

17:01-06:55

2 stops47h 54m

Sydney Kingsford Smith

Sun 30/8

09:30-17:20

1 stop21h 50m

$1,745

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 30/7

17:33-07:30

1 stop23h 57m

Sydney Kingsford Smith

Tue 11/8

09:10-23:44

1 stop28h 34m

$1,774

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 1/11

21:05-06:50

1 stop41h 45m

Sydney Kingsford Smith

Tue 17/11

15:50-13:55

1 stop38h 05m

$1,777

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?

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 $1,767. 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 $1,880.

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 $2,132 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 $2,019 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 June 2026, prices for Boston to Sydney flights are approximately 43% 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	22h 34m
Direct flights	None

The fastest flight from Boston to Sydney takes 22h 34m

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

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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 34m 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 June 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 62% of the total bookings. Other popular airlines include United Airlines with 38%.

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 $1,653	Free cancellation	Rating 7.5 1,050 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,687	Free cancellation	Rating 7.4 9,893 reviews		Search United Airlines flights

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Katoomba

Manly

Coogee

Leura

Lithgow

Bondi Beach

Cronulla

Randwick

Charlestown

Newport

Swansea

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.