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

Air Canada and Asiana 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 March 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.

$646 Cheap Flights from Boston to Sydney in 2026

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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.

18:25 - 07:20

BOS

SYD

46h 55m

2 stops

09:20 - 22:38

SYD

BOS

51h 18m

2 stops

$1,643Air Canada

Fri, 12 Jun - Sun, 12 Jul

05:50 - 07:20

BOS

SYD

35h 30m

2 stops

09:20 - 16:08

SYD

BOS

44h 48m

2 stops

$1,647Air Canada

Thu, 11 Jun - Mon, 13 Jul

13:55 - 06:50

BOS

SYD

26h 55m

2 stops

09:15 - 22:20

SYD

BOS

27h 05m

2 stops

$1,649Delta

Sun, 9 Aug - Fri, 21 Aug

10:45 - 07:20

BOS

SYD

30h 35m

1 stop

09:20 - 09:59

SYD

BOS

38h 39m

2 stops

$1,650ANA

Tue, 7 Apr - Tue, 14 Apr

13:00 - 08:20

BOS

SYD

28h 20m

2 stops

09:20 - 09:49

SYD

BOS

38h 29m

2 stops

$1,655Air Canada

Tue, 31 Mar - Tue, 28 Apr

10:35 - 07:20

BOS

SYD

30h 45m

2 stops

09:20 - 09:50

SYD

BOS

38h 30m

2 stops

$1,656Air Canada

Mon, 8 Jun - Wed, 17 Jun

20:15 - 06:50

BOS

SYD

44h 35m

1 stop

09:15 - 23:58

SYD

BOS

28h 43m

1 stop

$1,659Delta

Sat, 8 Aug - Thu, 20 Aug

08:00 - 11:30

BOS

SYD

37h 30m

2 stops

09:10 - 16:35

SYD

BOS

21h 25m

1 stop

$1,660Qantas Airways

Wed, 15 Jul - Wed, 22 Jul

10:55 - 06:50

BOS

SYD

29h 55m

1 stop

09:15 - 23:58

SYD

BOS

28h 43m

1 stop

$1,662Delta

Tue, 21 Jul - Wed, 29 Jul

10:35 - 07:20

BOS

SYD

30h 45m

2 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,664Air Canada

Sat, 2 May - Sun, 17 May

Air New Zealand flights from Boston to Sydney

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

Air New Zealand

30 Aug

BOS12:30Boston Logan Intl

28h 50m

1 stop

SYD07:20Sydney Kingsford Smith

12 Sept

SYD09:20Sydney Kingsford Smith

38h 35m

2 stops

BOS09:55Boston Logan Intl

$1,695

Air New Zealand

14 Mar

BOS11:15Boston Logan Intl

29h 50m

1 stop

SYD08:05Sydney Kingsford Smith

22 Mar

SYD12:10Sydney Kingsford Smith

27h 39m

1 stop

BOS00:49Boston Logan Intl

$1,920

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets

Air Canada

12 June

BOS18:25Boston Logan Intl

46h 55m

2 stops

SYD07:20Sydney Kingsford Smith

12 July

SYD09:20Sydney Kingsford Smith

51h 18m

2 stops

BOS22:38Boston Logan Intl

$1,643

Air Canada

11 June

BOS05:50Boston Logan Intl

35h 30m

2 stops

SYD07:20Sydney Kingsford Smith

13 July

SYD09:20Sydney Kingsford Smith

44h 48m

2 stops

BOS16:08Boston Logan Intl

$1,647

Air Canada

3 Apr

BOS10:40Boston Logan Intl

54h 40m

2 stops

SYD08:20Sydney Kingsford Smith

20 Apr

SYD09:20Sydney Kingsford Smith

38h 39m

2 stops

BOS09:59Boston Logan Intl

$1,649

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 12/6

18:25-07:20

2 stops46h 55m

Sydney Kingsford Smith

Sun 12/7

09:20-22:38

2 stops51h 18m

$1,643

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 11/6

05:50-07:20

2 stops35h 30m

Sydney Kingsford Smith

Mon 13/7

09:20-16:08

2 stops44h 48m

$1,647

Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/8

13:55-06:50

2 stops26h 55m

Sydney Kingsford Smith

Fri 21/8

09:15-22:20

2 stops27h 05m

$1,649

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 7/4

10:45-07:20

1 stop30h 35m

Sydney Kingsford Smith

Tue 14/4

09:20-09:59

2 stops38h 39m

$1,650

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 31/3

13:00-08:20

2 stops28h 20m

Sydney Kingsford Smith

Tue 28/4

09:20-09:49

2 stops38h 29m

$1,655

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 8/6

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Wed 17/6

09:20-09:50

2 stops38h 30m

$1,656

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 8/8

20:15-06:50

1 stop44h 35m

Sydney Kingsford Smith

Thu 20/8

09:15-23:58

1 stop28h 43m

$1,659

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 15/7

08:00-11:30

2 stops37h 30m

Sydney Kingsford Smith

Wed 22/7

09:10-16:35

1 stop21h 25m

$1,660

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 21/7

10:55-06:50

1 stop29h 55m

Sydney Kingsford Smith

Wed 29/7

09:15-23:58

1 stop28h 43m

$1,662

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 2/5

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Sun 17/5

09:20-09:45

2 stops38h 25m

$1,664

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 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 $1,683. 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 $1,853.

How far in advance should I book a flight 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 $2,084 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 $1,790 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 37% 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 March 2026, prices for Boston to Sydney flights are approximately 3% 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	27h 24m
Direct flights	None

The fastest flight from Boston to Sydney takes 27h 24m

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

Search flight deals

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 27h 24m 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 March 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 61% of the total bookings. Other popular airlines include United Airlines with 39%.

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 $1,381	Free cancellation	Rating 7.5 1,003 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,638	Free cancellation	Rating 7.4 9,415 reviews		Search United Airlines flights

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Lithgow

Manly

Leura

Coogee

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.