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

United Airlines, Delta, and Qantas Airways 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 July 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.

$874 Cheap Flights from Boston to Sydney in 2026

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.

10:30 - 07:05

BOS

SYD

30h 35m

1 stop

12:00 - 22:06

SYD

BOS

24h 06m

1 stop

$1,693American Airlines

Wed, 19 Aug - Wed, 26 Aug

15:19 - 06:55

BOS

SYD

25h 36m

2 stops

09:10 - 20:13

SYD

BOS

25h 03m

2 stops

$1,694American Airlines

Sun, 2 Aug - Tue, 18 Aug

10:30 - 07:05

BOS

SYD

30h 35m

1 stop

12:00 - 21:05

SYD

BOS

23h 05m

1 stop

$1,695Qantas Airways

Sun, 23 Aug - Sun, 30 Aug

18:13 - 06:55

BOS

SYD

22h 42m

1 stop

09:30 - 21:29

SYD

BOS

25h 59m

1 stop

$1,698United Airlines

Wed, 19 Aug - Wed, 26 Aug

09:20 - 06:55

BOS

SYD

31h 35m

1 stop

10:20 - 23:59

SYD

BOS

27h 39m

2 stops

$1,700United Airlines

Wed, 19 Aug - Wed, 9 Sep

10:40 - 08:20

BOS

SYD

30h 40m

3 stops

10:20 - 19:15

SYD

BOS

23h 55m

2 stops

$1,708Multiple Airlines

Sun, 18 Oct - Wed, 28 Oct

07:00 - 07:05

BOS

SYD

34h 05m

1 stop

09:10 - 23:44

SYD

BOS

28h 34m

1 stop

$1,716Qantas Airways

Sun, 9 Aug - Sun, 16 Aug

16:27 - 06:55

BOS

SYD

24h 28m

1 stop

12:00 - 21:05

SYD

BOS

23h 05m

1 stop

$1,721Qantas Airways

Sat, 15 Aug - Sun, 30 Aug

17:01 - 06:55

BOS

SYD

47h 54m

2 stops

10:20 - 23:59

SYD

BOS

27h 39m

2 stops

$1,723United Airlines

Sat, 15 Aug - Sun, 30 Aug

10:40 - 07:20

BOS

SYD

30h 40m

2 stops

10:20 - 09:50

SYD

BOS

38h 30m

2 stops

$1,724Air Canada

Wed, 16 Sep - Fri, 9 Oct

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Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets

Air Canada

16 Sept

BOS10:40Boston Logan Intl

30h 40m

2 stops

SYD07:20Sydney Kingsford Smith

9 Oct

SYD10:20Sydney Kingsford Smith

38h 30m

2 stops

BOS09:50Boston Logan Intl

$1,724

Air Canada

11 Sept

BOS10:40Boston Logan Intl

30h 40m

2 stops

SYD07:20Sydney Kingsford Smith

27 Sept

SYD09:20Sydney Kingsford Smith

38h 30m

2 stops

BOS09:50Boston Logan Intl

$1,726

Air Canada

16 Nov

BOS15:30Boston Logan Intl

26h 05m

2 stops

SYD09:35Sydney Kingsford Smith

12 Dec

SYD16:00Sydney Kingsford Smith

34h 17m

2 stops

BOS10:17Boston Logan Intl

$1,731

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

19 Aug

BOS18:13Boston Logan Intl

22h 42m

1 stop

SYD06:55Sydney Kingsford Smith

26 Aug

SYD09:30Sydney Kingsford Smith

25h 59m

1 stop

BOS21:29Boston Logan Intl

$1,698

United Airlines

19 Aug

BOS09:20Boston Logan Intl

31h 35m

1 stop

SYD06:55Sydney Kingsford Smith

9 Sept

SYD10:20Sydney Kingsford Smith

27h 39m

2 stops

BOS23:59Boston Logan Intl

$1,700

United Airlines

2 Aug

BOS18:36Boston Logan Intl

22h 24m

1 stop

SYD07:00Sydney Kingsford Smith

13 Sept

SYD09:30Sydney Kingsford Smith

34h 32m

2 stops

BOS06:02Boston Logan Intl

$1,705

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 19/8

10:30-07:05

1 stop30h 35m

Sydney Kingsford Smith

Wed 26/8

12:00-22:06

1 stop24h 06m

$1,693

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/8

15:19-06:55

2 stops25h 36m

Sydney Kingsford Smith

Tue 18/8

09:10-20:13

2 stops25h 03m

$1,694

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 23/8

10:30-07:05

1 stop30h 35m

Sydney Kingsford Smith

Sun 30/8

12:00-21:05

1 stop23h 05m

$1,695

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 19/8

18:13-06:55

1 stop22h 42m

Sydney Kingsford Smith

Wed 26/8

09:30-21:29

1 stop25h 59m

$1,698

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 19/8

09:20-06:55

1 stop31h 35m

Sydney Kingsford Smith

Wed 9/9

10:20-23:59

2 stops27h 39m

$1,700

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 18/10

10:40-08:20

3 stops30h 40m

Sydney Kingsford Smith

Wed 28/10

10:20-19:15

2 stops23h 55m

$1,708

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/8

07:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Sun 16/8

09:10-23:44

1 stop28h 34m

$1,716

Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

16:27-06:55

1 stop24h 28m

Sydney Kingsford Smith

Sun 30/8

12:00-21:05

1 stop23h 05m

$1,721

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 15/8

17:01-06:55

2 stops47h 54m

Sydney Kingsford Smith

Sun 30/8

10:20-23:59

2 stops27h 39m

$1,723

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 16/9

10:40-07:20

2 stops30h 40m

Sydney Kingsford Smith

Fri 9/10

10:20-09:50

2 stops38h 30m

$1,724

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 $1,865 to $2,352.
The lowest price recently found on this route was $1,693.

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 $1,746. 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 $1,839.

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 $2,086 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 $1,984 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 July 2026, prices for Boston to Sydney flights are approximately 72% 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	24h 06m
Direct flights	None

The fastest flight from Boston to Sydney takes 24h 06m

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 24h 06m 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 July 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 50% of the total bookings. Other popular airlines include United Airlines with 50%.

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 $1,405	Free cancellation	Rating 7.5 1,067 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,666	Free cancellation	Rating 7.4 10,025 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.