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

Delta 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 May 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.

$860 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 $2,393 to $1,741. The lowest price recently found on this route was $1,469.

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Find the cheapest flights from Boston to Sydney

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

12:00 - 08:00

BOS

SYD

29h 00m

1 stop

19:15 - 19:30

SYD

BOS

40h 15m

2 stops

$1,469Qantas Airways

Sun, 25 Oct - Sat, 7 Nov

18:00 - 07:05

BOS

SYD

23h 05m

1 stop

09:10 - 16:38

SYD

BOS

21h 28m

1 stop

$1,777Qantas Airways

Mon, 25 May - Sun, 5 Jul

18:00 - 07:05

BOS

SYD

23h 05m

1 stop

12:00 - 19:20

SYD

BOS

21h 20m

1 stop

$1,780Qantas Airways

Sun, 31 May - Wed, 10 Jun

15:00 - 07:05

BOS

SYD

26h 05m

1 stop

11:15 - 17:35

SYD

BOS

22h 20m

1 stop

$1,802Qantas Airways

Sun, 9 Aug - Wed, 16 Dec

15:00 - 07:05

BOS

SYD

26h 05m

1 stop

11:15 - 17:35

SYD

BOS

22h 20m

1 stop

$1,803Qantas Airways

Sun, 9 Aug - Wed, 16 Dec

10:55 - 06:50

BOS

SYD

29h 55m

1 stop

09:15 - 19:20

SYD

BOS

24h 05m

1 stop

$1,823Delta

Sun, 17 May - Wed, 3 Jun

16:30 - 06:50

BOS

SYD

24h 20m

1 stop

09:15 - 23:14

SYD

BOS

27h 59m

2 stops

$1,828Delta

Sun, 31 May - Wed, 10 Jun

15:00 - 06:50

BOS

SYD

25h 50m

2 stops

09:15 - 19:25

SYD

BOS

24h 10m

1 stop

$1,830Delta

Mon, 1 Jun - Wed, 10 Jun

13:00 - 07:05

BOS

SYD

28h 05m

1 stop

12:00 - 20:53

SYD

BOS

22h 53m

1 stop

$1,837Qantas Airways

Wed, 20 May - Tue, 30 Jun

10:55 - 06:50

BOS

SYD

29h 55m

1 stop

09:15 - 05:28

SYD

BOS

34h 13m

1 stop

$1,841Delta

Sun, 31 May - Sun, 14 Jun

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets

Qantas Airways

25 Oct

BOS12:00Boston Logan Intl

29h 00m

1 stop

SYD08:00Sydney Kingsford Smith

7 Nov

SYD19:15Sydney Kingsford Smith

40h 15m

2 stops

BOS19:30Boston Logan Intl

$1,469

Qantas Airways

25 May

BOS18:00Boston Logan Intl

23h 05m

1 stop

SYD07:05Sydney Kingsford Smith

5 July

SYD09:10Sydney Kingsford Smith

21h 28m

1 stop

BOS16:38Boston Logan Intl

$1,777

Qantas Airways

31 May

BOS18:00Boston Logan Intl

23h 05m

1 stop

SYD07:05Sydney Kingsford Smith

10 June

SYD12:00Sydney Kingsford Smith

21h 20m

1 stop

BOS19:20Boston Logan Intl

$1,780

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

4 Aug

BOS13:37Boston Logan Intl

27h 18m

2 stops

SYD06:55Sydney Kingsford Smith

25 Aug

SYD09:30Sydney Kingsford Smith

25h 29m

2 stops

BOS20:59Boston Logan Intl

$1,863

United Airlines

16 Aug

BOS05:45Boston Logan Intl

35h 15m

2 stops

SYD07:00Sydney Kingsford Smith

25 Aug

SYD10:20Sydney Kingsford Smith

22h 42m

1 stop

BOS19:02Boston Logan Intl

$1,864

United Airlines

25 May

BOS05:45Boston Logan Intl

35h 15m

2 stops

SYD07:00Sydney Kingsford Smith

5 July

SYD09:30Sydney Kingsford Smith

22h 00m

1 stop

BOS17:30Boston Logan Intl

$1,866

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 25/10

12:00-08:00

1 stop29h 00m

Sydney Kingsford Smith

Sat 7/11

19:15-19:30

2 stops40h 15m

$1,469

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 25/5

18:00-07:05

1 stop23h 05m

Sydney Kingsford Smith

Sun 5/7

09:10-16:38

1 stop21h 28m

$1,777

Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 31/5

18:00-07:05

1 stop23h 05m

Sydney Kingsford Smith

Wed 10/6

12:00-19:20

1 stop21h 20m

$1,780

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/8

15:00-07:05

1 stop26h 05m

Sydney Kingsford Smith

Wed 16/12

11:15-17:35

1 stop22h 20m

$1,802

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/8

15:00-07:05

1 stop26h 05m

Sydney Kingsford Smith

Wed 16/12

11:15-17:35

1 stop22h 20m

$1,803

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 17/5

10:55-06:50

1 stop29h 55m

Sydney Kingsford Smith

Wed 3/6

09:15-19:20

1 stop24h 05m

$1,823

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 31/5

16:30-06:50

1 stop24h 20m

Sydney Kingsford Smith

Wed 10/6

09:15-23:14

2 stops27h 59m

$1,828

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/6

15:00-06:50

2 stops25h 50m

Sydney Kingsford Smith

Wed 10/6

09:15-19:25

1 stop24h 10m

$1,830

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 20/5

13:00-07:05

1 stop28h 05m

Sydney Kingsford Smith

Tue 30/6

12:00-20:53

1 stop22h 53m

$1,837

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 31/5

10:55-06:50

1 stop29h 55m

Sydney Kingsford Smith

Sun 14/6

09:15-05:28

1 stop34h 13m

$1,841

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 $1,693. 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 $1,816.

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 $2,069 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 $1,830 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 32% 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 May 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	23h 01m
Direct flights	None

The fastest flight from Boston to Sydney takes 23h 01m

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 01m 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 May 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 56% of the total bookings. Other popular airlines include United Airlines with 44%.

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 $1,366	Free cancellation	Rating 7.5 1,033 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,620	Free cancellation	Rating 7.4 9,683 reviews		Search United Airlines flights

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Terrigal

Penrith

Katoomba

Lithgow

Manly

Coogee

Leura

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.